TL431ACPS Equivalent & Substitute Parts

Part Overview

The TL431ACPS is an adjustable precision shunt voltage reference IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This device functions as a shunt regulator with adjustable output voltage ranging from 2.495V to 36V, delivering up to 100mA output current with ±1% tolerance. The TL431ACPS is packaged in an 8-SOIC (0.209", 5.30mm Width) surface mount configuration and operates across the temperature range of 0°C to 70°C.

The TL431ACPS carries an Obsolete product status, indicating that this particular package variant is no longer in active production. Locating equivalent substitute parts becomes necessary for new designs, production continuations, or component replenishment when the original package configuration is unavailable or when transitioning to actively supported alternatives.

Substiute Parts

TL431ACPS

Texas InstrumentsIn Stock: 684TL431ACPS Datasheet

Current PartRFQ

TL431ACDBZR

Texas InstrumentsIn Stock: 77248TL431ACDBZR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL431ACPS is determined by electrical and mechanical parameter equivalence within the TL431 product family. The critical parameters governing substitution are:

Electrical Parameters:

• Reference Type: Shunt
• Output Type: Adjustable
• Voltage - Output (Min/Fixed): 2.495V
• Voltage - Output (Max): 36V
• Current - Output: 100mA
• Tolerance: ±1%
• Current - Cathode: 600µA
• Operating Temperature: 0°C ~ 70°C (TA)

Mechanical Parameters:

• Mounting Type: Surface Mount
• Base Product Number: TL431

The TL431ACDBZR qualifies as a direct substitute because it maintains identical electrical specifications across all critical parameters. The primary difference lies in the package configuration: the TL431ACDBZR utilizes a SOT-23-3 package instead of the 8-SOIC package of the TL431ACPS. Both variants are manufactured by Texas Instruments and share the same base product number (TL431), confirming functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The TL431ACDBZR is the appropriate substitute for the obsolete TL431ACPS based on the following factors:

Product Status Alignment: The TL431ACDBZR maintains Active product status with Texas Instruments, ensuring continued availability and long-term supply chain viability. The TL431ACPS, classified as Obsolete, presents supply constraints and potential discontinuation risks.

Electrical Equivalence: All critical electrical parameters are identical between the two parts, including output voltage range (2.495V to 36V), output current capacity (100mA), tolerance specification (±1%), and cathode current (600µA). Operating temperature range remains consistent at 0°C to 70°C.

Compliance and Certifications: Both parts maintain identical REACH Status (REACH Unaffected), ECCN classification (EAR99), and HTSUS code (8542.39.0001). The TL431ACDBZR achieves ROHS3 Compliance, meeting modern regulatory requirements. Moisture Sensitivity Level remains at 1 (Unlimited) for both variants.

Package Consideration: The substitution requires PCB layout modification due to the package change from 8-SOIC to SOT-23-3. The SOT-23-3 package is a smaller, three-pin configuration compared to the eight-pin SOIC package. Design teams must verify footprint compatibility and adjust board layouts accordingly.

Frequently Asked Questions (FAQ)

Q: Can the TL431ACDBZR directly replace the TL431ACPS without circuit modifications?

A: The TL431ACDBZR provides electrical equivalence to the TL431ACPS across all functional parameters. However, the package change from 8-SOIC to SOT-23-3 requires PCB footprint modification. The three-pin SOT-23-3 configuration differs significantly from the eight-pin SOIC layout, necessitating board redesign for physical placement and routing.

Q: What are the key electrical parameters that confirm substitution compatibility?

A: Substitution compatibility is confirmed by matching the following parameters: Reference Type (Shunt), Output Type (Adjustable), Voltage Output range (2.495V to 36V), Output Current (100mA), Tolerance (±1%), Cathode Current (600µA), and Operating Temperature (0°C to 70°C). The TL431ACDBZR maintains all these specifications identically to the TL431ACPS.

Q: Why is the TL431ACPS classified as Obsolete?

A: The TL431ACPS carries Obsolete status, indicating that Texas Instruments has discontinued production of this specific package variant. The base product (TL431) remains in active production through alternative package configurations such as the SOT-23-3 variant (TL431ACDBZR).

Q: Are there any compliance or regulatory differences between these parts?

A: Both parts maintain identical REACH Status (REACH Unaffected) and ECCN classification (EAR99). The TL431ACDBZR additionally achieves ROHS3 Compliance, which aligns with current environmental and regulatory standards. Moisture Sensitivity Level is identical at 1 (Unlimited) for both variants.

Q: What inventory considerations apply to these parts?

A: The TL431ACPS shows 667 pieces in stock as new original inventory. The TL431ACDBZR demonstrates significantly higher availability with 77,200 pieces in stock, reflecting its Active product status and continued market demand. For new designs or production continuations, the TL431ACDBZR offers superior supply chain reliability.

Q: How does the SOT-23-3 package differ from the 8-SOIC package?

A: The SOT-23-3 is a three-pin surface mount package, while the 8-SOIC is an eight-pin configuration. The SOT-23-3 provides a more compact footprint suitable for space-constrained applications. Pin assignments and functional connections differ between packages, requiring careful schematic and layout review during substitution.