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

Diodes Incorporated ZSR485GTA

Name: ZSR485GTA
Brand: Diodes Incorporated
SKU: ZSR485GTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZSR485GTA

Manufacturer:: Diodes Incorporated

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

Package:: -

Datasheet:: ZSR485GTA.pdf

Description:: IC REG LIN 4.85V 200MA SOT223-4

Quantity:: RFQ Add To RFQ list

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Inventory:1,120

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Product details

Overview

ZSR485GTA from Zetex Semiconductors is a fixed positive 4.85 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 tolerance, 350 µA typical quiescent current, and operates across –55°C to +125°C. Used in industrial sensor nodes and embedded microcontroller power rails where low-noise, self-stabilized regulation is required without external compensation.

For engineers reviewing the ZSR485GTA datasheet, ZSR485GTA pinout, ZSR485GTA application, or ZSR485GTA 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 and thermal trade-offs.

Technical Context

The ZSR485GTA 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 full 200 mA load across temperature, supporting regulation from input voltages as low as 6.85 V.

It achieves 50 µV_RMS output noise (10 Hz–10 kHz) and 50–64 dB ripple rejection at 120 Hz, making it suitable for analog-sensitive subsystems. The device is unconditionally stable with no external capacitors required-its internal compensation ensures phase margin >45° across all operating conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	4.85 V ±2.5% (±121 mV), maintained over 1–200 mA load and –55°C to +125°C.
Input Voltage Range	6.85 V to 20 V - minimum input ensures regulation at full load and temperature extremes.
Quiescent Current	350 µA typical - enables ultra-low-power standby modes in battery-backed systems.
Load Regulation	≤25 mV change from 1 mA to 200 mA - minimizes voltage sag during dynamic MCU core switching.
Line Regulation	≤40 mV change over full input range - maintains stable rail despite supply ripple or source impedance.
Thermal Shutdown Threshold	~150°C junction - protects against sustained overload while allowing short-term peak current delivery.
Output Noise	50 µV_RMS (10 Hz–10 kHz) - supports clean analog front-ends without additional LDO post-regulation.

Pinout & Package

Supplied in high-power SOT223 surface-mount package with exposed thermal pad (pin 4). Pin 4 is internally connected to the die substrate and must be electrically tied to pin 2 (GND) or left floating per layout requirements.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage terminal	Accepts 6.85–20 V DC; requires ≥1 µF ceramic bypass capacitor placed within 5 mm for stability.
2 (GND)	Ground reference	Primary return path for load current and internal bias; connects to PCB ground plane for thermal conduction.
3 (OUT)	Regulated output	Delivers 4.85 V at up to 200 mA; output capacitance not required but recommended for transient response.
4 (Tab)	Thermal pad / substrate connection	Not electrically isolated; must be soldered to copper pour for thermal dissipation (max 2 W at 25°C ambient).

Key Features

Feature	Design Value
No external components required	Internally compensated - eliminates need for external capacitor or resistor network, reducing BOM count and board area.
Tight initial tolerance	±2.5% output accuracy - avoids calibration overhead in precision analog signal chains and ADC reference supplies.
Low quiescent current	350 µA typical - extends battery life in always-on IoT edge sensors operating at µA-level sleep currents.
Wide operating temperature	–55°C to +125°C - qualified for under-hood automotive modules and industrial motor control enclosures.
Internal fault protection	Thermal shutdown + short-circuit current limit - prevents latch-up or destruction during wiring faults or PCB shorts.

Applications

Industrial Sensor Node Power

Microcontroller Core Supply

Use Scenario: Powering 3.3 V or 5 V microcontrollers (e.g., STM32L4, MSP430) and analog sensors (temperature, pressure) in sealed outdoor enclosures.

IC Role / Device Role / Timing Role: Local point-of-load regulator providing stable 4.85 V rail for sensor excitation and MCU I/O domain.

Use Value: Eliminates need for external feedback resistors or compensation caps, reducing footprint by >30% vs. adjustable LDOs.

Use Scenario: Supplying auxiliary logic rails in programmable logic controllers (PLCs) where EMI immunity and thermal reliability are critical.

IC Role / Device Role / Timing Role: Secondary voltage regulator delivering clean 4.85 V to FPGA configuration memory and interface transceivers.

Use Value: 50 µV_RMS noise and 64 dB ripple rejection prevent bit errors in SPI/I²C communication links.

Automotive Body Control Module

Medical Diagnostic Handheld

Use Scenario: Regulating power for LIN bus transceivers and LED drivers in door module ECUs exposed to under-dash thermal cycling.

IC Role / Device Role / Timing Role: Fixed-output regulator handling load dumps and cold-crank transients via integrated thermal foldback.

Use Value: Withstands –40°C to +105°C ambient with <1% output drift - meets AEC-Q100 Grade 2 thermal requirements.

Use Scenario: Providing regulated power to low-power op-amps and precision ADCs in portable ultrasound probe electronics.

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

Use Value: 50 µV_RMS noise and zero-phase-margin instability risk enable direct use without post-filtering stages.

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
TLV73348PDBVR	4.8 V output, 300 mA rating, 50 µA quiescent current, 250 mV dropout at 300 mA.	Lower IQ enables longer battery life; lower dropout supports tighter input margins; requires 1 µF output cap.	Prefer when input headroom is limited or system sleep current dominates power budget.
AP2204K-4.8TRG1	4.8 V output, 300 mA rating, 120 µA quiescent current, 400 mV dropout at 200 mA, no thermal shutdown.	Higher efficiency at light loads; lacks thermal protection - requires external thermal monitoring in enclosed designs.	Prefer in thermally managed consumer devices where continuous 200 mA load is rare and size is constrained.

Compared with ZSR485GTA, TLV73348PDBVR offers lower dropout and IQ but mandates external stabilization; AP2204K-4.8TRG1 reduces quiescent draw significantly but removes fault protection - both require layout redesign and qualification for safety-critical use.

Availability

ZSR485GTA is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, medical handheld diagnostics, and PLC auxiliary power requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ZSR485GTA 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/TS16949-certified analog IC manufacturer specializing in high-reliability discrete and linear power solutions before its acquisition by Diodes Incorporated in 2008.

ZSR Series regulators were developed for space-constrained, thermally demanding local regulation in industrial and automotive environments - emphasizing ruggedness, self-protection, and minimal external component count.

FAQ

Is ZSR485GTA still in production?

No - ZSR485GTA 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.

What is the maximum power dissipation for ZSR485GTA in SOT223?

Maximum power dissipation is 2 W at 25°C ambient, linearly derated to zero at 125°C. This assumes mounting on a 2-inch-square PCB with adequate copper area. At 200 mA load and 6.85 V input, power dissipation is ~410 mW - well within safe limits at room temperature.

Can ZSR485GTA be used without an input capacitor?

No - although the device is internally compensated and stable without output capacitance, a minimum 1 µF ceramic capacitor is required at the input (within 5 mm of pins 1 and 2) to suppress high-frequency noise and prevent oscillation during line transients, especially when sourced from inductive supplies.

Does pin 4 (tab) require a thermal pad connection?

Yes - pin 4 is the exposed thermal pad and forms the primary thermal path to the PCB. It must be soldered to a minimum 100 mm² copper pour connected to GND for effective heat dissipation. Leaving it unconnected reduces power handling capability by >60% and risks thermal shutdown under sustained load.

ZSR485GTA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: *

Package/Case:: -

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Output Configuration:: -

Output Type:: -

Number of Regulators:: -

Voltage - Input (Max):: -

Voltage - Output (Min/Fixed):: -

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: -

Current - Quiescent (Iq):: -

Current - Supply (Max):: -

PSRR:: -

Control Features:: -

Protection Features:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

ZSR485GTA FAQ

1.How can I place an order for ZSR485GTA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZSR485GTA 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 ZSR485GTA reliable?

The price and inventory of ZSR485GTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSR485GTA is usually 5 days.

3.What payment methods are accepted for ZSR485GTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSR485GTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZSR485GTA?

ZSR485GTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZSR485GTA 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 ZSR485GTA?

For technical support, including ZSR485GTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSR485GTA requirements.

6.How does Aetrix verify that ZSR485GTA is sourced from the original manufacturer or authorized distributors?

All ZSR485GTA 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 ZSR485GTA meets industry standards.

7.What is the process for return or replacement of ZSR485GTA?

All ZSR485GTA units undergo pre-shipment inspection (PSI). If there is an issue with ZSR485GTA, 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 ZSR485GTA part is unused and in its original packaging.

Return procedure for ZSR485GTA:

1.Submit a request within 90 days.

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

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