LM385BZ-2.5 Equivalent & Substitute Parts

Part Overview

The LM385BZ-2.5 is a shunt voltage reference IC that generates a fixed 2.5V output with ±1.5% tolerance. It is classified as a Power Management (PMIC) component and is packaged in TO-92-3 (TO-226) through-hole configuration. The main part is currently obsolete, with 5,136 pieces in stock. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	2.5V
Current - Output	20 mA
Tolerance	±1.5%
Noise - 10Hz to 10kHz	120µVrms
Current - Cathode	30 µA
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 Long Body
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the LM385BZ-2.5 is determined by the following critical parameters:

Output Voltage: 2.5V fixed output (all substitutes maintain this specification)
Output Current: 20 mA (all substitutes maintain this specification)
Tolerance: ±1.5% (all substitutes maintain this specification)
Reference Type: Shunt (all substitutes maintain this specification)
Package: TO-92-3 through-hole configuration (all substitutes use compatible TO-92-3 or TO-226-3 packages)
Noise Performance: 120µVrms at 10Hz to 10kHz (all substitutes maintain this specification)

Substitutes are grouped into two categories:

Direct Equivalents (Same Base Part Number - LM385 Series): Parts that share the LM385 base designation with identical electrical specifications and packaging. These include LM385BZ-2.5G, LM385BLP-2-5, LM385BLPE3-2-5, LM385BXZ-2.5/NOPB, and LM385BYZ-2.5/NOPB.

Similar Alternatives (LM285 Series): Parts that share the same electrical specifications and package but use the LM285 base designation. These include LM285BXZ-2.5/NOPB, LM285BYZ-2.5/NOPB, LM285LP-2-5, and LM285Z-2.5/NOPB. The LM285 series offers extended operating temperature ranges and improved temperature coefficients in some variants.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Output	Current Output	Tolerance	Temp Coeff (ppm/°C)	Cathode Current	Operating Temp	Package	RoHS Status
LM385BZ-2.5	onsemi	Obsolete	2.5V	20 mA	±1.5%	80	30 µA	0°C ~ 70°C	TO-92-3	Non-compliant
LM385BZ-2.5G	onsemi	Active	2.5V	20 mA	±1.5%	80	30 µA	0°C ~ 70°C	TO-92-3	ROHS3 Compliant
LM385BLP-2-5	Texas Instruments	Active	2.5V	20 mA	±1.5%	20	20 µA	0°C ~ 70°C	TO-92-3	ROHS3 Compliant
LM285BXZ-2.5/NOPB	National Semiconductor	Active	2.5V	20 mA	±1.5%	30	20 µA	-40°C ~ 85°C	TO-92-3	Not specified
LM285BYZ-2.5/NOPB	Texas Instruments	Active	2.5V	20 mA	±1.5%	50	20 µA	-40°C ~ 85°C	TO-92-3	ROHS3 Compliant
LM285LP-2-5	Texas Instruments	Active	2.5V	20 mA	±1.5%	20	20 µA	-40°C ~ 85°C	TO-92-3	ROHS3 Compliant
LM285Z-2.5/NOPB	Texas Instruments	Active	2.5V	20 mA	±1.5%	150	20 µA	-40°C ~ 85°C	TO-92-3	ROHS3 Compliant
LM385BLPE3-2-5	Texas Instruments	Active	2.5V	20 mA	±1.5%	20	20 µA	0°C ~ 70°C	TO-92-3	ROHS3 Compliant
LM385BXZ-2.5/NOPB	Texas Instruments	Active	2.5V	20 mA	±1.5%	30	20 µA	0°C ~ 70°C	TO-92-3	ROHS3 Compliant
LM385BYZ-2.5/NOPB	Texas Instruments	Active	2.5V	20 mA	±1.5%	50	20 µA	0°C ~ 70°C	TO-92-3	ROHS3 Compliant
LM385BZ-2.5/NOPB	National Semiconductor	Active	2.5V	20 mA	±1.5%	150	20 µA	0°C ~ 70°C	TO-92-3	Not specified

Engineering Selection Recommendations

For RoHS3 Compliant Applications: Select LM385BZ-2.5G, LM385BLP-2-5, LM385BLPE3-2-5, LM385BXZ-2.5/NOPB, LM385BYZ-2.5/NOPB, LM285BYZ-2.5/NOPB, or LM285LP-2-5. All are ROHS3 compliant and active products.

For Extended Temperature Range (-40°C to 85°C): Select LM285BXZ-2.5/NOPB, LM285BYZ-2.5/NOPB, or LM285LP-2-5. These parts support the wider operating temperature range compared to the original 0°C to 70°C specification.

For Standard Temperature Range (0°C to 70°C): Select LM385BZ-2.5G, LM385BLP-2-5, LM385BLPE3-2-5, LM385BXZ-2.5/NOPB, LM385BYZ-2.5/NOPB, or LM385BZ-2.5/NOPB. These maintain the original operating temperature specification.

For Improved Temperature Coefficient Performance: LM385BLP-2-5 and LM385BLPE3-2-5 offer 20 ppm/°C, superior to the original 80 ppm/°C specification. LM285LP-2-5 also provides 20 ppm/°C with extended temperature range.

For Direct Pin-Compatible Replacement: LM385BZ-2.5G is the direct active equivalent from onsemi, maintaining identical electrical specifications and packaging.

Frequently Asked Questions (FAQ)

Q: Can I use LM285 series parts as direct replacements for LM385BZ-2.5?

A: Yes. Both LM285 and LM385 series parts share identical output voltage (2.5V), output current (20 mA), tolerance (±1.5%), and package (TO-92-3). The primary differences are temperature coefficient and operating temperature range. LM285 variants offer extended operating temperature ranges (-40°C to 85°C) compared to the original 0°C to 70°C specification.

Q: What is the difference between the various LM385 package codes (BZ, BLP, BXZ, BYZ)?

A: These designations indicate different package and lead configurations within the TO-92-3 family. All maintain electrical compatibility with the LM385BZ-2.5. Selection depends on specific packaging requirements and availability. Consult manufacturer datasheets for detailed package specifications.

Q: Are all substitute parts RoHS compliant?

A: Most active substitutes are ROHS3 compliant. The original LM385BZ-2.5 is RoHS non-compliant. LM385BZ-2.5/NOPB and LM285BXZ-2.5/NOPB do not specify RoHS status. Verify compliance requirements for your application before selection.

Q: What is the significance of the temperature coefficient differences?

A: Temperature coefficient indicates how much the output voltage changes with temperature. Lower values (20 ppm/°C) provide better stability across temperature variations. The original part specifies 80 ppm/°C. Substitutes with 20 ppm/°C offer improved performance in temperature-sensitive applications.

Q: Can I use parts with extended temperature range (-40°C to 85°C) in applications requiring only 0°C to 70°C?

A: Yes. Extended temperature range parts are backward compatible with narrower temperature requirements. They provide additional operational margin and are suitable for any application within the 0°C to 70°C range.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging, confirming RoHS compliance. Parts without this designation may contain lead.

Q: Are there inventory considerations for selecting substitutes?

A: Yes. Inventory levels vary significantly. LM385BXZ-2.5/NOPB has the highest inventory (669,239 pieces), while LM385BYZ-2.5/NOPB has lower availability (1,122 pieces). Consider supply chain requirements when selecting alternatives.

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