Diodes Incorporated AP7350-33CF4-7

Overview

AP7350-33CF4-7 from Diodes Incorporated is a 3.3V fixed-output, 150mA ultra-low quiescent current LDO regulator in a wafer-level chip-scale X2-WLB0606-4 package. It delivers ±1% output voltage accuracy across -40°C to +85°C, features 0.25µA typical quiescent current and 0.02µA standby current, and supports 2.0V–5.25V input range - optimized for wearable electronics and IoT sensor modules requiring extended battery life.

For engineers reviewing the AP7350-33CF4-7 datasheet, AP7350-33CF4-7 pinout, AP7350-33CF4-7 application, or AP7350-33CF4-7 equivalent, key selection criteria include dropout voltage at 150mA (0.16V typ. @3.3V), EN-controlled shutdown capability, thermal resistance (θ_JA = 267°C/W), and compatibility with 0.1µF ceramic input/output capacitors in space-constrained designs.

Technical Context

The AP7350-33CF4-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and enable logic in a monolithic CMOS structure. Its internal resistor network fixes V_OUT at 3.3V, eliminating external feedback components. The device operates without output discharge (non-D variant), distinguishing it from the AP7350D-33CF4-7.

It achieves regulation via closed-loop feedback with load regulation of ±25mV (1–150mA) and line regulation of 0.02%/V. The EN pin accepts logic-level control (V_IL ≤ 0.4V, V_IH ≥ 1.0V), enabling seamless integration into low-power microcontroller wake/sleep sequences.

Key Specifications

Pinout & Package

The AP7350-33CF4-7 uses the X2-WLB0606-4 wafer-level chip-scale package (0.64mm × 0.64mm × 0.34mm, 0.01g), featuring SnAgCu solder balls and moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-3302E/TO and XC6210B332MR-G, the AP7350-33CF4-7 uniquely combines sub-µA quiescent current, integrated enable, and industry-smallest WLCSP footprint - making it optimal for next-generation miniaturized, battery-constrained devices where board space and energy efficiency are co-critical.

Availability

AP7350-33CF4-7 is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor modules, and wireless camera applications requiring stable component supply, high-volume tape-and-reel delivery, and long-term lifecycle support.

Supply support for AP7350-33CF4-7 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 AP7350 series belongs to Diodes' ultra-low-power LDO portfolio, engineered specifically for battery-operated portable and wearable devices where minimal quiescent current and minimal PCB footprint are primary design constraints.

FAQ

What is the maximum output current and corresponding dropout voltage for AP7350-33CF4-7?

The AP7350-33CF4-7 delivers up to 150mA output current. At this load, its typical dropout voltage is 0.16V (max 0.35V), meaning it maintains regulation as long as VIN remains ≥3.46V. This value is measured at TA = +25°C with VOUT = 3.3V and defined per the 2% VOUT deviation criterion in the datasheet's Electrical Characteristics table.

Can the EN pin be left unconnected or tied to VIN permanently?

No - the EN pin must never be left floating, as that may cause unpredictable regulator behavior. If enable functionality is not needed, tie EN directly to VIN (not through a resistor) to ensure reliable turn-on. Pulling EN below 0.4V disables the output and reduces current draw to 0.02µA standby level.

Is an output capacitor mandatory, and what type is recommended?

Yes - a minimum 0.1µF ceramic capacitor (X5R or X7R dielectric) is required between VOUT and GND for stability and transient response. Low-ESR ceramics are strongly preferred; tantalum or aluminum electrolytics are not recommended due to higher ESR and potential instability. Place the capacitor within 1mm of the VOUT and GND pins.

Does AP7350-33CF4-7 include output discharge functionality?

No - AP7350-33CF4-7 is the non-discharge variant. When disabled via EN, the output remains floating and retains charge until discharged by the load or external circuitry. For active output discharge, select AP7350D-33CF4-7, which integrates a 35Ω internal discharge path from VOUT to GND upon shutdown.