LM431CIM3 Equivalent & Substitute Parts

Part Overview

The LM431CIM3 is a shunt voltage reference IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This adjustable reference device operates with an output voltage range of 2.5V to 37V and delivers up to 100 mA of output current. The LM431CIM3 is designated as Last Time Buy, indicating discontinued production status. Alternative equivalent and substitute parts are necessary to ensure design continuity and long-term component availability for new production runs and system redesigns.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM431CIM3
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	37V
Current - Output	100 mA
Tolerance	-0.6%, +0.4%
Temperature Coefficient	50 ppm/°C Typical
Current - Cathode	1 mA
Operating Temperature	-40°C to 85°C
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 of the LM431CIM3 is determined by the following critical parameters: reference type (shunt), output type (adjustable), output voltage range (minimum 2.5V, maximum 37V), output current capability (100 mA), package type (SOT-23-3), and mounting type (surface mount). Parts are grouped into three categories based on their relationship to the main part:

Upgrade Substitutes (TL431 Series): Parts that maintain identical or superior electrical performance while offering improved specifications. These include TL431BQDBZR, TL431BQDBZRQ1, and TL431BQDBZT. These parts feature tighter tolerance (±0.5% versus -0.6%, +0.4%), extended operating temperature range (-40°C to 125°C versus -40°C to 85°C), and lower cathode current (700 µA versus 1 mA). All maintain 100 mA output current and SOT-23-3 packaging.

Parametric Equivalents (LM431 Series): Parts with identical electrical specifications to the LM431CIM3, including LM431CIM3/NOPB, LM431CIM3X, and LM431CIM3X/NOPB. These maintain the same voltage range, tolerance, temperature coefficient, and cathode current. Differences exist only in product status and packaging designations.

Manufacturer Recommended Equivalent (AS431HMANTR-G1): A Diodes Incorporated part offering comparable performance with minor parameter variations. This part maintains the same output voltage range (2.495V to 36V), 100 mA output current, and SOT-23-3 packaging, with improved temperature coefficient (20 ppm/°C versus 50 ppm/°C) and lower cathode current (500 µA versus 1 mA).

Parameter Comparison

Part Number	Manufacturer	Voltage Output (Min)	Voltage Output (Max)	Current Output	Tolerance	Temp Coefficient	Cathode Current	Operating Temp	Product Status	Package
LM431CIM3	Texas Instruments	2.5V	37V	100 mA	-0.6%, +0.4%	50 ppm/°C	1 mA	-40°C to 85°C	Last Time Buy	SOT-23-3
TL431BQDBZR	Texas Instruments	2.495V	36V	100 mA	±0.5%	—	700 µA	-40°C to 125°C	Active	SOT-23-3
TL431BQDBZRQ1	Texas Instruments	2.495V	36V	100 mA	±0.5%	—	700 µA	-40°C to 125°C	Active	SOT-23-3
TL431BQDBZT	Texas Instruments	2.495V	36V	100 mA	±0.5%	—	700 µA	-40°C to 125°C	Active	SOT-23-3
LM431CIM3/NOPB	Texas Instruments	2.5V	37V	100 mA	-0.6%, +0.4%	50 ppm/°C	1 mA	-40°C to 85°C	Active	SOT-23-3
LM431CIM3X	Texas Instruments	2.5V	37V	100 mA	-0.6%, +0.4%	50 ppm/°C	1 mA	-40°C to 85°C	Last Time Buy	SOT-23-3
LM431CIM3X/NOPB	Texas Instruments	2.5V	37V	100 mA	-0.6%, +0.4%	50 ppm/°C	1 mA	-40°C to 85°C	Active	SOT-23-3
AS431HMANTR-G1	Diodes Incorporated	2.495V	36V	100 mA	±0.5%	20 ppm/°C	500 µA	-40°C to 125°C	Active	SOT-23-3

Engineering Selection Recommendations

For applications requiring immediate component availability and long-term supply assurance, the TL431 series (TL431BQDBZR, TL431BQDBZRQ1, TL431BQDBZT) represents the primary upgrade path. These parts are in Active product status and offer extended operating temperature range to 125°C, making them suitable for industrial and automotive applications.

The LM431CIM3/NOPB and LM431CIM3X/NOPB provide parametric equivalence with identical electrical specifications and are available in Active status. These parts maintain the original voltage range of 37V maximum and are suitable for direct replacement in existing designs.

The AS431HMANTR-G1 from Diodes Incorporated is qualified as a manufacturer-recommended equivalent. This part offers superior temperature coefficient performance (20 ppm/°C) and lower cathode current consumption, with Active product status and extended temperature range. This part is suitable for applications where improved thermal stability and reduced quiescent current are beneficial.

For new designs, selection should prioritize parts with Active product status to ensure long-term availability. The TL431BQDBZRQ1 includes AEC-Q100 automotive qualification, making it appropriate for automotive and mission-critical applications.

Frequently Asked Questions (FAQ)

Q: Can the TL431BQDBZR directly replace the LM431CIM3?

A: Yes. Both parts share identical SOT-23-3 packaging, 100 mA output current capability, and adjustable reference output type. The TL431BQDBZR operates across an extended temperature range (-40°C to 125°C versus -40°C to 85°C) and features tighter tolerance (±0.5% versus -0.6%, +0.4%). The output voltage range differs slightly (36V maximum versus 37V maximum), which is acceptable for most applications operating below 36V.

Q: What is the difference between LM431CIM3 and LM431CIM3/NOPB?

A: These parts are parametrically identical. The "/NOPB" designation indicates lead-free, RoHS-compliant packaging. Both maintain identical electrical specifications, voltage range, tolerance, and temperature coefficient. The primary difference is product status: LM431CIM3 is Last Time Buy, while LM431CIM3/NOPB is Active.

Q: Is the AS431HMANTR-G1 compatible with the LM431CIM3?

A: Yes, with minor considerations. Both parts are SOT-23-3 surface mount shunt voltage references with 100 mA output current. The AS431HMANTR-G1 offers improved temperature coefficient (20 ppm/°C versus 50 ppm/°C) and lower cathode current (500 µA versus 1 mA). The output voltage range is slightly reduced (36V maximum versus 37V maximum). This part is suitable for applications operating within 36V maximum output voltage.

Q: Why does the TL431BQDBZRQ1 have AEC-Q100 qualification?

A: The TL431BQDBZRQ1 is specifically qualified for automotive applications per AEC-Q100 standards. This qualification indicates the part meets automotive reliability and quality requirements. This designation is relevant only for automotive or mission-critical applications; standard industrial applications can use any of the substitute parts listed.

Q: What is the significance of the Last Time Buy status for LM431CIM3?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part. Existing inventory may be available, but no new production runs are planned. For new designs or long-term production requirements, selection of an Active status part (such as LM431CIM3/NOPB, TL431BQDBZR, or AS431HMANTR-G1) is recommended to ensure sustained component availability.

Q: Can I use the LM431CIM3X as a substitute for the LM431CIM3?

A: Yes. The LM431CIM3X is parametrically identical to the LM431CIM3, with identical voltage range (2.5V to 37V), tolerance (-0.6%, +0.4%), and temperature coefficient (50 ppm/°C). Both parts use SOT-23-3 packaging. However, the LM431CIM3X is also designated Last Time Buy, so it should not be selected for new designs requiring long-term availability.

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