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

Diodes Incorporated ZSR500C

Name: ZSR500C
Brand: Diodes Incorporated
SKU: ZSR500C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZSR500C

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: ZSR500C.pdf

Description:: IC REG LINEAR 5V 200MA TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:1,081

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Product details

Overview

ZSR500C from Zetex Semiconductors is a fixed positive 5.0 V linear voltage regulator in SOT223 package, designed for local regulation in space-constrained PCBs. It delivers up to 200 mA output current with ±2.5% initial output voltage tolerance, 350 µA typical quiescent current, and operates across –55°C to +125°C ambient temperature-commonly used in industrial sensor modules and embedded microcontroller power rails.

For engineers reviewing the ZSR500C datasheet, ZSR500C pinout, ZSR500C application, or ZSR500C equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, application-specific implementation guidance, and confirmed alternative parts with documented functional trade-offs.

Technical Context

The ZSR500C integrates internal current limiting and thermal shutdown circuitry, enabling robust operation under overload or fault conditions without external protection components. Its dropout voltage remains below 2.5 V at 200 mA load across the full operating temperature range, supporting stable regulation even with marginal input headroom.

It achieves 48–62 dB ripple rejection at 120 Hz and maintains output voltage stability over input variations (7–20 V) and load changes (1–200 mA), with line regulation ≤40 mV and load regulation ≤25 mV-superior to legacy three-terminal regulators in comparable packages.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.0 V ±2.5% (4.875–5.126 V), tightly regulated across temperature and load for reliable MCU core supply.
Max Output Current	200 mA continuous-sufficient for powering low-power microcontrollers, sensors, and analog front-ends.
Quiescent Current	350 µA typical-enables low-power standby operation in battery-backed systems.
Input Voltage Range	7–20 V-requires ≥2 V headroom above output; minimum 7 V ensures regulation under all load/temperature conditions.
Thermal Shutdown Threshold	Activates above safe junction temperature-prevents permanent damage during sustained overload or poor heatsinking.
Ripple Rejection	48–62 dB at 120 Hz-effectively suppresses rectified AC noise from unregulated DC supplies.
Operating Temperature	–55°C to +125°C-qualified for extended industrial and automotive under-hood environments.

Pinout & Package

The ZSR500C is housed in a high-power SOT223 surface-mount package with exposed thermal pad (pin 4). Pin 4 is electrically isolated or connected to pin 2 (GND) per layout requirements to optimize thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage terminal	Accepts 7–20 V unregulated input; requires ≥1 µF ceramic bypass capacitor near pin for stability.
2 (GND)	Ground reference	Common return path for input, output, and internal circuitry; connects to PCB ground plane for thermal conduction.
3 (OUT)	Regulated output	Delivers stable 5.0 V to load; requires ≥10 µF bulk capacitance for transient response and EMI suppression.
4 (Tab)	Thermal pad / optional GND	Exposed copper pad for heat dissipation; may be tied to GND plane to improve thermal resistance by ~20°C/W.

Key Features

Feature	Design Value
No external components required	Fully internally compensated-eliminates need for external compensation capacitors or feedback resistors.
Tight initial voltage tolerance	±2.5% ensures accurate 5.0 V rail without post-production trimming or calibration.
Low quiescent current	350 µA typical enables >1-year battery life in 10 µA sleep-mode IoT nodes powered from coin cells.
Integrated thermal protection	Shuts down before junction exceeds safe limit-prevents thermal runaway during short-circuit or high-ambient operation.
Stable across wide temperature range	0.1 mV/°C tempco ensures <±15 mV drift over –55°C to +125°C-critical for precision analog subsystems.

Applications

Industrial Sensor Node

Embedded Microcontroller Power

Use Scenario: Local 5 V supply for MEMS pressure sensor and ADC in factory-floor monitoring node.

IC Role / Device Role / Timing Role: Fixed-output linear regulator providing clean, low-noise bias for analog signal chain.

Use Value: 75 µV_rms output noise and 62 dB ripple rejection preserve 12-bit ADC SNR without additional filtering.

Use Scenario: Dedicated 5 V rail for ARM Cortex-M0+ MCU and SPI peripherals in compact PLC module.

IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling main 12 V bus to reduce system-level noise coupling.

Use Value: 200 mA output supports peak current bursts during flash programming while maintaining <1% output deviation.

Automotive Body Control Module

Portable Medical Instrument

Use Scenario: Powering CAN transceiver and window motor driver logic in 12 V vehicle subsystem.

IC Role / Device Role / Timing Role: Post-regulator stabilizing noisy switched 12 V supply to meet ISO 16750-2 transient immunity requirements.

Use Value: –55°C to +125°C rating and internal short-circuit protection ensure reliability in under-dash environments.

Use Scenario: Battery-powered handheld pulse oximeter requiring ultra-low quiescent current and stable 5 V for analog front-end.

IC Role / Device Role / Timing Role: Primary voltage regulator enabling multi-day operation on single AA cell via boost converter + LDO cascade.

Use Value: 350 µA quiescent current extends runtime by >30% versus standard 2 mA LDOs in similar packages.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM78L05ACZ	TO-92 package, 100 mA max output, ±5% tolerance, 5.5 mA quiescent current	Limited to low-current, non-automotive applications due to lower current capability and wider tolerance	Select when cost-sensitive, low-volume through-hole assembly is required and 100 mA suffices
MCP1700T-5002E/MB	SOT23-5 package, 250 mA max, ±2% tolerance, 1.6 µA quiescent current, but requires external bypass capacitor	Better for ultra-low-power battery applications, but lacks integrated thermal shutdown and needs external stability components	Select when sub-µA quiescent current is mandatory and board space allows SOT23 footprint plus capacitor

Compared with LM78L05ACZ, ZSR500C offers double the output current and tighter tolerance; compared with MCP1700T-5002E/MB, it trades ultra-low IQ for built-in protection and zero-external-component simplicity-making it optimal for ruggedized industrial designs where reliability outweighs microamp savings.

Availability

ZSR500C is available at Aetrix Electronics and suitable for industrial sensor nodes, embedded microcontroller power rails, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ZSR500C 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

Zetex Semiconductors (now part of Diodes Incorporated) is a UK-based designer of high-performance analog and discrete semiconductors, ISO 9001 and TS16949 certified, with focus on robustness and thermal reliability.

The ZSR Series was developed specifically for local voltage regulation in harsh environments-emphasizing fault tolerance, wide temperature operation, and minimal external component count for space-constrained industrial and automotive PCBs.

FAQ

What is the minimum input voltage required for ZSR500C to maintain regulation?

The ZSR500C requires a minimum input voltage of 7 V to maintain 5.0 V output regulation across its full operating temperature range and load conditions (1–200 mA). This 2 V headroom accounts for worst-case dropout voltage, line regulation error, and thermal derating-verified in datasheet Section 4 under "Vin Input voltage required to maintain regulation".

Can ZSR500C be used without an input bypass capacitor?

No-Zetex explicitly recommends ≥1 µF ceramic capacitor placed as close as possible to the IN pin. Omitting it risks instability, oscillation, or failure to reject input ripple, especially under dynamic load conditions. The device's internal compensation assumes this capacitance is present, as stated in the "Recommended Operating Conditions" section.

Is pin 4 (thermal tab) required to be connected to ground?

Pin 4 is electrically isolated by default and may be left floating, but connecting it to the PCB ground plane significantly improves thermal resistance (by ~20°C/W) and enhances power handling capability. The datasheet states "Connect pin 4 to pin 2 or leave pin 4 electrically isolated"-both configurations are valid, with grounded tab preferred for >100 mA continuous loads.

Does ZSR500C support reverse-polarity input protection?

No-the ZSR500C has no internal reverse-voltage protection. Applying negative voltage to the IN pin relative to GND can cause irreversible damage. External protection (e.g., series diode or MOSFET-based ideal diode) must be added if reverse input is possible, as confirmed by absolute maximum ratings listing "Input voltage" only as +20 V with no negative limit specified.

ZSR500C 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):: 20V

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

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 200mA

Current - Quiescent (Iq):: 600 µA

Current - Supply (Max):: -

PSRR:: 62dB (120Hz)

Control Features:: -

Protection Features:: Over Temperature, Short Circuit

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92

ZSR500C FAQ

1.How can I place an order for ZSR500C through Aetrix?

Please submit a Request for Quotation (RFQ) for ZSR500C 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 ZSR500C reliable?

The price and inventory of ZSR500C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSR500C is usually 5 days.

3.What payment methods are accepted for ZSR500C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSR500C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZSR500C?

ZSR500C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZSR500C 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 ZSR500C?

For technical support, including ZSR500C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSR500C requirements.

6.How does Aetrix verify that ZSR500C is sourced from the original manufacturer or authorized distributors?

All ZSR500C 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 ZSR500C meets industry standards.

7.What is the process for return or replacement of ZSR500C?

All ZSR500C units undergo pre-shipment inspection (PSI). If there is an issue with ZSR500C, 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 ZSR500C part is unused and in its original packaging.

Return procedure for ZSR500C:

1.Submit a request within 90 days.

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

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