ZR431F01TC Equivalent & Substitute Parts

Part Overview

The ZR431F01TC 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 ±1% tolerance in a SOT-23-3 surface mount package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production support. Substitute parts must maintain electrical compatibility across output voltage range, current capacity, tolerance specifications, and package form factor.

Key Parameters

Parameter	ZR431F01TC Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	20V
Current - Output	100 mA
Tolerance	±1%
Temperature Coefficient	55ppm/°C
Current - Cathode	50 µA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the ZR431F01TC is determined by the following critical parameters:

Reference Type & Output Type: Must be Shunt type with Adjustable output
Output Voltage Range: Minimum 2.5V and maximum voltage ≥20V
Current - Output: Must support 100 mA
Tolerance: ±1% or better (lower tolerance values are acceptable)
Package / Case: Must be SOT-23-3 (TO-236-3, SC-59)
Mounting Type: Surface Mount required
Operating Temperature: Must cover at least -40°C to 85°C range
Compliance: RoHS3 compliance required

Substitutes are grouped into two categories:

Direct Parametric Equivalent: ZR431F01TA maintains identical electrical specifications and is from the same manufacturer (Diodes Incorporated).

Cross-Manufacturer Alternatives: SPX2431M-L/TR (MaxLinear) and TL431 series variants (Texas Instruments) meet or exceed the electrical requirements with enhanced specifications in certain parameters.

Parameter Comparison

Parameter	ZR431F01TC	ZR431F01TA	SPX2431M-L/TR	TL431BCDBZR	TL431BCDBZT	TL431BIDBZR	TL431BIDBZT	TL431BQDBZR	TL431BQDBZT
Manufacturer	Diodes Inc.	Diodes Inc.	MaxLinear	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Reference Type	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min/Fixed)	2.5V	2.5V	2.5V	2.495V	2.495V	2.495V	2.495V	2.495V	2.495V
Voltage - Output (Max)	20V	20V	20V	36V	36V	36V	36V	36V	36V
Current - Output	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Tolerance	±1%	±1%	±1%	±0.5%	±0.5%	±0.5%	±0.5%	±0.5%	±0.5%
Temperature Coefficient	55ppm/°C	55ppm/°C	30ppm/°C	—	—	—	—	—	—
Current - Cathode	50 µA	50 µA	1 mA	600 µA	600 µA	700 µA	700 µA	700 µA	700 µA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 105°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

ZR431F01TA is the primary direct substitute. It is manufactured by Diodes Incorporated with identical electrical specifications, ROHS3 compliance, and active product status. This part maintains the same tolerance (±1%), temperature coefficient (55ppm/°C), and operating temperature range (-40°C ~ 85°C). Inventory availability is significantly higher (35,400 units) compared to the obsolete ZR431F01TC.

SPX2431M-L/TR (MaxLinear) is suitable for applications requiring enhanced temperature coefficient performance (30ppm/°C versus 55ppm/°C). It maintains ±1% tolerance and supports the full output voltage range. Operating temperature range extends to 105°C. Higher cathode current (1 mA) may require circuit design consideration. RoHS compliance is confirmed.

TL431BIDBZT and TL431BIDBZR (Texas Instruments) provide superior tolerance (±0.5% versus ±1%) and extended operating temperature range (-40°C ~ 85°C). These parts support higher maximum output voltage (36V versus 20V), offering design flexibility. Cathode current is 700 µA. Inventory availability is substantial (125,300 and higher units). ROHS3 compliant.

TL431BQDBZT and TL431BQDBZR (Texas Instruments) extend operating temperature to -40°C ~ 125°C, suitable for high-temperature applications. ±0.5% tolerance and 36V maximum output voltage are maintained. ROHS3 compliant with strong inventory support.

TL431BCDBZT and TL431BCDBZR (Texas Instruments) operate within 0°C ~ 70°C range, limiting use to standard industrial temperature applications. These are suitable only when the narrower temperature range meets design requirements.

Frequently Asked Questions (FAQ)

Q: Can ZR431F01TA directly replace ZR431F01TC without circuit modifications?

A: Yes. ZR431F01TA is a parametric equivalent with identical electrical specifications, tolerance, temperature coefficient, and operating temperature range. No circuit modifications are required.

Q: What are the key differences between Diodes and Texas Instruments substitutes?

A: Texas Instruments TL431 series parts offer ±0.5% tolerance (versus ±1%), higher maximum output voltage (36V versus 20V), and extended temperature ranges. Cathode current is higher (600–700 µA versus 50 µA). These differences may require circuit design review depending on application requirements.

Q: Is SPX2431M-L/TR compatible with designs using ZR431F01TC?

A: SPX2431M-L/TR meets the core electrical requirements (2.5V–20V adjustable output, 100 mA, ±1% tolerance, SOT-23-3 package). The improved temperature coefficient (30ppm/°C) and higher cathode current (1 mA) should be verified against circuit design specifications.

Q: Do all substitute parts use the same SOT-23-3 package?

A: Yes. All listed substitutes use SOT-23-3 (TO-236-3, SC-59) surface mount packaging, ensuring mechanical and electrical pin compatibility.

Q: Which substitute offers the widest operating temperature range?

A: TL431BQDBZT and TL431BQDBZR support -40°C ~ 125°C, the widest range among all substitutes. This is suitable for extended temperature applications.

Q: Are all substitutes RoHS compliant?

A: Yes. All listed substitutes are RoHS compliant (ROHS3 or RoHS). Compliance certifications are confirmed for production use.

Q: What is the significance of cathode current differences?

A: Cathode current affects the minimum load requirement for stable operation. ZR431F01TC requires 50 µA minimum cathode current, while substitutes range from 1 mA to 700 µA. Circuit designs must ensure adequate cathode current draw to maintain regulation.

Q: Can I use TL431BCDBZT in place of ZR431F01TC if operating temperature is limited to 0°C ~ 70°C?

A: Yes, if your application operates within 0°C ~ 70°C. However, TL431BIDBZT or TL431BQDBZT are preferred for broader temperature coverage at the same cost and availability.

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