ZR431FTC Equivalent & Substitute Parts

Part Overview

The ZR431FTC 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, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	ZR431FTC Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	20V
Current - Output	100 mA
Tolerance	±2%
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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the ZR431FTC is determined by the following critical parameters:

Reference Type: Shunt (all substitutes must be shunt references)
Output Type: Adjustable (all substitutes must support adjustable output)
Package: SOT-23-3 (mechanical and electrical compatibility)
Voltage Output Range: Minimum 2.5V, Maximum at least 20V
Current Output: 100 mA capability
Mounting Type: Surface Mount

Substitutes are grouped into two categories:

Parametric Equivalent: ZR431FTA maintains identical electrical specifications to the ZR431FTC with the same manufacturer (Diodes Incorporated), differing only in packaging format (Tape & Reel vs. bulk) and product status (Active vs. Obsolete).

Manufacturer Recommended Alternatives: SPX2431M-L/TR (MaxLinear) and TL431 series variants (Texas Instruments) provide enhanced performance characteristics while maintaining functional compatibility. These parts exceed the minimum requirements for voltage output range, tolerance, and temperature coefficient.

Parameter Comparison

Parameter	ZR431FTC	ZR431FTA	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	±2%	±2%	±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
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Replacement (Preferred for Existing Designs):

ZR431FTA is the direct parametric equivalent and primary choice for replacing ZR431FTC. Both parts share identical electrical specifications and are manufactured by Diodes Incorporated. The ZR431FTA is currently in active production with higher inventory availability, ensuring supply chain continuity.

Enhanced Performance Alternatives:

The TL431 series from Texas Instruments (TL431BCDBZR, TL431BCDBZT, TL431BIDBZR, TL431BIDBZT, TL431BQDBZR, TL431BQDBZT) and SPX2431M-L/TR from MaxLinear provide superior performance characteristics:

Improved tolerance (±0.5% vs. ±2%)
Extended maximum output voltage (36V vs. 20V)
Enhanced temperature coefficient performance (SPX2431M-L/TR: 30ppm/°C)
Extended operating temperature ranges (TL431BQDBZR/BQT: -40°C to 125°C)

These alternatives are suitable for applications requiring tighter voltage regulation or broader operating conditions. All maintain SOT-23-3 package compatibility and 100 mA output current capability.

Compliance Considerations:

All substitute parts maintain RoHS3 compliance and MSL-1 moisture sensitivity ratings, ensuring compatibility with standard manufacturing and storage practices. REACH and ECCN classifications remain consistent across all options.

Frequently Asked Questions (FAQ)

Q: Can ZR431FTA directly replace ZR431FTC without circuit modifications?

A: Yes. ZR431FTA is a parametric equivalent with identical electrical specifications. No circuit modifications are required. The only difference is packaging format (Tape & Reel vs. bulk) and active product status.

Q: What are the advantages of using TL431 series parts instead of ZR431FTA?

A: TL431 series variants offer tighter tolerance (±0.5% vs. ±2%), higher maximum output voltage (36V vs. 20V), and extended temperature ranges. These improvements benefit applications requiring higher precision voltage regulation or operation beyond -40°C to 85°C.

Q: Are all substitute parts pin-compatible with ZR431FTC?

A: Yes. All listed substitutes use the SOT-23-3 package with identical pinout. Direct socket replacement is possible without PCB modifications.

Q: Which substitute offers the best temperature stability?

A: SPX2431M-L/TR provides the lowest temperature coefficient at 30ppm/°C compared to ZR431FTC at 55ppm/°C, resulting in superior voltage stability across temperature variations.

Q: What is the difference between TL431BIDBZR and TL431BQDBZR?

A: Both parts share identical electrical specifications. The primary difference is operating temperature range: TL431BIDBZR operates -40°C to 85°C, while TL431BQDBZR extends to -40°C to 125°C. Select based on application temperature requirements.

Q: Are there inventory considerations when selecting a substitute?

A: Yes. Inventory levels vary significantly: TL431BIDBZT has the highest availability (1,000,300 pcs), while TL431BQDBZT has lower stock (14,100 pcs). ZR431FTA offers 15,431 pcs. Consider lead time and supply chain requirements for production planning.

Q: Can I use TL431BCDBZR in applications requiring -40°C operation?

A: No. TL431BCDBZR operates only 0°C to 70°C. For -40°C operation, select TL431BIDBZR, TL431BIDBZT, TL431BQDBZR, TL431BQDBZT, or ZR431FTA.

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