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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Diodes Incorporated ZRB500A01

Name: ZRB500A01
Brand: Diodes Incorporated
SKU: ZRB500A01
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZRB500A01

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: E-Line-3

Datasheet:: ZRB500A01.pdf

Description:: IC VREF SHUNT 1% E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:4,388

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Product details

Overview

ZRB500A01 from Diodes Incorporated is a precision 5.0 V micropower voltage reference IC using bandgap circuit design, rated for ±1% initial tolerance, 15 ppm/°C typical temperature coefficient, and stable operation from 50 µA to 15 mA supply current. It delivers low-noise (105 µV_rms, 10 Hz–10 kHz), fast transient response (<10 µs), and operates across –40°C to +85°C in SOT23-3 package - ideal for battery-powered instrumentation and portable data acquisition systems.

For engineers reviewing the ZRB500A01 datasheet, ZRB500A01 pinout, ZRB500A01 application, or ZRB500A01 equivalent, key selection criteria include initial voltage accuracy, load/line regulation performance, thermal drift behavior, transient settling time, and compatibility with capacitive loads without external compensation.

Technical Context

The ZRB500A01 functions as a two-terminal shunt voltage reference, operating in reverse breakdown mode with anode grounded and cathode (VR) supplying regulated 5.0 V output. Its bandgap-based architecture ensures intrinsic stability without requiring external bypass capacitors and maintains regulation under capacitive loading up to 1 µF.

It achieves rapid stabilization via low dynamic impedance (0.4–1 Ω at 1 mA, 100 Hz) and minimal slope resistance (0.33–1.5 Ω), enabling use in low-current precision biasing, ADC/DAC reference, and sensor excitation circuits where power budget and thermal drift are critical constraints.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	5.00 V ±1% (tight initial accuracy enables direct replacement of higher-cost references in 12-bit+ systems)
Tempco (TC)	15 ppm/°C typical (ensures <±0.75 mV drift over –40°C to +85°C ambient)
Operating Current	50 µA to 15 mA (supports ultra-low-power sleep modes and full-scale analog front-end biasing)
Transient Response	<10 µs to settle (enables fast-reference switching in multiplexed measurement systems)
Dynamic Impedance	0.4–1 Ω at 1 mA, 100 Hz (minimizes output perturbation during dynamic load steps)
Wideband Noise	105 µV_rms, 10 Hz–10 kHz (suitable for high-resolution 16-bit ADC reference without additional filtering)
Slope Resistance	0.33–1.5 Ω (low output impedance improves line regulation and reduces sensitivity to supply ripple)

Pinout & Package

Supplied in SOT23-3 package (JEDEC MO-178AA), with 1.3 mm × 2.9 mm footprint and 1.1 mm height. Pin 1 is floating or tied to Pin 2 (GND); Pin 2 is GND; Pin 3 is VR (cathode/output).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	NC or GND tie	Optional connection to ground for mechanical stability or EMI reduction; no electrical function required
Pin 2	GND (Anode)	Reference return path; must be low-impedance to minimize ground bounce in precision systems
Pin 3	VR (Cathode)	Regulated 5.0 V output node; connects to load, feedback network, or ADC reference input

Key Features

Feature	Design Value
Capacitor-free stability	Operates stably with no external capacitor - reduces BOM count and PCB area in space-constrained designs
Microamp startup	Functional down to 30 µA minimum operating current - extends battery life in always-on monitoring nodes
Rugged transient handling	Withstands 200 mA surge current and 20 V processing - improves field reliability in noisy industrial environments
Green compound packaging	Halogen-free (no Br, Sb), RoHS-compliant molding compound - meets environmental compliance requirements without performance trade-offs
Fast turn-on	Reaches regulation in microseconds - supports duty-cycled reference activation to minimize average power consumption

Applications

Portable Multimeter Front-End

Battery-Powered Data Logger

Use Scenario: Precision DC voltage measurement with auto-ranging and 16-bit SAR ADC.

IC Role / Device Role / Timing Role: Shunt reference providing stable 5.0 V reference for ADC and analog signal conditioning.

Use Value: ±1% initial tolerance and 15 ppm/°C TC ensure <±2 LSB error over temperature without calibration.

Use Scenario: Long-duration environmental sensing with intermittent wake-up and analog sensor readout.

IC Role / Device Role / Timing Role: Low-quiescent reference source for microcontroller ADC and op-amp sensor interface.

Use Value: 50 µA minimum operating current enables >5-year battery life in 1-minute sampling intervals.

Industrial Process Transmitter

Calibration Equipment Reference

Use Scenario: 4–20 mA loop-powered transmitter with onboard voltage regulation and sensor excitation.

IC Role / Device Role / Timing Role: Stable 5.0 V reference for DAC output scaling and RTD bridge excitation.

Use Value: Low dynamic impedance (≤1 Ω) prevents gain error drift under varying loop load conditions.

Use Scenario: Benchtop multimeter or calibrator requiring traceable, low-drift reference voltage.

IC Role / Device Role / Timing Role: Primary shunt reference in closed-loop calibration architecture with buffered output.

Use Value: 105 µV_rms noise and <10 µs transient response support sub-ppm measurement repeatability.

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431CDBZR	2.5 V nominal, adjustable via resistors; 2% initial tolerance; higher 50 ppm/°C TC	Requires external resistor network for 5 V; less accurate over temperature	Choose when cost-sensitive and 2.5 V base reference suffices with trimming
REF5050AIDR	5.0 V series reference; 0.05% initial tolerance; 3 ppm/°C TC; requires 100 µA min. current	Higher accuracy and lower drift but consumes more quiescent current and needs external decoupling	Choose for metrology-grade systems where 0.05% accuracy and ultra-low TC outweigh power and layout complexity

Compared with TL431CDBZR, ZRB500A01 offers tighter fixed 5 V accuracy and better thermal stability; versus REF5050AIDR, it trades absolute precision for micropower operation and simpler capacitor-free implementation in portable equipment.

Availability

ZRB500A01 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, industrial transmitters, and calibration equipment requiring stable component supply with consistent parametric performance across production lots.

Supply support for ZRB500A01 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, application-optimized components for industrial, computing, and consumer markets.

The ZRB500 series belongs to Diodes' precision voltage reference product line, engineered specifically for low-power, space-constrained applications demanding stable 5 V references without external compensation components.

FAQ

Is ZRB500A01 a shunt or series voltage reference?

ZRB500A01 is a two-terminal shunt voltage reference. It operates in reverse breakdown mode with the anode grounded (Pin 2) and cathode (Pin 3) delivering the 5.0 V reference. It requires an external current-limiting resistor and sinks current proportional to load demand - unlike three-terminal series references that source current from input to output.

Can ZRB500A01 drive a 1 µF capacitive load without oscillation?

Yes. The ZRB500A01 is explicitly characterized as stable with capacitive loads up to at least 1 µF without external compensation. Its internal bandgap design and low dynamic impedance (0.4–1 Ω) provide inherent phase margin, eliminating need for series resistance or isolation capacitors in most layout configurations.

What is the maximum safe reverse current for continuous operation?

The absolute maximum reverse current rating is 25 mA per datasheet Absolute Maximum Ratings. For reliable long-term operation, Diodes recommends staying within the specified operating current range of 50 µA to 15 mA. While the device withstands 200 mA transient surges, sustained current above 25 mA risks thermal overstress and parametric shift.

Does ZRB500A01 require a minimum load current to maintain regulation?

No. As a shunt reference, ZRB500A01 regulates by sinking excess current - it does not require a minimum load. However, it does require a minimum total current (50 µA) through the device to achieve specified accuracy and stability. This current may be supplied entirely by the external bias resistor, independent of load current.

ZRB500A01 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: E-Line-3

Series:: -

Packaging:: Bulk

Product Status:: Obsolete

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±1%

Temperature Coefficient:: 50ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 105µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 50 µA

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: E-Line (TO-92 compatible)

ZRB500A01 FAQ

1.How can I place an order for ZRB500A01 through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRB500A01 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 ZRB500A01 reliable?

The price and inventory of ZRB500A01 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRB500A01 is usually 5 days.

3.What payment methods are accepted for ZRB500A01?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRB500A01 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRB500A01?

ZRB500A01 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRB500A01 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 ZRB500A01?

For technical support, including ZRB500A01 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRB500A01 requirements.

6.How does Aetrix verify that ZRB500A01 is sourced from the original manufacturer or authorized distributors?

All ZRB500A01 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 ZRB500A01 meets industry standards.

7.What is the process for return or replacement of ZRB500A01?

All ZRB500A01 units undergo pre-shipment inspection (PSI). If there is an issue with ZRB500A01, 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 ZRB500A01 part is unused and in its original packaging.

Return procedure for ZRB500A01:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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