TCH35P1500JE - Ohmite Manufacturing Co.

Ohmite Mfg. Co. 1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com

TCH35 Series

35 Watt TO220 Style

Thick Film Power Resistors

RoHS Compliant

0.390–0.410"

(9.91–10.41mm)

0.112–0.120"

(2.85–3.05mm)

ø0.139–0.148"

(3.55–3.75mm)

0.046–0.054"

(1.17–1.37mm)

0.027–0.034"

(0.70–0.86mm)

0.500–0.579"

(12.70–14.70mm)

0.190–0.210"

(4.83–5.33mm)

0.047–0.055"

(1.20–1.40mm)

0.230–0.250"

(5.85–6.35mm)

0.571–0.591"

(14.50–15.00mm)

0.157" max.

(5.00mm)

0.022–0.028"

(0.55–0.70mm)

0.159–0.190"

(4.06–4.82mm)

0.080–0.089"

(2.05–2.25mm)

Ohmite’s new TCH35 TO220

package resistor provides 35W

of steady state power when

properly used in today’s well

defined heat sink applications.

These very low induction

resistors are built under proprie-

tary processes that deliver 75%

more power handling capabil-

ity than other TO220 package

resistors of similar size.

Standard lead forms are

provided for manual or auto-

matic insertion.

A single screw mounting tab

connects to the heat sink and

should be accompanied by the

use of a thermal compound.

The TCH35 Series offers a low

thermal resistance to the heat

sink of <4.28°C/W.

FEATURES

• 35W Power Rating @ 25°C

• Very Low Inductance Design

• Single Screw Mounting

• Low Thermal Resistance to Heat

Sink @ RTH<4.28°C/W

• Resistance Element is Electrically

Insulated from Metal Heat Sink

Mounting Tab

APPLICATIONS

• Switching Power Supplies

• Snubbers

• High Frequency

• Voltage Regulation

• Low Energy Pulse Loading

SPECIFICATIONS

Electrical

Resistance Range: 0.1Ω to 10KΩ

(higher values on request subject

to derating)

Resistance Tolerance:

± 5% standard

± 1% available on request

Temperature Coefficient:

Referenced to 25°C,

ΔR taken at +105°C

10Ω and above: ±50 ppm°C

1Ω to10Ω:

±(100ppm +0.002Ω)/°C

Max. Operating Voltage: 350V

Dielectric Strength: 1800 VAC

Insulation Resistance: 10GΩ

min.

Momentary Overload: 2x rated

power for 5 seconds as long as

the applied voltage ≤1.5 times

the continuous operating voltage,

where ΔR ±(0.3% + 0.01Ω) max

Terminal Material: Copper

Terminal Plating: Lead Free

Solder (97% Tin, 3% Silver)

Maximum Torque: 0.9 Nm

Power Rating: 35 Watts @ 25°C

case temperature; see derating

curve, next page

Working Temperature Range:

-55°C to +175°C

Solder Process: The TCH35 can-

not exceed 260°C for more than

10 seconds during soldering

process.

PERFORMANCE DATA

Load Life MIL-R-39009, 2000 Hours @ Rated Pwr ΔR = ± (1.0% + 0.01) Ω

Thermal Shock MIL-R-STD-202, Method 107, Cond. F ΔR = ± (0.3% + 0.01) Ω max

High Freq Vibration MIL-R-STD-202, Method 204, Cond. D ΔR = ± (0.2% + 0.01) Ω max

Terminal Strength MIL-R-STD-202, Method 211, Cond. A ΔR = ± (0.2% + 0.01) Ω max

(Pull Test) 2.4N

Moisture Resistance MIL-R-STD-202, Method 106 ΔR = ± (0.5% + 0.01) Ω max

TAH20 Series

20 Watt TO220 Style

Thick Film Power Resistors

RoHS Compliant

0.400–0.420"

(10.15–10.67mm)

0.630–0.650"

(16.00–16.52mm)

0.450–0.550"

(11.43–13.97mm)

0.100–0.160"

(2.54–4.06mm)

0.045–0.055"

(1.14–1.40mm)

0.026–0.034"

(0.66–0.86mm)

0.190–0.210"

(4.82–5.34mm)

0.115–0.135"

(2.92–3.44mm)

0.016–0.024"

(0.40–0.60mm)

0.060–0.080"

(1.52–2.04mm)

The TAH20 is a completely

encapsulated thick film resistor

in the TO220 package outline.

Rated for 20 watts @ 25°C

case temperature, these resis-

tors are electrically isolated,

and molded in a high tempera-

ture case.

Designed for heat sink

mounting, the symmetrical

package is ready for use with

snap-on style heat sinks (we

recommend use of thermal

grease). The TAH20 Series is

very low induction, and avail-

able in a wide range of resis-

tance values in standard 5%

tolerance. 1% tolerance avail-

able by special order.

FEATURES

• 20 Watt Power Rating at 25°C

Case Temperature

• High Pulse Tolerant Design

• Quick-snap Molded Package

• Very Low Inductance Design

• Resistor Package Electrically

Isolated from Heat Sink

• Low Thermal Resistance to Heat

Sink @ RTH<6.25°C/W

• Tube Packaging Available

APPLICATIONS

• Frequency Conversion

• High Frequency Balancing

• Snubbers

SPECIFICATIONS

Electrical

Resistance Range: 0.05Ω to

10KΩ, other values available

upon request

Tolerance: ±5% std.

1% Available on request

Temperature Coefficient:

Referenced to 25°C,

ΔR taken at +105°C;

1 to 10Ω: ±(100ppm+0.002Ω)/°C

10Ω & up: ±50ppm/°C

Max Operating Voltage: 350V

Dielectric Strength: 1,800 VAC

Power Rating: 20W @ 25°C case

temperature; see derating curve,

Insulation Resistance:

10GΩ min.

Momentary Overload:

2x rated power for 5 seconds

where applied voltage ≤1.5 times

max. operating voltage. ΔR ±

(0.3% + 0.001Ω) max.

Terminal Material: Copper

Terminal Plating: Lead Free

Solder (97% Tin, 3% Silver)

Mounting: Requires the use of a

snap-on style heat sink. A ther-

mal compound should be prop-

erly applied.

Solder Process: The TAH20 can-

not exceed 260°C for more than

10 seconds during soldering

process.

PERFORMANCE DATA

Load Life MIL-R-39009, 2000 Hours @ Rated Pwr ΔR = ±(1.0% + 0.001) Ω

Thermal Shock MIL-R-STD-202, Method 107, Cond. F ΔR = ±(0.3% + 0.001) Ω max

High Freq Vibration MIL-R-STD-202, Method 204, Cond. D ΔR = ±(0.2% + 0.001) Ω max

Terminal Strength MIL-R-STD-202, Method 211, Cond. A ΔR = ±(0.2% + 0.001) Ω max

(Pull Test) 2.4N

Moisture Resistance MIL-R-STD-202, Method 106 ΔR = ±(0.5% + 0.01) Ω max

(continued on next page)

Ohmite Mfg. Co. 1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com

ORDERING INFORMATION

TAH20/TCH35 Series

20 Watt & 35 Watt TO220 Series

Thick Film Power Resistors

(continued)

DERATING CURVE PULSE-FORM

STANDARD VALUES

E24 standard values (+25 & 50), 1% and 5% tolerance

0.10 1.0 10 100 1,000 10,000

0.11 1.1 11 110 1,100

0.12 1.2 12 120 1,200

0.13 1.3 13 130 1,300

0.15 1.5 15 150 1,500

0.16 1.6 16 160 1,600

0.18 1.8 18 180 1,800

0.20 2.0 20 200 2,000 20,000

0.22 2.2 22 220 2,200

0.24 2.4 24 240 2,400

0.25 2.5 25 250 2,500

0.27 2.7 27 270 2,700

0.30 3.0 30 300 3,000

0.33 3.3 33 330 3,300

0.36 3.6 36 360 3,600

0.39 3.9 39 390 3,900

0.43 4.3 43 430 4,300

0.47 4.7 47 470 4,700

0.050 0.50 5.0 50 500 5,000

0.051 0.51 5.1 51 510 5,100

0.056 0.56 5.6 56 560 5,600

0.062 0.62 6.2 62 620 6,200

0.068 0.68 6.8 68 680 6,800

0.075 0.75 7.5 75 750 7,500

0.082 0.82 8.2 82 820 8,200

0.091 0.91 9.1 91 910 9,100

Consult factory for current stock disposition.

Ohm Value

Example:

2R40 = 2.4 Ohms

2K40 = 2400 Ohms

Tolerance

F = 1%

J = 5% Standard

Series

TCH35 = 35W

TAH20 = 20W

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Package Code

RoHS Compliant

Non-compliant

version not

recommended for

new designs

Energy (Ws)

Time, ms.

0.001 0.01 0.1 1 10 100 1,000 100,000

100

10,000

0.1

1,000

10,000

100,000

0.01

TCH35

TAH20

175

100

Percent Rated Power

Case Temperature, °C

0 50 100 15025 75 125

Rated Power, Watts

20/35

16/28

12/21

8/14

4/ 7

TAH/TCH

TCH

TAH

E-function, time between two pulses: 1 sec.