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Diodes Incorporated ZXRE125DRSTZ
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- Part No.:
- ZXRE125DRSTZ
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- E-Line-3
- Datasheet:
-
ZXRE125DRSTZ.pdf
- Description:
- IC VREF SHUNT 1% E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:3,135
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Product details
Overview
ZXRE125DRSTZ 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 ZXRE125DRSTZ datasheet, ZXRE125DRSTZ pinout, ZXRE125DRSTZ application, or ZXRE125DRSTZ equivalent, key selection criteria include low knee current (4 µA), unconditional stability with capacitive loads, SOT23-3 package compatibility, and tolerance-grade traceability across ZRA124/ZRA125-replacement designs.
Technical Context
The ZXRE125DRSTZ implements a two-terminal shunt topology with internal bandgap core, operating as a precision 1.220 V reverse-breakdown reference. It functions across 4 µA–20 mA cathode current, maintaining regulation without external biasing components.
Its design achieves unconditional stability up to 10 µF capacitive load and exhibits low dynamic impedance (0.2 Ω typ. at 1 mA), enabling direct use in ADC reference buffers and low-noise LDO feedback networks without series resistance compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.220 V ±1% (D-grade) - defines absolute accuracy for 12-bit+ ADC reference and sensor excitation circuits |
| Tempco | 20 ppm/°C typical - ensures ≤±2.5 mV drift over –40°C to +85°C ambient for field-deployed instruments |
| Knee Current | 4 µA - enables operation in ultra-low-power wake-up circuits and energy-harvesting nodes |
| Dynamic Impedance | 0.2 Ω typical at 1 mA - minimizes load-induced voltage shift in high-precision feedback loops |
| Noise (10Hz–10kHz) | 60 µVrms - supports sub-LSB stability in 16-bit SAR ADC references |
| Capacitive Load Stability | Unconditional up to 10 µF - eliminates need for isolation resistors in noisy power rail applications |
Pinout & Package
SOT23-3 package: 1.40 mm × 2.64 mm footprint, 1.12 mm height, gull-wing leads; RoHS-compliant green molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Connected to system GND; serves as return path for cathode current and sets reference potential |
| Cathode (Pin 2) | Output voltage node | Delivers regulated 1.220 V when biased with external current source; connects to ADC REF+, op-amp non-inverting input, or sensor bridge |
| No-Connect (Pin 3) | Unused terminal | Internally unconnected; must remain floating or tied to Pin 1 per datasheet guidance to avoid parasitic leakage paths |
Key Features
| Feature | Design Value |
|---|---|
| Shunt topology with no external bias required | Operates directly from current source - eliminates startup delay and quiescent current overhead of series references |
| Low 4 µA knee current | Enables use with high-value pull-up resistors (>1 MΩ) in coin-cell-powered devices lasting >5 years |
| 0.2 Ω dynamic impedance | Reduces output voltage error to <10 µV under 20 µA load transients - critical for ratiometric sensor interfaces |
| Unconditional stability with capacitive loads | Permits direct connection to 10 µF ceramic bypass caps on ADC reference pins without oscillation risk |
| Green molding compound (Br/Sb-free) | Meets IPC-J-STD-609A Class 1 halogen-free requirements for industrial and medical PCB assemblies |
Applications
| Battery-Powered Instrumentation | Precision Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter with 16-bit sigma-delta ADC and coin-cell power supply. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.220 V reference for ADC conversion and sensor excitation. Use Value: 4 µA knee current extends battery life beyond 3 years; 20 ppm/°C tempco maintains ±0.02% reading accuracy across operating temperature range. | Use Scenario: Isolated industrial sensor node measuring strain gauge outputs with galvanically separated signal chain. IC Role / Device Role / Timing Role: Primary reference for isolated delta-sigma modulator and secondary reference for on-board LDO feedback. Use Value: Unconditional capacitive-load stability allows direct decoupling with 4.7 µF X7R ceramics, eliminating noise coupling into sensitive analog front-end. |
| Portable Communication Devices | Low-Power Sensor Interfaces |
Use Scenario: LTE-M modem module with integrated RF power detector requiring calibrated DC offset correction. IC Role / Device Role / Timing Role: Bias reference for logarithmic amplifier stage converting RF envelope to digital baseband signal. Use Value: 60 µVrms wideband noise ensures <0.1 dB measurement uncertainty in received signal strength indication (RSSI) circuitry. | Use Scenario: Wireless environmental sensor node (temperature/humidity) powered by solar harvester with intermittent 3.3 V rail. IC Role / Device Role / Timing Role: Reference for ultra-low-power SAR ADC sampling thermistor and capacitive humidity sensor. Use Value: Stable regulation down to 4 µA enables continuous sensing during low-light conditions when harvested current drops below 10 µA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXRE125CFSTZ | ±0.5% initial tolerance, same tempco and pinout | Required where 12-bit+ absolute accuracy is mandated without calibration | Select for metrology-grade portable calibrators and medical sensor front-ends |
| TLVH431AIDBVR | Adjustable 1.24 V reference, 2% tolerance, higher 80 µA min current | Used when programmable reference voltage or higher output current (>100 mA) is needed | Choose only if adjustable output or sink capability >15 mA is essential; not drop-in compatible |
Compared with ZXRE125DRSTZ, the CFSTZ variant improves absolute accuracy by 0.5% at cost of tighter test screening, while TLVH431AIDBVR trades micropower operation for programmability and higher drive strength - making it unsuitable for battery-life-critical designs but viable where flexibility outweighs current budget.
Availability
ZXRE125DRSTZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, precision data acquisition systems, and portable communication devices requiring stable component supply with guaranteed long-term sourcing.
Supply support for ZXRE125DRSTZ 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 stability, accuracy, and SOT23 compatibility are primary design constraints.
FAQ
What is the minimum operating current for ZXRE125DRSTZ?
The ZXRE125DRSTZ has a confirmed knee current of 4 µA - the lowest cathode current at which regulation is maintained within specification. Below this, output voltage drops nonlinearly. This value is verified in DS32170 Rev. 8–2, Electrical Characteristics table, IMIN parameter.
Can ZXRE125DRSTZ replace ZRA125 series devices?
Yes - ZXRE125DRSTZ is explicitly designed as a pin-for-pin, functionally equivalent replacement for ZRA125 series references. Both share identical SOT23-3 pinout, 1.22 V nominal output, and shunt topology. Diodes confirms compatibility in the device description section of DS32170.
Is ZXRE125DRSTZ stable with large capacitive loads?
Yes - the device is unconditionally stable with capacitive loads up to 10 µF, as stated in the Features section and validated in Typical Characteristics plots. No series resistor is required, simplifying layout in ADC reference and LDO feedback applications.
What does the 'D' in ZXRE125DRSTZ indicate?
The 'D' denotes ±1% initial output voltage tolerance at 25°C, per Diodes' ordering information table in DS32170. It corresponds to the 'D' grade in the ZXRE125 family, with 'C' = ±0.5%, 'E' = ±2%, and 'F' = ±3%.
ZXRE125DRSTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- E-Line-3
- Series:
- -
- Packaging:
- Tape & Box (TB)
- 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:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZXRE125DRSTZ FAQ
1.How can I place an order for ZXRE125DRSTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXRE125DRSTZ 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 ZXRE125DRSTZ reliable?
The price and inventory of ZXRE125DRSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE125DRSTZ is usually 5 days.
3.What payment methods are accepted for ZXRE125DRSTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE125DRSTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXRE125DRSTZ?
ZXRE125DRSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXRE125DRSTZ 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 ZXRE125DRSTZ?
For technical support, including ZXRE125DRSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE125DRSTZ requirements.
6.How does Aetrix verify that ZXRE125DRSTZ is sourced from the original manufacturer or authorized distributors?
All ZXRE125DRSTZ 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 ZXRE125DRSTZ meets industry standards.
7.What is the process for return or replacement of ZXRE125DRSTZ?
All ZXRE125DRSTZ units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE125DRSTZ, 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 ZXRE125DRSTZ part is unused and in its original packaging.
Return procedure for ZXRE125DRSTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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