LM336Z25X Equivalent & Substitute Parts

Part Overview

The LM336Z25X is a shunt voltage reference IC manufactured by onsemi, providing a fixed 2.5V output with ±2% tolerance in a TO-92-3 package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Shunt voltage reference ICs are fundamental building blocks in precision analog circuits, power supply designs, and measurement systems where stable reference voltages are required.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM336Z25X
Manufacturer	onsemi
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Tolerance	±2%
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LM336Z25X is determined by the following critical parameters:

Reference Type: Must be Shunt
Output Type: Must be Fixed
Voltage Output: 2.5V nominal (acceptable range 2.49V to 2.5V based on tolerance specifications)
Tolerance: ±2% or better (±2%, ±0.48% acceptable; ±4% not recommended for direct substitution)
Package: TO-92-3 (TO-226-3, TO-226AA Formed Leads)
Mounting Type: Through Hole
Operating Temperature Range: 0°C ~ 70°C (TA)
RoHS Compliance: ROHS3 Compliant

Substitute parts are grouped into two categories:

Direct Substitutes (±2% Tolerance): Parts meeting the exact tolerance specification of the original component, ensuring drop-in compatibility without circuit redesign.

Compatible Alternatives (±0.48% Tolerance): Parts with superior tolerance performance, suitable for applications requiring higher precision. These provide enhanced accuracy while maintaining electrical and mechanical compatibility.

Similar Parts (±4% Tolerance): Parts with relaxed tolerance specifications. These are listed for reference but require circuit evaluation before substitution, as the wider tolerance may affect system performance.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Tolerance	Current Output	Product Status	Packaging	RoHS Status
LM336Z25X	onsemi	2.5V	±2%	—	Obsolete	TO-92-3	ROHS3 Compliant
LM336BLPR-2-5	Texas Instruments	2.49V	±2%	10 mA	Active	TO-92-3	ROHS3 Compliant
LM336BZ-2.5/LFT7	Texas Instruments	2.49V	±2%	10 mA	Active	TO-92-3	ROHS3 Compliant
LM336Z-2.5#TRPBF	Analog Devices Inc.	2.49V	±0.48%	15 mA	Active	TO-92-3	ROHS3 Compliant
LM336LPR-2-5	Texas Instruments	2.49V	±4%	10 mA	Active	TO-92-3	ROHS3 Compliant
LM336LPE3-2-5	Texas Instruments	2.49V	±4%	10 mA	Obsolete	TO-92-3	ROHS3 Compliant
LM336Z-2.5/LFT1	Texas Instruments	2.49V	±4%	10 mA	Active	TO-92-3	ROHS3 Compliant
LM336Z-2.5/LFT3	National Semiconductor	2.49V	±4%	10 mA	Active	TO-92-3	Not Specified
LM336Z-2.5/LFT7	Texas Instruments	2.49V	±4%	10 mA	Active	TO-92-3	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

LM336BLPR-2-5 and LM336BZ-2.5/LFT7 are the preferred substitutes for the LM336Z25X. Both are manufactured by Texas Instruments, maintain the ±2% tolerance specification, operate within the 0°C to 70°C temperature range, and are ROHS3 compliant. Both parts are in active production status, ensuring long-term availability. The LM336BLPR-2-5 is supplied in Tape & Reel packaging, while LM336BZ-2.5/LFT7 is supplied in Cut Tape format. Selection between these two depends on procurement and assembly requirements.

Enhanced Performance Alternative

LM336Z-2.5#TRPBF, manufactured by Analog Devices Inc., offers superior tolerance performance at ±0.48%, making it suitable for applications requiring higher precision reference accuracy. This part is in active production and ROHS3 compliant. The enhanced tolerance comes with increased output current capability (15 mA versus 10 mA), providing additional design flexibility. This part is recommended when circuit performance benefits from tighter voltage reference accuracy.

Alternative Options (Conditional Use)

LM336LPR-2-5 and LM336Z-2.5/LFT1, LM336Z-2.5/LFT3, and LM336Z-2.5/LFT7 are available with ±4% tolerance. These parts are suitable only for applications where the wider tolerance specification does not compromise system performance. Circuit evaluation is required before substitution. LM336LPE3-2-5 is obsolete and should not be selected for new designs despite active inventory availability.

Frequently Asked Questions (FAQ)

Q: Can I substitute the LM336Z25X with any of the listed parts?

A: Direct substitution without circuit modification is limited to parts matching the ±2% tolerance specification: LM336BLPR-2-5 and LM336BZ-2.5/LFT7. Parts with ±4% tolerance require circuit evaluation to confirm acceptable performance. The LM336Z-2.5#TRPBF with ±0.48% tolerance is a superior alternative suitable for all applications where the original part was used.

Q: What is the difference between the packaging options?

A: Tape & Reel (TR) packaging is used for automated assembly processes and high-volume production. Cut Tape (CT) packaging is suitable for lower-volume applications and manual assembly. Both formats contain identical components; selection depends on manufacturing process requirements.

Q: Is the LM336Z-2.5#TRPBF a direct replacement?

A: Yes. The LM336Z-2.5#TRPBF is electrically and mechanically compatible with the LM336Z25X. It provides superior tolerance performance (±0.48% versus ±2%), higher output current (15 mA versus unspecified), and is in active production. No circuit modifications are required.

Q: Why are some substitute parts obsolete?

A: LM336LPE3-2-5 is listed as obsolete but remains in inventory. Obsolete parts should not be selected for new designs due to uncertain future availability. Active production parts (LM336BLPR-2-5, LM336BZ-2.5/LFT7, LM336Z-2.5#TRPBF) are recommended for design continuity.

Q: Does tolerance affect my circuit design?

A: Tolerance directly affects reference voltage accuracy. The original ±2% specification allows output voltage variation of ±50 mV around the 2.5V nominal. Substitutes with ±4% tolerance allow ±100 mV variation. If your circuit requires tighter accuracy, select parts with ±2% or better tolerance, or evaluate circuit performance impact before using ±4% parts.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitutes are ROHS3 compliant. LM336Z-2.5/LFT3 (National Semiconductor) does not specify RoHS status in available documentation. Verify RoHS compliance with the supplier before procurement if this is a requirement for your application.

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