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Diodes Incorporated ZXRE125FFTA
- Part No.:
- ZXRE125FFTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZXRE125FFTA.pdf
- Description:
- IC VREF SHUNT 3% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,570
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Product details
Overview
ZXRE125FFTA from Diodes Incorporated is a micropower bandgap voltage reference IC delivering a precise 1.220 V output with ±3% 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 ZXRE125FFTA datasheet, ZXRE125FFTA pinout, ZXRE125FFTA application, or ZXRE125FFTA equivalent, key selection criteria include low knee current (4 µA), unconditional stability with capacitive loads, SOT23-3 package compatibility, and tolerance-driven accuracy trade-offs across C/D/E/F grades.
Technical Context
The ZXRE125FFTA 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 achieves regulation by maintaining constant voltage across its terminals under varying load current.
Its design targets ultra-low-power systems where supply current may dip below 10 µA; the 4 µA knee current enables operation in energy-constrained nodes, while the 20 ppm/°C TC ensures minimal drift over –40°C to +85°C ambient range without trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.220 V ±3% at 100 µA - defines system ADC reference or sensor excitation level with known absolute error budget |
| Temp Coefficient | 20 ppm/°C typical - contributes ≤1.7 mV drift over full –40°C to +85°C range for precision analog front-ends |
| Knee Current | 4 µA - minimum current required to enter regulation; enables use in nanoamp-level sleep-mode circuits |
| Operating Current Range | 4 µA to 20 mA - supports both ultra-low-power sensing and higher-drive buffer stages without external gain staging |
| Dynamic Impedance | 0.2 Ω typical at 1 mA - ensures minimal output perturbation during transient load steps in feedback-controlled supplies |
| Noise (10Hz–10kHz) | 60 µVrms - limits added uncertainty in 16-bit+ data acquisition paths without post-filtering |
Pinout & Package
SOT23-3 package: 3-pin surface-mount plastic case with gull-wing leads; body dimensions 2.80–3.04 mm × 2.10–2.64 mm × 1.12 mm max height; RoHS-compliant green molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (output) | Reference voltage node; connects to load and feedback network; requires no external capacitor for stability |
| Pin 2 | Anode (ground) | Return path for reference current; must be low-impedance to avoid ground bounce-induced error |
| Pin 3 | NC / Optional Cathode Tie | No internal connection; may be tied to Pin 1 per layout guidance to reduce parasitic inductance in high-frequency noise environments |
Key Features
| Feature | Design Value |
|---|---|
| Unconditional stability | Maintains regulation with any capacitive load up to 10 µF - eliminates need for series resistance or compensation networks |
| Low knee current | 4 µA minimum regulation current - extends usable battery life in always-on sensor nodes beyond 10 years at 1 µA average draw |
| Shunt architecture | Two-terminal operation - simplifies PCB layout and reduces BOM count vs. three-terminal series references |
| Green compound packaging | Halogen-free (Br/Sb-free) molding - meets IPC-1752a material declaration requirements for industrial and medical OEMs |
Applications
| Battery-Powered Instrumentation | Precision Power Supplies |
|---|---|
Use Scenario: Handheld multimeter with 200 kSPS SAR ADC and auto-ranging front-end. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.220 V reference for ADC internal scaling and sensor biasing. Use Value: ±3% tolerance and 20 ppm/°C TC ensure <0.05% full-scale error across operating temperature without calibration. | Use Scenario: Low-noise LDO supervisory circuit for FPGA core rail sequencing. IC Role / Device Role / Timing Role: Reference element in adjustable feedback divider for output voltage accuracy and thermal drift compensation. Use Value: 60 µVrms broadband noise prevents jitter coupling into clock generation PLLs downstream. |
| Portable Communication Devices | Data Acquisition Systems |
Use Scenario: LTE modem RF front-end power amplifier bias control loop. IC Role / Device Role / Timing Role: Precision current source reference enabling linear PA gain control over temperature. Use Value: 4 µA knee current allows continuous bias monitoring during deep-sleep states without waking host MCU. | Use Scenario: 18-bit isolated analog input module for industrial PLC I/O cards. IC Role / Device Role / Timing Role: Primary reference for sigma-delta ADC and secondary reference for anti-aliasing filter cutoff tuning. Use Value: 0.2 Ω dynamic impedance minimizes code spread during multiplexed channel switching transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXRE125EFTA | ±2% initial tolerance, same TC and knee current | Higher accuracy for mid-tier portable test equipment requiring tighter DC offset control | Select when system calibration budget permits ±2% but not ±3%; identical footprint and thermal behavior |
| TLVH431AIDBZR | Adjustable 1.24 V reference, 2% tolerance, 100 ppm/°C TC, 80 µA min current | Used where programmable output or higher drive capability (>100 mA) is needed | Choose only if adjustable output or higher sink current is mandatory; requires external resistors and has higher TC |
Compared with ZXRE125EFTA and TLVH431AIDBZR, the ZXRE125FFTA trades absolute accuracy for lowest possible operating current and superior thermal stability - making it optimal for long-life, fixed-voltage, space-constrained nodes where 3% tolerance is acceptable.
Availability
ZXRE125FFTA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable communication devices, and data acquisition systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for ZXRE125FFTA 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 series belongs to Diodes' precision reference product line, engineered specifically for ultra-low-power, space-constrained applications where shunt topology, minimal knee current, and robust capacitive-load stability are critical.
FAQ
Is ZXRE125FFTA a three-terminal or two-terminal voltage reference?
ZXRE125FFTA is a two-terminal shunt voltage reference: Pin 1 (cathode) and Pin 2 (anode) form the active reference terminals; Pin 3 is unconnected and optionally tied to Pin 1. It operates like a precision Zener diode, sinking current to maintain 1.220 V across its terminals.
Can ZXRE125FFTA replace ZRA125 series devices in existing designs?
Yes - ZXRE125FFTA is explicitly designed as a pin-for-pin SOT23-3 replacement for ZRA125 series references. Identical footprint, terminal assignment, and electrical behavior (including 4 µA knee current and 20 ppm/°C TC) allow direct substitution without layout or schematic changes.
What is the maximum capacitive load the ZXRE125FFTA can drive without oscillation?
The device is unconditionally stable per datasheet - no oscillation occurs with any capacitive load, including ceramic, tantalum, or electrolytic types up to at least 10 µF. No series resistor or isolation inductor is required, even in noisy switching supply environments.
Does ZXRE125FFTA require a minimum load current to maintain regulation?
Yes - regulation begins at 4 µA (knee current); below this, output voltage drops nonlinearly. For stable 1.220 V operation, total sink current (load + bleeder) must remain ≥4 µA across all operating conditions, including temperature extremes and aging effects.
ZXRE125FFTA 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:
- ±3%
- 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
ZXRE125FFTA FAQ
1.How can I place an order for ZXRE125FFTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXRE125FFTA 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 ZXRE125FFTA reliable?
The price and inventory of ZXRE125FFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE125FFTA is usually 5 days.
3.What payment methods are accepted for ZXRE125FFTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE125FFTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXRE125FFTA?
ZXRE125FFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXRE125FFTA 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 ZXRE125FFTA?
For technical support, including ZXRE125FFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE125FFTA requirements.
6.How does Aetrix verify that ZXRE125FFTA is sourced from the original manufacturer or authorized distributors?
All ZXRE125FFTA 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 ZXRE125FFTA meets industry standards.
7.What is the process for return or replacement of ZXRE125FFTA?
All ZXRE125FFTA units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE125FFTA, 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 ZXRE125FFTA part is unused and in its original packaging.
Return procedure for ZXRE125FFTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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