TL431ALP-BP Equivalent & Substitute Parts

Part Overview

The TL431ALP-BP is a programmable voltage reference IC manufactured by Micro Commercial Co, designed for power management applications. This device operates across a 2.5V to 36V output range with 100 mA output capability in a TO-92 through-hole package. The part is classified as obsolete, making identification of active equivalent components essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL431ALP-BP
Manufacturer	Micro Commercial Co
Category	Power Management (PMIC)
Base Product Number	TL431
Output Type	Programmable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	36V
Current - Output	100 mA
Voltage - Input	2.475V ~ 37V
Current - Cathode	1 mA
Operating Temperature	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
Supplier Device Package	TO-92
Product Status	Obsolete
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TL431ALP-BP is determined by the following critical parameters:

Electrical Compatibility Criteria:

Output voltage range: 2.5V to 36V minimum requirement
Output current capability: 100 mA minimum
Cathode current: 1 mA
Operating temperature range: 0°C to 70°C minimum coverage
Input voltage range compatibility

Mechanical Compatibility Criteria:

Package type: TO-92-3 (TO-226AA) through-hole configuration
Pin count and lead formation

Compliance Criteria:

RoHS compliance status
ECCN and HTSUS classifications

The TL431ACLPRAG from onsemi meets all electrical and mechanical substitution requirements while offering active product status and enhanced specifications.

Parameter Comparison

Parameter	TL431ALP-BP (Main Part)	TL431ACLPRAG (Substitute)
Manufacturer	Micro Commercial Co	onsemi
Base Product Number	TL431	TL431
Product Status	Obsolete	Active
Reference Type	Programmable	Shunt
Output Type	Programmable	Adjustable
Voltage - Output (Min/Fixed)	2.5V	2.495V
Voltage - Output (Max)	36V	36V
Current - Output	100 mA	100 mA
Current - Cathode	1 mA	1 mA
Tolerance	Not specified	±1%
Temperature Coefficient	Not specified	50ppm/°C Typical
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C (TA)
Mounting Type	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Supplier Device Package	TO-92	TO-92-3
RoHS Status	RoHS Compliant	ROHS3 Compliant
ECCN	EAR99	EAR99
HTSUS	8542.39.0001	8542.39.0001

Engineering Selection Recommendations

Primary Substitute: TL431ACLPRAG

The TL431ACLPRAG from onsemi is the qualified substitute for the obsolete TL431ALP-BP. Selection rationale:

Product Status: The TL431ACLPRAG maintains active product status, ensuring long-term availability and supply chain continuity compared to the obsolete main part.

Electrical Specifications: Both devices share identical output current (100 mA), cathode current (1 mA), and maximum output voltage (36V). The substitute's minimum output voltage of 2.495V is functionally equivalent to the main part's 2.5V specification within standard engineering tolerances.

Compliance: Both parts carry EAR99 ECCN classification and identical HTSUS codes (8542.39.0001). The TL431ACLPRAG meets ROHS3 compliance, exceeding the RoHS compliance of the main part.

Package Compatibility: Both devices utilize TO-92-3 (TO-226AA) through-hole packaging with identical pin configurations, enabling direct board-level substitution without layout modifications.

Enhanced Specifications: The TL431ACLPRAG provides ±1% tolerance and 50ppm/°C temperature coefficient specifications, offering improved performance characteristics over the main part where these parameters were not specified.

Frequently Asked Questions (FAQ)

Q: Can the TL431ACLPRAG directly replace the TL431ALP-BP on existing PCBs?

A: Yes. Both devices use identical TO-92-3 (TO-226AA) through-hole packaging with the same pin configuration. No PCB layout modifications are required for direct substitution.

Q: What is the functional difference between "Programmable" and "Adjustable" output types?

A: Both output types allow voltage adjustment through external resistor networks. The terminology reflects different manufacturer classifications for the same functional capability within the TL431 product family.

Q: Are there any electrical parameter differences that affect circuit operation?

A: The minimum output voltage differs by 0.005V (2.5V vs 2.495V), which is negligible for most applications. Output current, cathode current, and maximum voltage are identical. The substitute provides specified tolerance (±1%) and temperature coefficient (50ppm/°C), which were not specified for the main part.

Q: Why is the main part classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Micro Commercial Co. The TL431ACLPRAG from onsemi provides active manufacturing continuity for the TL431 product family.

Q: Are both parts RoHS compliant?

A: Yes. The main part is RoHS Compliant, and the substitute is ROHS3 Compliant, which represents an updated compliance standard.

Q: What is the moisture sensitivity level difference?

A: The main part specifies MSL 1 (Unlimited), while the substitute lists MSL as Not Applicable. Both designations indicate minimal moisture sensitivity for standard handling and storage conditions.

Q: Can the TL431ACLPRAG be used in new designs?

A: Yes. The active product status and enhanced specifications make it suitable for new design implementations requiring voltage reference functionality in the 2.5V to 36V range.

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