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ZXRE4041FFTC Equivalent & Substitute Parts
Part Overview
The ZXRE4041FFTC is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 1.225V output with ±3% tolerance in a SOT-23-3 surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design requirements and production continuity. Substitute parts must maintain electrical compatibility across output voltage, current capacity, and thermal operating range while meeting modern component availability and compliance standards.
Substiute Parts
Key Parameters
| Parameter | ZXRE4041FFTC |
|---|---|
| Reference Type | Shunt |
| Output Type | Fixed |
| Voltage - Output (Min/Fixed) | 1.225V |
| Current - Output | 12 mA |
| Tolerance | ±3% |
| Temperature Coefficient | 100ppm/°C |
| Noise - 10Hz to 10kHz | 60µVrms |
| Current - Cathode | 30 µA |
| Operating Temperature | -40°C ~ 125°C |
| Package / Case | TO-236-3, SC-59, SOT-23-3 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility is determined by the following critical parameters:
- Output Voltage: Must be 1.225V fixed
- Package Type: Must be SOT-23-3 (TO-236-3, SC-59)
- Reference Type: Must be Shunt
- Output Type: Must be Fixed
- RoHS & Compliance: Must maintain ROHS3 compliance and REACH unaffected status
Substitute parts are grouped into two categories based on tolerance specifications:
Category A - Enhanced Tolerance (±0.1%): LM4041A12IDBZR, LM4041A12IDBZT, LM4041AEM3-1.2+T, LM4041AIM3-1.2+T, LM4041AIM3-1.2/NOPB, LM4041AIM3X-1.2/NOPB. These parts provide superior voltage accuracy compared to the original ±3% specification.
Category B - Moderate Tolerance (±0.2%): LM4041B12IDBZR, LM4041B12IDBZT, LM4041BEM3-1.2+T, LM4041BIM3-1.2+T. These parts offer improved tolerance while maintaining compatibility with the original design intent.
All substitute parts maintain the 1.225V output voltage, SOT-23-3 package configuration, and shunt reference topology required for direct functional replacement.
Parameter Comparison
| Part Number | Manufacturer | Output Voltage | Current - Output | Tolerance | Noise (10Hz-10kHz) | Current - Cathode | Operating Temperature | Product Status | Packaging |
|---|---|---|---|---|---|---|---|---|---|
| ZXRE4041FFTC | Diodes Incorporated | 1.225V | 12 mA | ±3% | 60µVrms | 30 µA | -40°C ~ 125°C | Obsolete | Tape & Reel (TR) |
| LM4041A12IDBZR | Texas Instruments | 1.225V | 12 mA | ±0.1% | 20µVrms | 80 µA | -40°C ~ 85°C | Active | Cut Tape (CT) & Digi-Reel® |
| LM4041A12IDBZT | Texas Instruments | 1.225V | 12 mA | ±0.1% | 20µVrms | 80 µA | -40°C ~ 85°C | Active | Tape & Reel (TR) |
| LM4041AEM3-1.2+T | Analog Devices Inc./Maxim Integrated | 1.225V | 12 mA | ±0.1% | 20µVrms | 60 µA | -40°C ~ 125°C | Active | Tape & Reel (TR) |
| LM4041AIM3-1.2+T | Analog Devices Inc./Maxim Integrated | 1.225V | 20 mA | ±0.1% | 20µVrms | 60 µA | -40°C ~ 85°C | Active | Tape & Reel (TR) |
| LM4041AIM3-1.2/NOPB | Texas Instruments | 1.225V | 12 mA | ±0.1% | 20µVrms | 65 µA | -40°C ~ 85°C | Active | Cut Tape (CT) & Digi-Reel® |
| LM4041AIM3X-1.2/NOPB | Texas Instruments | 1.225V | 12 mA | ±0.1% | 20µVrms | 65 µA | -40°C ~ 85°C | Active | - |
| LM4041B12IDBZR | Texas Instruments | 1.225V | 12 mA | ±0.2% | 20µVrms | 80 µA | -40°C ~ 85°C | Active | Cut Tape (CT) & Digi-Reel® |
| LM4041B12IDBZT | Texas Instruments | 1.225V | 12 mA | ±0.2% | 20µVrms | 80 µA | -40°C ~ 85°C | Active | Tape & Reel (TR) |
| LM4041BEM3-1.2+T | Analog Devices Inc./Maxim Integrated | 1.225V | 12 mA | ±0.2% | 20µVrms | 60 µA | -40°C ~ 125°C | Active | Tape & Reel (TR) |
| LM4041BIM3-1.2+T | Analog Devices Inc./Maxim Integrated | 1.225V | 20 mA | ±0.2% | 20µVrms | 60 µA | -40°C ~ 85°C | Active | Tape & Reel (TR) |
Engineering Selection Recommendations
All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements. The primary selection criterion is product status: all substitutes are active components with established supply chains, eliminating obsolescence risk associated with the ZXRE4041FFTC.
For applications requiring extended temperature operation to 125°C, LM4041AEM3-1.2+T and LM4041BEM3-1.2+T are the appropriate selections, matching the original part's thermal range.
For standard industrial applications operating within -40°C to 85°C, Texas Instruments LM4041A and LM4041B series parts offer multiple packaging options (Cut Tape and Tape & Reel) to accommodate procurement flexibility.
Parts with 20 mA output current (LM4041AIM3-1.2+T and LM4041BIM3-1.2+T) provide increased current capacity beyond the original 12 mA specification and are suitable for applications requiring higher load current.
Tolerance selection depends on circuit requirements: ±0.1% tolerance (Category A) provides superior voltage accuracy for precision applications, while ±0.2% tolerance (Category B) maintains acceptable accuracy for general-purpose voltage reference applications.
Frequently Asked Questions (FAQ)
Q: Can LM4041A and LM4041B series parts directly replace the ZXRE4041FFTC?
A: Yes. All listed substitutes maintain the 1.225V fixed output voltage, SOT-23-3 package configuration, and shunt reference topology. Pin-to-pin compatibility is preserved across all substitute parts.
Q: What is the difference between ±0.1% and ±0.2% tolerance specifications?
A: Tolerance defines the maximum deviation of output voltage from the nominal 1.225V specification. ±0.1% tolerance (Category A) limits deviation to ±1.225mV, while ±0.2% tolerance (Category B) limits deviation to ±2.45mV. The original ZXRE4041FFTC specified ±3% tolerance (±36.75mV). Both substitute categories provide improved accuracy.
Q: Why do some parts specify 20 mA output current instead of 12 mA?
A: Output current rating indicates the maximum current the reference can supply to external circuitry. Parts rated for 20 mA can deliver higher load current while maintaining voltage regulation. This is a superset capability; 20 mA rated parts are compatible with designs requiring 12 mA or less.
Q: What is the significance of cathode current specifications?
A: Cathode current represents the minimum bias current required to maintain proper reference operation. Variations in cathode current (30 µA to 80 µA across the product range) reflect different internal circuit designs but do not affect functional compatibility in standard applications.
Q: Are Cut Tape and Tape & Reel packaging options interchangeable?
A: Both packaging formats contain identical die and electrical specifications. The difference is in delivery format: Cut Tape (CT) & Digi-Reel® is suitable for lower-volume or manual assembly, while Tape & Reel (TR) is optimized for high-volume automated pick-and-place assembly. Selection depends on manufacturing process requirements.
Q: Which substitute part is recommended for new designs?
A: LM4041A12IDBZT (Texas Instruments, Tape & Reel) or LM4041AEM3-1.2+T (Analog Devices Inc./Maxim Integrated, extended temperature range) are recommended for new designs. Both are active products with established supply availability and superior tolerance specifications compared to the obsolete ZXRE4041FFTC.
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