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Diodes Incorporated ZXRE125DFTC
- Part No.:
- ZXRE125DFTC
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZXRE125DFTC.pdf
- Description:
- IC VREF SHUNT 1% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,378
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Product details
Overview
ZXRE125DFTC from Diodes Incorporated is a micropower bandgap voltage reference IC delivering a precise 1.220 V output with ±1% initial tolerance, 20 ppm/°C typical temperature coefficient, and stable operation from 4 µA to 20 mA supply current - used in precision analog signal chains of portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the ZXRE125DFTC datasheet, ZXRE125DFTC pinout, ZXRE125DFTC application, or ZXRE125DFTC equivalent, key selection criteria include low knee current (4 µA), unconditionally stable performance with capacitive loads, SOT23-3 package compatibility, and direct replacement capability for ZRA124/ZRA125 series references.
Technical Context
The ZXRE125DFTC implements a two-terminal bandgap reference topology operating in reverse breakdown mode, requiring no external biasing components. It achieves regulation by maintaining a stable 1.220 V across its anode–cathode terminals under reverse bias, with minimal dependence on supply current variation between 4 µA and 20 mA.
Its internal design incorporates curvature compensation to limit temperature-induced drift, yielding a typical TC of 20 ppm/°C over –40°C to +85°C. The device exhibits <0.6 Ω dynamic impedance at 1 mA and remains stable with >1 µF capacitive loads without oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.220 V ±1% at 25°C - defines system ADC reference or sensor excitation level accuracy |
| Temp Coefficient | 20 ppm/°C typical - contributes ≤0.17 mV drift over –40°C to +85°C |
| Knee Current | 4 µA - minimum current enabling regulation; enables ultra-low-power sleep-mode reference |
| Operating Current Range | 4 µA to 20 mA - supports both energy-harvesting sensors and higher-accuracy active circuits |
| Dynamic Impedance | 0.6 Ω max at 1 mA - ensures minimal load-induced voltage shift during fast transient events |
| Wideband Noise | 60 µV(rms) (10 Hz–10 kHz) - suitable for 12-bit to 14-bit precision measurement front-ends |
| Capacitive Load Stability | Unconditionally stable - eliminates need for isolation resistors with bypass or filtering caps |
Pinout & Package
SOT23-3 package: 3-pin surface-mount plastic case with gull-wing leads, 1.9 mm pitch, 2.8 mm × 2.6 mm footprint, 1.12 mm height - optimized for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Reference output terminal (cathode-connected internally) | Connected to system ground or low-impedance return path; reverse-biased configuration |
| Pin 2 (Cathode) | Input terminal (reverse-bias supply node) | Accepts positive supply voltage; sets reverse current through reference junction |
| Pin 3 (NC / Anode) | No-connect or optional anode tie | Internally tied to Pin 1; may be left floating or shorted to Pin 1 per layout requirements |
Key Features
| Feature | Design Value |
|---|---|
| Low knee current | 4 µA enables reference activation in sub-10 µA power domains (e.g., RTC backup, wake-on-event circuits) |
| High tolerance grade | ±1% initial accuracy (D-grade) reduces calibration overhead in production test flows |
| Thermal stability | 20 ppm/°C TC ensures <±1 LSB error in 12-bit systems across industrial temperature range |
| Capacitive load immunity | Stable with ≥1 µF ceramic output capacitance - simplifies EMI filtering without phase-compensation networks |
| Pb-free & RoHS-compliant | Green molding compound (no Br/Sb) meets IPC/JEDEC J-STD-020 moisture sensitivity Level 1 |
Applications
| Battery-Powered Data Loggers | Precision Portable Multimeters |
|---|---|
Use Scenario: Continuous low-power voltage monitoring of Li-ion cells and environmental sensors over multi-week deployments. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing stable 1.220 V for 16-bit sigma-delta ADC reference input. Use Value: 4 µA knee current extends battery life beyond 1 year on CR2032; ±1% tolerance avoids per-unit gain trimming. | Use Scenario: Handheld multimeter requiring accurate DCV and resistance ranges with auto-ranging and autoranging reference scaling. IC Role / Device Role / Timing Role: Primary voltage reference for dual-slope integrator and reference divider network. Use Value: 20 ppm/°C TC maintains <0.01% reading accuracy across handheld thermal gradients; SOT23-3 eases manual rework. |
| Wireless Sensor Node ADC Front-End | Industrial Loop-Powered Transmitters |
Use Scenario: Sub-100 µA wireless node measuring thermocouple or strain gauge signals via low-noise PGA and SAR ADC. IC Role / Device Role / Timing Role: Low-noise (60 µVrms), low-drift reference for PGA gain-setting and ADC VREF. Use Value: Wide 4 µA–20 mA operating range allows shared reference between analog front-end and RF transceiver sleep/wake cycles. | Use Scenario: 4–20 mA loop transmitter with HART modulation, where reference stability directly impacts current-loop accuracy. IC Role / Device Role / Timing Role: Shunt reference establishing precision 2.5 V or 5 V derived rails for DAC and op-amp biasing. Use Value: Unconditional stability with 10 µF bulk capacitance prevents loop oscillation during HART burst transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | Adjustable output (2.5 V min), 2% initial tolerance, 50 ppm/°C TC, 80 µA min cathode current | Requires two external resistors; unsuitable for fixed 1.22 V use without added error | Select only if adjustable reference or higher output voltage is required |
| MAX6012AEUR+T | Fixed 1.25 V output, ±0.2% tolerance, 30 ppm/°C TC, SOT23-3, 7 µA min operating current | Higher accuracy but incompatible output voltage; not drop-in for 1.22 V designs | Choose when 1.25 V system architecture exists and tighter tolerance justifies cost premium |
Compared with TLVH431ACDBVR and MAX6012AEUR+T, the ZXRE125DFTC uniquely delivers true 1.220 V ±1% with sub-5 µA startup, making it irreplaceable in legacy or space-constrained 1.22 V reference designs where pin-for-pin compatibility and ultra-low power are mandatory.
Availability
ZXRE125DFTC is available at Aetrix Electronics and suitable for battery-powered data loggers, portable multimeters, and industrial loop-powered transmitters requiring stable component supply with guaranteed long-term sourcing.
Supply support for ZXRE125DFTC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and Malaysia.
The ZXRE125 belongs to Diodes' precision voltage reference product line, engineered specifically for space-constrained, low-power analog systems where accuracy, stability, and SOT23-3 compatibility are critical.
FAQ
What is the correct biasing configuration for ZXRE125DFTC?
The ZXRE125DFTC operates as a two-terminal shunt reference: connect Pin 2 (cathode) to the positive supply rail through a current-setting resistor, and Pin 1 (anode) to system ground. Pin 3 is internally tied to Pin 1 and may be left unconnected or shorted to Pin 1. No external feedback or op-amp is required.
Can ZXRE125DFTC replace ZRA125 in existing designs?
Yes - ZXRE125DFTC is explicitly designed as a pin-for-pin, functionally compatible replacement for ZRA125 series references. Identical SOT23-3 pinout, matching 1.22 V nominal output, and comparable 1% tolerance ensure seamless drop-in substitution without layout or schematic changes.
Does ZXRE125DFTC require an output capacitor for stability?
No - the device is unconditionally stable and does not require an output capacitor for stability. However, a 100 nF ceramic capacitor is recommended at the cathode for high-frequency noise suppression; larger values (up to 10 µF) are supported without risk of oscillation.
What is the maximum allowable reverse voltage across ZXRE125DFTC?
The absolute maximum reverse voltage is limited by the 30 mA absolute maximum reverse current rating. With typical dynamic impedance of 0.6 Ω, applying >18 V across the device would exceed 30 mA at room temperature. For reliable operation, keep reverse voltage below 15 V to maintain current within 20 mA specified operating range.
ZXRE125DFTC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 60µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 8 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ZXRE125DFTC FAQ
1.How can I place an order for ZXRE125DFTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXRE125DFTC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ZXRE125DFTC reliable?
The price and inventory of ZXRE125DFTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE125DFTC is usually 5 days.
3.What payment methods are accepted for ZXRE125DFTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE125DFTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXRE125DFTC?
ZXRE125DFTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXRE125DFTC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ZXRE125DFTC?
For technical support, including ZXRE125DFTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE125DFTC requirements.
6.How does Aetrix verify that ZXRE125DFTC is sourced from the original manufacturer or authorized distributors?
All ZXRE125DFTC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ZXRE125DFTC meets industry standards.
7.What is the process for return or replacement of ZXRE125DFTC?
All ZXRE125DFTC units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE125DFTC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ZXRE125DFTC part is unused and in its original packaging.
Return procedure for ZXRE125DFTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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