Diodes Incorporated AP2337SA-7

Overview

AP2337SA-7 from Diodes Incorporated is a single-channel, current-limited high-side load switch optimized for hot-swap and capacitive-load applications. It delivers 1.0A continuous output, features 110mΩ R_DS(ON) at 5V, integrates reverse-current blocking, and provides fast 5μs short-circuit response with built-in UVLO, thermal shutdown, and over-voltage protection. It is deployed in USB-powered peripherals and display power rails.

For engineers reviewing the AP2337SA-7 datasheet, AP2337SA-7 pinout, AP2337SA-7 application, or AP2337SA-7 equivalent, key selection criteria include accurate 1.5A current limiting, 2.7–5.5V input range, controlled 4ms turn-on time, reverse-current limit threshold (0.5A typ), and SOT23 package thermal performance under sustained load.

Technical Context

The AP2337SA-7 implements a high-side NMOS power switch with integrated current-sense FET and deglitch logic for fault detection. Its protection architecture combines independent UVLO (2.65V typ), reverse-current comparator (100mV V_OUT–V_IN trip), and output over-voltage sensing (114% VIN trip) with dedicated 15μs debounce timing.

Thermal management uses junction-sensing with 150°C shutdown threshold and 20°C hysteresis, while soft-start is achieved via internal charge-pump control yielding 2.5ms typical turn-on. Discharge functionality employs a dedicated 100Ω internal NMOS path activated during UVLO fall.

Key Specifications

Pinout & Package

AP2337SA-7 is housed in a standard SOT23-3 package (3.0mm × 1.4mm × 1.1mm body, 0.95mm pitch), optimized for thermal dissipation on 2oz copper FR-4 with θ_JA = 180°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current-limited load switch applications.

Compared with TPS22965DSGR and RT9711CGQW, AP2337SA-7 uniquely combines reverse-current blocking, output over-voltage protection, and 5μs short-circuit response in a single SOT23-3 package-making it optimal for USB-compliant, space-constrained hot-swap nodes where comprehensive fault coverage is mandatory.

Availability

AP2337SA-7 is available at Aetrix Electronics and suitable for LCD TV power sequencing, USB peripheral hot-swap, and server board module enablement requiring stable component supply across industrial and consumer production cycles.

Supply support for AP2337SA-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, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP2337 belongs to Diodes' load switch product line, engineered specifically for robust hot-swap and inrush-controlled power delivery in USB, display, and embedded computing systems where fault resilience and small footprint are essential.

FAQ

What is the maximum continuous output current rating for AP2337SA-7?

The AP2337SA-7 is rated for 1.0A continuous output current under recommended operating conditions (TA = –40°C to +85°C, VIN = 2.7V–5.5V). This rating assumes adequate PCB copper area for thermal dissipation (θJA = 180°C/W on 2oz FR-4). Derating applies above 85°C ambient or with higher RDS(ON) at lower input voltages.

Does AP2337SA-7 provide reverse current blocking, and how does it operate?

Yes, AP2337SA-7 provides active reverse current blocking via an internal comparator that triggers when VOUT exceeds VIN by ~100mV. Upon detection, it limits reverse current to 0.5A (typ) and disables the switch after 600μs if the condition persists. Recovery occurs automatically when VOUT drops to 101% of VIN.

Can AP2337SA-7 be used in USB 2.0/3.0 compliant designs?

Yes-AP2337SA-7 meets USB power delivery requirements through its reverse-current blocking, 1.5A current limit, and fast short-circuit response. Its 2.7–5.5V input range covers USB 3.3V and 5V rails, and its 3kV HBM ESD rating supports handling in standard manufacturing environments.

What is the function of the discharge feature, and how is it implemented?

The discharge feature activates when VIN falls below the UVLO threshold (~2.65V), turning on an internal 100Ω NMOS between OUT and GND. This safely bleeds stored charge from output capacitors, preventing floating or unintended re-powering of downstream circuitry. Discharge time depends on C_OUT and the 100Ω path (e.g., 10μF → ~500μs to 300mV).