ZTL431AH6TA - Diodes [Zetex]

ZTL431/ZTL432

Document number: DS33263 Rev. 15 - 2 1 of 9

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COST EFFECTIVE ADJUSTABLE PRECISION SHUNT REGULATOR

Description

The ZTL431 and ZTL432 are three terminal adjustable

shunt regulators offering excellent temperature stabilit y and

output current handling capability up to 100mA. The output

voltage may be set to an y chosen voltage between 2.5 and

20 volts by selection of two external divider resistors.

The devices can be used as a replacement for zener

diodes in many applications requiring an improvement in

zener performance.

The ZTL432 has the same electrical specifications as the

ZTL431 but has a different pin out in SOT23 (F-suffix) and

SOT23F (FF-suffix).

Both variants are available in 2 grades with initial

tolerances of 1% and 0.5% for the A and B grades

respectively.

These are functionally equivalent to the TL431/ TL432

except for maximum operation voltage, and have an

ambient temperature range of -40 to 125°C as standard.

Pin Assignments

ZTL431_F SOT23, ZTL431_FF SOT23F

(Top View)

ZTL432_F SOT23, ZTL432_FF SOT23F

(Top View)

ZTL431_H6, SC70-6

(Top View)

†Connected internally to substrate;

should be left floating or connected to Anode

ZTL431ASE5 SOT235

(Top View)

ZTL431_E5 SOT235

(Top View)

*must be left floating or

connected to pin 5

Features

• Temperature range ................ -40 to 125°C

• Reference voltage tolerance at 25°C

o 0.5%.......................................B grade

o 1% .........................................A grade

• 0.2Ω typical output impedance

• Sink current capability…….. 1mA to 100mA

• Adjustable output voltage……VREF to 20V

Applications

• Opto-coupler linearization

• Linear regulators

• Improved zener

• Variable reference

Anode

Cathode

Ref

2

1

3

Anode

Cathode

Ref

2

1

3

Anode

Cathode

Ref

2

1

3

Cathode

Ref

N/C

†

N/C

†

NC

Anode

3

2

1

4

5

6

Cathode

2

Anode

Cathode

N/C

3

15

4

Ref

N/C

2

Anode

Cathode

N/C

3

15

4

Ref

N/C*

ZTL431/ZTL432

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Absolute Maximum Ratings (Voltages specified are relative to the ANODE pin unless otherwise stated)

Paramete

r

Rating Unit

Cathode Voltage (VK

A

) 20 V

Continuous Cathode Current (IKA) 150 mA

Reference Input Current Range (IREF) -50µA to 10mA

Operating Junction Temperatu r e -40 to 150 °C

Storage Temperature -55 to 150 °C

Operation above the absolute maximum rating may cause device failure.

Operation at the absolute maximum ratings, for extended periods, may reduce device reliability.

Package Thermal Data

Package θJA PDIS

T

A

= 25°C, TJ = 150°C

SOT23 380°C/W 330 mW

SOT23F 138°C/W 900 mW

SOT23-5 250°C/W 500 mW

SOT70-6 380°C/W 330mW

Recommended Operating Conditions

Min Max Units

VKA Cathode Voltage VREF 20 V

IKA Cathode Current 1 100 mA

TA Operating Ambient Temperature Range -40 125 °C

Electrical Characteristics (Test conditions unless otherwise specified: TA = 25°C)

Symbol Paramete

r

Conditions Min. Typ. Max. Units

VREF Reference voltage VKA = VREF

IKA = 10mA ZTL43_A 2.475 2.5 2.525 V

ZTL43_B 2.487 2.5 2.513

VDEV Deviation of referenc e

voltage over full

temperature range

VKA = VREF

IKA = 10 mA

TA = 0 to 70° 6 16

mV

TA = -40 to 85°C 14 34

TA = -40 to 125°C 14 34

ΔVREF

ΔVKA

Ratio of change in

reference voltage

to the change in

cathode voltage

IKA = 10mA

VKA = VREF to 10 -1.4 -2.7

mV/V

VKA = 10V to 20V -1.0 -2.0

IREF Reference input current IKA = 10mA, R1 = 10k

R2 = OC 2 4 µA

ΔIREF

IREF deviation over full

temperature range

IKA = 10mA

R1 = 10k

R2 = OC

TA = 0 to 70°C 0.8 1.2

µA

TA = -40 to 85°C 0.8 2.5

TA = -40 to 125°C 0.8 2.5

I

KA(MIN)

Minimum cathode

current for regulation VKA = VREF 0.4 0.6 mA

IKA

(

OFF

)

Off state current VKA = 20V, VREF = 0V 0.1 0.5 µA

RZ Dynamic output

impedance VKA = VREF, f = 0Hz 0.2 0.5 

ZTL431/ZTL432

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Typical Characteristics

I

KA

=10mA

V

REF

=V

KA

0

100

200

300

400

500

600

700

800

900

1000

0 255075100125

SOT23-5

SOT23

SC70-6

SOT23F

Ambient Temperature (°C)

Power Dissipation (

m

W)

Reference Voltage vs. Temperature

Dynamic Impedance vs. Frequency

Power Dissipation Derating

ZTL431/ZTL432

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Typical Characteristics (Cont.)

I

KA

I

KA

I

KA

V

KA

V

KA

V

REF

<V

KA

<20,I

KA

=10mA,T

A

=25°C

V

KA

V

KA

Stability Boundary Condition

0

10

20

30

40

50

60

70

80

90

100

10.0E-12 100.0E-12 1.0E-9 10.0E-9 100.0E-9 1.0E-6

Load Capacitance (F)

Cathode Current (mA)

Gain vs. Frequency

0

10

20

30

40

50

60

100 1000 10000 100000 1000000

Frequency (Hz)

Gain (dB)

Stable

a

b

e

Stable

Pulse Response

Test Circuit for Stabilty Boundary Conditions

Test Circuit for Pulse Response

Test Circuit for Open Loop Voltage Gain

ZTL431/ZTL432

Document number: DS33263 Rev. 15 - 2 5 of 9

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Application Circuits

V

ON

~2V

V

OFF

=V

+

V

TH

=2.5V

Output

V+

Input

R1

R2

V

OUT

V

OUT

V+

V

REF

V

REF

R1

R2

V

OUT

V

OUT

V+

V

REF

V

REF

R1

R2

V

OUT

V

OUT

V+

V

REF

V

REF

V

OUT(MIN)

=V

REF

+V

REG

In Out

Common

ZSR***

0.01µF

30

R1

R2

V

REF

V+

V

OUT

V

OUT

V

REF

R1 R1

R2b

R2a

V

REF

V

REF

V

REF

V

REF

V+

Outpu

t

Shunt regulator

Output control of a three

terminal fixed regulator

Single supply comparator

with temperature

compensated threshold

Higher current shunt

regulator

Series regulator

Over voltage / under voltage

protection circuit

ZTL431/ZTL432

Document number: DS33263 Rev. 15 - 2 6 of 9

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DC Test Circuits

Notes

Deviation of reference in put voltage, Vdev, is defined as

the maximum variation of the reference input voltage

over the full temperature range.

The average temperature coefficient of the reference

input voltage, Vref is defined as:

VREF(ppm/°C) = VDEV × 1,000,000

VREF(T1-T2)

The dynamic output impedance, Rz, is defined as:

RZ = VZ

IZ

When the device is programmed with two external

resistors, R1 and R2, (fig 2), the dynamic output

impedance of the overall circ uit, R'z, is defined as:

R'Z = RZ (1 + R1 )

R2

Stability Boundary

The ZTL431 and ZTL432 are stable with a range of

capacitive loads. A zone of instability exists as

demonstrated in the typical characteristic gr a ph on page

4. The graph shows typical conditions. To ensure

reliable stability a capacitor of 4.7nF or greater is

recommended between anode and cathode.

ZTL431/ZTL432

Document number: DS33263 Rev. 15 - 2 7 of 9

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Ordering Information

Tol. Ordering Code Pack Part Mark Status* Reel Size Tape Width

(mm) Quantity

per Reel

1%

ZTL431AE5TA SOT23-5 31A Active 7”, 180mm 8 3000

ZTL431AFFTA SOT23F 31A Active 7”, 180mm 8 3000

ZTL431AFTA SOT23 31A Active 7”, 180mm 8 3000

ZTL431AH6TA SC70-6 31A Active 7”, 180mm 8 3000

ZTL431ASE5TA SOT23-5 S2A Active 7”, 180mm 8 3000

ZTL432AFFTA SOT23F 32A Active 7”, 180mm 8 3000

ZTL432AFTA SOT23 32A Active 7”, 180mm 8 3000

0.5%

ZTL431BE5TA SOT23-5 31B Active 7”, 180mm 8 3000

ZTL431BFFTA SOT23F 31B Active 7”, 180mm 8 3000

ZTL431BFTA SOT23 31B Active 7”, 180mm 8 3000

ZTL431BH6TA SC70-6 31B Active 7”, 180mm 8 3000

ZTL432BFFTA SOT23F 32B Active 7”, 180mm 8 3000

ZTL432BFTA SOT23 32B Active 7”, 180mm 8 3000

Package Outline Dimensions

SOT23

E

e

L

e1

D

A

c

E1

L1

A1

b

3leads

Dim. Millimeters Inches Dim. Millimeters Inches

Min. Max. Min. Max. Min. Max. Max. Max.

A - 1.12 - 0.044 e1 1.90 NOM 0.075 NOM

A1 0.01 0.10

0.0004

0.004 E 2.10 2.64 0.083 0.104

b 0.30 0.50 0.012 0.020 E1 1.20 1.40 0.047 0.055

C 0.085

0.120

0.003 0.008 L 0.25 0.62 0.018 0.024

D 2.80 3.04

0.110

0.120 L1 0.45 0.62 0.018 0.024

e 0.95 NOM 0.0375 NOM - - - - -

Note: Controlling dimensions are in millimeters.

Approximate dimensions are provided in inches

SC70-6

a

Dim. Millimeters Inches Dim. Millimeters Inches

Min. Max. Min. Max. Min. Max. Max. Max.

A

0.80 1.10 0.0315 0.0433

E

2.10 BSC

0.0826 BSC

A1

-

0.10 -

0.0039

E1

1.25

1.35 0.0492 0.0531

A2

0.80 1.00 0.0315 0.0394

e

0.65 BSC

0.0255 BSC

b

0.15 0.30 0.006 0.0118

e1

1.30 BSC

0.0511 BSC

C

0.08 0.25 0.0031 0.0098

L

0.26

0.46 0.0102 0.0181

D 2.00 BSC 0.0787 BSC a 0° 8° 0° 8°

Note: Controlling dimensions are in millimeters.

Approximate dimensions are provided in inches

ZTL431/ZTL432

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Package Outline Dimensions (continued)

SOT23F

D

L1

c

A1

b

R

bb

E1 E

e1

e

L

A

Dim. Millimeters Inches Dim. Millimeters Inches

Min. Max. Min. Max. Min. Max. Max. Max.

A 0.80 1.00 0.031 0.0394 E 2.30 2.50 0.0906 0.0984

A1 - 0.10 0.00 0.0043 E1 1.50 1.70 0.0590 0.0669

A2 0.06 0.16

0.0024

0.0006 E2 1.10 1.26 0.0433 0.0496

b 0.39 0.41

0.0153

0.0161 L 0.48 0.68 0.0189 0.0268

c 0.11 0.20

0.0043

0.0079 L1 0.39 0.41 0.0153 0.0161

D 2.80 3.00

0.1102

0.1181 R 0.05 0.15 0.0019 0.0059

e 0.95 ref 0.0374 ref O 0° 12° 0° 12°

e1 1.90 ref 0.7480 ref - - - - -

Note: Controlling dimensions are in millimeters.

Approximate dimensions are provided in inches

TO92

Dim. Millimeters Inches

Min. Max. Min. Max.

A 4.32 4.95 0.170 0.195

b 0.36 0.51 0.014 0.020

C 2.50 3.50 0.099 0.138

E 3.30 3.94 0.130 0.155

e 4.88 5.88 0.192 0.232

e1 2.44 2.94 0.096 0.116

L 12.70 15.49 0.500 0.610

R 2.16 2.41 0.085 0.095

S1 1.14 1.52 0.045 0.060

W 0.41 0.56 0.016 0.022

D 4.45 4.95 0.175 0.195

*° 4° 6° 4° 6°

Note: Controlling dimensions are in millimeters.

Approximate dimensions are provided in inches

SOT23-5

Dim. Millimeters Inches

Min. Max. Min. Max.

A 0.90 1.45 0.0354 0.0570

A1 0.00 0.15 0.00 0.0059

A2 0.90 1.30 0.0354 0.0511

b 0.20 0.50 0.0078 0.0196

C 0.09 0.26 0.0035 0.0102

D 2.70 3.10 0.1062 0.1220

E 2.20 3.20 0.0866 0.1181

E1 1.30 1.80 0.0511 0.0708

e 0.95 REF 0.0374 REF

e1 1.90 REF 0.0748 REF

L 0.10 0.60 0.0039 0.0236

a° 0° 30° 0° 30°

Note: Controlling dimensions are in millimeters.

Approximate dimensions are provided in inches

ZTL431/ZTL432

Document number: DS33263 Rev. 15 - 2 9 of 9

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