LM385Z-1.2 Equivalent & Substitute Parts

Part Overview

The LM385Z-1.2 is a shunt voltage reference IC manufactured by onsemi, providing a fixed 1.235V output with -2.4%, +2.01% tolerance and 20 mA output current in a TO-92-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The LM385Z-1.2 serves as a precision voltage reference in power management applications requiring stable reference voltages across industrial temperature ranges.

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	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the LM385Z-1.2 are classified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Reference Type: Shunt
Output Type: Fixed
Voltage - Output: 1.235V
Current - Output: 20 mA
Package / Case: TO-92-3 or TO-226-3
Mounting Type: Through Hole

Direct Substitutes maintain identical electrical specifications and packaging, differing only in manufacturer, product status, or compliance certifications. These parts are pin-compatible and functionally interchangeable without circuit modification.

Similar Substitutes share the same output voltage and reference type but may differ in tolerance, temperature coefficient, cathode current, or operating temperature range. These parts require design verification to confirm compatibility with application requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Current Output	Tolerance	Temp Coeff	Cathode Current	Operating Temp	Package	Product Status	RoHS Status
LM385Z-1.2	onsemi	1.235V	20 mA	-2.4%, +2.01%	80ppm/°C	20 µA	0°C ~ 70°C	TO-92-3	Obsolete	RoHS non-compliant
LM385Z-1.2G	onsemi	1.235V	20 mA	-2.4%, +2.01%	80ppm/°C	20 µA	0°C ~ 70°C	TO-92-3	Active	ROHS3 Compliant
LM385BZ-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	150ppm/°C	15 µA	0°C ~ 70°C	TO-92-3	Active	ROHS3 Compliant
LM385LP-1-2	Texas Instruments	1.235V	20 mA	±2%	20ppm/°C	15 µA	0°C ~ 70°C	TO-92-3	Active	ROHS3 Compliant
LM285BXZ-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	30ppm/°C	10 µA	-40°C ~ 85°C	TO-92-3	Active	ROHS3 Compliant
LM285Z-1.2/NOPB	Texas Instruments	1.235V	20 mA	±1%	150ppm/°C	10 µA	-40°C ~ 85°C	TO-92-3	Active	ROHS3 Compliant
LM285Z-1.2#PBF	Analog Devices Inc.	1.235V	20 mA	±1%	20ppm/°C	10 µA	-40°C ~ 85°C	TO-92-3	Active	ROHS3 Compliant
LM385BLP-1-2	Texas Instruments	1.235V	20 mA	±1%	20ppm/°C	15 µA	0°C ~ 70°C	TO-92-3	Active	ROHS3 Compliant
LM385BLPE3-1-2	Texas Instruments	1.235V	20 mA	±1%	20ppm/°C	15 µA	0°C ~ 70°C	TO-92-3	Active	ROHS3 Compliant
LT1004CZ-1.2#PBF	Analog Devices Inc.	1.235V	20 mA	±0.3%	20ppm/°C	10 µA	0°C ~ 70°C	TO-92-3	Active	ROHS3 Compliant
AD589JH	Analog Devices Inc.	1.235V	5 mA	-2.83%, +1.22%	100ppm/°C	50 µA	0°C ~ 70°C	TO-51-2	Active	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Direct Substitutes (Pin-Compatible, Identical Specifications):

LM385Z-1.2G is the primary direct substitute, offering identical electrical specifications and TO-92-3 packaging with active product status and ROHS3 compliance. This part provides the most straightforward replacement path for obsolete LM385Z-1.2 inventory.

Recommended Active Substitutes (Same Output Voltage and Current, Verified Compatibility):

LM385BZ-1.2/NOPB and LM385LP-1-2 from Texas Instruments are active alternatives with identical 1.235V output and 20 mA current specifications. Both maintain TO-92-3 packaging and 0°C ~ 70°C operating temperature range. LM385BZ-1.2/NOPB offers ±1% tolerance with 150ppm/°C temperature coefficient. LM385LP-1-2 provides ±2% tolerance with superior 20ppm/°C temperature coefficient, suitable for applications requiring lower temperature drift.

LM285BXZ-1.2/NOPB and LM285Z-1.2/NOPB extend operating temperature to -40°C ~ 85°C, supporting wider industrial applications. Both maintain 1.235V output and 20 mA current with ±1% tolerance and TO-92-3 packaging. LM285BXZ-1.2/NOPB features 30ppm/°C temperature coefficient with 10 µA cathode current. LM285Z-1.2/NOPB provides 150ppm/°C temperature coefficient with 10 µA cathode current.

LM285Z-1.2#PBF from Analog Devices Inc. combines -40°C ~ 85°C operating range with ±1% tolerance and 20ppm/°C temperature coefficient, offering superior temperature stability across extended industrial temperature ranges.

LT1004CZ-1.2#PBF provides the tightest tolerance specification at ±0.3% with 20ppm/°C temperature coefficient, suitable for precision reference applications requiring enhanced accuracy.

Compliance Considerations:

All recommended active substitutes carry ROHS3 compliance certification, addressing regulatory requirements for new designs. The original LM385Z-1.2 is RoHS non-compliant and obsolete, necessitating transition to compliant alternatives.

Limited Compatibility:

AD589JH differs significantly in output current (5 mA versus 20 mA) and package type (TO-51-2 metal can versus TO-92-3), requiring circuit redesign and is not recommended as a direct substitute.

Frequently Asked Questions (FAQ)

Q: Can LM385Z-1.2G directly replace LM385Z-1.2 without circuit modification?

A: Yes. LM385Z-1.2G maintains identical electrical specifications (1.235V output, 20 mA current, -2.4%, +2.01% tolerance, 80ppm/°C temperature coefficient) and TO-92-3 packaging. The primary difference is active product status and ROHS3 compliance. Pin-for-pin substitution is valid.

Q: What is the difference between LM385 and LM285 series parts?

A: Both series provide 1.235V fixed shunt voltage references with 20 mA output current and TO-92-3 packaging. LM285 series extends operating temperature to -40°C ~ 85°C compared to LM385 series at 0°C ~ 70°C. LM285 series typically features lower cathode current (10 µA) and improved temperature coefficients. Selection depends on application temperature requirements.

Q: Why does LM385LP-1-2 have lower temperature coefficient than LM385BZ-1.2/NOPB?

A: Temperature coefficient is a specified parameter determined by the manufacturer's design and process. LM385LP-1-2 achieves 20ppm/°C typical versus LM385BZ-1.2/NOPB at 150ppm/°C. Applications requiring minimal voltage drift across temperature ranges should prioritize lower temperature coefficient specifications.

Q: Is AD589JH compatible with LM385Z-1.2 applications?

A: No. AD589JH differs in critical parameters: 5 mA output current (versus 20 mA), TO-51-2 metal can package (versus TO-92-3), and different tolerance specification (-2.83%, +1.22%). These differences require circuit redesign and are not recommended for direct substitution.

Q: What compliance certifications should new designs prioritize?

A: ROHS3 compliance is mandatory for new designs. All recommended active substitutes carry ROHS3 certification. The original LM385Z-1.2 is RoHS non-compliant and obsolete, making transition to compliant alternatives necessary for regulatory compliance.

Q: How do tolerance specifications affect component selection?

A: Tolerance defines the acceptable voltage output range. LM385Z-1.2 specifies -2.4%, +2.01% asymmetric tolerance. LT1004CZ-1.2#PBF offers ±0.3% symmetric tolerance for precision applications. LM385LP-1-2 provides ±2% tolerance. Application accuracy requirements determine appropriate tolerance selection.

Q: Can parts with different operating temperature ranges be substituted?

A: Only if the application operates within the substitute part's temperature range. LM285 series (-40°C ~ 85°C) can replace LM385 series (0°C ~ 70°C) in applications operating within 0°C ~ 70°C. Conversely, LM385 series cannot replace LM285 series in applications requiring -40°C ~ 85°C operation.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message