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Diodes Incorporated ZXRE125CFTC
- Part No.:
- ZXRE125CFTC
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZXRE125CFTC.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,896
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Product details
Overview
ZXRE125CFTC 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 portable data acquisition systems.
For engineers reviewing the ZXRE125CFTC datasheet, ZXRE125CFTC pinout, ZXRE125CFTC application, or ZXRE125CFTC equivalent, key selection criteria include low knee current (4 µA), unconditionally stable performance with capacitive loads, SOT23-3 package compatibility, and direct replacement capability for ZRA124/ZRA125 series references.
Technical Context
The ZXRE125CFTC implements a two-terminal bandgap reference architecture operating in reverse breakdown mode, requiring no external biasing components. Its internal design achieves low dynamic impedance (0.2–0.6 Ω at 1 mA) and wideband noise of 60 µVrms (10 Hz–10 kHz), enabling high-accuracy ADC/DAC reference and precision regulator feedback applications.
It maintains specified performance across −40°C to +85°C ambient temperature and supports capacitive loads up to 10 µF without oscillation - a result of intrinsic phase margin optimization rather than external compensation requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.220 V ±0.5% at 25°C - defines absolute accuracy baseline for 12-bit+ measurement systems |
| Tempco | 20 ppm/°C typical - ensures ≤±1.2 mV drift over −40°C to +85°C operating range |
| Knee Current | 4 µA - enables ultra-low-power wake-up reference operation in sleep-mode sensor nodes |
| Dynamic Impedance | 0.2 Ω (min) at 1 mA - minimizes load-induced voltage error in high-precision feedback loops |
| Noise (10Hz–10kHz) | 60 µVrms - supports sub-LSB stability in 16-bit SAR ADC reference paths |
| Operating Current Range | 4 µA to 20 mA - accommodates both energy-harvesting microcurrent and standard rail-sourced biasing |
| Capacitive Load Stability | Unconditionally stable - eliminates need for series resistor or external compensation in all PCB layouts |
Pinout & Package
SOT23-3 package: 3-pin surface-mount plastic case with gull-wing leads, 0.95 mm lead pitch, 2.80 × 2.64 × 1.12 mm body dimensions, RoHS-compliant green molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (cathode-connected terminal) | Connected to system ground or low-side return path; floating allowed per datasheet but not recommended for production |
| Pin 2 | Cathode (output/reference node) | Delivers regulated 1.220 V; must be decoupled locally for noise-sensitive applications |
| Pin 3 | Anode (redundant connection) | Internally tied to Pin 1; may be left floating or shorted to Pin 1 to reduce trace inductance |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low knee current | 4 µA enables operation in energy-constrained IoT sensor nodes without compromising regulation |
| 0.5% initial tolerance | Eliminates post-manufacturing trimming in portable medical monitors and handheld test equipment |
| 20 ppm/°C tempco | Meets industrial-grade accuracy requirements without external calibration over full temperature range |
| Unconditional capacitive stability | Removes design risk from layout-dependent instability in compact PCBs with high-density decoupling |
| SOT23-3 footprint | Direct drop-in replacement for legacy ZRA124/ZRA125 references without board rework |
Applications
| Battery-Powered Portable Meters | Precision Low-Power ADC Reference |
|---|---|
Use Scenario: Handheld multimeters and clamp meters operating from single-cell Li-ion or alkaline batteries with intermittent active measurement cycles. IC Role / Device Role / Timing Role: Two-terminal voltage reference providing stable excitation for analog front-end gain stages and ADC reference input. Use Value: 4 µA knee current extends battery life beyond 12 months in standby; 0.5% tolerance avoids factory calibration per unit. | Use Scenario: 16-bit SAR ADC subsystems in wireless sensor nodes where reference noise directly limits effective resolution. IC Role / Device Role / Timing Role: Low-noise, low-drift reference source for ADC VREF pin, replacing higher-power TL431-based solutions. Use Value: 60 µVrms noise and 0.2 Ω impedance preserve ENOB >15.2 bits; unconditionally stable behavior prevents layout-dependent errors. |
| Portable Medical Monitoring Devices | Industrial Data Acquisition Modules |
Use Scenario: Wearable ECG and pulse oximetry units requiring clinical-grade signal integrity under variable temperature and battery voltage. IC Role / Device Role / Timing Role: Primary reference for analog signal conditioning chain, including instrumentation amplifier biasing and ADC reference. Use Value: 20 ppm/°C tempco ensures <±0.5 mV error across patient-body-temperature range; green compound meets IEC 61000-6-4 EMC compliance requirements. | Use Scenario: DIN-rail mounted analog input modules acquiring 4–20 mA loop signals in factory automation environments. IC Role / Device Role / Timing Role: Precision shunt reference for current-to-voltage conversion and isolated ADC reference in multi-channel systems. Use Value: Stable 1.220 V output enables ±0.1% full-scale accuracy across −25°C to +70°C operating range; SOT23-3 allows dense channel packing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AIDBZR | 3-terminal adjustable shunt regulator (2.5 V min); requires external resistors; 100 ppm/°C tempco | Needs redesign for fixed 1.22 V output; higher noise (120 µVrms) | Choose only if system already uses TLVH431 and adjustable output is acceptable |
| MAX6012AEUR+T | 1.22 V fixed reference; 15 ppm/°C max tempco; 1.5 µA quiescent current; SC70-3 package | Lower tempco but smaller package limits thermal mass and increases sensitivity to PCB heating | Prefer when tighter tempco is critical and board layout permits SC70 thermal management |
Compared with TLVH431AIDBZR and MAX6012AEUR+T, the ZXRE125CFTC offers optimal balance of ultra-low knee current, proven SOT23 thermal robustness, and pin-compatible legacy replacement - making it ideal for cost-sensitive, space-constrained, and field-deployed instrumentation where long-term stability outweighs marginal tempco improvements.
Availability
ZXRE125CFTC is available at Aetrix Electronics and suitable for battery-powered portable meters, precision low-power ADC reference designs, and portable medical monitoring devices requiring stable component supply with guaranteed long-term continuity.
Supply support for ZXRE125CFTC 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 for industrial and consumer markets.
The ZXRE125 series belongs to Diodes' precision voltage reference product line, engineered specifically for ultra-low-power, high-stability applications in portable and battery-operated instrumentation where minimal quiescent current and predictable thermal behavior are essential.
FAQ
What is the minimum operating current required for ZXRE125CFTC to maintain regulation?
The ZXRE125CFTC achieves stable regulation starting at 4 µA (knee current), verified across −40°C to +85°C. Below this, output voltage drops nonlinearly. For guaranteed 0.5% accuracy, ≥8 µA is recommended per datasheet electrical characteristics table.
Can ZXRE125CFTC drive a 10 µF ceramic capacitor directly without oscillation?
Yes - the device is unconditionally stable with capacitive loads up to at least 10 µF, as confirmed by Diodes' typical characteristics plots and stability testing in DS32170 Rev. 8-2. No series resistance or isolation is required, even with X7R/X5R dielectrics.
Is ZXRE125CFTC pin-compatible with ZRA125 series devices?
Yes - ZXRE125CFTC uses identical SOT23-3 pinout and electrical interface as ZRA125 devices. Pin 1 and Pin 3 are internally connected anodes; Pin 2 is cathode/output. No PCB changes are needed for drop-in replacement.
Does ZXRE125CFTC require any external components for basic operation?
No - it operates as a true two-terminal device: connect Pin 1 and Pin 3 to system ground (or leave Pin 3 floating), and Pin 2 to the reference node. A local 100 nF ceramic capacitor is recommended but not mandatory for noise suppression in sensitive applications.
ZXRE125CFTC 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:
- Obsolete
- 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
ZXRE125CFTC FAQ
1.How can I place an order for ZXRE125CFTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXRE125CFTC 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 ZXRE125CFTC reliable?
The price and inventory of ZXRE125CFTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE125CFTC is usually 5 days.
3.What payment methods are accepted for ZXRE125CFTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE125CFTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXRE125CFTC?
ZXRE125CFTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXRE125CFTC 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 ZXRE125CFTC?
For technical support, including ZXRE125CFTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE125CFTC requirements.
6.How does Aetrix verify that ZXRE125CFTC is sourced from the original manufacturer or authorized distributors?
All ZXRE125CFTC 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 ZXRE125CFTC meets industry standards.
7.What is the process for return or replacement of ZXRE125CFTC?
All ZXRE125CFTC units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE125CFTC, 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 ZXRE125CFTC part is unused and in its original packaging.
Return procedure for ZXRE125CFTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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