REF1004I-1.2G4 Equivalent & Substitute Parts

Part Overview

The REF1004I-1.2G4 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 1.235V output with ±0.3% tolerance. This component is classified as a Power Management (PMIC) device and is packaged in an 8-SOIC form factor. The part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

REF1004I-1.2G4

Texas InstrumentsIn Stock: 1144REF1004I-1.2G4 Datasheet

Current PartRFQ

REF35120QDBVR

Texas InstrumentsIn Stock: 6517REF35120QDBVR Datasheet

MFR RecommendedRFQ

LT1004ID-1-2

Texas InstrumentsIn Stock: 12614LT1004ID-1-2 Datasheet

Parametric EquivalentRFQ

LT1004IS8-1.2#PBF

Analog Devices Inc.In Stock: 1578LT1004IS8-1.2#PBF Datasheet

DirectRFQ

LT1004IS8-1.2#TRPBF

Analog Devices Inc.In Stock: 2027LT1004IS8-1.2#TRPBF Datasheet

DirectRFQ

LT1004CS8-1.2#PBF

Analog Devices Inc.In Stock: 1401LT1004CS8-1.2#PBF Datasheet

MFR RecommendedRFQ

LT1004CS8-1.2#TRPBF

Analog Devices Inc.In Stock: 2291LT1004CS8-1.2#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the REF1004I-1.2G4 is determined by the following critical parameters:

Primary Substitution Criteria:

• Reference Type: Shunt (maintains circuit topology compatibility)
• Output Voltage: 1.235V (fixed output requirement)
• Output Current: 20 mA (load capability)
• Tolerance: ±0.3% (voltage accuracy specification)
• Temperature Coefficient: 20ppm/°C Typical (thermal stability)
• Package: 8-SOIC (physical and electrical footprint compatibility)
• Operating Temperature: -40°C ~ 85°C minimum (thermal operating range)

Substitute Categories:

Parametric Equivalents maintain identical electrical specifications and package form factor. These parts are direct functional replacements with matching performance characteristics.

Direct Manufacturer Alternatives are sourced from Analog Devices Inc. and provide equivalent electrical performance within the same package family, with minor variations in output voltage (1.23V vs 1.235V) that remain within acceptable tolerance bands for most applications.

MFR Recommended Alternatives from Analog Devices Inc. offer the same core specifications with different packaging options (Tube vs Tape & Reel) and temperature ranges (0°C ~ 70°C vs -40°C ~ 85°C).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select LT1004ID-1-2 from Texas Instruments. This part maintains active product status, identical output voltage (1.235V), matching tolerance (±0.32%, within specification margin), and full temperature range compatibility (-40°C ~ 85°C). The MSL rating of 1 (Unlimited) provides superior moisture handling compared to the original part's MSL 3 rating.

For Analog Devices Sourcing (Same Electrical Performance): LT1004IS8-1.2#PBF or LT1004IS8-1.2#TRPBF are functionally equivalent with output voltage of 1.23V (within ±0.3% tolerance band). Both maintain active product status and full temperature range operation. Select the Tape & Reel variant (#TRPBF) for high-volume production; select the Tube variant (#PBF) for lower-volume or prototype applications.

For Extended Temperature Range (Industrial Applications): REF35120QDBVR offers superior specifications with ±0.05% tolerance and extended operating temperature to 125°C. However, this is a series reference (not shunt) in SOT-23-6 package, requiring circuit topology verification before substitution.

For Constrained Temperature Range (Commercial Applications): LT1004CS8-1.2#PBF or LT1004CS8-1.2#TRPBF operate within 0°C ~ 70°C, suitable for commercial-grade applications. Both maintain 1.235V output and ±0.3% tolerance. Select based on packaging requirement (Tube or Tape & Reel).

All recommended substitutes are ROHS3 compliant and carry REACH Unaffected status, matching the original part's regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can LT1004IS8-1.2#PBF replace REF1004I-1.2G4 directly? A: Yes. Both are shunt references in 8-SOIC packages with 1.23V/1.235V output (within ±0.3% tolerance), 20 mA output current, and -40°C ~ 85°C operating range. The output voltage difference (1.23V vs 1.235V) is within the tolerance specification and does not affect circuit functionality in most applications.

Q: What is the difference between Tube and Tape & Reel packaging? A: Tube packaging is suitable for lower-volume orders and prototype builds. Tape & Reel packaging is optimized for automated assembly and high-volume production. Electrical specifications are identical; selection depends on manufacturing process requirements.

Q: Why is REF35120QDBVR listed as a substitute if it has a different package? A: REF35120QDBVR is classified as a manufacturer-recommended alternative due to superior electrical specifications (±0.05% tolerance, 12ppm/°C temperature coefficient, extended temperature range to 125°C). However, it is a series reference in SOT-23-6 package, requiring circuit redesign. This option is suitable only for applications where circuit topology can be modified.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 Compliant status and REACH Unaffected designation, matching the original part's regulatory compliance profile.

Q: What is the MSL rating difference, and does it matter? A: The original REF1004I-1.2G4 has MSL 3 (168 Hours); substitute parts have MSL 1 (Unlimited). MSL 1 indicates superior moisture resistance and longer shelf life without baking requirements. This is a beneficial upgrade for storage and handling.

Q: Can I use LT1004CS8-1.2 variants if my application requires -40°C operation? A: No. LT1004CS8-1.2 variants operate only within 0°C ~ 70°C range. For full -40°C ~ 85°C operation, select LT1004ID-1-2 or LT1004IS8-1.2 variants.