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Diodes Incorporated ZXRE125EFTC
- Part No.:
- ZXRE125EFTC
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZXRE125EFTC.pdf
- Description:
- IC VREF SHUNT 2% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,833
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Product details
Overview
ZXRE125EFTC from Diodes Incorporated is a micropower bandgap voltage reference IC delivering a precise 1.220 V output with ±2% initial tolerance, 20 ppm/°C typical temperature coefficient, and stable operation from 4 µA to 20 mA supply current - used in battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the ZXRE125EFTC datasheet, ZXRE125EFTC pinout, ZXRE125EFTC application, or ZXRE125EFTC equivalent, key selection criteria include low knee current (4 µA), unconditional stability with capacitive loads, SOT23-3 package compatibility, and tolerance-grade trade-offs between accuracy and cost in space-constrained analog signal chains.
Technical Context
The ZXRE125EFTC implements a two-terminal bandgap reference topology operating in reverse breakdown mode, requiring no external biasing components. It functions as a shunt reference with cathode-anode polarity and achieves regulation by maintaining constant voltage across its terminals under varying load current.
Its design targets ultra-low-power analog subsystems where supply current must remain below 10 µA at startup and reference drift must stay within ±2 mV over –40°C to +85°C - enabled by internal curvature compensation and optimized junction layout for thermal stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.220 V ±2% - defines precision DC bias point for ADC references and sensor excitation circuits |
| Tempco (Typ.) | 20 ppm/°C - ensures ≤±1.7 mV drift over full industrial temperature range (–40°C to +85°C) |
| Knee Current | 4 µA - minimum current required to initiate regulation; enables operation in nanoamp-sleep modes |
| Operating Current Range | 4 µA to 20 mA - supports wide dynamic range from ultra-low-power sensing to moderate-load buffering |
| Dynamic Impedance | 0.2 Ω (typ.) at 1 mA - provides low AC impedance for noise-sensitive feedback paths |
| 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 series damping resistors with bypass caps up to 10 µF |
Pinout & Package
SOT23-3 package: 3-pin surface-mount plastic case with gull-wing leads; body dimensions 2.9 mm × 1.3 mm × 1.0 mm (L × W × H); standard JEDEC MO-178AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Reference Cathode Return | Connects to system ground or low-impedance return path; forms current sink node |
| Pin 2 (Cathode) | Reference Output Terminal | Delivers regulated 1.220 V; connects to load or feedback network of regulator/ADC |
| Pin 3 (NC / Anode Tie) | No-connect (optional tie) | Internally floating; may be tied to Pin 1 for mechanical robustness but carries no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Shunt topology with zero external components | Eliminates need for bias resistor networks or op-amp buffers in simple reference designs |
| Green molding compound (Br/Sb-free) | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow compliance |
| Low 4 µA knee current | Enables direct use with high-value pull-up resistors (>1 MΩ) in wake-on-event sensor nodes |
| 0.2 Ω dynamic impedance | Minimizes load-induced voltage shift during fast transient current steps in multiplexed ADC systems |
| Stable with >10 µF ceramic capacitance | Permits integration with large local decoupling without oscillation risk in portable power rails |
Applications
| Battery-Powered Multimeters | Precision RTD Signal Conditioning |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 1.22 V reference for 16-bit delta-sigma ADC conversion across 0–10 V input range. IC Role / Device Role / Timing Role: Shunt voltage reference providing ratiometric excitation and ADC reference simultaneously. Use Value: ±2 mV total error budget over temperature enables 0.05% basic accuracy without calibration. | Use Scenario: 4-wire RTD bridge amplifier in portable temperature logger with 12-month battery life target. IC Role / Device Role / Timing Role: Low-current reference source for constant-current excitation and ADC reference sharing. Use Value: 4 µA knee current allows >5-year battery operation using CR2032 coin cell in sleep mode. |
| Portable ECG Front-End | Industrial Loop-Powered Transmitters |
Use Scenario: Ultra-low-power analog front-end for single-lead ECG monitoring with integrated 12-bit SAR ADC. IC Role / Device Role / Timing Role: Precision bias reference for op-amp instrumentation amplifiers and ADC reference rail. Use Value: 20 ppm/°C tempco limits baseline drift to <1 LSB over patient body temperature range (35–42°C). | Use Scenario: 4–20 mA loop transmitter with HART modulation, powered from 12–42 V loop supply. IC Role / Device Role / Timing Role: Stable shunt reference for DAC output scaling and current sense comparator threshold. Use Value: Unconditional stability with 100 nF ceramic cap ensures reliable HART signal integrity under EMI stress. |
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), higher 80 µA min cathode current, 50 ppm/°C max tempco | Requires external resistor divider; less suitable for fixed 1.22 V systems | Select when adjustable reference or higher output voltage is needed |
| REF1912ASTT | Series topology, 1.22 V fixed, 35 µA quiescent, 15 ppm/°C max tempco, SO-8 package | Higher pin count, requires input capacitor, not pin-compatible | Select when lower tempco and series architecture justify larger footprint and BOM cost |
Compared with TLVH431ACDBVR and REF1912ASTT, the ZXRE125EFTC offers the only SOT23-3 fixed 1.22 V shunt reference with sub-5 µA knee current and guaranteed 2% tolerance - making it uniquely suited for space- and power-constrained legacy-compatible designs.
Availability
ZXRE125EFTC is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical sensors, and industrial data loggers requiring stable component supply with long-term lifecycle visibility.
Supply support for ZXRE125EFTC 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 analog reference product line, engineered specifically for ultra-low-power, space-constrained applications where shunt topology, minimal external components, and guaranteed industrial temperature performance are critical.
FAQ
Is ZXRE125EFTC a three-terminal or two-terminal device?
The ZXRE125EFTC is a two-terminal shunt voltage reference: Pin 1 (anode) and Pin 2 (cathode) form the functional terminals; Pin 3 is internally unconnected and may be left floating or tied to Pin 1 for mechanical reinforcement. No third terminal is electrically active.
Can ZXRE125EFTC replace ZRA125 in existing designs?
Yes - ZXRE125EFTC is explicitly designed as a pin-for-pin compatible replacement for ZRA125 series devices in SOT23-3 packages. Both share identical pinout, cathode-anode polarity, and 1.22 V nominal output, though ZXRE125EFTC offers improved tempco (20 ppm/°C vs. 50 ppm/°C) and lower knee current (4 µA vs. 10 µA).
What is the maximum capacitive load the ZXRE125EFTC can drive without oscillation?
The ZXRE125EFTC is unconditionally stable per datasheet specifications and maintains regulation without oscillation into ≥10 µF ceramic capacitance. This eliminates need for series damping resistors in typical bypass configurations, simplifying layout in portable power domains.
Does ZXRE125EFTC meet RoHS and REACH requirements?
Yes - ZXRE125EFTC uses green molding compound free of bromine and antimony, complying with EU RoHS Directive 2011/65/EU and REACH SVHC regulations. The "E" grade ordering code confirms lead-free termination and halogen-free packaging per Diodes Incorporated's material declarations.
ZXRE125EFTC 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:
- ±2%
- 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
ZXRE125EFTC FAQ
1.How can I place an order for ZXRE125EFTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXRE125EFTC 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 ZXRE125EFTC reliable?
The price and inventory of ZXRE125EFTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE125EFTC is usually 5 days.
3.What payment methods are accepted for ZXRE125EFTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE125EFTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXRE125EFTC?
ZXRE125EFTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXRE125EFTC 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 ZXRE125EFTC?
For technical support, including ZXRE125EFTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE125EFTC requirements.
6.How does Aetrix verify that ZXRE125EFTC is sourced from the original manufacturer or authorized distributors?
All ZXRE125EFTC 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 ZXRE125EFTC meets industry standards.
7.What is the process for return or replacement of ZXRE125EFTC?
All ZXRE125EFTC units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE125EFTC, 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 ZXRE125EFTC part is unused and in its original packaging.
Return procedure for ZXRE125EFTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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