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Diodes Incorporated ZXRE125DR
- Part No.:
- ZXRE125DR
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
ZXRE125DR.pdf
- Description:
- IC VREF SHUNT 1% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:3,375
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Product details
Overview
ZXRE125DR from Diodes Incorporated is a micropower bandgap voltage reference IC delivering a precise 1.220 V output with ±0.5% 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 precision analog front-ends.
For engineers reviewing the ZXRE125DR datasheet, ZXRE125DR pinout, ZXRE125DR application, or ZXRE125DR equivalent, key selection criteria include low knee current (4 µA), unconditional stability with capacitive loads, SOT23-3 package compatibility, and tight tolerance options for high-accuracy ADC/DAC biasing and sensor excitation circuits.
Technical Context
The ZXRE125DR implements a two-terminal bandgap reference topology operating in reverse breakdown mode, requiring no external bias resistor. It functions as a shunt reference with cathode-anode configuration, where the reference voltage appears across its terminals under controlled current sourcing.
Its design achieves thermal stability via curvature-compensated bandgap core and supports direct replacement of ZRA124/ZRA125 series. The device maintains regulation down to 4 µA minimum operating current and exhibits only 1 mV ΔVR variation from 30 µA to 1 mA load current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.220 V ±0.5% at 100 µA - defines accuracy-critical bias point for 12-bit+ data converters |
| Tempco | 20 ppm/°C typical - ensures ≤1.2 mV drift over –40°C to +85°C ambient range |
| Knee Current | 4 µA - enables ultra-low-power wake-up reference in energy-harvesting systems |
| Dynamic Impedance | 0.2 Ω at 1 mA - minimizes output perturbation during fast transient load steps |
| Noise (10Hz–10kHz) | 60 µVrms - suitable for 16-bit SAR ADC reference without external filtering |
| Capacitive Load Stability | Unconditionally stable - allows direct connection to 100 nF bypass caps without oscillation risk |
Pinout & Package
Package: SOT23-3 (JEDEC TO-236AB), 2.80 × 2.64 × 1.12 mm body, gull-wing leads, green molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Anode terminal | Connected to system ground; forms return path for reference current |
| Pin 2 (Cathode) | Cathode terminal | Output node where 1.220 V appears relative to Pin 1; connects to load and current source |
| Pin 3 (NC) | No-connect | Internally unconnected; must be left floating or tied to Pin 1 per datasheet guidance |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low knee current | 4 µA enables operation in sub-10 µA power budget systems like wireless sensor nodes |
| 0.5% initial tolerance option | Reduces or eliminates need for post-production calibration in portable medical devices |
| 20 ppm/°C tempco | Supports <±2 LSB error over industrial temperature range in 14-bit measurement systems |
| Unconditional stability | Eliminates need for external compensation networks when driving ADC input capacitance |
| SOT23-3 footprint | Direct drop-in replacement for legacy ZRA124/ZRA125 references without PCB redesign |
Applications
| Portable Gas Analyzers | Precision RTD Signal Conditioning |
|---|---|
Use Scenario: Battery-operated handheld gas detectors requiring stable bias for electrochemical sensor amplifiers over wide temperature ranges. IC Role / Device Role / Timing Role: Shunt voltage reference providing 1.220 V excitation and ADC reference for ratiometric sensor measurements. Use Value: 20 ppm/°C tempco ensures <0.5% full-scale error drift from –20°C to +60°C, meeting ISO 13849 functional safety requirements. | Use Scenario: 4-wire RTD measurement module in portable temperature calibrators needing low-drift reference for bridge excitation and ADC reference. IC Role / Device Role / Timing Role: Dual-role reference supplying matched 1.220 V to both RTD bridge and 24-bit delta-sigma ADC. Use Value: 0.2 Ω dynamic impedance prevents gain error shift during bridge current transients, maintaining <10 ppm linearity. |
| Low-Power Data Loggers | Medical ECG Front-Ends |
Use Scenario: Solar-charged environmental logger recording temperature/humidity every 5 minutes with 10-year target battery life. IC Role / Device Role / Timing Role: Micropower shunt reference enabling <1 µA sleep-mode current while retaining fast wake-up reference stability. Use Value: 4 µA knee current allows use with high-value discharge resistors, extending shelf life of primary lithium cells by >30%. | Use Scenario: Portable ECG monitor requiring ultra-low-noise analog signal chain for sub-µV biopotential acquisition. IC Role / Device Role / Timing Role: Low-noise (60 µVrms) reference for PGA gain-setting and 16-bit SAR ADC reference rail. Use Value: 60 µVrms broadband noise contributes <0.5 LSB noise floor in 16-bit conversion, preserving diagnostic resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AIDBZR | Adjustable (2.5 V min), 2% initial tol, 50 ppm/°C tempco, 80 µA min cathode current | Requires external resistor network; higher power consumption limits ultra-low-power use | Preferred when adjustable reference voltage or higher output current (>100 mA) is required |
| MAX6012AEUR+T | Fixed 1.25 V, 0.2% tol, 30 ppm/°C, 35 µA min operating current, SC70-3 package | Tighter tolerance but higher knee current reduces suitability for sub-10 µA systems | Chosen when absolute accuracy dominates over micropower constraints |
Compared with TLVH431AIDBZR and MAX6012AEUR+T, the ZXRE125DR uniquely balances 0.5% tolerance, 4 µA knee current, and SOT23-3 compatibility - making it optimal for space-constrained, battery-life-critical applications where fixed 1.22 V is acceptable.
Availability
ZXRE125DR is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered medical devices, and precision data acquisition systems requiring stable component supply with long-term lifecycle support.
Supply support for ZXRE125DR 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 ZXRE125DR belongs to Diodes' precision voltage reference product line, engineered specifically for ultra-low-power, high-stability analog signal conditioning in portable and energy-constrained systems.
FAQ
What is the correct biasing configuration for ZXRE125DR?
The ZXRE125DR operates as a two-terminal shunt reference: Pin 1 (anode) connects to ground, Pin 2 (cathode) connects to both the current source and load. Pin 3 is internally unconnected and must remain floating or tied to Pin 1. A series resistor sets the operating current between 4 µA and 20 mA based on supply voltage and load requirements.
Can ZXRE125DR drive a 100 nF capacitor directly?
Yes - the ZXRE125DR is unconditionally stable and explicitly characterized for direct connection to ≥100 nF capacitive loads without external compensation. This capability simplifies layout in ADC reference decoupling and eliminates risk of oscillation seen in many competing shunt references.
How does ZXRE125DR compare to ZRA125 in pin compatibility?
The ZXRE125DR is pin-for-pin compatible with ZRA125 in SOT23-3 packaging: Pin 1 (anode), Pin 2 (cathode), and Pin 3 (NC) match identically. Electrical specs exceed ZRA125 with lower knee current (4 µA vs. 10 µA) and improved tempco (20 ppm/°C vs. 50 ppm/°C), enabling direct replacement without circuit modification.
Is ZXRE125DR suitable for automotive applications?
No - the ZXRE125DR is rated for –40°C to +85°C operating temperature and lacks AEC-Q200 qualification. While it meets industrial temperature range requirements, it is not approved for automotive under-hood or safety-critical systems. Diodes' AP2112K or AZ1084 series are recommended for qualified automotive voltage references.
ZXRE125DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- 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:
- TO-92
ZXRE125DR FAQ
1.How can I place an order for ZXRE125DR through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXRE125DR 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 ZXRE125DR reliable?
The price and inventory of ZXRE125DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE125DR is usually 5 days.
3.What payment methods are accepted for ZXRE125DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE125DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXRE125DR?
ZXRE125DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXRE125DR 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 ZXRE125DR?
For technical support, including ZXRE125DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE125DR requirements.
6.How does Aetrix verify that ZXRE125DR is sourced from the original manufacturer or authorized distributors?
All ZXRE125DR 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 ZXRE125DR meets industry standards.
7.What is the process for return or replacement of ZXRE125DR?
All ZXRE125DR units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE125DR, 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 ZXRE125DR part is unused and in its original packaging.
Return procedure for ZXRE125DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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