ZXRE1004FN8TA Equivalent & Substitute Parts

Part Overview

The ZXRE1004FN8TA is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 1.22V output with ±3% tolerance. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. Shunt voltage reference ICs are critical in precision analog circuits for establishing stable reference voltages in power management applications.

Substiute Parts

ZXRE1004FN8TA

Diodes IncorporatedIn Stock: 670ZXRE1004FN8TA Datasheet

Current PartRFQ

LM285BYMX-1.2/NOPB

Texas InstrumentsIn Stock: 5245LM285BYMX-1.2/NOPB Datasheet

MFR RecommendedRFQ

LM285DG4-1-2

Texas InstrumentsIn Stock: 16606LM285DG4-1-2 Datasheet

MFR RecommendedRFQ

LM285DRE4-1-2

Texas InstrumentsIn Stock: 21959LM285DRE4-1-2 Datasheet

MFR RecommendedRFQ

LM385BDG4-1-2

Texas InstrumentsIn Stock: 3170LM385BDG4-1-2 Datasheet

MFR RecommendedRFQ

LM385BDR-1-2

Texas InstrumentsIn Stock: 33009LM385BDR-1-2 Datasheet

MFR RecommendedRFQ

LM385BDRG4-1-2

Texas InstrumentsIn Stock: 3603LM385BDRG4-1-2 Datasheet

MFR RecommendedRFQ

LM385BXMX-1.2/NOPB

National SemiconductorIn Stock: 5949LM385BXMX-1.2/NOPB Datasheet

MFR RecommendedRFQ

LM385BYM-1.2/NOPB

Texas InstrumentsIn Stock: 9378LM385BYM-1.2/NOPB Datasheet

MFR RecommendedRFQ

LM385D-1-2

Texas InstrumentsIn Stock: 1539LM385D-1-2 Datasheet

MFR RecommendedRFQ

LM385DG4-1-2

Texas InstrumentsIn Stock: 9563LM385DG4-1-2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZXRE1004FN8TA is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Reference Type: Shunt (fixed output topology)
• Output Voltage: 1.22V nominal (acceptable range: 1.235V ±1% to 1.235V ±2%)
• Current - Output: 20 mA (matching current capability)
• Package / Case: 8-SOIC form factor (identical pinout and footprint)
• Operating Temperature Range: Must support -40°C ~ 85°C minimum

Substitution Logic: The ZXRE1004FN8TA operates at 1.22V with ±3% tolerance. Substitute parts from the Texas Instruments LM285 and LM385 series provide 1.235V output (within acceptable tolerance band) with improved specifications including ±1% to ±2% tolerance, superior temperature coefficients (20ppm/°C to 50ppm/°C), and identical 8-SOIC packaging. All substitute candidates maintain 20 mA output current and 60µVrms noise performance across the 10Hz to 10kHz band.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - Full Temperature Range Applications: LM285BYMX-1.2/NOPB is the preferred substitute for designs requiring the extended -40°C ~ 85°C operating temperature range. This part maintains active product status, offers ROHS3 compliance, and delivers superior tolerance (±1%) and temperature coefficient (50ppm/°C) compared to the obsolete ZXRE1004FN8TA. The 1.235V output falls within acceptable tolerance margins for 1.22V reference applications.

Secondary Recommendation - Standard Temperature Range Applications: LM385BYM-1.2/NOPB serves as an alternative for designs operating within 0°C ~ 70°C. This part is actively manufactured, ROHS3 compliant, and provides equivalent electrical performance with ±1% tolerance and 50ppm/°C temperature coefficient.

Compliance Consideration: The original ZXRE1004FN8TA is RoHS non-compliant. All recommended substitutes from Texas Instruments are ROHS3 compliant, supporting modern procurement and environmental regulatory requirements.

Inventory Availability: LM285BYMX-1.2/NOPB (5200 pcs), LM385BYM-1.2/NOPB (9302 pcs), and LM385BXMX-1.2/NOPB (5917 pcs) offer the highest stock levels for immediate procurement.

Frequently Asked Questions (FAQ)

Q: Can LM385 series parts directly replace the ZXRE1004FN8TA? A: Yes, LM385 series shunt voltage references in 8-SOIC packaging are electrically and mechanically compatible. The 1.235V output is within acceptable tolerance for 1.22V reference applications. Verify your circuit design tolerates the ±1% to ±2% tolerance specification.

Q: What is the voltage difference between ZXRE1004FN8TA (1.22V) and LM285/LM385 substitutes (1.235V)? A: The 15mV difference represents approximately 1.2% of the nominal 1.22V value. This falls within the ±3% tolerance band of the original part and the ±1% to ±2% tolerance of substitutes. Circuit designs must accommodate this voltage offset in precision applications.

Q: Are there temperature range limitations with substitute parts? A: LM285 series parts maintain -40°C ~ 85°C operation, matching the original ZXRE1004FN8TA. LM385 series parts operate within 0°C ~ 70°C. Select LM285 variants for extended low-temperature applications below 0°C.

Q: Which substitute offers the best temperature stability? A: LM285DG4-1-2, LM285DRE4-1-2, LM385BDG4-1-2, LM385BDR-1-2, LM385BDRG4-1-2, LM385D-1-2, and LM385DG4-1-2 all provide 20ppm/°C temperature coefficient, superior to the original 75ppm/°C specification.

Q: What packaging formats are available for substitutes? A: All substitute parts are available in 8-SOIC (0.154", 3.90mm Width) surface mount packaging, maintaining identical PCB footprint compatibility with the original ZXRE1004FN8TA.

Q: Are there active product alternatives, or only obsolete stock? A: LM285BYMX-1.2/NOPB, LM385BXMX-1.2/NOPB, and LM385BYM-1.2/NOPB are actively manufactured. These are recommended for new designs requiring long-term supply assurance.