AP431ARA - Anachip Corporation - Datasheet.Directory

Adjustable Precision Shunt Regulator

AP431/AP431A

This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of

this product. No rights under any patent accompany the sale of the product.

Rev. A6 Feb.12, 2004

1/17



Features

• Precision reference voltage

AP431 : 2.495V ± 1%

AP431A : 2.495V ± 0.5%

• Sink current capability: 200mA

• Minimum cathode current for regulation: 300μA

• Equivalent full-range temp coefficient: 30 ppm/oC

• Fast turn-on response

• Low dynamic output impedance: 0.2Ω

• Programmable output voltage to 36v

• Low output noise.

• Packages: TO92, SOT89, SOT23, SOT25 and

SOP



Description

The AP431/AP431A are 3-terminal adjustable

precision shunt regulators with guaranteed

temperature stability over the applicable extended

commercial temperature range. The output voltage

may be set at any level greater than 2.495V(VREF)

up to 36V merely by selecting two external resistors

that act as a voltage divider network. These devices

have a typical output impedance of 0.2Ω. Active

output circuitry provides very sharp turn-on

characteristics, making these devices excellent

improved replacements for Zener diodes in many

applications.

The precise (+/-) 1% Reference voltage tolerance of

the AP431/431A make it possible in many

applications to avoid the use of a variable resistor,

consequently saving cost and eliminating drift and

reliability problems associated with it.



Ordering Information

A P 4 3 1 X X X X X

Package Packing

Blank : Tube or bulk

A : Taping

Reference Voltage

Tolerance:

Blank : +/- 1%

A : +/- 0.5%

Operating Temp. Range

Blank : SOP-8L

Y : SOT89-3L

V : TO92-3L

W : SOT23-3L

R : SOT23-3L

Q : SOT25

Blank : -20

o

C~85

o

C

I : -40

o

C~85

o

C

Lead Free

Blank : Normal

L : Lead Free Package



Typical Application Circuit

+

R2

R1

V

OUT

V

IN

V

OUT

= (1+R1/R2)V

REF

Precision Regulator

C

in

C

out

AP431

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

2/17



Block Diagram

REF (R)

VREF

+

-

Anode (A)

C



Symbol

Cathode (C)

REF (R)

Anode (A)



Pin Configuration

Order Number Pin Configuration (Top View)

AP431Y

AP431 AY

AP431IY

AP431IAY

(SOT89)

AP431V

AP431 AV

AP431IV

AP431IAV

(TO92)

Order Number

AP431R

AP431AR

AP431IR

AP431IAR

(SOT23)

AP431W

AP431AW

AP431IW

AP431IAW

(SOT23)

1 REF

2 Anode

3 Cathode

1 REF

2 Anode

+

3 Cathode

Anode 1

2 Cathode

3 REF

Anode 1

2 REF

3 Cathode

Cathode 1

Anode 2

Anode 3

NC 4 5 NC

6 Anode

7 Anode

8 REF

AP431

AP431A

AP431I

AP431IA

(SOP)

Pin Configuration (Top View)

AP431 Q

AP431 AQ

AP431IQ

AP431IAQ

(SOT25)

NC 1

4 REF

NC 2

Cathode 3

5 Anode

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

3/17



Marking Information

(1) SOT23 / SOT25 / SOT89

P/N Type X X

AP431Y A 4

AP431AY A 5

AP431IY A A

AP431IAY A B

AP431W A 6

AP431AW A 7

AP431IW A C

AP431IAW A D

AP431R A 8

AP431AR A 9

AP431IR A E

AP431IAR A F

AP431Q A 2

AP431AQ A 3

AP431IQ A G

AP431IAQ A H

XX YM X

SOT23/SOT25

XX

YMX

SOT89

Date code

Y :Year

M : Month(A~L)

XX: P/N Type

(Top View)

X: Blank : normal

L : Lead Free Package

(2) SOP

Accuracy

AC

AP431X X

YYWW X

Blank:

A :

Logo

( Top view )

%1495.2 ±

%5.0495.2 ±

Blank: -20oC ~ +85oC

I : -40oC ~ +85oC

YY : Year

WW: Nth week

Date code

Temp. grade

Lead Free

Blank: normal

L: Lead Free Package

(3)TO92

Accuracy

AP431X

X YWW X X

Blank:

A :

( Top view )

Y : Year

WW: Nth week

Date code Internal code

Temp. grade

1%2.495 ±

0.5%2.495 ±

Blank: -20

o

C ~ +85

o

C

I : -40

o

C ~ +85

o

C

Blank: normal

L: Lead Free Package

Lead Free

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

4/17



Absolute Maximum Ratings

Cathode Voltage ………………………………......…..............................……………………………...……….36V

Continuous Cathode Current ………………………….……...............................…………….... -10mA ~ 250mA

Reference Input Current Range ……………..………..............……..............................………….…....... 10mA

Operating Temperature Range (AP431)…………..…….…….....………………...........………........ -20oC ~

85oC

(AP431I).……………….….............…………………………....…….. -40oC ~ 85oC

Lead Temperature………………………….………….…….…………....…………………….........…............ 260oC

Storage Temperature ……………………………......…....….............………………..……............ -65oC ~ 150oC

Power Dissipation (Notes 1. 2) SOT89 Package .…………......……………………….............….... 0. 80W

TO92 Package ….…………..………………………....……….....… 0.78W

SOT23 package .……………..…………….......………………….…. 0.23W

SOT25 Package……………….……...…………….…………………..0.23W

SOP Package………………..………………………………..……… 0.6W

Note 1: TJ, max =150oC

Note 2: Ratings apply to ambient temperature at 25oC



Electrical Characteristics (Ta=25oC , unless otherwise specified.)

PARAMETER TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT

AP431 2.470 2.495 2.520

Reference voltage VKA = VREF,

I KA = 10mA (Fig.1) AP431A VREF 2.482 2.507

V

Deviation of Reference input voltage

over temperature (Note 3)

VKA = VREF, IKA = 10mA,

Ta = Full range (Fig.1) VREF 8.0 20 mV

VKA = 10V

~VREF ∆VREF -1.4 -2.0 mV/V

Ratio of the change in Reference

voltage to the change in Cathode

voltage

IKA = 10mA (Fig.2)

VKA= 36V ~10V ∆VKA -1 -2 mV/V

Reference input current R1 = 10KΩ,R2 = ∞ IKA= 10mA

(Fig.2) IREF 1.4 3.5 µA

Deviation of Reference input current

over temperature

R1 = 10KΩ,R2 = ∞ IKA = 10mA

Ta = Full range (Fig.2) αIREF 0.4 1.2 µA

Minimum Cathode current for

regulation VKA = VREF (Fig.1) IKA(MIN) 0.19 0.5 mA

Off-state current VKA = 36V, VREF = 0V (Fig.3) IKA(OFF) 0.1 1.0 µA

Dynamic output impedance (Note 4)

V KA = VREF V KA = VREF

∆IKA = 0.1mA ~ 15mA

Frequency ≤ 1KHz (Fig.1)

KA

Z 0.2 0.5 Ω

V

MAX

V

MIN

T

I

T

2

TEMPERATURE

V

DEV

= V

MAX

- V

MIN

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

5/17

Note 3. Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference over

the full temperature range.

The average temperature coefficient of the reference input voltage αVREF is defined as:

12

6

REF

DEV

REF TT

10)

C)(25V

V

(

V−

⋅

°

=α ……………………..……………….. ( )

C

ppm

°

Where:

T2 – T1 = full temperature change.

αVREF can be positive or negative depending on whether the slope is positive or negative.

Note 4. The dynamic output impedance, RZ, is defined as:

KA

KA I

V

Z∆

∆

=

When the device is programmed with two external resistors R1 and R2 (see Figure 2.), the dynamic output

impedance of the overall circuit, is defined as:

)

R2

R1

(1Z

i

v

ZKA

'

KA +

∆

=≈



Test Circuits

Input

VREF

V

KA

I

KA

Fig1. Test Circuit for V

KA

= V

REF

IN

VREF

R1

R2

IREF

Note:VKA=VREF(1+R1/R2)+IREF

×

R1

I

KA

V

KA

Fig2. Test circuit for V

KA

＞V

REF

IN

V

KA

IZ(OFF)

Fig3. Test Circuit for off-state Current

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

6/17



Typical Performance Characteristics

Cathode current Vs Cathode Voltage

-100

0

100

-1.5 -0.5 0.5 1.5 2.5

Cathode Voltage(v)

Cathode current(mA)

V

KA

=Vref

Ta=25

o

C

Cathode current (uA) Vs Cathode Voltage

-1

Cathode Voltage(v)

Cathode current(uA)

-200

200

400

600

0

-0.5 0 0.5 11.5 2 2.5

V

KA

=Vref

Ta=25

o

C

Reference Voltage Vs Free-Air Temperature

Free-Air Tempeture (

o

C)

Reference Voltage(mV)

2480

2485

2490

2495

2500

-40 80-30 -20 -10 0 10 20 30 40 50 60 70

Reference input current Vs free Temperature

Free-Air Temperature(

o

C)

Reference input current (uA)

1

1.2

1.4

1.6

1.8

2

-50 -25 0 25 50 75 100 125

R1=10K

I

KA

=10mA

Change in Reference Voltage vs Cathode Voltage

0 5 10 15 20 25 30

Cathode Volta

g

e

(

V

)

Change in Reference Voltage (mv)

-12

-10

-8

-6

-4

-2

0

I

KA

=10mA

Ta=25

o

C

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

7/17



Typical Performance Characteristics(Continued)

+

-

+

-

Output

GND

15K

Ω

8.25K

Ω

9

μ

F

I

KA

232

Ω

TEST CIRCUIT FOR VOLTAGE AMPLIFICATION

SMALL-SIGNAL VOLTAGE AMPLIFICATION vs. FREQUENCY

0

10

20

30

40

50

60

1K 10K 100K 1M 10M

f-Frequency-Hz

AV-Small Signal Voltage Amplification (dB)

I

KA

=10mA

T

A

=25

o

C

+

-

IKA

GND

Output

1K

Ω

50

Ω

TEST CIRCUIT FOR REFERENCE IMPEDANCE

REFERENCE IMPEDANCE vs. FREQUENCY

0.1

1

10

100

1K 10K 100K 1M 10M

f-Frequency-Hz

∣ZKA∣—Reference Impedance —Ω

I

KA

=10mA

T

A

=25

o

C

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

8/17

PULSE RESPONSE

0

1

2

3

4

5

6

-101234567

t-Time-

μ

S

Input and Output Voltage-V

Input

Output

GND

Output

220

Ω

50

Ω

TEST CIRCUIT FOR PULSE RESPONSE

Pulse

Generator

f=100kHz

T

A

=25

o

C

+

-

150

Ω

IKA

V

BATT

C

L

TEST CIRCUIT FOR CURVE A

+

-

C

L

R1=10K

Ω

R2

IKA

150

Ω

V

BATT

TEST CIRCUIT FOR CURVE B, C, AND D

The areas under the curves represent conditions that may cause the

device to oscillate. For curves B, C, and D, R2 and V+ were adjusted

to establish the initial V

KA

and I

KA

conditions with C

L

=0.V

BATT

and

C

L

were then adjusted to determine the ranges of stability.

STABILITY BOUNDARY CONDITIONS†

0

10

20

30

40

50

60

70

80

90

100

0.001 0.01 0.1 1 10

CL-Load Capacitance-µF

IKA-Cathode Current-mA

A VKA=Vref

B VKA=5V

C V

KA=10V

D V

KA=15V

A

B

C

D

Stable

TA=25oC

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

9/17



Application Examples

V

IN

+

Low Limit V

REF

(1 + R1B/R2B) +V

BE

High Limit V

REF

(1 + R1A/R2A)

R1A R1B

R2A R2B V

BE

Output ON when

Low Limint < V

IN

< High Limit

Fig.10 Over-Voltage / Under-Voltage Protection Circuit

V

IN

R

CL

I

OUT

I

OUT

= V

REF

/ R

CL

Fig.6 Current Limiter or Current Source

I

OUT

V

IN

I

OUT

= V

REF

/ R

S

R

S

Fig.7 Constant-Current Sink

Fig.4 Voltage Monitor Fig.5 Delay Timer

V

OUT

= (1 + R1/R2) x V

REF

V

IN

R1

R2

Fig.8 Higher-Current Shunt Regulator

V

OUT

V

IN

PUSE

R1

R2

L

IMIT

(1 + R1/R2) x V

REF

Fig.9 Crow Bar

V

OUT

V

IN

ON

OFF

R

+

V

IN

Delay = RC x ln( V

IN

-V

REF

)

LED on when Low Limit＜V

IN

＜High Limit

Low Limit

≈

V

REF

(1+R1B/R2B)

High Limit

≈

V

REF

(1+R1A/R2A)

R1A

R2A

V

IN

R1B

R2B

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

10/17



Package Diagrams

(1) SOT89-3L Package Outline Dimension

c

5

0

(2x)

L

HE

E

D1

e1

e

A

D

b1

bb

8

0

(2x)

Dimensions In Millimeters Dimensions In Inches

Symbol Min. Nom. Max. Min. Nom. Max.

A 1.40 1.50 1.60 0.055 0.059 0.063

b 0.36 0.42 0.48 0.014 0.016 0.018

b1 0.41 0.47 0.53 0.016 0.043 0.051

C 0.35 0.39 0.43 0.014 0.015 0.017

D 4.40 4.50 4.60 0.173 0.177 0.181

D1 1.40 1.60 1.75 0.055 0.062 0.069

e 2.90 3.00 3.10 0.114 0.118 0.122

e1 1.45 1.50 1.55 0.057 0.059 0.061

E 2.40 2.50 2.60 0.094 0.098 0.102

HE 3.94 - 4.25 0.155 - 0.167

L 0.80 - 1.20 0.031 - 0.047

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

11/17

(2) TO92-3L Package Outline Dimension

Db

b

1

b

EL

e

A

1

A

Dimensions In Millimeters Dimensions In Inches

Symbol Min. Nom. Max. Min. Nom. Max.

A 3.302 3.556 3.810 0.130 0.140 0.150

A1 1.016 - - 0.040 - -

b 0.330 0.381 0.432 0.013 0.015 0.017

b1 0.406 0.457 0.506 0.016 0.018 0.020

D 4.445 4.572 4.699 0.175 0.180 0.185

E 4.445 4.572 4.699 0.175 0.180 0.185

L 13.00 - 15.500 0.512 - 0.610

e 1.150 1.270 1.390 0.045 0.050 0.055

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

12/17

(3) SOT23-5L Package Outline Dimension

θ

Gauge Plane

0.25 mm

L

L1

E1 E

e1

D

123

4

5

b

e

b1

b

CC1

Base

Metal

With

Plating

A2

A1

A

Seating Plane

0.10 C

5x

2(4x)

θ

1(4x)

θ

Dimensions In Millimeters Dimensions In Inches

Symbol Min. Nom. Max. Min. Nom. Max.

A 1.05 1.20 1.35 0.041 0.047 0.053

A1 0.05 0.10 0.15 0.002 0.004 0.006

A2 1.00 1.10 1.20 0.039 0.043 0.047

b 0.25 - 0.55 0.010 - 0.022

b1 0.25 0.40 0.45 0.010 0.016 0.018

c 0.08 - 0.20 0.003 - 0.008

c1 0.08 0.11 0.15 0.003 0.004 0.006

D 2.70 2.85 3.00 0.106 0.112 0.118

E 2.60 2.80 3.00 0.102 0.110 0.118

E1 1.50 1.60 1.70 0.059 0.063 0.067

L 0.35 0.45 0.55 0.014 0.018 0.022

L1 0.60 Ref. 0.024 Ref.

e 0.95 Bsc. 0.037 Bsc.

e1 1.90 Bsc. 0.075 Bsc.

θ 0o 5

o 10o 0

o 5

o 10o

θ1 3o 5

o 7

o 3

o 5

o 7

o

θ2 6o 8

o 10o 6

o 8

o 10o

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

13/17

(4) SOT23-3L Package Outline Dimension

C

L

e

E

HE

2

13

D

A2

A1

b

A

Dimensions In Millimeters Dimensions In Inches

Symbol Min. Nom. Max. Min. Nom. Max.

A 1.00 1.20 1.40 0.039 0.047 0.055

A1 0.00 - 0.10 0.000 - 0.004

A2 1.00 1.15 1.30 0.039 0.045 0.051

b 0.35 - 0.50 0.014 - 0.020

C 0.10 0.175 0.25 0.004 0.007 0.010

D 2.70 2.90 3.10 0.106 0.114 0.122

E 1.40 1.60 1.80 0.055 0.063 0.071

e 1.70 2.00 2.30 0.067 0.079 0.091

HE 2.40 2.70 3.00 0.094 0.106 0.118

L 0.35 0.45 0.55 0.014 0.018 0.022

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

14/17

(5) SOP-8L Package Outline Dimension

VIEW "A"

L

C

VIEW "A"

H

E

A

A2

A1

B

e

D

7(4X) 0.015x45 7(4X)

y

Dimensions In Millimeters Dimensions In Inches

Symbol Min. Nom. Max. Min. Nom. Max.

A 1.40 1.60 1.75 0.055 0.063 0.069

A1 0.10 - 0.25 0.040 - 0.100

A2 1.30 1.45 1.50 0.051 0.057 0.059

B 0.33 0.41 0.51 0.013 0.016 0.020

C 0.19 0.20 0.25 0.0075 0.008 0.010

D 4.80 5.05 5.30 0.189 0.199 0.209

E 3.70 3.90 4.10 0.146 0.154 0.161

e - 1.27 - - 0.050 -

H 5.79 5.99 6.20 0.228 0.236 0.244

L 0.38 0.71 1.27 0.015 0.028 0.050

y - - 0.10 - - 0.004

θ 0O - 8O 0

O - 8O

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

15/17



Taping Information

(1)TO92 TAPING

Po

M

Ho

T

F2 F1

Do

A

Δ

h

Millimeters Inches

Symbol Min. Typ. Max. Min. Typ. Max.

Po 12.4 12.7 13.0 0.488 0.500 0.512

M 2.0 2.5 3.0 0.079 0.098 0.118

Ho 15.5 16.0 16.5 0.610 0.630 0.650

Do - 4.0 - - 0.157 -

A - 6.0 - - 0.236 -

Δh 0.0 - 1.0 0.000 - 0.039

T - 18.0 - - 0.709 -

F1 2.4 2.5 2.9 0.094 0.098 0.114

F2 2.4 2.5 2.9 0.094 0.098 0.114

30

±

1mm

90

±

1mm

76

±

1mm

360

±

2mm

45mm

53

±

2mm

E

330mm

40mm

205mm

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

16/17

(2)TO92 TAPING

H2A H2A

D1

F1

F2

P1

P

P2

D

LL1

A

D2

H1

H4

H3

H

W1

W

H2 H2

T2

T

T1

Millimeters Inches

Symbol Min. Typ. Max. Min. Typ. Max.

A 3.18 7.59 12 0.125 0.299 0.472

D 3.8 4 4.2 0.150 0.157 0.165

D1 0.36 0.445 0.53 0.014 0.018 0.021

D2 - - 9.0 - - 0.354

F1,F2 2.4 2.5 2.7 0.094 0.098 0.106

F1-F2 - 0.30 - - ±0.012 -

H 15.5 16 16.5 0.610 0.630 0.650

H1 8.5 9 9.5 0.335 0.354 0.374

H2 - - 0.5 - - 0.020

H2A - - 0.5 - - 0.020

H3 - - 27 - - 1.063

H4 - - 20 - - 0.787

L - - 11 - - 0.433

L1 2.5 - - 0.098 - -

P 12.5 12.7 12.9 0.492 0.500 0.508

P1 5.95 6.35 6.75 0.234 0.250 0.266

P2 50.3 50.8 51.3 1.980 2.000 2.020

T - - 0.55 - - 0.022

T1 - - 1.42 - - 0.056

T2 0.36 0.52 0.68 0.014 0.020 0.027

W 17.5 18.25 19 0.689 0.719 0.748

W1 5 6 7 0.197 0.236 0.276

----* 253 254 255 9.961 10.000 10.039

----* = every 20 pcs distance.

Adjustable Precision Shunt Regulator

AP431/AP431A

Anachip Corp.

www.anachip.com.tw Rev. A6 Feb.12, 2004

17/17



BOX Dimension

53

195 4040

70

19540

197 40.540.5

41 330

24

556

811.5

330

37.5

6

43

4.68

18.18 16.67

18.68

38.5

39.5

unit:mm.