LT1004CLP-1-2 Equivalent & Substitute Parts

Part Overview

The LT1004CLP-1-2 is a shunt voltage reference IC manufactured by Texas Instruments, providing a fixed 1.235V output with ±0.32% tolerance. This part operates in the 0°C to 70°C temperature range and delivers 20 mA output current in a TO-92-3 package. The LT1004CLP-1-2 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.235V
Current - Output	20 mA
Tolerance	±0.32%
Temperature Coefficient	20ppm/°C Typical
Noise - 10Hz to 10kHz	60µVrms
Current - Cathode	10 µA
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the LT1004CLP-1-2 is determined by the following critical parameters:

Fixed output voltage of 1.235V
20 mA output current capability
TO-92-3 package configuration
Shunt reference topology
Through-hole mounting

Substitute parts are grouped into three categories based on their relationship to the original part:

Upgrade Parts (Enhanced specifications, active status): LM285BXZ-1.2/NOPB, LM285Z-1.2/NOPB, LT1004IZ-1.2#PBF

Manufacturer Recommended Parts (Active status, direct alternatives): LM385BXZ-1.2/NOPB, LM385BYZ-1.2/NOPB, LM385BZ-1.2/NOPB, LM385Z-1.2/NOPB, LM285Z-1.2G

Direct Substitutes (Equivalent or superior performance): LT1004CZ-1.2#PBF, LM385LP-1-2

All substitute parts maintain the 1.235V fixed output, 20 mA current rating, and TO-92-3 package. Tolerance and temperature coefficient specifications vary across substitutes, affecting precision and thermal stability requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Tolerance	Temp Coeff	Cathode Current	Operating Temp	Product Status
LT1004CLP-1-2	Texas Instruments	1.235V	±0.32%	20ppm/°C	10 µA	0°C ~ 70°C	Obsolete
LM285BXZ-1.2/NOPB	Texas Instruments	1.235V	±1%	30ppm/°C	10 µA	-40°C ~ 85°C	Active
LM285Z-1.2/NOPB	Texas Instruments	1.235V	±1%	150ppm/°C	10 µA	-40°C ~ 85°C	Active
LM385BXZ-1.2/NOPB	Texas Instruments	1.235V	±1%	30ppm/°C	15 µA	0°C ~ 70°C	Active
LM385BYZ-1.2/NOPB	National Semiconductor	1.235V	±1%	50ppm/°C	15 µA	0°C ~ 70°C	Active
LM385BZ-1.2/NOPB	Texas Instruments	1.235V	±1%	150ppm/°C	15 µA	0°C ~ 70°C	Active
LM385Z-1.2/NOPB	Texas Instruments	1.235V	-2.43%, +2.02%	150ppm/°C	15 µA	0°C ~ 70°C	Active
LM385LP-1-2	Texas Instruments	1.235V	±2%	20ppm/°C	15 µA	0°C ~ 70°C	Active
LT1004CZ-1.2#PBF	Analog Devices Inc.	1.235V	±0.3%	20ppm/°C	10 µA	0°C ~ 70°C	Active
LT1004IZ-1.2#PBF	Analog Devices Inc.	1.23V	±0.3%	20ppm/°C	10 µA	-40°C ~ 85°C	Active
LM285Z-1.2G	onsemi	1.235V	±1%	80ppm/°C	20 µA	-40°C ~ 85°C	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Operating Temperature Range):

LT1004CZ-1.2#PBF and LM385BXZ-1.2/NOPB are suitable direct replacements within the 0°C to 70°C operating range. Both maintain active product status and ROHS3 compliance. LT1004CZ-1.2#PBF offers superior tolerance (±0.3%) matching the original specification more closely.

For Extended Temperature Range Applications:

LM285BXZ-1.2/NOPB, LM285Z-1.2/NOPB, LT1004IZ-1.2#PBF, and LM285Z-1.2G support -40°C to 85°C operation, providing broader environmental coverage than the original part. All maintain active product status and ROHS3 compliance.

For Cost-Optimized Selection:

LM385LP-1-2 and LM385BZ-1.2/NOPB offer active status with lower tolerance specifications (±2% and ±1% respectively) suitable for applications where the original ±0.32% precision is not critical. Both are ROHS3 compliant and widely available.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the original part's regulatory status. Moisture sensitivity levels vary; Analog Devices parts (LT1004 series) maintain MSL 1 (Unlimited) classification identical to the original.

Frequently Asked Questions (FAQ)

Q: Can LM385BZ-1.2/NOPB replace LT1004CLP-1-2 directly?

A: Yes, LM385BZ-1.2/NOPB is a direct substitute. Both parts share the 1.235V output, 20 mA current rating, and TO-92-3 package. The LM385BZ-1.2/NOPB has ±1% tolerance versus the original ±0.32%, and 150ppm/°C temperature coefficient versus 20ppm/°C. Operating temperature ranges are identical (0°C to 70°C). Verify tolerance requirements before selection.

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

A: Both LM285 and LM385 series parts provide 1.235V fixed output in TO-92-3 packages. The primary differences are cathode current (LM285 draws 10 µA, LM385 draws 15 µA) and temperature coefficient specifications. LM285 variants typically offer lower temperature coefficients (30ppm/°C to 150ppm/°C), while LM385 variants range from 30ppm/°C to 150ppm/°C. Select based on power budget and thermal stability requirements.

Q: Is LT1004IZ-1.2#PBF compatible with the original part?

A: LT1004IZ-1.2#PBF is compatible with functional equivalence but differs in output voltage specification (1.23V versus 1.235V) and operating temperature range (-40°C to 85°C versus 0°C to 70°C). The tolerance (±0.3%) and temperature coefficient (20ppm/°C) closely match the original. Verify the 1.23V output voltage is acceptable for your application before substitution.

Q: Why do some substitutes have wider operating temperature ranges?

A: Extended temperature range variants (LM285BXZ-1.2/NOPB, LM285Z-1.2/NOPB, LT1004IZ-1.2#PBF, LM285Z-1.2G) are designed for industrial and automotive applications requiring -40°C to 85°C operation. These parts undergo additional qualification testing and typically command higher pricing. Select extended range parts only if your application requires operation outside the original 0°C to 70°C specification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant and REACH unaffected, matching the original LT1004CLP-1-2 regulatory status. Verify compliance documentation with your supplier for specific lot codes if required for regulated applications.

Q: What packaging options are available for substitutes?

A: All substitute parts maintain the TO-92-3 (TO-226-3) through-hole package configuration. Packaging formats vary by supplier (Bulk, Box, Bag) but do not affect electrical or mechanical compatibility. Select based on procurement quantity and supplier availability.

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