ZHT431F02TC Equivalent & Substitute Parts

Part Overview

The ZHT431F02TC is a shunt voltage reference IC manufactured by Diodes Incorporated, classified as a Power Management (PMIC) component. This adjustable reference provides a 2.5V to 20V output with ±2% tolerance in a SOT-23-3 surface mount package. The part is currently obsolete, with 744 units available in new original stock. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	ZHT431F02TC
Manufacturer	Diodes Incorporated
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	20V
Current - Output	100 mA
Tolerance	±2%
Temperature Coefficient	67 ppm/°C
Current - Cathode	50 µA
Operating Temperature	-55°C ~ 125°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the ZHT431F02TC is determined by the following critical parameters:

Electrical Compatibility Requirements:

Reference Type: Shunt (all substitutes must be shunt references)
Output Type: Adjustable (all substitutes must support adjustable output)
Voltage - Output (Min/Fixed): 2.5V minimum
Voltage - Output (Max): 20V or greater
Current - Output: 100 mA
Package / Case: SOT-23-3 (physical and electrical compatibility)

Tolerance and Performance Considerations:

Tolerance: ±2% or better (tighter tolerance is acceptable)
Temperature Coefficient: 67 ppm/°C or better (lower is acceptable)
Operating Temperature: Must support -55°C ~ 125°C or equivalent range

Compliance Requirements:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitutes are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (enhanced performance characteristics).

Parameter Comparison

Part Number	Manufacturer	Voltage Min/Fixed (V)	Voltage Max (V)	Current Output (mA)	Tolerance	Temp Coeff (ppm/°C)	Cathode Current (µA)	Operating Temp (°C)	Product Status
ZHT431F02TC	Diodes Incorporated	2.5	20	100	±2%	67	50	-55 ~ 125	Obsolete
ZHT431F02TA	Diodes Incorporated	2.5	20	100	±2%	67	50	-55 ~ 125	Active
SPX2431M-L/TR	MaxLinear, Inc.	2.5	20	100	±1%	30	1	0 ~ 105	Active
TL432BCDBZR	Texas Instruments	2.495	36	100	±0.5%	—	600	0 ~ 70	Active
TL432BCDBZT	Texas Instruments	2.495	36	100	±0.5%	—	600	0 ~ 70	Active
TL432BIDBZR	Texas Instruments	2.495	36	100	±0.5%	—	700	-40 ~ 85	Active
TL432BIDBZT	Texas Instruments	2.495	36	100	±0.5%	—	700	-40 ~ 85	Active
TL432BQDBZR	Texas Instruments	2.495	36	100	±0.5%	—	700	-40 ~ 125	Active

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement): ZHT431F02TA is the direct parametric equivalent to ZHT431F02TC. Both parts share identical electrical specifications and are manufactured by Diodes Incorporated. The primary distinction is product status: ZHT431F02TA is active with 7,795 units in stock, making it the preferred choice for immediate procurement. Both parts are ROHS3 compliant with MSL 1 (Unlimited).

Enhanced Performance Alternatives: The Texas Instruments TL432 series (TL432BCDBZR, TL432BCDBZT, TL432BIDBZR, TL432BIDBZT, TL432BQDBZR) and MaxLinear SPX2431M-L/TR offer improved electrical characteristics including tighter tolerance (±0.5% to ±1%) and extended voltage output range (up to 36V). These parts are suitable for applications requiring higher precision or broader voltage operating ranges. All alternatives maintain SOT-23-3 packaging and 100 mA output current compatibility.

Temperature Range Considerations: For applications requiring full -55°C to 125°C operation, ZHT431F02TA or TL432BQDBZR are appropriate selections. The TL432BQDBZR extends the upper temperature limit to 125°C while maintaining the lower limit at -40°C. Other TL432 variants operate within narrower temperature ranges (0°C ~ 70°C or -40°C ~ 85°C).

Compliance Status: All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) ratings, ensuring compatibility with modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can ZHT431F02TA directly replace ZHT431F02TC? A: Yes. ZHT431F02TA is a parametric equivalent with identical electrical specifications. The only difference is product status (active vs. obsolete) and packaging format. Both parts are pin-compatible in SOT-23-3 and require no circuit modifications.

Q: What is the difference between the Diodes Incorporated and Texas Instruments options? A: The Diodes ZHT431F02TA maintains the original specifications (±2% tolerance, 67 ppm/°C temperature coefficient, 20V maximum output). The Texas Instruments TL432 series offers enhanced performance with ±0.5% tolerance and extended voltage range to 36V, but operates within narrower temperature ranges depending on the specific variant selected.

Q: Which substitute should I use if my application requires -55°C operation? A: ZHT431F02TA is the only substitute that maintains the full -55°C to 125°C operating range. If enhanced performance is required at this temperature range, no TL432 variant is suitable; the application must remain with the Diodes Incorporated part.

Q: Are all substitutes available in SOT-23-3 packaging? A: Yes. All listed substitutes are available in SOT-23-3 (TO-236-3, SC-59) packaging, ensuring physical and electrical compatibility with the original ZHT431F02TC footprint.

Q: What is the impact of different cathode current specifications? A: Cathode current (50 µA for ZHT431F02TC, 1 mA to 700 µA for alternatives) affects circuit biasing requirements. Lower cathode current reduces power consumption but may require higher external bias resistances. Circuit validation is necessary when switching between parts with significantly different cathode current specifications.

Q: Can I use a TL432 variant with 36V maximum output in a 20V application? A: Yes. The TL432 series with 36V maximum output is backward compatible with 20V applications. The higher voltage rating provides additional design margin without affecting circuit operation at lower voltages.

Q: What packaging options are available for these substitutes? A: ZHT431F02TA is available in Cut Tape (CT) & Digi-Reel format. Texas Instruments TL432 variants are available in both Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel formats. MaxLinear SPX2431M-L/TR is supplied in Tape & Reel format. Packaging selection depends on procurement volume and assembly requirements.

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