Diodes Incorporated ZXCL330H5TA

Overview

ZXCL330H5TA from Zetex Semiconductors is a 3.3 V fixed-output, micropower low-dropout linear regulator in SC70-5 package, designed for space-constrained battery-powered systems. It delivers up to 150 mA output current with 85 mV dropout at 50 mA load, 50 µA ground pin current at full load, and <10 nA shutdown supply current. Its no-load stability and compatibility with low-ESR ceramic capacitors make it suitable for CMOS RAM backup and portable instrumentation.

For engineers reviewing the ZXCL330H5TA datasheet, ZXCL330H5TA pinout, ZXCL330H5TA application, or ZXCL330H5TA equivalent, key selection criteria include ultra-low quiescent current, SC70-5 footprint constraints, enable-controlled shutdown behavior, and dropout performance under light-to-moderate load conditions in energy-sensitive designs.

Technical Context

The ZXCL330H5TA uses a PMOS pass transistor architecture enabling low ground current across operating conditions-including dropout, startup, and full load-while maintaining regulation down to input voltages as low as 1.3 V above ground. Its internal enable circuit features TTL/CMOS-compatible logic threshold (VENH ≥ 2.2 V, VENL ≤ 0.8 V) and 150 mV hysteresis for noise-immune control.

Thermal overload protection activates at ≥125 °C junction temperature, cycling output until cooling occurs; over-current limit ranges from 160 mA to 800 mA depending on variant and conditions. The device operates stably with 1 µF minimum ceramic output capacitance (X7R dielectric recommended) and requires no bypass capacitor for low-noise operation (50 µV_RMS, 10 Hz–100 kHz).

Key Specifications

Pinout & Package

The ZXCL330H5TA is housed in an SC70-5 surface-mount package (1.1 mm × 1.3 mm × 0.5 mm), optimized for ultra-dense PCB layouts. Its thermal resistance (θ_JA) ranges from 280 °C/W (multi-layer board) to 450 °C/W (single-sided board), requiring careful power derating above 60 °C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout regulator applications.

Compared with MCP1700T-3302E/TT and NCP1117ST33T3G, the ZXCL330H5TA uniquely balances ultra-small SC70-5 size, sub-10 nA shutdown, and 85 mV dropout-making it irreplaceable in space- and energy-critical portable designs where alternatives trade off either footprint, quiescent power, or integration.

Availability

ZXCL330H5TA is available at Aetrix Electronics and suitable for cellular handsets, portable medical sensors, handheld test instruments, and PCMCIA interface modules requiring stable component supply with guaranteed long-term continuity.

Supply support for ZXCL330H5TA 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) is a UK-based designer of high-performance analog and discrete semiconductors, ISO 9001 and TS16949 certified, with focus on efficiency, miniaturization, and reliability.

The ZXCL series was developed specifically for ultra-low-power, space-constrained portable electronics-emphasizing micropower operation, SC70 packaging, and no-load stability for memory backup and intermittent-use applications.

FAQ

What is the minimum input voltage required for regulation at 3.3 V output?

The ZXCL330H5TA begins regulating when VIN exceeds approximately 1.3 V, but for reliable operation, VIN must be at least VOUT + 0.5 V (i.e., ≥3.8 V). At 50 mA load, dropout is 85 mV, so regulation is maintained down to VIN = 3.385 V-though datasheet recommends ≥3.8 V for margin across temperature and tolerance.

Can the NC pin be connected to ground or left floating?

The NC pin is internally unconnected and must be left floating or tied to GND per Zetex layout guidance; connecting it to any active node may cause unpredictable behavior. No electrical function is assigned to this terminal, and grounding it does not affect regulation, stability, or thermal performance.

Does the ZXCL330H5TA require an input capacitor?

Yes-an input capacitor of at least 1 µF (ceramic or tantalum) is recommended to filter supply noise and improve ripple rejection. Placement close to the VIN and GND pins is essential; a ground plane layout further enhances noise immunity and transient response without altering basic functionality.

How does thermal shutdown behave during continuous overload?

When junction temperature reaches 125–165 °C, the device shuts down output and remains off until cooled below the hysteresis threshold (~100–120 °C), then re-enables. This cycling continues indefinitely under sustained overload, protecting the IC without requiring external intervention or latch-off circuitry.