LM385Z-1.2RP Equivalent & Substitute Parts

Part Overview

The LM385Z-1.2RP is a shunt voltage reference IC manufactured by onsemi, delivering a fixed 1.235V output with ±2.4%/+2.01% tolerance and 20 mA output current capability. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across 0°C to 70°C and is packaged in TO-92-3 through-hole configuration.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.235V
Current - Output	20 mA
Tolerance	-2.4%, +2.01%
Temperature Coefficient	80ppm/°C Typical
Noise - 10Hz to 10kHz	60µVrms
Current - Cathode	20 µA
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Substitute Part Grouping Explanation

Substitution for the LM385Z-1.2RP is determined by the following critical parameters:

Output Voltage: 1.235V fixed (all substitutes maintain this specification)
Output Current: 20 mA (all substitutes support this rating)
Package Type: TO-92-3 through-hole (all substitutes use identical package)
Reference Type: Shunt configuration (all substitutes maintain this topology)
Operating Temperature Range: Minimum 0°C to 70°C support required

Substitute parts are grouped into two categories:

Direct Equivalents maintain the same tolerance specification (-2.4%, +2.01%) and are pin-compatible replacements with identical electrical performance.

Compatible Alternatives offer improved specifications (tighter tolerance ±1% to ±2%, lower temperature coefficient, extended temperature range) while maintaining electrical and mechanical compatibility. These parts can replace the LM385Z-1.2RP in applications where enhanced performance is acceptable.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Tolerance	Temp Coeff	Cathode Current	Operating Temp	Product Status	RoHS Status
LM385Z-1.2RP	onsemi	1.235V	-2.4%, +2.01%	80ppm/°C	20 µA	0°C ~ 70°C	Obsolete	RoHS non-compliant
LM385Z-1.2RPG	onsemi	1.235V	-2.4%, +2.01%	80ppm/°C	20 µA	0°C ~ 70°C	Active	ROHS3 Compliant
LM385LPR-1-2	Texas Instruments	1.235V	±2%	20ppm/°C	15 µA	0°C ~ 70°C	Active	ROHS3 Compliant
LM385LPRE3-1-2	Texas Instruments	1.235V	±2%	20ppm/°C	15 µA	0°C ~ 70°C	Active	ROHS3 Compliant
LM385Z-1.2/LFT3	Texas Instruments	1.235V	-2.43%, +2.02%	150ppm/°C	15 µA	0°C ~ 70°C	Active	ROHS3 Compliant
LM385Z-1.2/LFT4	National Semiconductor	1.235V	-2.43%, +2.02%	150ppm/°C	15 µA	0°C ~ 70°C	Active	Not specified
LM285BXZ-1.2/LFT4	National Semiconductor	1.235V	±1%	30ppm/°C	10 µA	-40°C ~ 85°C	Active	Not specified
LM285LPRE3-1-2	Texas Instruments	1.235V	±1%	20ppm/°C	10 µA	-40°C ~ 85°C	Active	ROHS3 Compliant
LM285Z-1.2#TRPBF	Analog Devices Inc.	1.235V	±1%	20ppm/°C	10 µA	-40°C ~ 85°C	Active	ROHS3 Compliant
LM385BLPR-1-2	Texas Instruments	1.235V	±1%	20ppm/°C	15 µA	0°C ~ 70°C	Active	ROHS3 Compliant
LM385BLPRE3-1-2	Texas Instruments	1.235V	±1%	20ppm/°C	15 µA	0°C ~ 70°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Direct Equivalent: LM385Z-1.2RPG (onsemi) is the direct successor to the LM385Z-1.2RP. It maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. This part is the preferred replacement for obsolete stock management.

Secondary Direct Equivalents: LM385Z-1.2/LFT3 and LM385Z-1.2/LFT4 provide equivalent tolerance performance (-2.43%, +2.02%) with active status. Both are suitable for direct substitution in applications where the original tolerance band is required.

Compatible Alternatives with Enhanced Performance: LM385LPR-1-2 and LM385LPRE3-1-2 (Texas Instruments) offer tighter tolerance (±2%) and improved temperature coefficient (20ppm/°C vs. 80ppm/°C) while maintaining the 0°C to 70°C operating range. These parts are ROHS3 compliant and recommended for new designs requiring better stability.

High-Precision Alternatives: LM285LPRE3-1-2 (Texas Instruments), LM285Z-1.2#TRPBF (Analog Devices), LM385BLPR-1-2, and LM385BLPRE3-1-2 (Texas Instruments) provide ±1% tolerance with superior temperature coefficients (20ppm/°C to 30ppm/°C). These parts support extended temperature range (-40°C to 85°C) and are suitable for applications requiring precision voltage reference performance. All are ROHS3 compliant.

All substitute parts maintain TO-92-3 through-hole packaging and 1.235V fixed output voltage, ensuring mechanical and electrical compatibility with the original LM385Z-1.2RP design.

Frequently Asked Questions (FAQ)

Q: Can LM385Z-1.2RPG directly replace LM385Z-1.2RP without circuit modification? A: Yes. LM385Z-1.2RPG is electrically and mechanically identical to LM385Z-1.2RP, with the same tolerance, output voltage, and package. The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between LM385 and LM285 series parts? A: Both series deliver 1.235V fixed output in TO-92-3 packages. The LM285 series offers tighter tolerance (±1%) and lower temperature coefficient (20ppm/°C to 30ppm/°C) compared to LM385 variants. LM285 parts support extended operating temperature range (-40°C to 85°C) versus the standard 0°C to 70°C range.

Q: Are Texas Instruments and National Semiconductor parts interchangeable? A: Yes, for the specified electrical parameters. LM385Z-1.2/LFT3 (Texas Instruments) and LM385Z-1.2/LFT4 (National Semiconductor) both deliver -2.43%, +2.02% tolerance and 150ppm/°C temperature coefficient. Pin configuration and package are identical.

Q: Which substitute offers the best temperature stability? A: LM285LPRE3-1-2 (Texas Instruments) and LM285Z-1.2#TRPBF (Analog Devices) both provide 20ppm/°C temperature coefficient, the lowest among available substitutes. Both support -40°C to 85°C operating range and ±1% tolerance.

Q: Is RoHS compliance required for my application? A: If RoHS3 compliance is mandatory, select from: LM385Z-1.2RPG, LM385LPR-1-2, LM385LPRE3-1-2, LM385Z-1.2/LFT3, LM285LPRE3-1-2, LM285Z-1.2#TRPBF, LM385BLPR-1-2, or LM385BLPRE3-1-2. The original LM385Z-1.2RP is RoHS non-compliant.

Q: What packaging options are available? A: All substitute parts use TO-92-3 through-hole package with formed leads. Packaging formats vary (Cut Tape, Bulk, Tape & Reel) but do not affect electrical or mechanical compatibility. Select based on procurement and assembly requirements.

Q: Can I use a higher-precision part (±1% tolerance) as a drop-in replacement? A: Yes. Higher-precision parts (LM285 series, LM385BL series) are backward-compatible with the LM385Z-1.2RP. The tighter tolerance and improved temperature coefficient provide enhanced performance without requiring circuit redesign.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message