TL431CLPME3 Equivalent & Substitute Parts

Part Overview

The TL431CLPME3 is a shunt voltage reference IC manufactured by Texas Instruments, designed for adjustable voltage regulation applications. This component operates with an adjustable output range of 2.495V to 36V, delivering up to 100 mA output current with ±2.2% tolerance. The device is packaged in TO-92-3 through-hole configuration and is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL431CLPME3
Manufacturer	Texas Instruments
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	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TL431CLPME3 is determined by the following critical parameters:

Primary Substitution Criteria:

Reference Type: Shunt (must match)
Output Type: Adjustable (must match)
Voltage - Output (Min/Fixed): 2.495V or 2.5V (functionally equivalent)
Voltage - Output (Max): 36V (must match)
Current - Output: 100 mA (must match)
Mounting Type: Through Hole (must match)
Package / Case: TO-92-3 or compatible TO-92 variants (must match)

Secondary Compatibility Factors:

Tolerance: ±2.2% or better (tighter tolerance acceptable)
Current - Cathode: 1 mA nominal (variations acceptable within design margin)
Operating Temperature: Extended ranges acceptable for improved performance
RoHS Compliance: ROHS3 Compliant (required)

Substitute parts are grouped by manufacturer and tolerance grade. Parts meeting all primary criteria are considered direct substitutes. Parts with improved specifications (lower tolerance, extended temperature range, higher inventory availability) are classified as upgrades.

Parameter Comparison

Part Number	Manufacturer	Voltage Min	Voltage Max	Current Output	Tolerance	Cathode Current	Temp Range	Package	Status
TL431CLPME3	Texas Instruments	2.495V	36V	100 mA	±2.2%	1 mA	0°C ~ 70°C	TO-92-3	Obsolete
TL431CLPM	Texas Instruments	2.495V	36V	100 mA	±2.2%	1 mA	0°C ~ 70°C	TO-92-3	Active
TL431IZ-AP	STMicroelectronics	2.495V	36V	100 mA	±2.21%	1 mA	-40°C ~ 105°C	TO-92-3	Active
TL431IZT	STMicroelectronics	2.495V	36V	100 mA	±2.21%	1 mA	-40°C ~ 105°C	TO-92-3	Active
AS431AZTR-E1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AS431AZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AS431BZTR-E1	Diodes Incorporated	2.5V	36V	100 mA	±1%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AS431BZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±1%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AS431IAZTR-G1	Diodes Incorporated	2.5V	36V	100 mA	±0.5%	50 µA	-40°C ~ 125°C	TO-92-3	Active
AZ431AZ-ATRE1	Diodes Incorporated	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 125°C	TO-92-3	Active
AZ431AZ-ATRG1	Diodes Incorporated	2.5V	36V	100 mA	±0.4%	1 mA	-40°C ~ 125°C	TO-92-3	Active

Engineering Selection Recommendations

Direct Equivalent (Recommended for Drop-In Replacement): TL431CLPM is the primary equivalent, manufactured by Texas Instruments with identical electrical specifications and active product status. This part maintains the same tolerance (±2.2%), voltage range (2.495V to 36V), and operating temperature window (0°C to 70°C) as the obsolete TL431CLPME3. Both parts are ROHS3 compliant and suitable for direct substitution in existing designs.

Active Alternatives with Extended Temperature Range: STMicroelectronics TL431IZ-AP and TL431IZT offer improved operating temperature coverage (-40°C to 105°C) with negligible tolerance difference (±2.21% vs ±2.2%). These parts are active and ROHS3 compliant, providing enhanced reliability for applications requiring wider temperature operation.

High-Precision Upgrades: Diodes Incorporated AS431 and AZ431 series parts deliver superior tolerance specifications (±0.4% to ±0.5%) compared to the original ±2.2%. These upgrades maintain identical voltage and current ratings while extending operating temperature to -40°C to 125°C. The AZ431AZ-ATRE1 and AZ431AZ-ATRG1 offer the tightest tolerance (±0.4%) with highest inventory availability (1.3M+ units). All Diodes Incorporated parts are ROHS3 compliant and MSL Level 1.

Selection Criteria by Application:

Cost-sensitive applications: TL431CLPM (Texas Instruments equivalent)
Extended temperature requirements: TL431IZ-AP or TL431IZT (STMicroelectronics)
Precision voltage reference circuits: AZ431AZ-ATRE1 or AS431AZTR-E1 (Diodes Incorporated)
High-volume production: AZ431AZ-ATRE1 (1.3M+ inventory)

All recommended substitutes maintain TO-92-3 through-hole packaging, 100 mA output current, and 36V maximum voltage rating. ROHS3 compliance is universal across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can TL431CLPM be used as a direct replacement for TL431CLPME3? A: Yes. TL431CLPM is manufactured by Texas Instruments with identical electrical specifications, tolerance (±2.2%), voltage range (2.495V to 36V), and TO-92-3 packaging. The primary difference is product status: TL431CLPME3 is obsolete while TL431CLPM is active. Both are ROHS3 compliant.

Q: What is the difference between STMicroelectronics TL431IZ-AP and TL431IZT? A: Both parts are manufactured by STMicroelectronics with identical electrical specifications (±2.21% tolerance, 2.495V to 36V output, 100 mA current). The difference is packaging designation: TL431IZ-AP and TL431IZT represent different tape and reel configurations. Both are active and ROHS3 compliant with extended temperature range (-40°C to 105°C).

Q: Are Diodes Incorporated AS431 and AZ431 parts compatible with the original TL431CLPME3? A: Yes, with performance improvements. Both AS431 and AZ431 series maintain the same voltage range (2.5V to 36V), output current (100 mA), and TO-92-3 packaging. Key differences are tighter tolerance (±0.4% to ±0.5% vs ±2.2%), extended temperature range (-40°C to 125°C vs 0°C to 70°C), and higher inventory availability. These are upgrades suitable for applications requiring improved precision.

Q: Does the 2.5V output minimum (Diodes parts) versus 2.495V (Texas Instruments/STMicroelectronics) affect compatibility? A: The 50 mV difference is functionally equivalent for adjustable shunt reference applications. Both voltage levels fall within the adjustable output range and are suitable for voltage regulation circuits. Design verification is recommended for applications with tight voltage tolerance requirements.

Q: What is the significance of cathode current differences (1 mA vs 50 µA)? A: Cathode current represents the minimum operating current required for proper device operation. AS431IAZTR-G1 specifies 50 µA minimum versus 1 mA for other parts. Lower cathode current enables operation in lower-power applications. Both specifications are compatible with standard shunt reference circuit designs.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All recommended substitute parts (TL431CLPM, TL431IZ-AP, TL431IZT, AS431 series, and AZ431 series) are ROHS3 compliant. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for Diodes Incorporated parts and Not Applicable for Texas Instruments TL431CLPM.

Q: Which substitute offers the best inventory availability? A: AZ431AZ-ATRE1 (Diodes Incorporated) has the highest inventory with 1,300,100 units in stock. This part also offers the tightest tolerance (±0.4%) and extended temperature range (-40°C to 125°C), making it suitable for high-volume production requirements.

Q: Can I use these parts interchangeably in existing PCB designs? A: Yes. All substitute parts use identical TO-92-3 through-hole packaging with the same pin configuration. No PCB layout modifications are required. Electrical performance is compatible across all recommended substitutes for standard shunt voltage reference applications.

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