Diodes Incorporated AP7354D-28W5-7

Overview

AP7354D-28W5-7 from Diodes Incorporated is a 2.8V fixed-output, 150mA ultra-low quiescent current LDO regulator in SOT25 package with integrated enable control and active output discharge. It delivers ±1% output voltage accuracy over -40°C to +85°C, supports 2.0V–5.5V input range, and draws only 0.25µA quiescent current - enabling multi-year battery life in wearable sensors and IoT edge nodes.

For engineers reviewing the AP7354D-28W5-7 datasheet, AP7354D-28W5-7 pinout, AP7354D-28W5-7 application, or AP7354D-28W5-7 equivalent, key selection criteria include dropout voltage at 150mA (0.19V typ), EN logic thresholds (0.4V low / 1.0V high), active discharge resistance (35Ω), and thermal performance in SOT25 (θ_JA = 162°C/W).

Technical Context

The AP7354D-28W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and enable-controlled pass transistor. Its architecture supports fast load transient response (e.g., <50µs recovery for 1mA→50mA step at V_OUT=3.3V) and stable operation with 0.1µF ceramic C_IN/C_OUT.

Unlike non-discharge variants, this D-suffix version includes an internal NMOS discharge switch between V_OUT and GND, activated when EN is low - ensuring rapid V_OUT decay (<1ms typical) to prevent back-powering or latch-up in power-sequenced systems.

Key Specifications

Pinout & Package

SOT25 package: 5-pin surface-mount plastic package (3.0mm × 2.8mm × 1.3mm), lead-free, RoHS-compliant, with tin-plated leads solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2802E/TO and XC6206P282MR-G, AP7354D-28W5-7 uniquely combines sub-µA quiescent current, integrated enable, and active discharge in a compact SOT25 - making it the only option that simultaneously satisfies ultra-low power, programmable shutdown, and fast output decay requirements.

Availability

AP7354D-28W5-7 is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor modules, and wireless communication devices requiring stable component supply with long-term lifecycle assurance.

Supply support for AP7354D-28W5-7 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design, manufacturing, and distribution operations across Asia, the Americas, and Europe.

The AP7354 series targets ultra-low-power battery-operated applications, delivering high-accuracy regulation with minimal quiescent consumption - specifically engineered for wearables, IoT endpoints, and energy-harvesting systems.

FAQ

What is the minimum input voltage required to maintain 2.8V output at 150mA?

The AP7354D-28W5-7 requires VIN ≥ 2.99V to sustain 2.8V output at 150mA, based on its typical 0.19V dropout voltage. At worst-case 0.40V dropout (max spec), minimum VIN is 3.2V. Operation below these values causes output collapse or regulation loss.

Can the EN pin be left unconnected, or must it be tied high/low?

The EN pin must never float - it must be actively driven high (>1.0V) to enable regulation or low (<0.4V) to enter shutdown. If unused, tie EN directly to VIN to ensure permanent activation; leaving it open risks erratic behavior due to noise coupling and undefined state.

Does the active output discharge function operate when VIN is removed?

No. The discharge switch requires VIN to be present and ≥1.5V to function. When VIN drops below ~1.2V, the internal circuitry loses bias, disabling the discharge path. For full-rail discharge during VIN removal, an external resistor or dedicated load switch is required.

Is the SOT25 package thermally enhanced compared to SOT23 for this device?

Yes. The SOT25 package has θ_JA = 162°C/W versus 170°C/W for SOT23, providing ~5% better thermal performance. Additionally, the dual-GND pins (Pins 2 and 5) reduce thermal resistance and improve heat spreading across the PCB copper area.