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Diodes Incorporated ZXRE125CFTA
- Part No.:
- ZXRE125CFTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZXRE125CFTA.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:6,788
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Product details
Overview
ZXRE125CFTA 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 signal chains.
For engineers reviewing the ZXRE125CFTA datasheet, ZXRE125CFTA pinout, ZXRE125CFTA application, or ZXRE125CFTA equivalent, key selection criteria include low knee current (4 µA), unconditional stability with capacitive loads, SOT23-3 package compatibility, and tight tolerance for calibration-critical portable systems.
Technical Context
The ZXRE125CFTA 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 configuration and exhibits unconditionally stable behavior up to 1 µF capacitive load.
Its thermal design achieves 20 ppm/°C typical TC over –40°C to +85°C, with reverse breakdown voltage specified at IR = 100 µA. The device maintains <1 mV ΔVR across 30 µA–12 mA operating current range and delivers 0.6 Ω dynamic impedance at 1 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.220 V ±0.5% at IR = 100 µA - enables high-accuracy ADC/DAC biasing without trimming |
| Tempco (TC) | 20 ppm/°C typical - ensures ≤1.2 mV drift over full industrial temperature range |
| Knee Current (IMIN) | 4 µA - supports ultra-low-power wake-up circuits and energy-harvesting sensors |
| Operating Current Range | 4 µA to 20 mA - accommodates both standby and active-mode regulation in portable systems |
| Dynamic Impedance | 0.6 Ω at 1 mA, 100 Hz - minimizes output perturbation under dynamic load transients |
| Wideband Noise | 60 µVrms, 10 Hz–10 kHz - suitable for 12-bit+ precision measurement front-ends |
| Capacitive Load Stability | Unconditionally stable up to 1 µF - eliminates need for series resistance or compensation networks |
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 anode terminal | Connected to system ground; forms return path for reference current |
| Pin 2 (Cathode) | Reference cathode terminal | Provides regulated 1.220 V output node; connects to load and feedback network |
| Pin 3 (NC / Anode Tie) | No-connect (optional tie to Pin 1) | Internally unused; may be shorted to Pin 1 for mechanical reinforcement per datasheet guidance |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low knee current | 4 µA enables operation in sub-10 µA power domains (e.g., RTC backup, sensor sleep modes) |
| 0.5% initial tolerance | Eliminates post-manufacture calibration in portable medical and test equipment |
| 20 ppm/°C tempco | Meets ±2 LSB drift requirement for 12-bit SAR ADCs over –40°C to +85°C |
| Unconditional stability | Supports direct connection to ADC reference inputs or op-amp feedback without external compensation |
| SOT23-3 footprint | Matches ZRA124/ZRA125 pinout for drop-in replacement in legacy designs |
Applications
| Battery-Powered Multimeters | Precision RTD Signal Conditioning |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable reference for 4½-digit DC voltage measurement across temperature. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and scaling for dual-slope ADC integrator. Use Value: 0.5% tolerance and 20 ppm/°C TC ensure <0.01% full-scale error without factory recalibration. | Use Scenario: Industrial temperature transmitter using 3-wire RTD with 24-bit ΣΔ ADC. IC Role / Device Role / Timing Role: Precision excitation current source reference and ADC voltage reference sharing common node. Use Value: Ultra-low 4 µA knee current allows biasing from same LDO supplying microcontroller, reducing BOM count. |
| Portable ECG Front-End | Low-Power Data Loggers |
Use Scenario: Battery-operated wearable ECG monitor with analog front-end gain/offset calibration. IC Role / Device Role / Timing Role: Reference for programmable gain amplifier (PGA) offset nulling and ADC full-scale setting. Use Value: 60 µVrms noise floor preserves SNR in 100 dB dynamic range biomedical acquisition. | Use Scenario: Solar-powered environmental data logger sampling temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Reference for microcontroller's internal ADC during brief active measurement bursts. Use Value: Stable 1.220 V output at 4 µA enables >10-year battery life with minimal voltage drift between samples. |
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 1.24 V reference; requires two external resistors; 90 ppm/°C TC; 80 µA min current | Not pin-compatible; higher power and drift; suited for programmable supplies, not fixed-precision sensing | Select only when adjustable output or higher current drive is required |
| REF191GSZ-REEL | Series reference; 1.25 V output; 3 ppm/°C TC; 600 µA quiescent; SOIC-8 package | Higher accuracy but larger size and 150× higher supply current; requires input headroom | Choose for lab-grade instrumentation where ultra-low TC outweighs size/power penalties |
Compared with TLVH431AIDBZR and REF191GSZ-REEL, the ZXRE125CFTA uniquely balances ultra-low power (4 µA), SOT23-3 footprint, and 0.5% tolerance - making it optimal for space-constrained, battery-limited applications where fixed 1.22 V is acceptable.
Availability
ZXRE125CFTA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and precision data acquisition systems requiring stable component supply with guaranteed long-term continuity.
Supply support for ZXRE125CFTA 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 solutions for power management, signal integrity, and protection.
The ZXRE125 belongs to Diodes' precision voltage reference product line, engineered specifically for micropower, space-constrained applications demanding stable reference performance without external compensation.
FAQ
What is the minimum operating current for reliable regulation?
The ZXRE125CFTA achieves stable regulation at a minimum current of 4 µA (knee current), verified per DS32170 Rev. 8–2. Below this, output voltage drops nonlinearly. For guaranteed 0.5% accuracy, operation ≥8 µA is recommended per electrical characteristics table.
Can ZXRE125CFTA drive a 10 nF capacitor directly?
Yes - the device is unconditionally stable with capacitive loads up to 1 µF, as confirmed in the datasheet's "Unconditionally stable" feature and typical characteristics plots. A 10 nF capacitor introduces no risk of oscillation and improves high-frequency noise rejection without external series resistance.
Is ZXRE125CFTA pin-compatible with ZRA125 series devices?
Yes - the ZXRE125CFTA uses identical SOT23-3 pinout and electrical interface as ZRA124/ZRA125 devices, enabling direct PCB-level replacement. Pin 1 (anode), Pin 2 (cathode), and Pin 3 (NC/tie) match functionally and mechanically per Diodes' ordering information and package outline diagrams.
Does ZXRE125CFTA require a heatsink in 330 mW power dissipation scenarios?
No - the 330 mW absolute maximum power dissipation rating applies only at TAMB = 25°C with zero thermal resistance. In practice, at 20 mA × 1.22 V = 24.4 mW, junction temperature rise is negligible (<2°C) in SOT23-3 on standard FR-4, eliminating any heatsink requirement.
ZXRE125CFTA 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:
- ±0.5%
- 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
ZXRE125CFTA FAQ
1.How can I place an order for ZXRE125CFTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXRE125CFTA 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 ZXRE125CFTA reliable?
The price and inventory of ZXRE125CFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE125CFTA is usually 5 days.
3.What payment methods are accepted for ZXRE125CFTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE125CFTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXRE125CFTA?
ZXRE125CFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXRE125CFTA 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 ZXRE125CFTA?
For technical support, including ZXRE125CFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE125CFTA requirements.
6.How does Aetrix verify that ZXRE125CFTA is sourced from the original manufacturer or authorized distributors?
All ZXRE125CFTA 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 ZXRE125CFTA meets industry standards.
7.What is the process for return or replacement of ZXRE125CFTA?
All ZXRE125CFTA units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE125CFTA, 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 ZXRE125CFTA part is unused and in its original packaging.
Return procedure for ZXRE125CFTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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