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

Diodes Incorporated ZMR250C

Name: ZMR250C
Brand: Diodes Incorporated
SKU: ZMR250C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZMR250C

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: ZMR250C.pdf

Description:: IC REG LINEAR 2.5V 50MA TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,055

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Product details

Overview

ZMR250C from Zetex Semiconductors is a fixed 2.5 V positive voltage regulator in SOT23 package, delivering up to 50 mA output current with only 30 µA quiescent current, internal short-circuit protection, and thermal shutdown-ideal for space-constrained, low-power battery-operated sensors and portable instrumentation.

For engineers reviewing the ZMR250C datasheet, ZMR250C pinout, ZMR250C application, or ZMR250C equivalent, this page provides verified electrical specs (2.438–2.563 V output, ±0.7 mV/°C tempco, 55–75 dB ripple rejection), SOT23 terminal mapping, real-world use cases in sensor front-ends and IoT edge nodes, and validated drop-in alternatives.

Technical Context

The ZMR250C implements a bandgap-referenced series pass architecture with integrated current limiting and thermal foldback. Its unconditionally stable design requires no external compensation and maintains regulation across an input range of 4.2 V to 22.5 V.

It delivers precise 2.5 V output with ≤30 mV load regulation (0–50 mA), ≤15 mV line regulation (4.5–22.5 V), and 65 µV_rms output noise (10 Hz–10 kHz), enabling direct use with precision ADC references and low-noise analog signal chains.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.5 V nominal; 2.438–2.563 V at 25°C, 2.360–2.640 V over –55 to 125°C - ensures stable reference for 12-bit ADCs without trimming.
Input Voltage Range	4.2 V to 22.5 V - supports wide-input industrial rails and battery stacks up to 18 V without external pre-regulation.
Max Output Current	50 mA - sufficient to power microcontroller cores, op-amps, and digital sensors simultaneously in compact nodes.
Quiescent Current	30 µA typical - enables >10-year battery life in coin-cell-powered wake-on-event systems.
Ripple Rejection	55–75 dB at 120 Hz - suppresses switching supply noise from DC-DC converters feeding mixed-signal SoCs.
Dropout Voltage	Typical 0.4 V at 50 mA - allows operation from 3 V Li-ion cells down to end-of-discharge (~2.7 V) while maintaining regulation.
Tempco	0.275–0.700 mV/°C - guarantees <±10 mV drift over full industrial temperature range, critical for calibrated sensor outputs.

Pinout & Package

SOT23-3 surface-mount package (JEDEC TO-236AB), 2.80 × 2.10 × 1.12 mm body, 0.95 mm lead pitch, designed for high-density PCB layouts and reflow compatibility.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage supply	Accepts 4.2–22.5 V unregulated input; internal current limit protects against sustained overcurrent.
2 (GND)	Ground reference	Common return for input, output, and internal bias; must be low-impedance for noise immunity.
3 (OUT)	Regulated 2.5 V output	Delivers stable 2.5 V to load; internally compensated - no external capacitor required for stability.

Key Features

Feature	Design Value
Unconditionally stable	No external output capacitor needed - eliminates BOM cost and layout area for decoupling in space-limited designs.
Thermal shutdown + current limit	Self-protecting under overload or ambient >125°C - prevents field failure without external circuitry.
Low-noise output	65 µV_rms (10 Hz–10 kHz) - avoids post-regulation filtering for precision analog front-ends.
Wide input range	Operates from 4.2 V up to 22.5 V - replaces multiple regulators in multi-rail systems with single-BOM option.
Industrial temp range	–55°C to +125°C operation - qualified for automotive under-hood, industrial PLC, and outdoor metering applications.

Applications

Portable Gas Sensor Node

Industrial RTD Signal Conditioning

Use Scenario: Battery-powered CO detector using electrochemical sensor and 12-bit SAR ADC.

IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for ADC and bias voltage for sensor amplifier.

Use Value: 30 µA quiescent current extends 2× AA battery life to >5 years; 65 µV_rms noise avoids measurement offset drift.

Use Scenario: 4-wire RTD bridge in factory-floor temperature transmitter with 4–20 mA loop.

IC Role / Device Role / Timing Role: Supplies excitation current reference and ADC reference voltage from 24 V rail.

Use Value: 22.5 V max input accepts full 24 V loop supply; ±0.7 mV/°C tempco ensures <0.1% span error over –40 to +85°C.

Smart Meter MCU Power Rail

IoT Edge Node PMU Core

Use Scenario: Sub-metering device with ultra-low-power MCU, RF transceiver, and metrology ASIC.

IC Role / Device Role / Timing Role: Generates clean 2.5 V core supply for metrology block and reference for internal DACs.

Use Value: 55–75 dB ripple rejection isolates metrology section from noisy SMPS; SOT23 footprint saves >1.5 mm² PCB area.

Use Scenario: BLE-enabled environmental sensor node powered by CR2032 coin cell.

IC Role / Device Role / Timing Role: Primary LDO for MCU and sensor interface; enables deep-sleep mode with minimal leakage.

Use Value: 30 µA I_Q dominates system sleep current - enables 10+ year battery life at 1 µA average system current.

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 (Microchip)	2.5 V, 250 mA output, 1.6 µA I_Q, but requires 1 µF ceramic output cap; dropout 600 mV @ 250 mA.	Higher current capability suits higher-power MCUs; lower I_Q benefits ultra-deep-sleep systems.	Select when >50 mA load or sub-µA sleep current is mandatory; verify stability with 1 µF output cap.
TLV70225DBVR (TI)	2.5 V, 300 mA, 24 µA I_Q, 170 mV dropout @ 300 mA, requires 0.1 µF ceramic cap, ±1.5% initial accuracy.	Better accuracy and lower dropout support tighter-tolerance analog circuits; higher drive for multi-peripheral nodes.	Choose for improved accuracy or lower dropout in 3.3 V system rails; confirm layout meets TI's ESD-sensitive handling requirements.

Compared with ZMR250C, MCP1700 offers 5× higher output current but demands external capacitance and lacks thermal shutdown; TLV70225 improves accuracy and dropout but trades off unconditional stability and ruggedness in harsh environments.

Availability

ZMR250C is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, smart metering, and IoT edge nodes requiring stable component supply with long lifecycle assurance and RoHS-compliant sourcing.

Supply support for ZMR250C 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) was a UK-based designer of high-performance analog and discrete semiconductors, ISO 9001 and TS16949 certified, focused on robust, low-power, and thermally resilient components.

The ZMR series was developed specifically for miniature, high-reliability voltage regulation in space-constrained, battery-powered, and industrial environments where simplicity, stability, and ruggedness outweigh raw performance metrics.

FAQ

Is ZMR250C stable without an output capacitor?

Yes - the ZMR250C is unconditionally stable per its datasheet and requires no external output capacitor for phase margin or transient response. This eliminates capacitor-related failures, saves board space, and reduces BOM count. Stability holds across all loads (0–50 mA), temperatures (–55°C to +125°C), and input voltages (4.2–22.5 V).

What is the minimum input voltage needed to maintain 2.5 V output at 50 mA?

The minimum input voltage is 3.9 V, specified as "VIN required to maintain regulation" in the datasheet. At 50 mA load and 25°C, typical dropout is ~0.4 V, so 2.5 V + 0.4 V = 2.9 V - but the guaranteed spec is 3.9 V to ensure regulation across temperature, process variation, and aging. Designers should maintain ≥4.2 V for margin.

Can ZMR250C replace ZMR25H in existing designs?

Yes - ZMR250C and ZMR25H share identical electrical specs (2.5 V output, 50 mA, 30 µA I_Q, same SOT23 pinout), but ZMR250C has extended input range (4.2–22.5 V vs. ZMR25H's 4.2–22.5 V - same value, confirmed in "Recommended Operating Conditions"). Both are active and pin-compatible; ZMR250C supersedes ZMR25H in new designs per Zetex documentation.

Does ZMR250C support automotive temperature range?

No - ZMR250C is rated for –55°C to +125°C ambient, which exceeds standard industrial range but does not meet AEC-Q100 Grade 2 (–40°C to +105°C) or Grade 1 (–40°C to +125°C) automotive qualification. It lacks automotive-specific reliability testing, traceability, and PPAP documentation; use only in non-safety-critical industrial or consumer applications.

ZMR250C 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):: 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:: Through Hole

Supplier Device Package:: TO-92

ZMR250C FAQ

1.How can I place an order for ZMR250C through Aetrix?

Please submit a Request for Quotation (RFQ) for ZMR250C 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 ZMR250C reliable?

The price and inventory of ZMR250C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMR250C is usually 5 days.

3.What payment methods are accepted for ZMR250C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMR250C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZMR250C?

ZMR250C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZMR250C 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 ZMR250C?

For technical support, including ZMR250C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMR250C requirements.

6.How does Aetrix verify that ZMR250C is sourced from the original manufacturer or authorized distributors?

All ZMR250C 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 ZMR250C meets industry standards.

7.What is the process for return or replacement of ZMR250C?

All ZMR250C units undergo pre-shipment inspection (PSI). If there is an issue with ZMR250C, 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 ZMR250C part is unused and in its original packaging.

Return procedure for ZMR250C:

1.Submit a request within 90 days.

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

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