TL431BIDRE4 Equivalent & Substitute Parts

Part Overview

The TL431BIDRE4 is a shunt voltage reference IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This adjustable reference device operates across a 2.495V to 36V output range with ±0.5% tolerance and supports 100 mA output current in an 8-SOIC surface mount package. The TL431BIDRE4 is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL431BIDRE4
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±0.5%
Current - Cathode	700 µA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TL431BIDRE4 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Reference Type: Shunt (all substitutes must maintain shunt topology)
Output Type: Adjustable (voltage reference must be adjustable)
Package / Case: 8-SOIC (0.154", 3.90mm Width) (identical footprint required)
Mounting Type: Surface Mount (same mounting technology)
Current - Output: 100 mA (minimum requirement)
Operating Temperature Range: Must support -40°C ~ 85°C minimum

Substitution Criteria: Substitute parts are grouped into two categories based on electrical performance alignment with the TL431BIDRE4:

Category 1 - Direct Functional Equivalents (Identical Specifications): Parts that match the TL431BIDRE4 output voltage range (2.495V to 36V), tolerance (±0.5%), and cathode current (700 µA). These provide drop-in replacement capability with no circuit redesign.

Category 2 - Compatible Alternatives (Relaxed Specifications): Parts that maintain the same output voltage range and current rating but differ in tolerance (±1% to ±2.2%) or cathode current (1 mA). These require verification that the application tolerates the specified parameter variations but remain electrically compatible within the 8-SOIC package.

Parameter Comparison

Part Number	Manufacturer	Voltage Min	Voltage Max	Current Output	Tolerance	Cathode Current	Temp Range	Product Status
TL431BIDRE4	Texas Instruments	2.495V	36V	100 mA	±0.5%	700 µA	-40°C ~ 85°C	Obsolete
TL431BIDR	Texas Instruments	2.495V	36V	100 mA	±0.5%	700 µA	-40°C ~ 85°C	Active
LM431CIM/NOPB	Texas Instruments	2.5V	37V	100 mA	-0.6%, +0.4%	1 mA	-40°C ~ 85°C	Active
LM431AIM/NOPB	Texas Instruments	2.495V	37V	100 mA	±2.2%	1 mA	-40°C ~ 85°C	Active
LM431AIMX/NOPB	Texas Instruments	2.495V	37V	100 mA	±2.2%	1 mA	-40°C ~ 85°C	Active
LM431BIM/NOPB	Texas Instruments	2.495V	37V	100 mA	±1%	1 mA	-40°C ~ 85°C	Active
KA431DTF	onsemi	2.5V	36V	100 mA	±2%	1 mA	-25°C ~ 85°C	Active
LM431AIMX	National Semiconductor	2.5V	36V	100 mA	±2%	1 mA	-40°C ~ 85°C	Active
LM431BCMX	National Semiconductor	2.495V	36V	100 mA	±1%	1 mA	-25°C ~ 85°C	Active
LM431CIMX	onsemi	2.495V	36V	100 mA	±0.5%	1 mA	-40°C ~ 85°C	Active
NCV431AIDR2G	onsemi	2.495V	36V	100 mA	±1%	1 mA	-40°C ~ 125°C	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement: TL431BIDR is the preferred substitute. This Texas Instruments part maintains identical electrical specifications (2.495V to 36V, ±0.5% tolerance, 700 µA cathode current) and operating temperature range (-40°C ~ 85°C). The part is currently in active production status with high inventory availability (55,200 units), ensuring long-term supply continuity. Packaging is available in Cut Tape and Digi-Reel formats.

Secondary Recommendation - Tolerance-Compatible Alternative: LM431CIMX (onsemi) provides ±0.5% tolerance matching with the TL431BIDRE4 and maintains the 2.495V to 36V output range. The primary difference is cathode current (1 mA versus 700 µA), which is acceptable in most applications where the reference is used in feedback networks. This part is ROHS3 compliant and actively produced.

Alternative for Extended Temperature Applications: NCV431AIDR2G (onsemi) extends the operating temperature range to -40°C ~ 125°C and carries AEC-Q100 automotive qualification. This part maintains ±1% tolerance and is suitable for applications requiring automotive-grade reliability or extended temperature operation beyond standard industrial ranges.

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the environmental compliance profile of the TL431BIDRE4. Parts sourced from National Semiconductor (LM431AIMX, LM431BCMX) carry legacy status and may have restricted availability; prioritize Texas Instruments or onsemi sourcing for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use LM431AIMX/NOPB as a direct replacement for TL431BIDRE4? A: LM431AIMX/NOPB is electrically compatible but not a direct replacement. It maintains the same 100 mA output current and 8-SOIC package, but tolerance is ±2.2% compared to the TL431BIDRE4's ±0.5%. Cathode current is 1 mA versus 700 µA. Use this part only if your circuit design tolerates ±2.2% reference accuracy variation.

Q: What is the difference between TL431BIDR and TL431BIDRE4? A: Both parts share identical electrical specifications (2.495V to 36V, ±0.5%, 100 mA, 700 µA cathode current). The primary difference is packaging format: TL431BIDR is available in Cut Tape and Digi-Reel, while TL431BIDRE4 was the original surface mount variant. TL431BIDR is the active production equivalent.

Q: Is NCV431AIDR2G suitable for non-automotive applications? A: Yes. NCV431AIDR2G is AEC-Q100 qualified but functions as a standard shunt reference in any application. The extended temperature range (-40°C ~ 125°C) and ±1% tolerance make it suitable for industrial and consumer applications requiring higher temperature operation or automotive-grade reliability margins.

Q: Can I substitute a part with ±2% tolerance for a ±0.5% tolerance design? A: Substitution depends on circuit requirements. If your feedback network or voltage regulation circuit is designed around ±0.5% accuracy, a ±2% part will introduce additional error. Verify that the application's tolerance budget accommodates the wider specification before substitution.

Q: Are all substitute parts available in the same 8-SOIC package? A: Yes. All listed substitutes use the 8-SOIC (0.154", 3.90mm Width) package with surface mount technology, ensuring PCB footprint compatibility. Verify packaging format (Tube, Cut Tape, Tape & Reel, Bulk) based on your procurement and assembly requirements.

Q: What is the significance of cathode current differences (700 µA vs. 1 mA)? A: Cathode current represents the minimum operating current required to maintain regulation. The TL431BIDRE4 requires 700 µA minimum; substitutes with 1 mA cathode current require slightly higher bias current. In most feedback applications, this difference is negligible, but verify in high-impedance or low-current circuits.

Q: Which substitute offers the best long-term availability? A: TL431BIDR (Texas Instruments) with 55,200 units in stock and active production status offers the strongest supply continuity. NCV431AIDR2G (onsemi) with 27,900 units also provides robust availability. Both are preferred over legacy National Semiconductor sourcing.

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