My Inquiry
My Account
Diodes Incorporated ZRC400A02STOB
- Part No.:
- ZRC400A02STOB
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
ZRC400A02STOB.pdf
- Description:
- IC VREF SHUNT 2% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,970
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ZRC400A02STOB from Diodes Incorporated is a precision micropower 4.096 V bandgap voltage reference in SOT23-3 package, designed as a stable, low-knee-current (18 µA typ) reference for analog signal chains and ADC/DAC biasing. It operates from 23 µA to 5 mA, delivers ±2% initial tolerance, 30 ppm/°C typical temperature coefficient, and achieves stable output in <10 µs without external capacitor.
For engineers reviewing the ZRC400A02STOB datasheet, ZRC400A02STOB pinout, ZRC400A02STOB application, or ZRC400A02STOB equivalent, key selection criteria include knee current, TC stability over –40°C to +85°C, load capacitance immunity, transient response time, and SOT23-3 footprint compatibility in space-constrained portable designs.
Technical Context
The ZRC400A02STOB implements a two-terminal shunt topology with internal bandgap core, operating in reverse breakdown mode. Its 4.096 V reference is trimmed at wafer level for ±2% accuracy and exhibits monotonic TC behavior across industrial temperature range.
It maintains regulation under capacitive loads up to 10 µF and withstands transient currents up to 200 mA due to rugged 20 V process design. Slope resistance is 0.4 Ω typical, enabling low-noise operation (90 µVrms, 10 Hz–10 kHz) with minimal line/load regulation error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 4.096 V ±2% - precise mid-scale reference for 12-bit ADCs and DACs |
| Initial Tolerance | ±2% - enables single-point calibration in metering systems |
| Temp Coefficient | 30 ppm/°C typical - ensures ≤1.2 mV drift over –40°C to +85°C |
| Knee Current | 18 µA typical - supports ultra-low-power wake-up circuits and coin-cell applications |
| Slope Resistance | 0.4 Ω typical - minimizes output voltage shift under dynamic load changes |
| Transient Response | <10 µs settling - suitable for fast-sampling data acquisition systems |
| Operating Current | 23 µA to 5 mA - compatible with both microamp sleep modes and 10-bit SAR ADC biasing |
Pinout & Package
Package: SOT23-3 (suffix F), surface-mount, 3-pin, JEDEC MO-178 compliant. Pin 1 = Anode (input), Pin 2 = Cathode (output/reference), Pin 3 = NC (no connection, floating per datasheet).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Current sink input | Connected to regulated supply rail; sets operating current via series resistor |
| Pin 2 (Cathode) | Reference output | Provides stable 4.096 V node; directly interfaces to ADC REF+ or op-amp feedback |
| Pin 3 (NC) | No connection | Floating per datasheet; must not be tied to ground or supply to avoid parametric shift |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Enables direct integration into compact sensor nodes without stability-compromising layout constraints |
| Low knee current (18 µA) | Supports battery life extension in always-on IoT endpoints with sub-10 µA sleep current budgets |
| Stable with capacitive loads | Eliminates need for isolation resistors when driving ADC sample-and-hold inputs up to 10 µF |
| Fast transient response (<10 µs) | Reduces reference settling delay in multiplexed multi-channel DAQ systems |
| Rugged 200 mA surge rating | Withstands ESD-induced transients and hot-swap events without latch-up or parameter shift |
Applications
| Portable Multimeter Front-End | Battery-Powered Data Logger |
|---|---|
Use Scenario: High-impedance DC voltage measurement with auto-ranging and 12-bit resolution. IC Role / Device Role / Timing Role: Shunt voltage reference for dual-slope integrator and ADC reference input. Use Value: ±2% tolerance and 30 ppm/°C TC ensure calibrated accuracy across handheld operating temperatures without recalibration. | Use Scenario: Long-term environmental monitoring using coin-cell power and intermittent sampling. IC Role / Device Role / Timing Role: Precision bias source for low-power op-amps and SAR ADC reference. Use Value: 18 µA knee current enables reliable startup from 2.7 V coin cells; no capacitor reduces BOM count and PCB area. |
| Industrial Panel Meter | Medical Sensor Signal Conditioning |
Use Scenario: 4–20 mA loop-powered display with local analog sensing. IC Role / Device Role / Timing Role: Stable excitation reference for RTD bridge and ADC reference. Use Value: 0.4 Ω slope resistance minimizes gain error when sourcing bridge current under varying load conditions. | Use Scenario: Low-noise biopotential amplifier with 16-bit ADC digitization. IC Role / Device Role / Timing Role: Low-noise reference for instrumentation amplifier common-mode setting and ADC REF+. Use Value: 90 µVrms wideband noise avoids degrading SNR in sub-µV-level ECG/EEG front-ends. |
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), 0.5% tolerance, 90 ppm/°C TC, 350 mV dropout headroom required | Requires external resistor divider; unsuitable for fixed 4.096 V use without trimming | Select only if adjustable reference and higher initial accuracy are needed; adds component count and layout complexity |
| REF3040AIDBZR | Series topology, 4.096 V fixed, 0.2% tolerance, 50 ppm/°C TC, requires 1 µF output capacitor | Higher quiescent current (45 µA), needs external cap, incompatible with capacitor-free layouts | Choose when tighter initial tolerance outweighs board space and capacitor dependency |
Compared with TLVH431AIDBZR and REF3040AIDBZR, the ZRC400A02STOB uniquely combines fixed 4.096 V output, capacitor-free operation, ultra-low knee current, and SOT23-3 footprint-making it optimal for cost-sensitive, space-constrained, battery-operated measurement systems where simplicity and reliability are prioritized over sub-1% tolerance.
Availability
ZRC400A02STOB is available at Aetrix Electronics and suitable for portable multimeters, battery-powered data loggers, and industrial panel meters requiring stable component supply with consistent parametric performance across production batches.
Supply support for ZRC400A02STOB 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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with emphasis on high-reliability, energy-efficient solutions for industrial and consumer markets.
The ZRC400 series belongs to Diodes' precision voltage reference product line, engineered specifically for low-power, high-stability analog measurement and data conversion applications where size, startup time, and load immunity are critical.
FAQ
What is the minimum operating current for stable regulation?
The ZRC400A02STOB achieves stable regulation at 18 µA typical knee current, but datasheet specifies 23 µA as the guaranteed minimum operating current across –40°C to +85°C. Below 23 µA, output voltage may deviate beyond ±2% tolerance, especially at temperature extremes.
Can it drive a 10 µF capacitive load without oscillation?
Yes-the ZRC400A02STOB is explicitly characterized as stable with capacitive loads up to 10 µF without external compensation. This is enabled by its inherent low slope resistance (0.4 Ω) and internal bandwidth control, eliminating need for series isolation resistors in ADC decoupling paths.
Is Pin 3 internally connected or truly unused?
Pin 3 is unconnected (NC) and must remain floating per the official datasheet. Internal die mapping confirms no bond wire or circuit tie to Pin 3; connecting it to ground or supply risks altering thermal dissipation paths and may cause unexpected TC shift or long-term drift.
How does its transient response compare to series references like REF3040?
ZRC400A02STOB settles in <10 µs due to shunt topology and low output impedance, while REF3040AIDBZR requires >50 µs due to internal pass transistor gate charging and mandatory output capacitor. This makes ZRC400A02STOB preferable in fast-multiplexed sampling systems where reference settling dominates channel switching time.
ZRC400A02STOB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±2%
- Temperature Coefficient:
- 90ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 90µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 23 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92
ZRC400A02STOB FAQ
1.How can I place an order for ZRC400A02STOB through Aetrix?
Please submit a Request for Quotation (RFQ) for ZRC400A02STOB 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 ZRC400A02STOB reliable?
The price and inventory of ZRC400A02STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRC400A02STOB is usually 5 days.
3.What payment methods are accepted for ZRC400A02STOB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRC400A02STOB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZRC400A02STOB?
ZRC400A02STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZRC400A02STOB 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 ZRC400A02STOB?
For technical support, including ZRC400A02STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRC400A02STOB requirements.
6.How does Aetrix verify that ZRC400A02STOB is sourced from the original manufacturer or authorized distributors?
All ZRC400A02STOB 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 ZRC400A02STOB meets industry standards.
7.What is the process for return or replacement of ZRC400A02STOB?
All ZRC400A02STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZRC400A02STOB, 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 ZRC400A02STOB part is unused and in its original packaging.
Return procedure for ZRC400A02STOB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZRC400A02STOB Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
