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

Diodes Incorporated ZMR250FTC

Name: ZMR250FTC
Brand: Diodes Incorporated
SKU: ZMR250FTC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZMR250FTC

Manufacturer:: Diodes Incorporated

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

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: ZMR250FTC.pdf

Description:: IC REG LINEAR 2.5V 50MA SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:4,898

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Product details

Overview

ZMR250FTC from Zetex Semiconductors is a fixed 2.5 V positive voltage regulator in SOT23 package, featuring 30 µA quiescent current, 50 mA output capability, and input voltage range of 4.2–22.5 V. It integrates internal current limiting and thermal shutdown, and is unconditionally stable with no external capacitor required - ideal for space-constrained battery-powered sensor nodes and portable instrumentation.

For engineers reviewing the ZMR250FTC datasheet, ZMR250FTC pinout, ZMR250FTC application, or ZMR250FTC equivalent, this page delivers verified electrical specs (VO = 2.5 V ±2.5%, line/load regulation ≤30 mV), thermal behavior (−55°C to +125°C operation), SOT23 pin mapping, and validated alternatives for low-power LDO replacement in industrial and medical edge devices.

Technical Context

The ZMR250FTC is a monolithic, three-terminal linear regulator using bandgap reference and error amplifier topology. Its dropout voltage is specified at 0.4 V (typ.) at 50 mA load and 25°C, enabling operation from low-input sources such as single Li-ion cells after buck conversion.

It employs internal short-circuit protection and thermal foldback, with power dissipation limited to 500 mW at 25°C ambient (SOT23 package). Ripple rejection reaches 75 dB at 120 Hz, and output noise is 65 µV_rms (10 Hz–10 kHz), supporting precision analog front-ends.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.5 V ±2.5% over −55°C to +125°C; ensures stable reference for ADCs and comparators without trimming.
Quiescent Current	30 µA typical; enables >1-year battery life in 10 µA sleep-mode systems with 200 mAh coin cell.
Max Output Current	50 mA continuous; sufficient to power microcontroller cores, I²C peripherals, and low-current op-amps.
Input Voltage Range	4.2 V to 22.5 V; supports wide-input industrial rails and automotive cold-crank scenarios down to 4.2 V.
Ripple Rejection	75 dB at 120 Hz; suppresses switching noise from upstream DC/DC converters feeding sensitive analog circuitry.
Dropout Voltage	0.4 V at 50 mA (25°C); allows regulation from 2.9 V input - critical for single-cell LiFePO₄ or boosted alkaline supplies.
Operating Temp	−55°C to +125°C; qualified for under-hood automotive, outdoor telecom, and military-grade embedded control.

Pinout & Package

SOT23-3 package (JEDEC MO-178AA), 2.9 mm × 1.3 mm × 1.0 mm body, surface-mount, lead-free and RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage supply	Accepts unregulated DC input; requires local 100 nF ceramic decoupling within 3 mm of pin.
2 (GND)	Ground reference	System ground return path; must connect directly to low-impedance PCB ground plane to minimize noise coupling.
3 (OUT)	Regulated output	Delivers stable 2.5 V; no output capacitor required for stability, but 1 µF improves transient response.

Key Features

Feature	Design Value
Unconditionally stable	No external output capacitor needed - eliminates BOM cost and board area for stability compensation.
Thermal shutdown	Activates at ~150°C junction temperature; prevents permanent damage during sustained overload or poor heatsinking.
Internal current limit	~100 mA short-circuit current; protects both device and upstream supply during output fault conditions.
Low-noise output	65 µV_rms (10 Hz–10 kHz); avoids signal corruption in precision 12-bit+ data acquisition paths.
Wide input range	4.2 V to 22.5 V; accommodates variable input sources including rectified AC, solar harvesters, and legacy 24 V industrial rails.

Applications

Industrial Sensor Node

Portable Medical Monitor

Use Scenario: Battery-powered temperature/humidity sensor transmitting via BLE every 30 seconds.

IC Role / Device Role / Timing Role: Primary 2.5 V supply for MCU, sensor IC, and RF transceiver; provides clean bias for ADC reference.

Use Value: 30 µA quiescent current extends CR2032 battery life beyond 2 years; 50 mA peak supports radio burst transmission.

Use Scenario: Handheld ECG front-end with 16-bit sigma-delta ADC and OLED display.

IC Role / Device Role / Timing Role: Low-noise 2.5 V reference rail for ADC and analog signal conditioning stage.

Use Value: 65 µV_rms noise and 75 dB ripple rejection preserve ENOB >14 bits; −55°C to +125°C rating covers clinical and field use.

Automotive Body Control Module

Smart Meter Power Management

Use Scenario: Under-dash lighting controller exposed to engine bay thermal cycling and load dump transients.

IC Role / Device Role / Timing Role: Post-regulator supplying microcontroller and CAN transceiver after 5 V buck converter.

Use Value: 22.5 V max input withstands ISO 7637-2 pulse 5a (load dump); thermal shutdown prevents latch-up during prolonged 125°C ambient.

Use Scenario: Utility smart meter with real-time clock, metrology ASIC, and PLC communication interface.

IC Role / Device Role / Timing Role: Precision 2.5 V supply for metrology ADC reference and RTC oscillator circuit.

Use Value: 0.7 mV/°C tempco ensures <±0.5% reference drift across −40°C to +85°C operating range; unconditionally stable with no cap.

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
MCP1700T-2502E/TT	2.5 V, 250 mA, 1.6 µA IQ, but requires 1 µF output capacitor; dropout = 178 mV @ 250 mA.	Higher output current suits higher-power MCU variants; ultra-low IQ benefits multi-year IoT deployments.	Select when >50 mA load or sub-µA standby is required; verify stability with recommended ceramic cap.
TLV70725PDQNR	2.5 V, 300 mA, 25 µA IQ, 170 mV dropout @ 300 mA; requires 0.1–10 µF output cap; PSRR = 60 dB @ 1 kHz.	Better PSRR at high frequencies; wider output current headroom for future design scaling.	Choose for mixed-signal SoC power domains needing higher current and mid-frequency noise suppression.

Compared with MCP1700T-2502E/TT and TLV70725PDQNR, the ZMR250FTC offers lower cost, capacitor-free stability, and proven ruggedness in harsh environments - making it optimal where reliability, simplicity, and thermal resilience outweigh raw current or ultra-low-IQ requirements.

Availability

ZMR250FTC is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, automotive body control modules, and smart meter power management requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ZMR250FTC 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 (now part of Diodes Incorporated) was a UK-based designer of high-performance analog and discrete semiconductors, ISO 9001 and TS16949 certified, focused on robust, application-optimized components for industrial and automotive markets.

The ZMR series was engineered specifically for space-constrained, low-power linear regulation tasks - emphasizing unconditional stability, wide input range, and thermal survivability without external components.

FAQ

Is ZMR250FTC still in active production?

No - ZMR250FTC is marked "Obsolete" per Zetex's official product status key (Issue 9 datasheet, p.12). It is no longer manufactured, but Aetrix Electronics maintains legacy inventory with full traceability and supports obsolescence mitigation through cross-reference analysis and second-source qualification.

Can ZMR250FTC operate without an output capacitor?

Yes - the ZMR250FTC is unconditionally stable per its datasheet (p.1), requiring no output capacitor for stability. However, adding a 1 µF X7R ceramic capacitor at the output improves load transient response by reducing peak deviation from ±0.4 V to ±0.15 V (p.7).

What is the minimum input voltage needed to maintain 2.5 V output?

The minimum input voltage is 3.9 V (p.2, "Input voltage required to maintain regulation"). This corresponds to a dropout of 1.4 V at light load - consistent with the 0.4 V typical dropout at 50 mA, confirming the device enters dropout below 3.9 V under all operating conditions.

How does ZMR250FTC handle thermal overload?

It features internal thermal shutdown that activates at approximately 150°C junction temperature (p.1), reducing output current to near zero until die temperature falls below the hysteresis threshold (~135°C), preventing permanent damage during sustained overload or inadequate PCB copper area.

ZMR250FTC Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 22.5V

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 50mA

Current - Quiescent (Iq):: 40 µA

Current - Supply (Max):: -

PSRR:: 75dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

ZMR250FTC FAQ

1.How can I place an order for ZMR250FTC through Aetrix?

Please submit a Request for Quotation (RFQ) for ZMR250FTC 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 ZMR250FTC reliable?

The price and inventory of ZMR250FTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMR250FTC is usually 5 days.

3.What payment methods are accepted for ZMR250FTC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMR250FTC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZMR250FTC?

ZMR250FTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZMR250FTC 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 ZMR250FTC?

For technical support, including ZMR250FTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMR250FTC requirements.

6.How does Aetrix verify that ZMR250FTC is sourced from the original manufacturer or authorized distributors?

All ZMR250FTC 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 ZMR250FTC meets industry standards.

7.What is the process for return or replacement of ZMR250FTC?

All ZMR250FTC units undergo pre-shipment inspection (PSI). If there is an issue with ZMR250FTC, 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 ZMR250FTC part is unused and in its original packaging.

Return procedure for ZMR250FTC:

1.Submit a request within 90 days.

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

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