Hx8872c Datasheet May 2026

HX8872C — Overview and Key Specifications

Type: Single-chip audio power amplifier (class AB, low-voltage)
Typical use: Portable audio devices, battery-powered speakers, phones, multimedia devices.
Package: Commonly available in SOP-8 or MSOP-8 (check supplier).
Supply voltage (Vcc): Typical range 2.5 V to 5.5 V (verify with specific vendor datasheet)
Output power: Up to ~3 W per channel into 4 Ω at 5 V (single-ended) — actual power depends on supply voltage, load impedance, and THD+N.
Quiescent current: Typically low (tens to hundreds of μA in standby; a few mA in active mode) — refer to datasheet section for exact figures.
Shutdown/Standby pin: Usually provided to reduce power consumption.
Gain: Fixed internally (commonly around 20–30 dB) or set by external resistors depending on variant.
Thermal protection: Integrated thermal shutdown and short-circuit protection.
Pop-and-click suppression: Soft-start and mute functions included on many revisions.
Inputs: Differential or single-ended input pins; input coupling capacitors recommended.
Outputs: BTL (bridge-tied load) outputs for speaker driving, may also support single-ended configurations with external components.
ESD protection: I/O protection on most commercial samples.

The HX8872C is a "workhorse" IC because of its reliability. You will most likely encounter it in: Industrial HMIs: Touchscreen panels on factory machinery. hx8872c datasheet

3. Pinout Highlights (Partial)

| Pin # | Name | Type | Description | |-------|------------|--------|--------------------------------------| | 1 | TP_TXP | O | TP transmit positive (to magnetics) | | 2 | TP_TXN | O | TP transmit negative | | 3 | VDD33 | P | 3.3V power | | 4 | TP_RXP | I | TP receive positive | | 5 | TP_RXN | I | TP receive negative | | 6 | GND | P | Ground | | 9 | FX_SD | I | Fiber signal detect (active low) | | 10 | FX_RD+ | I | Fiber receive data positive (PECL) | | 11 | FX_RD- | I | Fiber receive data negative (PECL) | | 12 | FX_TD+ | O | Fiber transmit data positive (PECL) | | 13 | FX_TD- | O | Fiber transmit data negative (PECL) | | 21 | MODE_SEL0 | I | Mode select bit 0 (pull-up/down) | | 22 | MODE_SEL1 | I | Mode select bit 1 | | 35 | LED_LINK | O | Link status (active low) | | 36 | LED_ACT | O | Activity blink | | 44 | XTAL_IN | I | 25MHz crystal input | | 45 | XTAL_OUT | O | 25MHz crystal output | OSC : Internal oscillator connection (or external clock

  • Low Power: <300mA typical at 3.3V supply.
  • Integrated 1.8V regulator for core (requires external bypass caps).
  • LED Indicators: Link/Act, FDX/COL, Speed (10/100), FX/TX activity.
  • Package: 48-pin LQFP (7×7mm) or 64-pin TQFP (optional).
  • Operating Temperature: 0°C to +70°C (commercial) or -40°C to +85°C (industrial).
  • Support Components: Usually requires a configuration EEPROM (if OTP is not used), voltage regulators (LDOs), and crystal oscillator (if internal clock generation requires an external reference).

    • 9. Application Notes (Critical for Design)

    1. PCB Layout: Keep TP differential pairs (TXP/TXN, RXP/RXN) 100Ω impedance. Fiber PECL traces should be short and matched.
    2. Fiber Signal Detect (FX_SD): Must be driven by fiber transceiver’s SD output; if unused, pull to VDD.
    3. Crystal Loading: Use 25MHz fundamental mode crystal; avoid overtone.
    4. Power Sequencing: No special sequence required; but apply 3.3V before 1.8V internal LDO stabilizes.
    5. Auto MDI/MDI-X: Works only when auto-negotiation is enabled (MODE_SEL=00).

    25MHz to 90MHz (Some variants support 30MHz specialized handling) Supply Voltage (VDD) 2.0V to 5.5V (Standard operating: 3.3V) Standby Current 1.0 to 2.0 μA Package Type TQFP-64 / QFP-64 Thermal Protection Automatic shutdown above 150°C Application & Compatibility Versatility: 9. Application Notes (Critical for Design)