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

Diodes Incorporated ZSR300GTC

Name: ZSR300GTC
Brand: Diodes Incorporated
SKU: ZSR300GTC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZSR300GTC

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: ZSR300GTC.pdf

Description:: IC REG LINEAR 3V 200MA SOT223

Quantity:: RFQ Add To RFQ list

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Inventory:3,958

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Product details

Overview

ZSR300GTC from Zetex Semiconductors is a fixed 3.0 V positive linear voltage regulator in SOT223 package, designed for local regulation in space-constrained PCBs. It delivers up to 200 mA output current, maintains ±2.5% initial output tolerance, operates across –55°C to +125°C, and requires no external compensation components. It is used in industrial sensor nodes where stable low-noise 3.0 V supply is critical for analog front-end accuracy.

For engineers reviewing the ZSR300GTC datasheet, ZSR300GTC pinout, ZSR300GTC application, or ZSR300GTC equivalent, key selection criteria include dropout voltage (4.7 V min input), quiescent current (350–600 µA), thermal shutdown behavior, and SOT223 thermal performance under 200 mA load at elevated ambient temperatures.

Technical Context

The ZSR300GTC integrates internal current limiting and thermal shutdown circuitry, enabling robust operation during overload or fault conditions without external protection. Its architecture eliminates need for external capacitors for stability, unlike many LDOs requiring output capacitance with ESR constraints.

It exhibits low output noise (75 µV_rms, 10 Hz–10 Hz) and high ripple rejection (48–62 dB at 120 Hz), making it suitable for analog signal chains adjacent to switching power supplies. Input voltage range is 5.0 V to 20 V, with minimum required input of 4.7 V to maintain regulation at full load.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.0 V ±2.5% (2.92–3.08 V at 100 mA, 25°C); tight tolerance enables direct powering of 3.0 V logic without post-regulation trimming.
Max Output Current	200 mA; sufficient for microcontroller cores, op-amps, and small-signal sensors without thermal derating below 85°C ambient.
Quiescent Current	350–600 µA; ultra-low standby draw supports battery-backed systems with multi-year shelf life.
Line Regulation	10–40 mV over 5–20 V input; minimal output shift ensures consistent ADC reference voltage despite upstream supply variation.
Load Regulation	5–25 mV from 1–200 mA load; maintains <±0.8% output deviation across full current range, critical for precision analog sensing.
Thermal Shutdown	Active above design junction limit; protects device during sustained overload or poor PCB heatsinking without external circuitry.
Operating Temp	–55°C to +125°C; qualified for extended industrial and automotive under-hood environments without derating.

Pinout & Package

SOT223 package with exposed thermal pad (pin 4), rated for 2 W dissipation at 25°C ambient on 2-inch² PCB. Pin 4 must be connected to pin 2 (GND) or left electrically isolated per layout requirements.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage terminal	Accepts 5.0–20 V DC; minimum 4.7 V required to sustain 3.0 V output at 200 mA load.
2 (GND)	Ground reference	Common return for input, output, and internal bias circuits; connects to thermal pad (pin 4) for optimal heat transfer.
3 (OUT)	Regulated output	Delivers stable 3.0 V ±2.5%; no external capacitor needed for stability-fully self-contained regulation.
4 (EPAD)	Exposed thermal pad	Internally connected to GND; soldering to PCB copper improves thermal resistance by ~20°C/W versus floating pad.

Key Features

Feature	Design Value
No external components required	Stable operation with zero external capacitors-reduces BOM count and board area in compact modules.
Internal short-circuit current limit	Peak output current limited to ~400 mA (typ.) at 25°C; prevents catastrophic failure during output shorts.
Tight initial voltage tolerance	±2.5% output accuracy at 25°C eliminates need for factory calibration in cost-sensitive instrumentation.
Low temperature coefficient	0.1 mV/°C average drift (IO = 5 mA); contributes <±1.3 mV error over –40°C to +85°C operating range.
High ripple rejection	≥48 dB at 120 Hz; suppresses switching noise from upstream DC/DC converters feeding sensitive analog circuitry.

Applications

Industrial Sensor Node

Portable Medical Monitor

Use Scenario: Local 3.0 V supply for MEMS pressure sensor and 16-bit sigma-delta ADC in battery-powered field transmitter.

IC Role / Device Role / Timing Role: Primary voltage regulator providing clean, stable rail for analog signal conditioning and data acquisition.

Use Value: 75 µV_rms output noise and <±0.8% load regulation preserve ADC ENOB and eliminate post-acquisition gain correction.

Use Scenario: Powering low-power ECG front-end amplifier and Bluetooth LE SoC in handheld diagnostic device.

IC Role / Device Role / Timing Role: Fixed-output LDO supplying regulated 3.0 V to mixed-signal ICs with burst-mode RF transmission.

Use Value: 350 µA quiescent current extends battery life beyond 12 months; thermal shutdown prevents overheating during RF transmit peaks.

Automotive Body Control Module

Smart Energy Meter

Use Scenario: Local regulation for LIN transceiver and microcontroller I/O in door module exposed to under-hood temperature extremes.

IC Role / Device Role / Timing Role: Robust 3.0 V source tolerant of load dump transients and wide ambient swings (–40°C to +105°C).

Use Value: –55°C to +125°C rating and internal thermal shutdown ensure reliable operation without external supervision circuitry.

Use Scenario: Providing stable 3.0 V for metrology ADC and real-time clock in utility-grade electricity meter with 15-year field life.

IC Role / Device Role / Timing Role: Precision local regulator maintaining reference stability despite fluctuating mains-derived input voltage.

Use Value: 0.1 mV/°C tempco and 10–40 mV line regulation minimize measurement drift across seasonal temperature cycles.

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
LM317LZ/LM317L	Adjustable output (1.25–37 V); requires two external resistors; higher quiescent current (5–10 mA).	Used where output voltage flexibility or higher current (>200 mA) is needed; not drop-in for fixed 3.0 V designs.	Select only if adjustable output or >200 mA capability is required; adds BOM cost and layout complexity.
MCP1700T-3002E/OT	Lower quiescent current (1.6 µA typ.), but max 250 mA output and narrower input range (2.7–13.2 V); no thermal shutdown.	Suitable for ultra-low-power IoT endpoints, but lacks fault protection for industrial environments.	Prefer for battery longevity in sleep-dominated applications; avoid where short-circuit robustness is mandatory.

Compared with LM317LZ and MCP1700T-3002E/OT, the ZSR300GTC uniquely combines fixed 3.0 V output, integrated thermal/short-circuit protection, and SOT223 power handling-making it optimal for ruggedized local regulation where reliability trumps ultra-low IQ.

Availability

ZSR300GTC is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply with long-term lifecycle assurance.

Supply support for ZSR300GTC 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 manufacturer specializing in high-reliability analog and discrete semiconductors before its acquisition by Diodes Incorporated in 2008.

The ZSR Series was developed for space-constrained local regulation in harsh environments, emphasizing fault resilience (thermal/short-circuit protection), wide temperature operation, and zero-external-component stability-targeting industrial and automotive subsystems.

FAQ

Is ZSR300GTC pin-compatible with other SOT223 regulators like the LM1117?

No. ZSR300GTC uses a non-standard SOT223 pinout: pin 1 = IN, pin 2 = GND, pin 3 = OUT, pin 4 = EPAD (GND-connected). LM1117 variants use pin 1 = GND, pin 2 = OUT, pin 3 = IN-direct replacement would cause immediate short circuit. Layout redesign is mandatory.

What is the minimum input voltage required for ZSR300GTC to regulate at full 200 mA load?

The datasheet specifies 4.7 V minimum input voltage at T_J = 25°C and I_O = 200 mA. At higher ambient temperatures or with reduced PCB copper area, this increases due to thermal derating; for 85°C ambient and standard 2-inch² board, allow ≥5.2 V to guarantee regulation.

Does ZSR300GTC require an input bypass capacitor?

While not required for stability, a 1 µF or larger ceramic capacitor at the input is strongly recommended-especially when powered from inductive sources-to prevent voltage overshoot during thermal shutdown events, which could exceed the 20 V absolute maximum rating.

Can ZSR300GTC be used in parallel to increase output current?

No. The ZSR300GTC lacks current-sharing features such as remote sense or current-limit matching. Parallel connection risks thermal runaway due to parametric mismatch in dropout voltage and quiescent current, leading to uneven current distribution and premature failure of one device.

ZSR300GTC 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):: 3V

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

ZSR300GTC FAQ

1.How can I place an order for ZSR300GTC through Aetrix?

Please submit a Request for Quotation (RFQ) for ZSR300GTC 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 ZSR300GTC reliable?

The price and inventory of ZSR300GTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZSR300GTC is usually 5 days.

3.What payment methods are accepted for ZSR300GTC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZSR300GTC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZSR300GTC?

ZSR300GTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZSR300GTC 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 ZSR300GTC?

For technical support, including ZSR300GTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZSR300GTC requirements.

6.How does Aetrix verify that ZSR300GTC is sourced from the original manufacturer or authorized distributors?

All ZSR300GTC 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 ZSR300GTC meets industry standards.

7.What is the process for return or replacement of ZSR300GTC?

All ZSR300GTC units undergo pre-shipment inspection (PSI). If there is an issue with ZSR300GTC, 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 ZSR300GTC part is unused and in its original packaging.

Return procedure for ZSR300GTC:

1.Submit a request within 90 days.

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

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