Diodes Incorporated ZMR250FTA

Overview

ZMR250FTA from Diodes Incorporated is a fixed-output 2.5 V low-dropout linear voltage regulator in SOT23-3 package, delivering up to 50 mA output current with only 30 µA quiescent current, ±2.5% initial output accuracy (2.438–2.563 V), and 22.5 V maximum input voltage - ideal for powering low-power microcontrollers in space-constrained consumer electronics.

For engineers reviewing the ZMR250FTA datasheet, ZMR250FTA pinout, ZMR250FTA application, or ZMR250FTA equivalent, key selection criteria include dropout voltage behavior across temperature, load regulation stability under 0–50 mA, ripple rejection at 120 Hz, thermal shutdown integrity, and SOT23 PCB layout compatibility for high-reliability embedded supply rails.

Technical Context

The ZMR250FTA employs a bandgap-referenced shunt-regulator topology with internal current limiting and thermal shutdown, operating as a three-terminal positive voltage regulator without external compensation components. Its unconditionally stable design requires no output capacitor for operation, though COUT improves transient response.

It functions within an input range of 4.2 V to 22.5 V and maintains regulation down to a minimum input–output differential of ~0.4 V at 50 mA (per typical characteristics), with output voltage drift limited to 0.275–0.700 mV/°C over –55°C to +125°C.

Key Specifications

Pinout & Package

Supplied in SOT23-3 package (JEDEC TO-236AB), 2.9 mm × 1.3 mm footprint, 1.1 mm height, with gull-wing leads optimized for automated assembly and thermal dissipation on 2-layer PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO regulator applications.

Compared with MCP1700T-2502E/TT and AP2210K-2.5TRG1, the ZMR250FTA uniquely balances 22.5 V input tolerance, 50 mA drive, and 30 µA IQ in a no-capacitor-required SOT23 package - making it optimal for cost-sensitive, space-limited 2.5 V supply nodes where moderate current and wide input range coexist.

Availability

ZMR250FTA is available at Aetrix Electronics and suitable for smart remote controls, DVD/Blu-ray player logic supplies, security system sensor nodes, and set-top box microcontroller cores requiring stable component supply with guaranteed long-term manufacturability.

Supply support for ZMR250FTA 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, serving industrial, computing, consumer, and communications markets with high-reliability, cost-optimized components.

The ZMR series belongs to Diodes' precision voltage reference and fixed LDO regulator product line, engineered specifically for low-power, space-constrained applications where simplicity, stability, and extended battery life are critical design objectives.

FAQ

Is ZMR250FTA stable without an output capacitor?

Yes. The ZMR250FTA is unconditionally stable per its datasheet and does not require an external output capacitor for regulation. While adding a 1 µF ceramic capacitor improves load transient response and PSRR above 10 kHz, it is optional - simplifying BOM and reducing PCB area in size-sensitive designs.

What is the minimum input voltage needed for regulation at 50 mA?

The ZMR250FTA requires a minimum input voltage of 3.9 V to maintain 2.5 V output regulation at 25°C (per datasheet). At full load and elevated temperature, the dropout increases slightly; typical dropout is ~0.4 V at 50 mA, so 2.9 V input would be insufficient - 3.9 V is the guaranteed minimum across conditions.

Does ZMR250FTA include reverse-polarity protection?

No. The ZMR250FTA lacks integrated reverse-voltage protection. If input polarity reversal is possible in the system, an external series Schottky diode (e.g., 1N5711) or PMOS FET must be added to prevent device damage - this adds ~0.2–0.3 V forward drop or gate-drive complexity.

Can ZMR250FTA be used in automotive environments?

It is not AEC-Q200 qualified and is rated for –55°C to +125°C junction temperature, but lacks automotive-specific qualification, transient immunity testing (ISO 7637), or guaranteed PPAP documentation. It may function in non-safety-critical cabin modules with proper derating and external protection, but Diodes does not endorse or warrant automotive use.