TL431CPKG3 Equivalent & Substitute Parts

Part Overview

The TL431CPKG3 is a shunt voltage reference IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This adjustable reference device operates with a 2.495V minimum output and supports up to 36V maximum, delivering 100 mA output current with ±2.2% tolerance in a SOT-89-3 surface mount package. The product is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

TL431CPKG3

Texas InstrumentsIn Stock: 2459TL431CPKG3 Datasheet

Current PartRFQ

TL431CPK

Texas InstrumentsIn Stock: 9479TL431CPK Datasheet

MFR RecommendedRFQ

AS431ARTR-G1

Diodes IncorporatedIn Stock: 22177AS431ARTR-G1 Datasheet

MFR RecommendedRFQ

AS431BRTR-E1

Diodes IncorporatedIn Stock: 93324AS431BRTR-E1 Datasheet

MFR RecommendedRFQ

AS431BRTR-G1

Diodes IncorporatedIn Stock: 35126AS431BRTR-G1 Datasheet

MFR RecommendedRFQ

AZ431AR-ATRE1

Diodes IncorporatedIn Stock: 114434AZ431AR-ATRE1 Datasheet

MFR RecommendedRFQ

AZ431BR-ATRE1

Diodes IncorporatedIn Stock: 134294AZ431BR-ATRE1 Datasheet

MFR RecommendedRFQ

LM431SCCMLX

onsemiIn Stock: 19203LM431SCCMLX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL431CPKG3 is determined by strict alignment of the following critical parameters:

Mandatory Compatibility Parameters:

• Reference Type: Shunt
• Output Type: Adjustable
• Voltage - Output (Max): 36V
• Current - Output: 100 mA
• Current - Cathode: 1 mA
• Package / Case: TO-243AA
• Supplier Device Package: SOT-89-3
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

• Voltage - Output (Min/Fixed): 2.495V to 2.5V (within design tolerance)
• Tolerance: ±2.2% to ±0.4% (tighter tolerance acceptable)
• Operating Temperature: Extended ranges acceptable for wider temperature support
• Temperature Coefficient: Provided when available
• Moisture Sensitivity Level (MSL): Variation acceptable based on application requirements
• Product Status: Active status preferred over obsolete

All substitute parts listed maintain identical electrical and mechanical specifications within the allowable variation range, ensuring direct functional replacement in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: TL431CPK

The TL431CPK is the direct active equivalent from Texas Instruments. It maintains identical electrical specifications (2.495V output, ±2.2% tolerance) and mechanical packaging (SOT-89-3) as the obsolete TL431CPKG3. This part is currently in active production status with 9,400 units in stock, providing immediate availability and long-term supply continuity. The TL431CPK is ROHS3 compliant and carries the same MSL rating, ensuring compatibility with existing manufacturing processes.

Secondary Recommendations: Diodes Incorporated AS431 and AZ431 Series

The AS431ARTR-G1, AS431BRTR-E1, AS431BRTR-G1, AZ431AR-ATRE1, and AZ431BR-ATRE1 from Diodes Incorporated provide functional equivalence with enhanced specifications. These parts maintain the same 36V maximum output, 100 mA current capability, and SOT-89-3 packaging. Key differences include tighter tolerance ratings (±0.4% to ±1% versus ±2.2%), extended operating temperature ranges (-40°C to 125°C), and improved temperature coefficients (20ppm/°C). These parts are suitable for applications requiring higher precision or wider temperature operation. All are ROHS3 compliant and in active production.

Alternative Recommendation: LM431SCCMLX

The LM431SCCMLX from onsemi provides functional equivalence with ±0.5% tolerance and 2.495V output matching the original part. This option supports a -25°C to 85°C operating range and includes unlimited MSL rating. The LM431SCCMLX is ROHS3 compliant and currently in active production with 19,172 units available.

Selection Criteria:

• For direct replacement with identical specifications: TL431CPK
• For enhanced precision and extended temperature range: AZ431AR-ATRE1 (±0.4% tolerance) or AS431ARTR-G1 (±0.5% tolerance)
• For cost-optimized substitution with acceptable tolerance: AS431BRTR-E1 or AS431BRTR-G1 (±1% tolerance)
• For alternative manufacturer sourcing: LM431SCCMLX

All recommended substitutes are ROHS3 compliant and maintain the mandatory electrical and mechanical parameters required for direct circuit compatibility.

Frequently Asked Questions (FAQ)

Q: Can I directly replace TL431CPKG3 with TL431CPK?

A: Yes. The TL431CPK is the active production equivalent from Texas Instruments with identical electrical specifications (2.495V output, ±2.2% tolerance, 100 mA output current) and mechanical packaging (SOT-89-3). No circuit modifications are required.

Q: What is the difference between the Diodes Incorporated AS431 and AZ431 series?

A: Both series maintain identical core electrical parameters (2.5V output, 36V maximum, 100 mA current, SOT-89-3 package). The primary differences are tolerance ratings and temperature coefficients. The AZ431 series offers tighter tolerance specifications (±0.4% to ±0.8%) compared to the AS431 series (±0.5% to ±1%), making AZ431 parts suitable for precision applications. Both series support -40°C to 125°C operating temperature range.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (TL431CPK, AS431ARTR-G1, AS431BRTR-E1, AS431BRTR-G1, AZ431AR-ATRE1, AZ431BR-ATRE1, and LM431SCCMLX) are ROHS3 compliant, meeting environmental and regulatory requirements.

Q: What is the significance of Moisture Sensitivity Level (MSL) differences?

A: MSL ratings indicate component sensitivity to moisture during storage and handling. The original TL431CPKG3 carries MSL 2 (1 Year shelf life). Substitute parts vary: AS431BRTR-E1, AZ431BR-ATRE1, and LM431SCCMLX offer MSL 1 (Unlimited shelf life), providing extended storage capability. AS431ARTR-G1 and AS431BRTR-G1 carry MSL 3 (168 Hours), requiring more careful moisture control. Selection depends on storage and manufacturing environment requirements.

Q: Can I use a substitute with tighter tolerance (±0.4% or ±0.5%) in place of the ±2.2% original?

A: Yes. Tighter tolerance specifications are functionally compatible and provide improved precision. Parts such as AZ431AR-ATRE1 (±0.4%) and AS431ARTR-G1 (±0.5%) can directly replace the TL431CPKG3 without circuit modifications. The improved tolerance may enhance overall system performance in precision applications.

Q: What is the operating temperature range difference, and does it matter?

A: The original TL431CPKG3 operates 0°C to 70°C. Most substitute parts (AS431 and AZ431 series) support -40°C to 125°C, providing extended temperature capability. The LM431SCCMLX supports -25°C to 85°C. Selection depends on application temperature requirements. Extended range parts are suitable for industrial and automotive environments.

Q: Are there packaging differences between substitute parts?

A: No. All substitute parts maintain identical mechanical packaging: TO-243AA case style, SOT-89-3 supplier device package, and surface mount mounting type. PCB layout and assembly processes require no modification.

Q: Which substitute offers the best availability?

A: AZ431BR-ATRE1 has the highest inventory (134,200 units), followed by AS431BRTR-E1 (93,300 units) and AZ431AR-ATRE1 (114,410 units). TL431CPK offers 9,400 units. Availability should be confirmed with your component supplier for current stock status.