Diodes Incorporated AP9211SA-AI-HAC-7

Overview

AP9211SA-AI-HAC-7 from Diodes Incorporated is a single-chip Li+ battery protection IC integrating dual N-channel MOSFETs (common-drain configuration) in a U-DFN2030-6 (Type C) package. It delivers overcharge (4.375 V ±25 mV), overdischarge (2.500 V ±35 mV), discharge/charge overcurrent (±15 mV accuracy), and short-circuit (0.700 V ±100 mV) protection for 1-cell lithium-ion packs, with fixed 8.0 V overvoltage charger detection and selectable 0V charge permission.

For engineers reviewing the AP9211SA-AI-HAC-7 datasheet, AP9211SA-AI-HAC-7 pinout, AP9211SA-AI-HAC-7 application, or AP9211SA-AI-HAC-7 equivalent, key selection criteria include integrated MOSFET R_SS(ON) (27 mΩ typ. @ 4.0 V), ultra-low quiescent current (3.0 µA typ. in normal mode), programmable protection thresholds, and power-down vs. auto-wake-up mode selection - critical for portable medical devices, power tools, and Bluetooth headsets requiring reliable cell-level safety.

Technical Context

The AP9211SA-AI-HAC-7 implements independent voltage monitoring paths for VDD–VSS (cell voltage) and VM–VSS (current-sense differential), with dedicated comparators and precision delay timers (±20% accuracy at +25°C) for each protection event. Its logic circuit controls gate drive to two internal N-MOSFETs using level-shifted signals to ensure proper turn-on/turn-off sequencing during charge/discharge transitions.

It features factory-configurable options: "SA" denotes auto-wake-up mode (enabling recovery from overdischarge without external charging), "AI" specifies 0V battery charge permission, and "HAC" confirms U-DFN2030-6 (Type C) packaging with thermal EP pad. The device operates across –40°C to +85°C and supports reverse-polarity protection via external R1/R2 current-limit resistors.

Key Specifications

Pinout & Package

U-DFN2030-6 (Type C) package with 0.5 mm pitch, 2.0 mm × 3.0 mm footprint, and exposed thermal pad (EP) connected to common drain of internal MOSFETs. Requires solder mask defined pad and thermal vias for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1-cell Li+ battery protection applications.

Compared with R5460N255AA-TR and SE9011B-0000, the AP9211SA-AI-HAC-7 delivers lower system-level cost through monolithic integration, superior thermal performance via optimized N-MOSFET topology, and enhanced safety with dual-layer overvoltage charger monitoring - making it optimal for industrial and medical-grade battery packs.

Availability

AP9211SA-AI-HAC-7 is available at Aetrix Electronics and suitable for power tool battery packs, wireless headset battery modules, and portable medical monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for AP9211SA-AI-HAC-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 ISO 9001 and IATF 16949 certified manufacturing facilities.

The AP9211 belongs to Diodes' battery protection IC product line, engineered specifically for high-reliability, space-constrained 1-cell Li+ applications in portable industrial and medical equipment - emphasizing integration, accuracy, and ultra-low power consumption.

FAQ

What is the function of the NC pin (Pin 4) on the AP9211SA-AI-HAC-7?

Pin 4 is designated NC (No Connect) and has no internal connection. It must remain unconnected and floating in the PCB layout. Soldering or routing to this pin may cause unpredictable behavior or latch-up due to parasitic coupling. Diodes Incorporated explicitly states this pin serves no electrical function and should be left open.

How does the auto-wake-up mode (SA variant) differ from standard power-down mode?

The SA variant enables automatic exit from overdischarge state when battery voltage rises above VDU (2.900 V) and remains there for tDLR (overdischarge release delay). Unlike power-down mode - which requires external charger connection to wake - auto-wake-up maintains internal biasing to monitor VDD continuously, drawing 3.5–5.5 µA in wake mode versus ≤0.1 µA in true power-down.

Can the AP9211SA-AI-HAC-7 support bidirectional current sensing for both charge and discharge?

Yes - the VM pin senses voltage differential between itself and VSS, enabling detection of both charge overcurrent (negative VM–VSS voltage ≥ |–0.150 V|) and discharge overcurrent (positive VM–VSS voltage ≥ +0.150 V). Internal logic independently triggers S2 (charge FET) or S1 (discharge FET) shutdown based on polarity and magnitude of the VM signal.

What is the maximum continuous discharge current supported by the internal MOSFETs?

At TA = +25°C, the AP9211SA-AI-HAC-7 supports 9.0 A continuous drain current with VGS = 4.5 V. At +70°C, derating applies: maximum continuous current drops to 7.1 A. Thermal performance depends on PCB copper area under the EP pad; Diodes recommends ≥200 mm² of 2-oz copper with ≥4 thermal vias for sustained 7 A operation.