REF1004C-1.2 Equivalent & Substitute Parts

Part Overview

The REF1004C-1.2 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 1.235V output with ±0.3% tolerance. Classified as a Power Management (PMIC) component, this 8-SOIC surface mount device operates across 0°C to 70°C and supports 20 mA output current. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring shunt voltage reference functionality.

Substiute Parts

REF1004C-1.2

Texas InstrumentsIn Stock: 5830REF1004C-1.2 Datasheet

Current PartRFQ

REF35120QDBVR

Texas InstrumentsIn Stock: 6517REF35120QDBVR Datasheet

MFR RecommendedRFQ

LT1004CD-1-2

Texas InstrumentsIn Stock: 3719LT1004CD-1-2 Datasheet

Parametric EquivalentRFQ

LT1004CS8-1.2#TRPBF

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

DirectRFQ

LT1004IS8-1.2#PBF

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

UpgradeRFQ

LT1004IS8-1.2#TRPBF

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

UpgradeRFQ

LT1004CS8-1.2#PBF

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the REF1004C-1.2 are categorized based on the following substitution criteria:

Direct Substitutes maintain identical electrical and mechanical specifications: reference type (shunt), output voltage (1.235V), output current (20 mA), tolerance (±0.3%), temperature coefficient (20ppm/°C), noise characteristics (60µVrms), package (8-SOIC), and operating temperature range (0°C ~ 70°C).

Parametric Equivalents share the same reference type, output voltage, output current, tolerance, and package but may differ in operating temperature range, moisture sensitivity level, or product status while maintaining functional compatibility.

Upgrade Substitutes provide extended operating temperature ranges (-40°C ~ 85°C) compared to the original part, enabling use in wider environmental conditions while maintaining core electrical specifications (shunt reference, 1.23V output, 20 mA, ±0.3% tolerance, 8-SOIC package).

MFR Recommended Alternatives represent a different reference architecture (series instead of shunt) with superior performance characteristics including lower tolerance (±0.05%), lower temperature coefficient (12ppm/°C), and extended operating range (-40°C ~ 125°C), suitable for applications where enhanced precision is required.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Operating Conditions): Select LT1004CS8-1.2#TRPBF or LT1004CS8-1.2#PBF from Analog Devices Inc. Both parts maintain identical electrical specifications (1.235V, ±0.3%, 20ppm/°C, 60µVrms noise) and 8-SOIC packaging. These are Active status products with unlimited moisture sensitivity rating, ensuring long-term availability and reliability.

For Extended Temperature Range Applications: Select LT1004IS8-1.2#PBF or LT1004IS8-1.2#TRPBF. These upgrade substitutes extend the operating temperature range to -40°C ~ 85°C while maintaining shunt reference architecture and core electrical performance. Output voltage is 1.23V (within acceptable tolerance variance for shunt references).

For Parametric Equivalence with Texas Instruments Supply: Select LT1004CD-1-2. This part provides Active status with identical package and operating temperature range. Tolerance is ±0.32% (marginally relaxed from ±0.3%), acceptable for applications with standard precision requirements.

For Enhanced Precision Applications: Select REF35120QDBVR. This MFR recommended alternative employs series reference architecture with superior performance: ±0.05% tolerance, 12ppm/°C temperature coefficient, and extended operating range (-40°C ~ 125°C). Package differs (SOT-23-6), requiring PCB layout modification. This selection is appropriate only when precision requirements exceed shunt reference capabilities.

All recommended substitutes maintain ROHS3 compliance and EAR99 export classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can LT1004CD-1-2 directly replace REF1004C-1.2 in existing designs?

A: Yes. LT1004CD-1-2 is a parametric equivalent with identical package (8-SOIC), reference type (shunt), output voltage (1.235V), output current (20 mA), and operating temperature range (0°C ~ 70°C). Tolerance is ±0.32% versus ±0.3%, a negligible difference for most applications. No circuit modifications are required.

Q: What is the difference between LT1004CS8-1.2#TRPBF and LT1004CS8-1.2#PBF?

A: Both parts are electrically identical. The difference is packaging format: #TRPBF indicates Tape & Reel (TR) packaging for automated assembly, while #PBF indicates Tube packaging for manual handling. Select based on your assembly process requirements.

Q: Can I use LT1004IS8-1.2 in place of REF1004C-1.2?

A: Yes, with considerations. LT1004IS8-1.2 provides an upgrade path with extended operating temperature (-40°C ~ 85°C versus 0°C ~ 70°C). Output voltage is 1.23V instead of 1.235V; this 5mV difference is within acceptable tolerance for shunt reference applications. No circuit modifications are required.

Q: Why is REF35120QDBVR listed as an alternative if it uses a different package?

A: REF35120QDBVR is a manufacturer-recommended alternative for applications requiring enhanced precision. It employs series reference architecture with ±0.05% tolerance and 12ppm/°C temperature coefficient, superior to shunt reference performance. The SOT-23-6 package requires PCB redesign. This selection applies only when precision specifications exceed shunt reference capabilities.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance consistent with the original REF1004C-1.2, ensuring regulatory compliance for EU and global markets.

Q: What is the moisture sensitivity level difference between parts?

A: REF1004C-1.2 has MSL 3 (168 hours). All Analog Devices LT1004 variants have MSL 1 (unlimited), providing superior moisture resistance and extended shelf life. Texas Instruments LT1004CD-1-2 has MSL 1. Lower MSL ratings reduce risk during storage and assembly.

Q: Can I mix packaging formats (Tube vs. Tape & Reel) in production?

A: Electrically, yes. However, assembly process compatibility must be verified. Tube packaging requires manual handling; Tape & Reel requires automated pick-and-place equipment. Mixing formats may require process adjustments or separate assembly runs.