Diodes Incorporated ZMR330FTA

Overview

ZMR330FTA from Diodes Incorporated is a fixed-output 3.3 V low-dropout linear voltage regulator in SOT23 package, delivering up to 50 mA output current with only 120–170 µA quiescent current over –55°C to +125°C. It operates across 5 V to 24 V input range, features internal short-circuit and thermal shutdown protection, and targets local low-current power rails for microcontrollers and consumer electronics.

For engineers reviewing the ZMR330FTA datasheet, ZMR330FTA pinout, ZMR330FTA application, or ZMR330FTA equivalent, key selection criteria include dropout voltage behavior at temperature, load/line regulation stability under 50 mA, ripple rejection at 120 Hz, output noise (80 µV_rms), and SOT23 thermal derating limits.

Technical Context

The ZMR330FTA uses a bandgap-referenced series pass transistor architecture with integrated current limiting and thermal foldback. Its unconditionally stable design requires no external compensation and maintains regulation down to 4.74 V input at full load.

It delivers 3.3 V ±2.5% over temperature (–55°C to +125°C) and load (0–50 mA), with line regulation of 5–15 mV across 5–24 V input and load regulation of 13–30 mV from 0–50 mA. Ripple rejection is 55 dB at 120 Hz with 6–20 V input.

Key Specifications

Pinout & Package

Package: SOT23-3 (JEDEC TO-236AB), surface-mount, lead-free, RoHS-compliant. Dimensions: 2.9 mm × 1.35 mm × 1.0 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/MB and AP2210K-3.3TRG1, the ZMR330FTA offers the best balance of ultra-low I_Q among high-voltage LDOs while maintaining proven thermal safety and unconditional stability in space-constrained SOT23 layouts.

Availability

ZMR330FTA is available at Aetrix Electronics and suitable for consumer electronics, security system sensor nodes, and industrial microcontroller core supplies requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for ZMR330FTA 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, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The ZMR series belongs to Diodes' precision voltage regulator product line, engineered specifically for cost-sensitive, space-constrained applications where low quiescent current, wide input range, and inherent fault protection are critical - especially in consumer, computing, and industrial edge devices.

FAQ

What is the minimum input voltage required for ZMR330FTA to maintain regulation?

The ZMR330FTA requires a minimum input voltage of 4.74 V to sustain 3.3 V output under full 50 mA load, per datasheet test conditions. This corresponds to a typical dropout voltage of ~1.44 V at 50 mA and 25°C. Dropout increases with temperature and load, so designs should maintain ≥5 V nominal input for margin across operating conditions.

Does ZMR330FTA require an output capacitor, and what type is recommended?

Yes - a minimum 1 µF ceramic capacitor (X5R or X7R, 6.3 V rated) is required on the output for stability and transient response, per the DS32195 datasheet. Larger values (e.g., 2.2–10 µF) improve load transient suppression but are not mandatory. Tantalum or aluminum electrolytic capacitors are not recommended due to ESR sensitivity and potential instability.

How does thermal derating affect maximum power dissipation in SOT23 package?

In the SOT23 package, ZMR330FTA's maximum power dissipation is 500 mW at +25°C ambient, linearly derated to zero at +125°C. At +85°C ambient, usable power drops to ~300 mW. For 50 mA load and 24 V input, power dissipation is ~1.05 W - exceeding package limits; thus, input voltage must be minimized or heatsinking added for high-V_IN/high-I_O use.

Is ZMR330FTA qualified for automotive applications?

No - ZMR330FTA is not AEC-Q100 qualified and lacks automotive-grade screening, extended temperature validation beyond –55°C to +125°C, or PPAP documentation. While it operates across that temperature range, Diodes Incorporated positions it for industrial and consumer applications; automotive designs should select AEC-Q100 LDOs such as the AP7361Q or AZ1085.