TL431CPK Equivalent & Substitute Parts

Part Overview

The TL431CPK is an adjustable shunt voltage reference IC manufactured by Texas Instruments, designed for power management applications. This Surface Mount device operates across 0°C to 70°C and delivers 100 mA output current with ±2.2% tolerance. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified when design requirements demand extended temperature ranges, improved tolerance specifications, or alternative sourcing for supply chain continuity.

Substiute Parts

TL431CPK

Texas InstrumentsIn Stock: 9479TL431CPK Datasheet

Current PartRFQ

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

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TL431CPK is determined by the following core parameters:

• Reference Type: Shunt (all substitutes maintain this classification)
• Output Type: Adjustable (all substitutes provide adjustable output)
• Voltage Range: 2.5V minimum to 36V maximum (all substitutes operate within this range)
• Current - Output: 100 mA (all substitutes deliver identical output current)
• Current - Cathode: 1 mA (all substitutes maintain this specification)
• Package / Case: TO-243AA with SOT-89-3 supplier device package (all substitutes use identical packaging)
• Mounting Type: Surface Mount (all substitutes are surface mount)
• RoHS Status: ROHS3 Compliant (all substitutes meet this compliance requirement)

Substitute parts from Diodes Incorporated (AS431 and AZ431 series) meet all mandatory electrical and mechanical parameters. Variations in tolerance (±0.4% to ±1%), temperature coefficient (20ppm/°C typical), and operating temperature range (-40°C to 125°C) represent performance enhancements rather than compatibility restrictions.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the original TL431CPK.

AS431ARTR-G1 provides the tightest tolerance specification at ±0.5% with extended operating temperature range (-40°C to 125°C). This part is suitable for applications requiring improved accuracy over the standard ±2.2% tolerance of the TL431CPK.

AS431BRTR-E1 and AS431BRTR-G1 both deliver ±1% tolerance with identical electrical performance. AS431BRTR-E1 is packaged in Tape & Reel format with MSL 1 (Unlimited moisture sensitivity), while AS431BRTR-G1 carries MSL 3 (168 Hours). Selection between these variants depends on storage and handling requirements.

AZ431AR-ATRE1 offers the highest tolerance specification at ±0.4% with extended temperature range, suitable for precision reference applications. AZ431BR-ATRE1 provides ±0.8% tolerance with MSL 1 (Unlimited) rating, supporting extended shelf life requirements.

All substitute parts are electrically and mechanically compatible with the TL431CPK within the specified parameter boundaries.

Frequently Asked Questions (FAQ)

Q: Can AS431 and AZ431 series parts directly replace the TL431CPK?

A: Yes. All listed substitute parts share identical electrical specifications (100 mA output current, 2.5V to 36V range, 1 mA cathode current) and mechanical packaging (SOT-89-3, TO-243AA). Pin configuration and functional operation are equivalent.

Q: What is the significance of tolerance differences between TL431CPK (±2.2%) and substitute parts (±0.4% to ±1%)?

A: Tolerance specifications define the accuracy of the output voltage reference. Substitute parts with tighter tolerances (±0.4%, ±0.5%, ±0.8%, ±1%) provide improved voltage stability compared to the TL431CPK. Selection depends on application accuracy requirements.

Q: Why do substitute parts specify extended operating temperature ranges (-40°C to 125°C) compared to TL431CPK (0°C to 70°C)?

A: Extended temperature ranges indicate broader environmental qualification. Applications requiring operation below 0°C or above 70°C must use substitute parts with appropriate temperature specifications. Within the TL431CPK temperature window (0°C to 70°C), all substitutes operate identically.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging is supplied in smaller quantities on cut strips, while Tape & Reel packaging is supplied on continuous reels for automated assembly. Both formats contain identical components. Selection depends on production volume and assembly equipment compatibility.

Q: How do Moisture Sensitivity Level (MSL) ratings affect part selection?

A: MSL ratings define storage conditions and shelf life. MSL 1 (Unlimited) allows indefinite storage at standard conditions. MSL 2 (1 Year) and MSL 3 (168 Hours) require controlled storage environments. For applications with extended inventory holding periods, MSL 1 rated parts (AS431BRTR-E1, AZ431BR-ATRE1) are preferred.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the regulatory status of the TL431CPK.