REF1004I-1.2E4 Equivalent & Substitute Parts

Part Overview

The REF1004I-1.2E4 is a Shunt Voltage Reference IC manufactured by Texas Instruments, designed for precision power management applications requiring a fixed 1.235V output. This component operates as a micropower voltage reference with a temperature coefficient of 20 ppm/°C and is packaged in an 8-SOIC surface mount configuration.

The REF1004I-1.2E4 is classified as Obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for systems utilizing this reference voltage IC.

Substiute Parts

REF1004I-1.2E4

Texas InstrumentsIn Stock: 941REF1004I-1.2E4 Datasheet

Current PartRFQ

LT1004ID-1-2

Texas InstrumentsIn Stock: 12614LT1004ID-1-2 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the REF1004I-1.2E4 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Reference Type: Shunt (identical function)
• Output Voltage: 1.235V (fixed output match)
• Current - Output: 20 mA (identical rating)
• Temperature Coefficient: 20 ppm/°C Typical (identical thermal stability)
• Noise Performance: 60 µVrms at 10Hz to 10kHz (identical noise specification)
• Current - Cathode: 10 µA (identical cathode current)
• Operating Temperature Range: -40°C ~ 85°C (identical thermal operating window)

Mechanical Equivalence Criteria:

• Package / Case: 8-SOIC (0.154", 3.90mm Width) (identical footprint)
• Mounting Type: Surface Mount (identical mounting method)

Compliance Equivalence Criteria:

• RoHS Status: ROHS3 Compliant (identical regulatory compliance)
• REACH Status: REACH Unaffected (identical regulatory status)

The substitute part LT1004ID-1-2 meets all electrical, mechanical, and compliance equivalence criteria. The tolerance specification differs marginally (±0.32% versus ±0.3%), which remains within acceptable substitution parameters for this component category. The substitute part carries Active product status and improved moisture sensitivity rating (MSL 1 versus MSL 3), providing enhanced supply availability and reliability characteristics.

Parameter Comparison

Engineering Selection Recommendations

The LT1004ID-1-2 is the direct equivalent substitute for the REF1004I-1.2E4. Selection of this substitute is supported by the following engineering factors:

Product Status Consideration: The REF1004I-1.2E4 is classified as Obsolete, creating supply chain risk. The LT1004ID-1-2 maintains Active product status, ensuring continued availability and manufacturing support from Texas Instruments.

Electrical Compatibility: All critical electrical parameters are identical or equivalent. The tolerance specification of ±0.32% on the substitute part is marginally wider than the original ±0.3%, but remains within the same precision class for shunt voltage reference applications.

Compliance and Certification: Both parts maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment for current and future manufacturing requirements.

Reliability Enhancement: The LT1004ID-1-2 carries an improved Moisture Sensitivity Level rating of MSL 1 (Unlimited) compared to MSL 3 (168 Hours) on the original part. This provides superior reliability characteristics for storage, handling, and long-term deployment.

Mechanical Compatibility: Identical 8-SOIC packaging and surface mount configuration ensure direct PCB footprint compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can the LT1004ID-1-2 be used as a direct replacement for the REF1004I-1.2E4 without circuit modification?

A: Yes. The LT1004ID-1-2 is electrically and mechanically equivalent. All critical parameters including output voltage, current rating, temperature coefficient, noise performance, and operating temperature range are identical. The 8-SOIC package footprint is identical, enabling direct PCB substitution without design changes.

Q: What is the significance of the tolerance difference between ±0.3% and ±0.32%?

A: Both tolerance specifications place these components in the same precision class for voltage reference applications. The ±0.32% tolerance on the LT1004ID-1-2 is marginally wider but functionally equivalent for typical shunt voltage reference circuit designs. Circuit performance impact is negligible in standard applications.

Q: Why is the LT1004ID-1-2 preferred despite the slightly wider tolerance?

A: The LT1004ID-1-2 is preferred because it carries Active product status, ensuring ongoing manufacturing support and supply availability. Additionally, the improved Moisture Sensitivity Level rating (MSL 1 versus MSL 3) provides superior reliability for storage and handling, reducing risk of moisture-induced failures during manufacturing and deployment.

Q: Are there any packaging or mounting differences between these parts?

A: No. Both parts use identical 8-SOIC (0.154", 3.90mm Width) surface mount packaging. PCB layout, reflow soldering parameters, and assembly processes require no modification.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the REF1004I-1.2E4 and LT1004ID-1-2 are ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements for electronic component manufacturing and deployment.

Q: What is the inventory status of the substitute part?

A: The LT1004ID-1-2 has 12,600 pieces in stock as new original inventory, compared to 886 pieces for the obsolete REF1004I-1.2E4. This significant inventory advantage supports production continuity and reduces supply chain risk.