TL431C, TL431AC, TL431I, TL431AI, TL431M, TL431Y
ADJUSTABLE PRECISION SHUNT REGULATORS
SLVS005I – JULY 1978 – REVISED AUGUST 1998
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating conditions, TA = 25°C (unless otherwise
noted)
TEST TL431I
PARAMETER CIRCUIT TEST CONDITIONS MIN TYP MAX UNIT
Vref Reference voltage 2 VKA = V ref, IKA = 10 mA 2440 2495 2550 mV
VI(dev) Deviation of reference voltage
over full temperature range
(see Figure 1) 2VKA = V ref, IKA = 10 mA,
TA = Full range†5 50 mV
D
VRatio of change in reference voltage ∆VKA = 10 V – Vref –1.4 –2.7
ref
D
VKA to the change in cathode voltage 3IKA = 10 mA ∆VKA = 36 V – 10 V –1 –2 mV
V
Iref Reference current 3 IKA = 10 mA, R1 = 10 kΩ, R2 = ∞2 4 µA
II(dev) Deviation of reference current
over full temperature range
(see Figure 1) 3IKA = 10 mA, R1 = 10 kΩ, R2 = ∞,
TA = Full range†0.8 2.5 µA
Imin Minimum cathode current for
regulation 2 VKA = V ref 0.4 1 mA
Ioff Of f-state cathode current 4 VKA = 36 V, Vref = 0 0.1 1 µA
|zKA|Dynamic impedance (see Figure 1) 2IKA = 1 mA to 100 mA, VKA = Vref,
f ≤ 1 kHz 0.2 0.5 Ω
†Full temperature range is –40°C to 85°C for the TL431I.
electrical characteristics over recommended operating conditions, TA = 25°C (unless otherwise
noted)
TEST TL431M
PARAMETER CIRCUIT TEST CONDITIONS MIN TYP MAX UNIT
Vref Reference voltage 2 VKA = V ref, IKA = 10 mA 2400 2495 2600 mV
VI(dev) Deviation of reference voltage
over full temperature range
(see Figure 1) 2VKA = V ref, IKA = 10 mA,
TA = Full range†22 mV
D
VRatio of change in reference voltage ∆VKA = 10 V – Vref –1.4 –3
ref
D
VKA to the change in cathode voltage 3IKA = 10 mA ∆VKA = 36 V – 10 V –1 –2.3 mV
V
Iref Reference current 3 IKA = 10 mA, R1 = 10 kΩ, R2 = ∞2 8* µA
II(dev) Deviation of reference current
over full temperature range
(see Figure 1) 3IKA = 10 mA, R1 = 10 kΩ, R2 = ∞,
TA = Full range‡1µA
Imin Minimum cathode current
for regulation 2 VKA = V ref 0.4 1.5 mA
Ioff Of f-state cathode current 4 VKA = 36 V, Vref = 0 0.1 3 µA
|zKA|Dynamic impedance (see Figure 1) 1IKA = 1 mA to 100 mA, VKA = Vref,
f ≤ 1 kHz 0.2 0.9* Ω
* On products compliant to MIL-PRF-38535, this parameter is not production tested.
‡Full temperature range is –55°C to 125°C for the TL431M.