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Diodes Incorporated ZRC500A02STOA
- Part No.:
- ZRC500A02STOA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
ZRC500A02STOA.pdf
- Description:
- IC VREF SHUNT 2% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:4,422
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Product details
Overview
ZRC500A02STOA from Diodes Incorporated is a precision 5.0 V bandgap voltage reference IC with ±2% initial tolerance, 30 ppm/°C typical temperature coefficient, and 0.4 Ω typical slope resistance. It operates from 25 µA to 5 mA, requires no external capacitor, and achieves stable output in <10 µs-ideal for low-power portable instrumentation and battery-powered metering systems.
For engineers reviewing the ZRC500A02STOA datasheet, ZRC500A02STOA pinout, ZRC500A02STOA application, or ZRC500A02STOA equivalent, key selection factors include knee current (19 µA typ), capacitive load stability, transient response time (<10 µs), industrial temperature range (–40°C to +85°C), and SOT23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The ZRC500A02STOA implements a two-terminal shunt reference topology using a bandgap-derived core, delivering regulated 5.0 V reverse breakdown across its anode-cathode terminals. Its internal design eliminates need for external stabilization capacitance while maintaining stability into capacitive loads up to 10 nF.
It features low dynamic impedance (0.3 Ω typ at 1 mA, 100 Hz), wideband noise of 105 µV(rms) (10 Hz–10 kHz), and robust transient immunity-withstanding surge currents up to 200 mA and surviving absolute maximum reverse current of 25 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±2% at 150 µA, enabling accurate ADC/DAC biasing in 5 V systems |
| Temp. Coefficient | 30 ppm/°C typical, ensuring ≤±1.5 mV drift over –40°C to +85°C |
| Knee Current | 19 µA typical, allowing reliable start-up in ultra-low-power sleep modes |
| Slope Resistance | 0.4 Ω typical, minimizing output voltage shift under load current variation |
| Transient Response | Stable in <10 µs, supporting fast-switching power monitoring and sampling circuits |
| Noise (10 Hz–10 kHz) | 105 µV(rms), suitable for high-resolution measurement front-ends |
| Operating Current Range | 25 µA to 5 mA, matching energy budgets of coin-cell and Li-ion portable designs |
Pinout & Package
Package: SOT23-3 (suffix "F"), surface-mount, 3-pin, lead-free, RoHS-compliant. Pin 1 = Anode (floating or tied to Pin 2 per layout), Pin 2 = Cathode (output/reference node), Pin 3 = NC (no connection, internally floating).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Reference input terminal | Connected to system ground or current-sink node; may be tied to Pin 2 for specific bias configurations |
| Pin 2 (Cathode) | Regulated 5.0 V output node | Provides stable reference voltage; sinks current from external circuitry |
| Pin 3 (NC) | No internal connection | Must remain unconnected or grounded per layout guidelines; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Enables direct integration into compact sensor nodes without added BOM cost or board area |
| Low knee current (19 µA typ) | Supports operation in microcontroller deep-sleep states where supply current is sub-50 µA |
| Capacitive load stability | Remains stable with up to 10 nF load capacitance-eliminates need for isolation resistors |
| Rugged 20 V process technology | Withstands ESD events and line transients common in industrial field instruments |
| Industrial temperature range | Validated performance from –40°C to +85°C without derating-suitable for outdoor metering |
Applications
| Battery-Powered Multimeters | Portable Gas Detectors |
|---|---|
Use Scenario: Handheld multimeter requiring stable 5.0 V reference for 16-bit ADC conversion across varying battery voltage (2.8–4.2 V). IC Role / Device Role / Timing Role: Two-terminal shunt reference providing precision bias for analog front-end and reference ladder. Use Value: 30 ppm/°C TC and <10 µs settling ensure measurement repeatability during rapid on/off cycling and ambient temperature shifts. | Use Scenario: Low-power gas sensor module powered by CR2450 coin cell, operating intermittently for 5+ years. IC Role / Device Role / Timing Role: Primary voltage reference for electrochemical sensor signal conditioning and microcontroller ADC calibration. Use Value: 19 µA knee current enables reliable wake-up from 0.5 µA sleep mode; no capacitor reduces component count and leakage paths. |
| Smart Electricity Meters | Industrial Panel Meters |
Use Scenario: DIN-rail mounted electricity meter with isolated power rails and metrology-grade accuracy requirements. IC Role / Device Role / Timing Role: Secondary reference source for isolated ADC section, decoupled from main supply rail noise. Use Value: 0.4 Ω slope resistance minimizes error contribution under varying load conditions caused by RF communication bursts. | Use Scenario: Factory-floor panel meter exposed to vibration, thermal cycling, and 24 V DC supply ripple. IC Role / Device Role / Timing Role: Stable 5.0 V reference for analog-to-digital conversion of 4–20 mA loop signals. Use Value: Rugged 20 V process withstands 40 V transients on shared 24 V bus; –40°C to +85°C rating ensures reliability in unconditioned enclosures. |
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% initial tolerance, 90 ppm/°C TC, requires external resistor divider | Used where programmable reference voltage or tighter initial tolerance is needed | Select when system requires >2.5 V adjustable output and can accommodate 2-resistor feedback network |
| LM4040C50IDBZR | Fixed 5.0 V, ±0.5% tolerance, 100 ppm/°C TC, 75 µA min cathode current | Higher precision but higher minimum operating current limits ultra-low-power use | Prefer for metrology-grade accuracy where 75 µA minimum current is acceptable |
Compared with TLVH431AIDBZR and LM4040C50IDBZR, the ZRC500A02STOA offers lowest knee current (19 µA) and best balance of stability, size, and simplicity for fixed 5 V references in battery-constrained designs-without external components or adjustment overhead.
Availability
ZRC500A02STOA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and smart metering systems requiring stable component supply with long-term manufacturability.
Supply support for ZRC500A02STOA 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 ZRC500 series belongs to Diodes' precision voltage reference product line, engineered specifically for space- and power-constrained applications demanding stable, capacitor-free 5 V references with fast transient response and extended temperature operation.
FAQ
Is ZRC500A02STOA a three-terminal or two-terminal device?
ZRC500A02STOA is a two-terminal shunt voltage reference: Pin 1 (anode) and Pin 2 (cathode) form the functional terminals; Pin 3 is NC (no internal connection). It operates by sinking current through the cathode to maintain 5.0 V across the terminals-no third control pin or enable function is present.
Can ZRC500A02STOA drive a 10 nF capacitive load without oscillation?
Yes-ZRC500A02STOA is explicitly characterized for stability with capacitive loads up to 10 nF, per its datasheet Figure 4-264 and "capacitive load stability" feature. No series isolation resistor is required, unlike many competing shunt references that demand RC compensation networks.
What is the maximum safe continuous current for ZRC500A02STOA in SOT23-3 package?
In SOT23-3 package at 25°C ambient, the absolute maximum continuous reverse current is 25 mA, with power dissipation limited to 330 mW. Derating is required above 25°C; at 85°C ambient, max continuous current drops to ~12 mA to stay within thermal limits.
Does ZRC500A02STOA require a minimum load current to regulate properly?
Yes-the device requires ≥25 µA minimum operating current (IMIN) to maintain regulation within specification. Its knee current is 19 µA typical, but datasheet guarantees full performance only above 25 µA. Below this, output voltage may deviate beyond ±2% tolerance.
ZRC500A02STOA 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±2%
- Temperature Coefficient:
- 90ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 105µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 25 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92
ZRC500A02STOA FAQ
1.How can I place an order for ZRC500A02STOA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZRC500A02STOA 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 ZRC500A02STOA reliable?
The price and inventory of ZRC500A02STOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRC500A02STOA is usually 5 days.
3.What payment methods are accepted for ZRC500A02STOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRC500A02STOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZRC500A02STOA?
ZRC500A02STOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZRC500A02STOA 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 ZRC500A02STOA?
For technical support, including ZRC500A02STOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRC500A02STOA requirements.
6.How does Aetrix verify that ZRC500A02STOA is sourced from the original manufacturer or authorized distributors?
All ZRC500A02STOA 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 ZRC500A02STOA meets industry standards.
7.What is the process for return or replacement of ZRC500A02STOA?
All ZRC500A02STOA units undergo pre-shipment inspection (PSI). If there is an issue with ZRC500A02STOA, 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 ZRC500A02STOA part is unused and in its original packaging.
Return procedure for ZRC500A02STOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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