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Diodes Incorporated ZXRE125EFTA
- Part No.:
- ZXRE125EFTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZXRE125EFTA.pdf
- Description:
- IC VREF SHUNT 2% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:33,678
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Product details
Overview
ZXRE125EFTA 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 for accurate ADC biasing and sensor excitation.
For engineers reviewing the ZXRE125EFTA datasheet, ZXRE125EFTA pinout, ZXRE125EFTA application, or ZXRE125EFTA equivalent, key selection factors include low knee current (4 µA), unconditional stability with capacitive loads, SOT23-3 package constraints, and compatibility with ZRA124/ZRA125-series replacements in space-constrained analog signal chains.
Technical Context
The ZXRE125EFTA implements a two-terminal shunt topology with internal bandgap core, operating as a precision voltage sink referenced to ground. It requires no external components for basic operation and maintains regulation across 8 µA–20 mA load current while exhibiting only 1 mV ΔVR over that range.
Its thermal design achieves 20 ppm/°C typical TC by trimming curvature-compensated bandgap voltage at wafer level; dynamic impedance remains below 0.6 Ω at 1 mA, enabling low-noise performance (60 µVrms, 10 Hz–10 kHz) in high-resolution data acquisition front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.220 V ±2% - fixed reference voltage with guaranteed accuracy over full temperature and current range |
| Temp Coefficient | 20 ppm/°C typical - ensures ≤2.5 mV drift over –40°C to +85°C ambient |
| Knee Current | 4 µA - minimum current required to initiate regulation; enables ultra-low-power sleep-mode biasing |
| Dynamic Impedance | 0.6 Ω max at 1 mA - minimizes load-induced voltage error in precision current-sink configurations |
| Noise (10Hz–10kHz) | 60 µVrms - supports 16-bit+ ADC accuracy without additional filtering |
| Capacitive Load Stability | Unconditionally stable - operates reliably with ≥1 µF ceramic output capacitance, simplifying layout |
| Operating Current Range | 4 µA to 20 mA - accommodates both standby sensing and active signal conditioning modes |
Pinout & Package
SOT23-3 surface-mount package (JEDEC TO-236AB), 2.80 × 2.64 × 1.12 mm body, gull-wing leads, RoHS-compliant green molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Reference Output / Cathode Connection Point | Connected to system ground when used in standard shunt configuration; may float or tie to Pin 2 per layout requirements |
| Pin 2 (Cathode) | Input / Supply Terminal | Receives unregulated input voltage; reverse-biased operation establishes regulated 1.22 V drop across device |
| Pin 3 (NC) | No Connect | Internally unconnected; must remain floating or grounded per PCB design rules - not usable as auxiliary terminal |
Key Features
| Feature | Design Value |
|---|---|
| Shunt topology with no external components | Enables single-resistor biasing in portable systems; eliminates trim potentiometers and feedback networks |
| 0.6 Ω dynamic impedance | Reduces output voltage variation under dynamic load steps - critical for multiplexed sensor arrays |
| 4 µA knee current | Allows operation from coin-cell batteries for >5 years in periodic wake-up monitoring applications |
| Unconditional capacitive-load stability | Permits direct connection to ADC reference inputs with decoupling caps, avoiding instability-induced measurement errors |
| ±2% initial tolerance (E-grade) | Meets mid-tier precision requirements without post-assembly calibration in industrial handheld meters |
Applications
| Battery-Powered Multimeters | Precision RTD Signal Conditioning |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable reference for 4½-digit DC voltage measurement across varying battery voltage (2.0–3.6 V). IC Role / Device Role / Timing Role: Shunt voltage reference providing 1.220 V基准 for SAR ADC and auto-zero amplifier stages. Use Value: ±2% tolerance and 20 ppm/°C TC ensure <0.01% full-scale error over –10°C to +50°C operating range without calibration. | Use Scenario: Portable temperature logger using 3-wire Pt100 RTD with constant-current excitation and ratiometric ADC conversion. IC Role / Device Role / Timing Role: Precision reference for current-source DAC and ADC reference rail in low-power microcontroller subsystem. Use Value: 4 µA knee current enables reference activation only during measurement cycles, extending CR2032 battery life beyond 3 years. |
| Portable Gas Detectors | Medical Pulse Oximeter Front-End |
Use Scenario: Wearable electrochemical gas sensor module powered by lithium-polymer cell with intermittent sampling. IC Role / Device Role / Timing Role: Stable bias reference for transimpedance amplifier converting sensor current to voltage. Use Value: Unconditional stability with 1 µF ceramic cap suppresses switching noise from integrated DC-DC converter, preserving sub-ppm signal integrity. | Use Scenario: Low-power pulse oximeter ASIC requiring matched reference for red/IR LED current control and photodiode ADC. IC Role / Device Role / Timing Role: Dual-role reference: sets LED drive current via resistor and provides ADC reference for analog front-end. Use Value: 60 µVrms broadband noise prevents SNR degradation in weak photodiode signals (<100 nA), maintaining SpO₂ accuracy ±1%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXRE125DFTA | ±1% initial tolerance, otherwise identical electrical specs and pinout | Higher accuracy needed for calibrated test equipment where factory trim offsets cost sensitivity | Select when tighter initial accuracy justifies ~15% higher unit cost and inventory segmentation |
| TLVH431ACDBVR | Adjustable (2.5 V min) 3-terminal shunt ref; 2% tolerance option; 0.5 Ω impedance; 75 ppm/°C TC | Requires external resistors for 1.22 V setting; less stable over temperature than ZXRE125EFTA | Choose only if adjustable output or higher current capability (up to 100 mA) is required - not a drop-in replacement |
Compared with ZXRE125DFTA, the E-grade trades 1% accuracy for lower cost and broader tolerance margin; versus TLVH431ACDBVR, it offers superior TC and true 1.22 V fixed output without resistor network errors or layout sensitivity.
Availability
ZXRE125EFTA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical sensors, and industrial handheld testers requiring stable component supply with long-term traceability and consistent parametric performance.
Supply support for ZXRE125EFTA 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, specializing in high-reliability power management, signal integrity, and precision analog solutions.
The ZXRE125 series belongs to Diodes' precision voltage reference product line, engineered specifically for ultra-low-power, space-constrained applications demanding stable reference performance without external compensation.
FAQ
What is the minimum operating current for reliable regulation?
The ZXRE125EFTA achieves stable regulation starting at 4 µA (knee current), verified across –40°C to +85°C. Below this, output voltage drops nonlinearly; design must ensure bias resistor delivers ≥4 µA even at lowest input voltage and highest temperature.
Can ZXRE125EFTA replace ZRA125 in existing designs?
Yes - ZXRE125EFTA is pin-for-pin and functionally compatible with ZRA125 series devices in SOT23-3 packages. Both share identical pinout, 1.22 V nominal output, and shunt topology; no layout or schematic changes are required for migration.
Is external capacitor required for stability?
No external capacitor is required. The device is unconditionally stable with capacitive loads up to at least 10 µF, as confirmed in Diodes' DS32170 Rev. 8 characterization. A 100 nF ceramic cap is recommended for high-frequency noise suppression but not for loop stability.
What does "E-grade" signify in ZXRE125EFTA?
"E" denotes the ±2% initial output voltage tolerance grade per Diodes' ordering matrix. It corresponds to device marking "12G" on the SOT23 package and is tested at 25°C with IR = 100 µA, distinct from C (±0.5%), D (±1%), and F (±3%) grades.
ZXRE125EFTA 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:
- Active
- 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
ZXRE125EFTA FAQ
1.How can I place an order for ZXRE125EFTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXRE125EFTA 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 ZXRE125EFTA reliable?
The price and inventory of ZXRE125EFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE125EFTA is usually 5 days.
3.What payment methods are accepted for ZXRE125EFTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE125EFTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXRE125EFTA?
ZXRE125EFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXRE125EFTA 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 ZXRE125EFTA?
For technical support, including ZXRE125EFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE125EFTA requirements.
6.How does Aetrix verify that ZXRE125EFTA is sourced from the original manufacturer or authorized distributors?
All ZXRE125EFTA 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 ZXRE125EFTA meets industry standards.
7.What is the process for return or replacement of ZXRE125EFTA?
All ZXRE125EFTA units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE125EFTA, 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 ZXRE125EFTA part is unused and in its original packaging.
Return procedure for ZXRE125EFTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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