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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated ZMR500C

Name: ZMR500C
Brand: Diodes Incorporated
SKU: ZMR500C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZMR500C

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: ZMR500C.pdf

Description:: IC REG LINEAR 5V 50MA TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:2,881

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Product details

Overview

ZMR500C from Diodes Incorporated is a fixed 5.0 V, low-quiescent-current (50–70 µA) linear voltage regulator in TO-92 package, delivering up to 50 mA output current with input voltage range of 7.0 V to 25 V, designed for local low-current power supply in consumer electronics and microcontroller subsystems.

For engineers reviewing the ZMR500C datasheet, ZMR500C pinout, ZMR500C application, or ZMR500C equivalent, key selection criteria include dropout behavior at 50 mA, ±2.5% output voltage accuracy over temperature, 55–72 dB ripple rejection at 120 Hz, and thermal shutdown protection under sustained overload.

Technical Context

The ZMR500C implements a monolithic bandgap-referenced series pass architecture with internal current limiting and thermal shutdown-no external components required for stable operation. Its unconditionally stable design eliminates need for output capacitance compensation across load and temperature ranges.

It operates as a three-terminal positive regulator where IN supplies unregulated DC, OUT delivers regulated 5.0 V, and GND establishes reference. The device maintains regulation down to 6.2 V input (V_IN(min)) and exhibits 0.275–0.700 mV/°C temperature coefficient on output voltage.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	4.785–5.125 V (±2.5% initial accuracy at 25°C, 4.780–5.175 V over −55°C to +125°C)
Input Voltage Range	7.0 V to 25 V (supports wide-input industrial and consumer rails; minimum 6.2 V to sustain regulation)
Max Output Current	50 mA (continuous; limited by internal current foldback and thermal derating in TO-92)
Quiescent Current	50–70 µA (enables battery-backed or always-on low-power nodes without significant standby drain)
Ripple Rejection	55–72 dB at 120 Hz (effectively suppresses rectified AC noise from wall adapters or SMPS post-regulation)
Line Regulation	5–15 mV (ΔV_O over full input range; ensures stable output despite upstream supply variation)
Load Regulation	15–40 mV (ΔV_O from 0 to 50 mA; suitable for lightly loaded logic or sensor biasing)

Pinout & Package

Package: TO-92 (obsolete variant per ordering table; marked "ZMR500C", underside view). Not recommended for new designs; SOT23 (ZMR500FTA) is the active replacement.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	GND	Reference node for regulation; must be low-impedance connection to system ground plane
2 (Collector)	IN	Unregulated input supply; requires ≥6.2 V to maintain 5.0 V output at full load
3 (Base)	OUT	Regulated 5.0 V output; capable of sourcing up to 50 mA into capacitive or resistive loads

Key Features

Feature	Design Value
Thermal Shutdown Protection	Activates at T_J ≈ 125°C; prevents permanent damage during sustained overload or poor heatsinking
Internal Short-Circuit Current Limit	Self-limiting foldback current protects device and source during output fault conditions
Unconditionally Stable Operation	No external capacitor required for stability-even with zero ESR ceramic output caps
Low Temperature Coefficient	0.275–0.700 mV/°C output drift enables precision biasing in wide-temperature environments
Green Compliance	Totally lead-free, halogen- and antimony-free per Diodes Inc. definition (<900 ppm Br/Cl, <1000 ppm Sb)

Applications

Consumer Audio Power Supply

DVD/Blu-ray Player Logic Rail

Use Scenario: Providing clean 5 V bias to op-amps and DACs in portable audio amplifiers.

IC Role / Device Role / Timing Role: Low-noise local regulator for analog signal chain power, decoupling from noisy digital rails.

Use Value: 90 µV_rms output noise (10 Hz–10 kHz) preserves SNR in audio front-ends without additional filtering.

Use Scenario: Powering microcontroller I/O banks and IR receiver circuits in optical disc players.

IC Role / Device Role / Timing Role: Standby-capable voltage source enabling fast wake-up from deep-sleep modes.

Use Value: 50–70 µA quiescent current minimizes battery drain during idle states while maintaining rail readiness.

Security System Sensor Node

Industrial Monitor Local Bias

Use Scenario: Regulating power for PIR motion sensors and wireless transceivers in battery-operated security cameras.

IC Role / Device Role / Timing Role: Primary LDO for ultra-low-power sensing subsystems operating across −40°C to +85°C ambient.

Use Value: Guaranteed 50 mA output at −55°C to +125°C junction temperature supports extended outdoor deployment.

Use Scenario: Generating auxiliary 5 V rail for display controller logic and touch interface ICs in medical-grade monitors.

IC Role / Device Role / Timing Role: Secondary regulator isolated from main SMPS to reduce EMI coupling into sensitive imaging circuitry.

Use Value: 55–72 dB ripple rejection at 120 Hz suppresses line-frequency artifacts that could modulate display timing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV70550DBVR	SOT-23-5, 200 mA output, 25 µA IQ, 170 mV dropout @ 200 mA	Higher current, lower dropout, but requires external EN pin control and bypass cap	Preferred for new designs needing >50 mA or tighter dropout; not pin-compatible with ZMR500C
ZMR500FTA	SOT-23-3, identical electrical specs, 3000/reel tape-and-reel, active status	Same regulation performance, smaller footprint, better thermal resistance (180°C/W vs TO-92's ~220°C/W)	Direct functional replacement; recommended for all new designs due to availability and manufacturability

Compared with TLV70550DBVR and ZMR500FTA, the ZMR500C offers legacy TO-92 compatibility for repair or legacy board reuse-but lacks modern packaging, higher current capability, and active lifecycle support; ZMR500FTA is the only recommended production alternative.

Availability

ZMR500C is available at Aetrix Electronics and suitable for consumer electronics, optical disc players, and security system sensor nodes requiring stable component supply despite its obsolete status-stock is limited to remaining legacy inventory.

Supply support for ZMR500C 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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The ZMR series was developed as a family of miniature, low-I_Q fixed-voltage regulators targeting space-constrained, battery-sensitive applications in consumer and industrial electronics-prioritizing simplicity, reliability, and RoHS compliance over programmability or high current.

FAQ

Is ZMR500C still in active production?

No. Per Diodes Incorporated's ordering information table, all TO-92 variants-including ZMR500C-are obsolete and replaced by SOT-23 packaged ZMR500FTA. Aetrix Electronics holds limited legacy stock for repair and maintenance use only; no new production lots are planned.

What is the maximum allowable power dissipation for ZMR500C at 85°C ambient?

At T_AMB = 85°C, the TO-92 package's thermal derating reduces maximum power dissipation to approximately 220 mW (from 500 mW at 25°C), limiting usable output current to ~35 mA at 5 V output with 18 V input-calculated using P_D = (V_IN − V_OUT) × I_OUT.

Can ZMR500C operate with 6.0 V input?

No. The datasheet specifies a minimum input voltage of 6.2 V to maintain regulation at full load. At 6.0 V input, the device enters dropout-output voltage drops below 5.0 V and regulation is lost, especially above 10 mA load current.

Does ZMR500C require an input or output capacitor for stability?

No. The ZMR500C is unconditionally stable and does not require external capacitors for basic operation. However, a 1 µF ceramic capacitor on the output is recommended to improve transient response and reduce high-frequency noise, per typical application guidance in DS32195.

ZMR500C Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Packaging:: Bulk

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 25V

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

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 50mA

Current - Quiescent (Iq):: 70 µA

Current - Supply (Max):: -

PSRR:: 72dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92

ZMR500C FAQ

1.How can I place an order for ZMR500C through Aetrix?

Please submit a Request for Quotation (RFQ) for ZMR500C 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 ZMR500C reliable?

The price and inventory of ZMR500C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMR500C is usually 5 days.

3.What payment methods are accepted for ZMR500C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMR500C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZMR500C?

ZMR500C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZMR500C 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 ZMR500C?

For technical support, including ZMR500C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMR500C requirements.

6.How does Aetrix verify that ZMR500C is sourced from the original manufacturer or authorized distributors?

All ZMR500C 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 ZMR500C meets industry standards.

7.What is the process for return or replacement of ZMR500C?

All ZMR500C units undergo pre-shipment inspection (PSI). If there is an issue with ZMR500C, 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 ZMR500C part is unused and in its original packaging.

Return procedure for ZMR500C:

1.Submit a request within 90 days.

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

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