LM385Z-1.2G Equivalent & Substitute Parts

Part Overview

The LM385Z-1.2G is a shunt voltage reference IC manufactured by onsemi, delivering a fixed 1.235V output with -2.4%, +2.01% tolerance. This Through Hole component operates across 0°C to 70°C and is classified as Active product status. Shunt voltage references are essential in precision analog circuits requiring stable reference voltages for analog-to-digital converters, comparators, and regulated power supplies. Alternative models become necessary when design requirements demand tighter tolerance specifications, extended temperature ranges, or different thermal characteristics.

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 Long Body
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Reference Type: Must be Shunt
Output Type: Must be Fixed
Voltage - Output (Min/Fixed): Must be 1.235V or 1.23V (within acceptable tolerance band)
Current - Output: Must be 20 mA
Package / Case: Must be TO-226-3 or TO-92-3 compatible
Mounting Type: Must be Through Hole
RoHS Status: Must be ROHS3 Compliant

Substitute parts are grouped into two categories: Direct Manufacturer Substitutes (identical tolerance and temperature range) and Similar Manufacturer Parts (tighter tolerance or extended temperature range). All listed substitutes maintain electrical compatibility through identical output voltage, current rating, and package configuration.

Parameter Comparison

Part Number	Manufacturer	Tolerance	Temperature Coefficient	Operating Temperature	Current - Cathode	Inventory (Pcs)
LM385Z-1.2G	onsemi	-2.4%, +2.01%	80ppm/°C Typical	0°C ~ 70°C	20 µA	2596
LM385LP-1-2	Texas Instruments	±2%	20ppm/°C Typical	0°C ~ 70°C	15 µA	1275
LM285BXZ-1.2/NOPB	Texas Instruments	±1%	30ppm/°C	-40°C ~ 85°C	10 µA	12900
LM285Z-1.2#PBF	Analog Devices Inc.	±1%	20ppm/°C Typical	-40°C ~ 85°C	10 µA	965
LM285Z-1.2/NOPB	Texas Instruments	±1%	150ppm/°C	-40°C ~ 85°C	10 µA	72762
LM385BLP-1-2	Texas Instruments	±1%	20ppm/°C Typical	0°C ~ 70°C	15 µA	20023
LM385BLPE3-1-2	Texas Instruments	±1%	20ppm/°C Typical	0°C ~ 70°C	15 µA	3584
LT1004CZ-1.2#PBF	Analog Devices Inc.	±0.3%	20ppm/°C Typical	0°C ~ 70°C	10 µA	1553
LT1004IZ-1.2#PBF	Analog Devices Inc.	±0.3%	20ppm/°C Typical	-40°C ~ 85°C	10 µA	1600

Engineering Selection Recommendations

Direct Manufacturer Substitute (Identical Operating Range): LM385LP-1-2 operates within the same 0°C to 70°C temperature range as the LM385Z-1.2G. This part offers improved tolerance (±2% versus -2.4%, +2.01%) and lower temperature coefficient (20ppm/°C versus 80ppm/°C), making it suitable for designs requiring enhanced stability within the original thermal envelope.

Enhanced Performance Substitutes (Extended Temperature Range): LM285BXZ-1.2/NOPB, LM285Z-1.2#PBF, and LM285Z-1.2/NOPB extend operating temperature to -40°C to 85°C while delivering ±1% tolerance. These parts are appropriate for applications requiring wider temperature operation and tighter voltage accuracy.

Premium Tolerance Substitutes (Highest Accuracy): LT1004CZ-1.2#PBF and LT1004IZ-1.2#PBF provide ±0.3% tolerance with 20ppm/°C temperature coefficient. LT1004IZ-1.2#PBF additionally supports -40°C to 85°C operation. These components address precision applications demanding superior voltage stability.

Intermediate Performance Substitutes (0°C to 70°C Range): LM385BLP-1-2 and LM385BLPE3-1-2 maintain the original temperature range while offering ±1% tolerance and 20ppm/°C temperature coefficient, representing balanced performance improvement.

All substitute parts maintain ROHS3 compliance and Through Hole TO-92-3 packaging compatibility with the LM385Z-1.2G.

Frequently Asked Questions (FAQ)

Q: Can I use LM285BXZ-1.2/NOPB as a direct replacement for LM385Z-1.2G? A: Yes. Both parts deliver 1.235V fixed output at 20 mA with TO-92-3 Through Hole packaging. LM285BXZ-1.2/NOPB provides superior tolerance (±1% versus -2.4%, +2.01%) and extends operating temperature to -40°C to 85°C. No circuit modifications are required.

Q: What is the difference between LM385LP-1-2 and LM385BLP-1-2? A: Both are Texas Instruments LM385 series parts with ±1% tolerance and 20ppm/°C temperature coefficient operating across 0°C to 70°C. The primary distinction is packaging designation; both are electrically equivalent and pin-compatible.

Q: Why would I choose LT1004CZ-1.2#PBF over LM385Z-1.2G? A: LT1004CZ-1.2#PBF delivers ±0.3% tolerance compared to -2.4%, +2.01%, and maintains 20ppm/°C temperature coefficient. Selection depends on precision requirements; applications demanding voltage accuracy better than ±1% benefit from the LT1004 series.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 Compliant certification, matching the LM385Z-1.2G environmental compliance status.

Q: Can I use parts with extended temperature range (-40°C to 85°C) in a 0°C to 70°C application? A: Yes. Extended temperature range parts operate correctly within narrower temperature bands. No performance degradation occurs when using -40°C to 85°C rated components in 0°C to 70°C applications.

Q: What is the significance of cathode current differences between parts? A: Cathode current (10 µA to 20 µA) represents the minimum operating current. Lower cathode current reduces power dissipation. Both values are compatible with standard shunt reference circuit topologies; selection depends on specific bias network design.

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