Highway09a Ic Datasheet High Quality -

The "HIGHWAY09A" is an integrated circuit (IC) primarily used in LED lighting control, specifically as a linear constant-current LED driver. While a full PDF datasheet is often found on specialty electronics vendor sites, Key Specifications & Features

Function: High-voltage linear constant-current LED driver IC.

No Magnetics: Operates without the need for electrolytic capacitors or inductors, which simplifies PCB design and reduces overall cost.

Constant Current Control: Features built-in high-precision constant current control to ensure stable brightness across LEDs.

Over-Temperature Protection: Includes an internal thermal regulation loop that reduces the output current if the temperature gets too high, protecting the life of the LEDs. highway09a ic datasheet

PF & THD: Typically designed to meet high Power Factor (PF) and low Total Harmonic Distortion (THD) requirements for lighting standards. Typical Pin Configuration L (Line): Input AC line voltage. OUT: Output current port connected to the LED string.

REXT: External resistor port used to set the desired output current. GND: System ground. Applications

This IC is widely used in compact, low-cost LED lighting solutions such as: LED light bulbs (A19, GU10) LED downlights and ceiling lamps LED filament bulbs Small-form-factor LED modules

If you are looking to purchase these or similar components, retailers like AliExpress often carry them in bulk for DIY electronics or repair projects. 10pcs/lot SN74LS09N 74LS09 DIP14 new - AliExpress 502 The "HIGHWAY09A" is an integrated circuit (IC) primarily

This is a tricky request because “highway09a ic” does not match any standard or major commercial IC (from brands like Texas Instruments, Analog Devices, Maxim, NXP, STMicroelectronics, etc.).

It is highly likely one of the following:

1. A misremembered or misread part number – Common misreads of similar-looking codes:

   • LM2904 (dual op-amp)
   • LM339A (quad comparator)
   • HA17393 (Hitachi dual comparator)
   • MC34063A (DC-DC converter)
   • Highway is almost certainly not an IC brand; it might be a PCB module or a Chinese generic marking.

2. A Chinese/generic IC with a non-standard or in-house marking – Many small ICs from Alibaba/eBay have markings like HIGHWAY09A that are not official datasheet part numbers. These are often remarketed op-amps, regulators, or driver ICs. A misremembered or misread part number – Common

3. A mis-labeled automotive or industrial module – Sometimes “Highway” appears in product names (e.g., “Highway 09A data acquisition board”), not a bare IC.

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10. PCB Layout & Thermal Considerations

• Place decoupling caps within 2–3 mm of VCC pin
• Keep differential bus traces matched in length and closely coupled
• Use thermal vias under DFN packages for heat dissipation
• Keep high-current paths short and wide

7. Comparison with Alternatives

| IC | I²C addr | PWM | Interrupt | Constant current | |----|----------|-----|-----------|------------------| | AW9523B | 0x58 | Yes (256-step) | Yes | Yes (25mA) | | MCP23017 | 0x20 | No | Yes | No | | PCA9685 | 0x40 | Yes (12-bit) | No | No (open-drain) | | TCA6416 | 0x21 | No | Yes | No |

The AW9523B’s main advantage is LED drive without current-limiting resistors, saving PCB space and BOM cost.

8. Timing Diagrams & Signals

• TXD to bus dominant timing
• Bus to RXD receive timing
• Wake-up sequence from STB pin (Include manufacturer-provided timing diagrams in final documentation.)

Circuit Description

• Connect the shunt resistor between the load and ground.
• Connect IN A+ to the high side of the shunt (load side).
• Connect IN A– to the low side of the shunt (ground side) via R2.
• R1 and R3 set the gain: Gain = R3 / R1 (e.g., R3=100k, R1=10k → Gain=10).
• Output = (I_load × Rsense) × Gain.

6. Recommended Operating Conditions

| Parameter | Min | Typ | Max | Unit | |------------------------|------|-----|------|------| | Supply voltage (V+ to V–) | 2.7 | 12 | 36 | V | | Ambient temperature | –40 | 25 | 125 | °C |