Diodes Incorporated AP2156SG-13

Overview

AP2156SG-13 from Diodes Incorporated is a dual-channel, active-high enable, high-side USB power switch with 0.8A current limiting, 90mΩ R_DS(ON) (MSOP-8EP), and integrated short-circuit/thermal protection for hot-swap applications. It operates from 2.7V–5.5V input, delivers ≤0.5A continuous per channel, and features 7ms deglitched open-drain FLG outputs for reliable fault reporting in USB 2.0-compliant hubs and docking stations.

For engineers reviewing the AP2156SG-13 datasheet, AP2156SG-13 pinout, AP2156SG-13 application, or AP2156SG-13 equivalent, this device supports precise current-limited power sequencing in dual-port USB host systems, requires no external components for over-current blanking, and enables robust hot-plug insertion control via controlled 0.6ms rise time and under-voltage lockout at 1.9V.

Technical Context

The AP2156SG-13 integrates two independent high-side N-channel MOSFET switches with matched current-limit thresholds (0.8A typ), UVLO (1.9V trip), and thermal shutdown at +140°C with +25°C hysteresis. Each channel includes reverse-current blocking and dedicated open-drain FLG outputs with internal 7ms deglitch timing to suppress false fault assertions during capacitive load turn-on.

Its functional block employs sense-FET current monitoring instead of external shunts, enabling low-loss operation while maintaining fast short-circuit response (<20µs) and stable current regulation under varying ambient temperatures (–40°C to +85°C). The SO-8 package variant (SG suffix) specifies 100–135mΩ R_DS(ON) across temperature and voltage conditions.

Key Specifications

Pinout & Package

AP2156SG-13 is supplied in an SO-8 package (surface-mount, gull-wing leads) with exposed pad not electrically connected-intended for thermal grounding only. Pin numbering follows standard SO-8 top-view layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel USB power switch applications.

Compared with AP2146SG-13, the AP2156SG-13 eliminates level-shifting requirements for enable signals, simplifying MCU interface design; versus TUSB2036IRHBR, it offers lower cost, smaller footprint, and direct replacement capability in existing switch-only layouts without protocol stack dependencies.

Availability

AP2156SG-13 is available at Aetrix Electronics and suitable for USB host hubs, hot-swap docking stations, and industrial USB peripherals requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AP2156SG-13 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 ICs for power management, signal integrity, and protection applications.

The AP21xx series targets USB and hot-swap power distribution, delivering integrated current limiting, fault reporting, and thermal safety in compact packages for space-constrained consumer and industrial interfaces.

FAQ

What is the maximum continuous load current per channel for AP2156SG-13?

The AP2156SG-13 supports up to 0.5A continuous load current per channel under recommended operating conditions (T_A ≤ +85°C, V_IN = 5V). This limit ensures thermal stability within the SO-8 package's 110°C/W junction-to-ambient thermal resistance and avoids triggering current-limit mode during normal operation.

Does AP2156SG-13 require external components for over-current fault blanking?

No. The AP2156SG-13 incorporates an internal 7ms deglitch timer on both FLG1 and FLG2 outputs, eliminating the need for external RC networks to suppress false fault reports during output capacitor inrush. This is confirmed in the datasheet's "Fault Report (FLG) With Blanking Time" feature and typical performance curves.

Can AP2156SG-13 be used in 3.3V-only systems?

Yes. Its input voltage range (2.7V–5.5V) fully covers 3.3V nominal rails. At V_IN = 3.3V, R_DS(ON) rises to 120–160mΩ, resulting in ≤40mW conduction loss at 0.5A-well within thermal limits for SO-8 with proper PCB copper area. UVLO remains functional at 3.3V operation.

How does the thermal shutdown mechanism behave during sustained overload?

When junction temperature reaches +140°C, the AP2156SG-13 disables both channels and asserts FLG low. After cooling by ~25°C (to ~+115°C), it automatically recovers and re-enables-if the fault persists, it cycles on/off. This hiccup-mode behavior prevents permanent damage while maintaining visibility of the fault condition via FLG status.