TL431IDRE4 Equivalent & Substitute Parts

Part Overview

The TL431IDRE4 is a shunt voltage reference IC with adjustable output, manufactured by Texas Instruments in 8-SOIC surface mount packaging. This component is classified as a Power Management (PMIC) device and is discontinued at DiGi Electronics, with 903 pieces currently in stock. The part delivers a fixed output voltage of 2.495V with a maximum rating of 36V, ±2.2% tolerance, and 100 mA output current capability. Due to its discontinued status, identifying equivalent and substitute parts is essential for design continuity and long-term supply chain management.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL431IDRE4
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.495V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±2.2%
Current - Cathode	1 mA
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution eligibility for the TL431IDRE4 is determined by the following critical parameters:

Package Type: All substitutes must use 8-SOIC (0.154", 3.90mm Width) surface mount packaging for PCB compatibility
Reference Type: Shunt voltage reference architecture must be maintained
Output Type: Adjustable output configuration required
Voltage Range: Output voltage minimum of 2.495V and maximum of 36V or higher
Current Rating: 100 mA output current capability
Tolerance: ±2.2% or better (lower tolerance values are acceptable upgrades)
Operating Temperature: Minimum -40°C to maximum 85°C or extended range
Compliance: ROHS3 compliance and MSL 1 rating preferred for manufacturing compatibility

Substitute parts are grouped into two categories: MFR Recommended (direct replacements with identical or superior specifications) and Upgrade options (enhanced performance or extended operating range).

Parameter Comparison

Part Number	Manufacturer	Voltage Min/Fixed (V)	Voltage Max (V)	Current Output (mA)	Tolerance	Temp Range (°C)	Package	Status
TL431IDRE4	Texas Instruments	2.495	36	100	±2.2%	-40 ~ 85	8-SOIC	Discontinued
TL431IDR	Texas Instruments	2.495	36	100	±2.2%	-40 ~ 85	8-SOIC	Active
LM431AIM/NOPB	Texas Instruments	2.495	37	100	±2.2%	-40 ~ 85	8-SOIC	Active
LM431BIM/NOPB	Texas Instruments	2.495	37	100	±1%	-40 ~ 85	8-SOIC	Active
TL431IDT	STMicroelectronics	2.495	36	100	±2.21%	-40 ~ 105	8-SOIC	Active
TL431IYDT	STMicroelectronics	2.495	36	100	±2.21%	-40 ~ 125	8-SOIC	Active
KA431DTF	onsemi	2.5	36	100	±2%	-25 ~ 85	8-SOIC	Active
LM431AIMX	National Semiconductor	2.5	36	100	±2%	-40 ~ 85	8-SOIC	Active
LM431BCMX	National Semiconductor	2.495	36	100	±1%	-25 ~ 85	8-SOIC	Active
LM431CIMX	onsemi	2.495	36	100	±0.5%	-40 ~ 85	8-SOIC	Active
NCV431AIDR2G	onsemi	2.495	36	100	±1%	-40 ~ 125	8-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: TL431IDR

The TL431IDR is the direct active equivalent from Texas Instruments. It maintains identical electrical specifications (2.495V output, 36V maximum, ±2.2% tolerance, 100 mA) and operating temperature range (-40°C to 85°C). This part is currently in active production with 50,200 pieces in stock, ensuring supply continuity. ROHS3 compliance and MSL 1 rating match the original specification.

Secondary Recommendation: LM431BIM/NOPB

For applications requiring improved tolerance performance, the LM431BIM/NOPB offers ±1% accuracy versus the original ±2.2%. Electrical parameters remain compatible (2.495V output, 37V maximum, 100 mA). This part is active with 1,265 pieces available and maintains ROHS3 compliance.

Extended Temperature Option: TL431IYDT

The TL431IYDT from STMicroelectronics extends the operating temperature range to -40°C to 125°C while maintaining core specifications (2.495V output, 36V maximum, ±2.21% tolerance, 100 mA). This part carries AEC-Q100 automotive qualification and is suitable for applications requiring enhanced thermal performance. 100,200 pieces are in stock.

High-Precision Alternative: LM431CIMX

The LM431CIMX delivers ±0.5% tolerance for precision voltage reference applications. All other parameters align with the original (2.495V output, 36V maximum, 100 mA, -40°C to 85°C). This part is active with 1,810 pieces available.

Automotive-Grade Option: NCV431AIDR2G

The NCV431AIDR2G is qualified to AEC-Q100 automotive standards with extended temperature range (-40°C to 125°C) and ±1% tolerance. Electrical specifications match the original (2.495V output, 36V maximum, 100 mA). 27,900 pieces are in stock.

Frequently Asked Questions (FAQ)

Q: Can I use TL431IDR as a direct replacement for TL431IDRE4?

A: Yes. The TL431IDR is electrically and mechanically identical to the TL431IDRE4. Both use 8-SOIC packaging, deliver 2.495V adjustable output with 36V maximum rating, ±2.2% tolerance, and 100 mA output current. The primary difference is product status: TL431IDR is active in production while TL431IDRE4 is discontinued.

Q: What is the difference between ±2.2% and ±1% tolerance options?

A: Tolerance specifies the accuracy of the output voltage. The original TL431IDRE4 has ±2.2% tolerance, meaning the output voltage can vary by up to 2.2% from the nominal 2.495V value. Parts like LM431BIM/NOPB and NCV431AIDR2G offer ±1% tolerance, providing tighter voltage regulation. For applications requiring precise voltage references, the lower tolerance option improves performance.

Q: Are all substitute parts in 8-SOIC packaging?

A: Yes. All listed substitute parts use 8-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring direct PCB compatibility without layout modifications.

Q: Which substitute part has the widest operating temperature range?

A: The TL431IYDT and NCV431AIDR2G both operate from -40°C to 125°C, compared to the original -40°C to 85°C range. These parts are suitable for applications requiring extended thermal performance.

Q: Is the LM431AIMX a suitable replacement?

A: The LM431AIMX is electrically compatible (2.5V output, 36V maximum, ±2% tolerance, 100 mA, -40°C to 85°C) but carries RoHS non-compliant and REACH Affected status. For new designs or applications requiring current compliance standards, the ROHS3-compliant alternatives (TL431IDR, LM431BIM/NOPB, NCV431AIDR2G) are preferred.

Q: What is the significance of AEC-Q100 qualification?

A: AEC-Q100 qualification indicates the part meets automotive industry reliability and quality standards. Parts like TL431IYDT and NCV431AIDR2G carry this qualification, making them suitable for automotive and high-reliability applications requiring enhanced screening and testing.

Q: Can I substitute a part with a higher maximum voltage rating?

A: Yes. Parts with higher maximum voltage ratings (such as LM431AIM/NOPB at 37V versus the original 36V) are acceptable substitutes. The higher rating provides additional design margin without affecting circuit operation at the original voltage levels.

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