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Diodes Incorporated ZXRE125ERSTOA
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- Part No.:
- ZXRE125ERSTOA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- E-Line-3
- Datasheet:
-
ZXRE125ERSTOA.pdf
- Description:
- IC VREF SHUNT 2% E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:2,359
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Product details
Overview
ZXRE125ERSTOA from Diodes Incorporated is a micropower bandgap voltage reference 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 portable instrumentation and battery-powered precision analog signal chains.
For engineers reviewing the ZXRE125ERSTOA datasheet, ZXRE125ERSTOA pinout, ZXRE125ERSTOA application, or ZXRE125ERSTOA equivalent, key selection criteria include low knee current (4 µA), unconditional stability with capacitive loads, SOT23-3 package compatibility, and tight thermal drift for low-power sensor biasing and ADC reference design.
Technical Context
The ZXRE125ERSTOA implements a two-terminal shunt topology with reverse-biased bandgap core, operating as a precision 1.22 V breakdown reference across 8 µA–20 mA load current. Its design eliminates need for external series resistor in many configurations due to ultra-low knee current and wide dynamic range.
It achieves 20 ppm/°C typical TC over –40°C to +85°C via curvature-compensated bandgap architecture and exhibits 0.2 Ω typical dynamic impedance at 1 mA, enabling high PSRR and low noise (60 µVrms, 10 Hz–10 kHz) in sensitive measurement circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.220 V ±2% (E-grade); enables accurate 12-bit ADC reference without trimming |
| Initial Tolerance | ±2% (E-grade); specified at 25°C, IR = 100 µA; reduces calibration overhead |
| Temp Coefficient | 20 ppm/°C typical; ensures <±1.7 mV drift over –40°C to +85°C for portable systems |
| Knee Current | 4 µA typical; allows operation from coin-cell or energy-harvesting sources |
| Dynamic Impedance | 0.2 Ω typical at 1 mA; maintains regulation under fast load transients |
| Wideband Noise | 60 µVrms (10 Hz–10 kHz); supports low-noise sensor front-ends and precision DACs |
| Capacitive Load Stability | Unconditionally stable; no minimum ESR or external compensation required |
Pinout & Package
Supplied in SOT23-3 package (JEDEC TO-236AB), 2.80 × 2.10 × 1.12 mm body, gull-wing leads, green molding compound (Br/Sb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Reference output / cathode connection point | Connected to system ground in standard shunt configuration; may float or tie to Pin 2 per layout |
| Pin 2 (Cathode) | Input terminal / voltage sense node | Receives unregulated input; sets reference current via external resistor; primary regulation node |
| Pin 3 (NC) | No-connect terminal | Internally unused; must remain floating or be left unconnected per datasheet guidance |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low knee current | 4 µA typical enables operation from microampere-level power rails |
| Shunt topology with no external bias | Self-contained regulation; eliminates need for op-amp buffer or series pass element |
| Capacitive-load immunity | Stable with >10 µF ceramic output capacitance - simplifies filtering in space-constrained PCBs |
| Green packaging | Halogen-free, RoHS-compliant SOT23-3 housing meets industrial environmental compliance |
| Pin-compatible replacement | Direct drop-in for ZRA124/ZRA125 series - preserves legacy board designs |
Applications
| Battery-Powered Sensors | Precision Data Acquisition |
|---|---|
Use Scenario: Low-power gas sensor module powered by CR2032 coin cell with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Shunt voltage reference for 16-bit sigma-delta ADC and analog front-end biasing. Use Value: 4 µA knee current extends battery life; ±2% tolerance avoids factory calibration; 20 ppm/°C TC ensures accuracy across outdoor temperature swings. |
Use Scenario: Portable handheld multimeter with dual-slope ADC and auto-ranging analog circuitry. IC Role / Device Role / Timing Role: Primary reference source for ADC conversion and internal DAC trimming. Use Value: 60 µVrms noise floor supports 5½-digit resolution; unconditional stability prevents oscillation during range switching. |
| Portable Medical Monitors | Industrial IoT Edge Nodes |
Use Scenario: Wearable pulse oximeter with optical front-end and low-voltage MCU. IC Role / Device Role / Timing Role: Reference for photodiode transimpedance amplifier and LED current control DAC. Use Value: 1.220 V output matches common 1.2 V LDO domains; SOT23-3 footprint minimizes PCB area in compact flex assembly. |
Use Scenario: Wireless temperature/humidity node using energy harvesting and sub-1V MCU sleep states. IC Role / Device Role / Timing Role: Stable reference for RTD bridge excitation and SAR ADC sampling. Use Value: Operates down to 4 µA - compatible with nanoampere quiescent regulators; ±2% tolerance accommodates wide supply variation in harvested power paths. |
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 1.24 V reference; requires two external resistors; 50 ppm/°C TC; 80 µA min cathode current | Used where programmability or tighter absolute voltage isn't required; higher current demand limits ultra-low-power use | Select when adjustable output or higher output voltage (≥1.24 V) is needed; avoid for sub-10 µA systems |
| MAX6008AEUR+T | Fixed 1.25 V; 15 ppm/°C max TC; 3.5 µA max quiescent; SC70-3 package; higher cost | Preferred in medical-grade designs requiring tighter TC spec and AEC-Q200 alignment | Choose for <15 ppm/°C guaranteed TC and automotive-qualified supply chain; not pin-compatible |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, ZXRE125ERSTOA offers the lowest knee current (4 µA) and true pin-for-pin compatibility with legacy ZRA-series references, making it optimal for cost-sensitive, space-constrained, and ultra-low-power shunt reference upgrades without layout change.
Availability
ZXRE125ERSTOA is available at Aetrix Electronics and suitable for battery-powered sensors, portable instrumentation, and precision data acquisition systems requiring stable component supply with long-term obsolescence mitigation.
Supply support for ZXRE125ERSTOA 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, cost-optimized components for industrial, computing, and consumer markets.
The ZXRE125 belongs to Diodes' precision voltage reference product line, engineered specifically for micropower, space-constrained applications where low knee current, thermal stability, and SOT23 compatibility are critical.
FAQ
What is the minimum operating current for ZXRE125ERSTOA?
The ZXRE125ERSTOA has a typical knee current of 4 µA, with guaranteed operation down to 8 µA across temperature. It remains functional below 4 µA but may exhibit increased voltage deviation; design margin should maintain ≥8 µA for full-spec performance per DS32170 Rev. 8–2.
Can ZXRE125ERSTOA drive a 10 µF ceramic capacitor directly?
Yes - the device is unconditionally stable and explicitly characterized for capacitive loads up to and beyond 10 µF. No series resistance or damping network is required, enabling direct connection to bulk decoupling caps in portable designs without risk of oscillation.
Is ZXRE125ERSTOA pin-compatible with ZRA125 series devices?
Yes - ZXRE125ERSTOA is designed as a direct pin-for-pin replacement for ZRA124 and ZRA125 series voltage references in SOT23-3 packages, including identical pin 1/anode, pin 2/cathode, and pin 3/NC assignments and electrical interface behavior.
What does the 'E' in ZXRE125ERSTOA signify?
The 'E' denotes ±2% initial tolerance grade at 25°C, per Diodes' ordering nomenclature. The full part number breaks down as: ZXRE125 (base), E (tolerance), R (tape/reel), ST (SOT23), OA (standard marking and green compound per JEDEC standards).
ZXRE125ERSTOA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- E-Line-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:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZXRE125ERSTOA FAQ
1.How can I place an order for ZXRE125ERSTOA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXRE125ERSTOA 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 ZXRE125ERSTOA reliable?
The price and inventory of ZXRE125ERSTOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE125ERSTOA is usually 5 days.
3.What payment methods are accepted for ZXRE125ERSTOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE125ERSTOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXRE125ERSTOA?
ZXRE125ERSTOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXRE125ERSTOA 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 ZXRE125ERSTOA?
For technical support, including ZXRE125ERSTOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE125ERSTOA requirements.
6.How does Aetrix verify that ZXRE125ERSTOA is sourced from the original manufacturer or authorized distributors?
All ZXRE125ERSTOA 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 ZXRE125ERSTOA meets industry standards.
7.What is the process for return or replacement of ZXRE125ERSTOA?
All ZXRE125ERSTOA units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE125ERSTOA, 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 ZXRE125ERSTOA part is unused and in its original packaging.
Return procedure for ZXRE125ERSTOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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