REF1004C-2.5 Equivalent & Substitute Parts

Part Overview

The REF1004C-2.5 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 2.5V output with ±0.4% tolerance. This component is classified as a Power Management (PMIC) device and is packaged in 8-SOIC surface mount configuration. 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 2.5V shunt voltage reference functionality.

Substiute Parts

REF1004C-2.5

Texas InstrumentsIn Stock: 1734REF1004C-2.5 Datasheet

Current PartRFQ

REF35250QDBVR

Texas InstrumentsIn Stock: 744REF35250QDBVR Datasheet

MFR RecommendedRFQ

LT1004IS8-2.5#PBF

Analog Devices Inc.In Stock: 1495LT1004IS8-2.5#PBF Datasheet

UpgradeRFQ

LT1004IS8-2.5#TRPBF

Analog Devices Inc.In Stock: 15854LT1004IS8-2.5#TRPBF Datasheet

UpgradeRFQ

LT1004CS8-2.5#PBF

Analog Devices Inc.In Stock: 3824LT1004CS8-2.5#PBF Datasheet

MFR RecommendedRFQ

LT1004CS8-2.5#TRPBF

Analog Devices Inc.In Stock: 2145LT1004CS8-2.5#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the REF1004C-2.5 is determined by the following critical parameters:

• Reference Type: Shunt voltage reference architecture
• Output Voltage: Fixed 2.5V
• Output Current: 20 mA capability
• Package: 8-SOIC surface mount form factor
• Tolerance & Stability: Voltage accuracy and temperature coefficient performance
• Operating Temperature Range: Functional range compatibility
• Compliance: RoHS3 and REACH compliance status

Substitute parts are grouped into two categories:

Category 1 - Direct Shunt Reference Substitutes (Identical Architecture) Parts maintaining shunt reference topology with matching 2.5V output, 20 mA current, and 8-SOIC packaging. These include LT1004IS8-2.5#PBF, LT1004IS8-2.5#TRPBF, LT1004CS8-2.5#PBF, and LT1004CS8-2.5#TRPBF from Analog Devices Inc.

Category 2 - Alternative Architecture (Series Reference) The REF35250QDBVR represents an alternative topology using series voltage reference architecture with improved performance specifications but different package (SOT-23-6) and electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Shunt Architecture Maintained)

The LT1004 series from Analog Devices Inc. provides pin-compatible and functionally equivalent substitutes in 8-SOIC packaging. All variants (LT1004IS8-2.5#PBF, LT1004IS8-2.5#TRPBF, LT1004CS8-2.5#PBF, LT1004CS8-2.5#TRPBF) maintain shunt reference topology with identical 2.5V output and 20 mA current specifications. These parts are in Active product status with unlimited MSL ratings, providing superior supply chain continuity compared to the Last Time Buy REF1004C-2.5.

Selection between LT1004 variants depends on packaging format requirements:

• Tube packaging: LT1004IS8-2.5#PBF or LT1004CS8-2.5#PBF
• Tape & Reel format: LT1004IS8-2.5#TRPBF or LT1004CS8-2.5#TRPBF

Temperature range consideration: LT1004IS8 variants support -40°C to 85°C, while LT1004CS8 variants match the original 0°C to 70°C range.

For Enhanced Performance (Alternative Architecture)

The REF35250QDBVR offers superior electrical performance with ±0.05% tolerance and 12 ppm/°C temperature coefficient, along with extended -40°C to 125°C operating range. However, this part uses series reference architecture and SOT-23-6 packaging, requiring circuit redesign and PCB layout modifications. This option is suitable for applications where improved accuracy and wider temperature operation justify design changes.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can LT1004 series parts directly replace REF1004C-2.5 without circuit modification?

A: Yes, the LT1004IS8-2.5 and LT1004CS8-2.5 variants are pin-compatible shunt voltage reference ICs with identical 8-SOIC packaging, 2.5V output, and 20 mA current specifications. Direct PCB substitution is possible without circuit redesign.

Q: What is the difference between LT1004IS8 and LT1004CS8 variants?

A: Both maintain identical electrical specifications and 8-SOIC packaging. The primary difference is operating temperature range: LT1004IS8 supports -40°C to 85°C, while LT1004CS8 supports 0°C to 70°C, matching the original REF1004C-2.5 range.

Q: Why does REF35250QDBVR have different packaging?

A: The REF35250QDBVR uses series voltage reference architecture rather than shunt topology, resulting in SOT-23-6 packaging instead of 8-SOIC. This alternative architecture provides improved tolerance (±0.05%) and lower temperature coefficient (12 ppm/°C) but requires circuit redesign for implementation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts (LT1004 series and REF35250QDBVR) are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance with the original REF1004C-2.5.

Q: What packaging formats are available for LT1004 substitutes?

A: LT1004 2.5V shunt references are available in Tube, Tape & Reel (TR), and Cut Tape & Digi-Reel formats. Selection depends on production volume and assembly process requirements.

Q: How does tolerance affect substitution suitability?

A: The REF1004C-2.5 specifies ±0.4% tolerance, while LT1004 variants specify ±0.8%. For applications requiring tighter tolerance, the REF35250QDBVR offers ±0.05% accuracy, though this requires alternative circuit implementation.

Q: What is the MSL rating significance for these parts?

A: MSL (Moisture Sensitivity Level) indicates moisture exposure limits during storage and handling. LT1004 variants have MSL 1 (unlimited storage), superior to REF1004C-2.5 MSL 3 (168 hours), reducing moisture-related reliability risks in manufacturing environments.