TL431BU-TP Equivalent & Substitute Parts

Part Overview

The TL431BU-TP is a Shunt Voltage Reference IC manufactured by Micro Commercial Co, classified as a Power Management (PMIC) component. This device functions as a programmable voltage reference with a fixed output of 2.5V and maximum output capability of 36V, delivering up to 100mA of output current. The TL431BU-TP is designated as Obsolete product status, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters including output voltage range, current capacity, tolerance specifications, and physical packaging.

Substiute Parts

TL431BU-TP

Micro Commercial CoIn Stock: 912TL431BU-TP Datasheet

Current PartRFQ

TL431KA-TP

Micro Commercial CoIn Stock: 1117TL431KA-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL431BU-TP is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Reference Type: Shunt voltage reference architecture
• Output Type: Programmable voltage reference capability
• Voltage - Output (Min/Fixed): 2.5V nominal output
• Voltage - Output (Max): 36V maximum output rating
• Current - Output: 100mA output current capacity
• Tolerance: ±0.5% accuracy specification
• Current - Cathode: 1mA cathode current requirement

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount technology
• Package / Case: TO-236-3, SC-59, SOT-23-3 physical form factor
• Supplier Device Package: SOT-23 footprint

Compliance Criteria:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

The TL431KA-TP qualifies as a direct substitute based on full alignment with these parameters. Both devices share identical base product architecture (TL431 series), equivalent electrical specifications, and compatible physical packaging.

Parameter Comparison

Engineering Selection Recommendations

The TL431KA-TP is the qualified substitute for the obsolete TL431BU-TP based on the following engineering criteria:

Product Status Alignment: The TL431BU-TP carries Obsolete designation, indicating discontinued manufacturing and limited availability. The TL431KA-TP maintains Active product status with confirmed inventory of 1031 pieces in stock, ensuring supply chain continuity for new designs and production requirements.

Electrical Parameter Equivalence: Both devices operate within the TL431 shunt voltage reference architecture with identical output current capacity (100mA), maximum voltage rating (36V), and tolerance specification (±0.5%). The minimum output voltage differential (2.5V versus 2.495V) falls within the ±0.5% tolerance band and presents no functional incompatibility.

Compliance Certification: Both parts maintain ROHS3 Compliance and MSL Level 1 (Unlimited) moisture sensitivity ratings, satisfying regulatory and environmental requirements for equivalent deployment.

Operating Temperature Capability: The TL431KA-TP extends the operating temperature range to -40°C to 125°C, compared to the TL431BU-TP specification of 0°C to 70°C. This expanded range provides enhanced flexibility for applications requiring extended temperature operation while maintaining full compatibility within the original part's temperature envelope.

Physical Packaging Compatibility: Both devices utilize identical SOT-23 surface mount packaging (TO-236-3, SC-59, SOT-23-3), enabling direct board-level substitution without PCB redesign or layout modification.

Production Format: The TL431KA-TP is supplied in Tape & Reel (TR) format, the standard production packaging for high-volume manufacturing, whereas the TL431BU-TP was supplied in bulk packaging. This transition aligns with current industry manufacturing practices.

Frequently Asked Questions (FAQ)

Q: Can the TL431KA-TP directly replace the TL431BU-TP in existing designs?

A: Yes. The TL431KA-TP provides direct functional and physical substitution. Both devices share identical SOT-23 packaging, equivalent electrical specifications across all critical parameters (output voltage range, current capacity, tolerance), and compatible compliance certifications. No circuit modifications or PCB redesign is required.

Q: What is the significance of the voltage output difference (2.5V versus 2.495V)?

A: The 0.005V difference between the TL431BU-TP (2.5V) and TL431KA-TP (2.495V) represents a 0.2% variance, which falls within the ±0.5% tolerance specification common to both devices. This difference is electrically insignificant for circuit operation and does not constitute a compatibility limitation.

Q: Why does the TL431KA-TP have a wider operating temperature range?

A: The TL431KA-TP specifies -40°C to 125°C operation compared to the TL431BU-TP range of 0°C to 70°C. This extended range reflects the active product's design for broader industrial and commercial applications. The substitute remains fully compatible with designs constrained to the original 0°C to 70°C envelope.

Q: Are there packaging format differences between these parts?

A: The TL431BU-TP was supplied in bulk packaging, while the TL431KA-TP is supplied in Tape & Reel (TR) format. Both use identical SOT-23 surface mount footprints, ensuring PCB-level compatibility. The TR format is standard for production manufacturing and does not affect circuit performance or board assembly.

Q: What compliance certifications apply to the TL431KA-TP?

A: The TL431KA-TP maintains ROHS3 Compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, identical to the TL431BU-TP. Both devices carry EAR99 ECCN classification and 8542.39.0001 HTSUS code. The substitute additionally carries REACH Unaffected status.

Q: Is the TL431KA-TP the only available substitute?

A: Based on the provided substitute list, the TL431KA-TP is the identified equivalent part. Both devices share the TL431 base product number and are manufactured by Micro Commercial Co, confirming architectural equivalence within the manufacturer's product line.

Q: What is the current cathode specification and why is it important?

A: Both the TL431BU-TP and TL431KA-TP specify 1mA cathode current. This parameter defines the minimum operating current required at the cathode terminal for proper voltage reference operation. Identical specifications ensure circuit biasing compatibility.

Q: Can inventory status influence the substitution decision?

A: The TL431BU-TP is listed as Obsolete with 823 pieces in stock, while the TL431KA-TP is Active with 1031 pieces available. For new production and long-term supply assurance, the active TL431KA-TP is the appropriate selection. The TL431BU-TP inventory may be reserved for legacy system support only.