Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Diodes Incorporated ZSR520GTC

Name: ZSR520GTC
Brand: Diodes Incorporated
SKU: ZSR520GTC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: ZSR520GTC

Manufacturer:: Diodes Incorporated

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

Package:: TO-261-4, TO-261AA

Datasheet:: ZSR520GTC.pdf

Description:: IC REG LINEAR 5.2V 200MA SOT223

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,289

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

ZSR520GTC from Zetex Semiconductors is a fixed positive 5.2 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 (5.070–5.330 V), 350–600 µA quiescent current, and operates across –55°C to +125°C. It is used in embedded microcontroller power rails where low-noise, stable local supply and thermal robustness are required.

For engineers reviewing the ZSR520GTC datasheet, ZSR520GTC pinout, ZSR520GTC application, or ZSR520GTC equivalent, this page provides verified electrical parameters, thermal derating guidance, ripple rejection (48–62 dB at 120 Hz), dropout behavior, and real-world use cases in industrial control and sensor signal conditioning circuits.

Technical Context

The ZSR520GTC integrates internal short-circuit current limiting and thermal shutdown circuitry, enabling fault resilience without external protection components. Its architecture requires no external capacitors for stability-operation remains fully stable from 1 mA to 200 mA load across input voltages of 7.2 V to 20 V.

It exhibits a typical dropout voltage of ~1.0 V at 100 mA (rising to ~1.3 V at 200 mA), with output voltage temperature coefficient of 0.1 mV/°C (IO = 5.0 mA). Ripple rejection is specified at 48–62 dB (f = 120 Hz), and output noise is 75 µV_rms (10 Hz–10 Hz bandwidth).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.2 V nominal; min/max 5.070–5.330 V at 1–200 mA ensures reliable logic-level compliance for 5 V systems.
Output Current	200 mA max; sufficient for powering MCU cores, analog sensors, or small logic blocks without external pass devices.
Quiescent Current	350–600 µA; enables low-power standby operation in battery-backed or energy-sensitive applications.
Input Voltage Range	7.2 V to 20 V; supports wide-input industrial supplies while maintaining regulation above dropout threshold.
Ripple Rejection	48–62 dB at 120 Hz; suppresses AC line-derived noise on unregulated DC rails feeding sensitive analog circuitry.
Operating Temperature	–55°C to +125°C; validated for under-hood automotive modules, industrial PLC I/O, and outdoor telecom equipment.
Thermal Shutdown	Active at junction temperature > design limit; prevents catastrophic failure during sustained overload or poor heatsinking.

Pinout & Package

SOT223 package (suffix G) with exposed thermal pad on underside; pin 4 is internally connected to pin 2 (GND) and may be electrically isolated or tied to ground for enhanced thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (IN)	Input voltage terminal	Accepts 7.2–20 V unregulated DC; must be decoupled with ≥1 µF capacitor to prevent shutdown-induced transients.
Pin 2 (GND)	Ground reference	Common return for input, output, and internal bias; connects to PCB ground plane for thermal and noise control.
Pin 3 (OUT)	Regulated output	Delivers stable 5.2 V to load; output capacitance not required but recommended for transient response improvement.
Pin 4 (GND)	Thermal pad / secondary GND	Internally bonded to pin 2; soldering to large copper area improves thermal resistance by ~20°C/W.

Key Features

Feature	Design Value
No external components required	Fully stable with zero external capacitors-reduces BOM count and layout area in compact designs.
Tight initial tolerance	±2.5% output voltage accuracy eliminates need for post-production trimming in cost-sensitive applications.
Internal thermal shutdown	Self-protecting under sustained overload or ambient temperature rise; recovers automatically after cooldown.
Low quiescent current	350 µA typical enables >1-year battery life in always-on sensor nodes drawing <10 µA average system current.
High-temperature operation	Rated to +125°C junction temperature-supports placement near heat-generating components without derating.

Applications

Industrial Sensor Interface

Microcontroller Local Supply

Use Scenario: Powering analog front-end circuitry for 4–20 mA loop-powered pressure transmitters operating in factory-floor environments.

IC Role / Device Role / Timing Role: Local 5.2 V regulator supplying precision op-amps, ADC references, and signal-conditioning ICs independent of noisy main rail.

Use Value: Maintains 5.2 V ±2.5% over –40°C to +85°C ambient, ensuring consistent sensor offset/gain calibration without recalibration cycles.

Use Scenario: Providing clean, low-noise 5.2 V supply to ARM Cortex-M0+ MCU core and internal peripherals in programmable logic controllers.

IC Role / Device Role / Timing Role: Dedicated local regulator isolating MCU power domain from switching converter noise and shared digital bus transients.

Use Value: 75 µV_rms output noise and 62 dB ripple rejection prevent clock jitter and ADC quantization errors in real-time control loops.

Portable Diagnostic Equipment

Automotive Body Control Module

Use Scenario: Regulating power for handheld medical diagnostic tools with lithium-ion battery input (8–12.6 V) and mixed-signal SoCs.

IC Role / Device Role / Timing Role: Step-down linear regulator delivering stable 5.2 V to RF front-end and data acquisition subsystems.

Use Value: 600 µA max quiescent current extends runtime in standby mode; thermal shutdown prevents damage during accidental short-circuit events.

Use Scenario: Supplying 5.2 V to LIN transceivers and EEPROMs in under-dash body control units exposed to engine bay thermal cycling.

IC Role / Device Role / Timing Role: Local regulator replacing centralized 5 V rail to reduce wiring harness complexity and improve EMI immunity.

Use Value: Operates continuously at +105°C ambient with full 200 mA capability; no external compensation needed simplifies AEC-Q100-compliant layout.

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
LM2931Z-5.0	5.0 V output, higher quiescent current (1.5 mA typ), TO-92/SOT89 packages only	Lacks SOT223 thermal performance; unsuitable for >125°C ambient or >150 mA continuous loads	Select if 5.0 V (not 5.2 V) is acceptable and board space allows larger footprint or lower thermal demand
MCP1702T-5002E/MB	5.0 V output, 4 µA quiescent current, but only 250 mA max and no thermal shutdown	Lower IQ benefits battery life, but absence of internal protection requires external fault management	Prefer for ultra-low-power portable devices where thermal faults are mitigated by system-level controls

Compared with LM2931Z-5.0 and MCP1702T-5002E/MB, ZSR520GTC offers tighter output tolerance (±2.5% vs ±3–5%), integrated thermal/short-circuit protection, and superior high-temperature reliability in SOT223-making it optimal for ruggedized industrial and automotive local regulation where safety and long-term stability are critical.

Availability

ZSR520GTC is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller local supply, portable diagnostic equipment, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ZSR520GTC 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 plc was a UK-based ISO 9001 and TS16949-certified designer and manufacturer of high-reliability analog and power semiconductor components before its acquisition by Diodes Incorporated in 2008.

ZSR Series regulators were developed specifically for local voltage regulation in space-constrained, thermally demanding applications-emphasizing fault resilience, wide temperature operation, and minimal external component count.

FAQ

Is ZSR520GTC still in production?

No-ZSR520GTC is marked "Obsolete" in the official Zetex documentation (Issue 9, October 2007). It is no longer manufactured, but Aetrix Electronics maintains legacy inventory with full traceability and supports obsolescence mitigation through cross-reference analysis and drop-in alternatives where technically viable.

What is the minimum input voltage required for regulation at 200 mA?

The minimum input voltage to maintain 5.2 V output at 200 mA is 7.2 V, per datasheet test conditions. At this load, dropout voltage is approximately 2.0 V; actual dropout increases with temperature and current-designers should allow ≥2.5 V headroom for margin across –55°C to +125°C.

Can ZSR520GTC be used without an input capacitor?

While the device is stable without input capacitance, a ≥1 µF ceramic capacitor is strongly advised across IN–GND. During thermal shutdown events-especially when supplied from inductive sources-a large input transient can exceed the 20 V absolute maximum rating; the capacitor clamps such spikes and ensures safe operation.

How does the SOT223 thermal pad affect power dissipation?

With proper PCB copper pour (2-inch² minimum), the SOT223 package achieves ~2 W power dissipation at 25°C ambient. Pin 4 (thermal pad) must be soldered to a solid ground plane: omitting this connection degrades θ_JA by ~15–20°C/W, reducing usable output current by up to 40% at +85°C ambient.

ZSR520GTC Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-261-4, TO-261AA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 20V

Voltage - Output (Min/Fixed):: 5.2V

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:: Surface Mount

Supplier Device Package:: SOT-223-3

ZSR520GTC FAQ

1.How can I place an order for ZSR520GTC through Aetrix?

Please submit a Request for Quotation (RFQ) for ZSR520GTC 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 ZSR520GTC reliable?

The price and inventory of ZSR520GTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSR520GTC is usually 5 days.

3.What payment methods are accepted for ZSR520GTC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSR520GTC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZSR520GTC?

ZSR520GTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZSR520GTC 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 ZSR520GTC?

For technical support, including ZSR520GTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSR520GTC requirements.

6.How does Aetrix verify that ZSR520GTC is sourced from the original manufacturer or authorized distributors?

All ZSR520GTC 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 ZSR520GTC meets industry standards.

7.What is the process for return or replacement of ZSR520GTC?

All ZSR520GTC units undergo pre-shipment inspection (PSI). If there is an issue with ZSR520GTC, 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 ZSR520GTC part is unused and in its original packaging.

Return procedure for ZSR520GTC:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

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…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

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…