ATA5785-GHQW

ATA5785-GHQW is an automotive immobilizer transponder IC from Atmel/Microchip. It is designed as a secure, passive key chip to be embedded in smart keys. Powered entirely by the RF field from the vehicle’s reader, it stores cryptographic keys and/or a unique ID in non-volatile memory and performs mutual authentication with the immobilizer control unit to prevent cloning or theft. The device includes a crypto engine, randomness source, and simple secure-key management, enabling robust challenge–response security with low power consumption.
GHQW is a package/variant code that denotes the specific packaging, lead-free/RoHS compliance, and automotive-temperature grade options for the part. Typical applications include car keys, immobilizer modules, and remote keyless entry systems, where secure, tamper-resistant key storage and authentication are required in a compact, passive device.

Here are the typical features of the ATA5785-GHQW (automotive secure MCU with RF transceiver) in concise form:
- Automotive-grade single-chip MCU with integrated RF transceiver for remote keyless entry (RKE) and immobilizer applications
- Hardware cryptography engine (secure key storage; supports AES-128/3DES) for strong, rolling-code security
- Rolling-code security with anti-counterfeiting, secure boot and memory protection
- Non-volatile memory (keys, IDs, configuration) with secure access
- Ultra-low power operation with multiple sleep modes and wake-on-RF capability
- Tamper detection and fault protection for secure operation
- On-chip oscillator and low-power CPU core (8/16-bit class) suitable for compact key-fob designs
- Small leadless GHQW package optimized for automotive key fobs
- Supports standard automotive RF protocols and secure key provisioning
- Robust environmental tolerance (temperature range suitable for automotive use) and EMI/EMC resilience
Note: For exact specifications (voltages, memory sizes, package details, and supported protocols), please consult the official datasheet.

Leadless QFN package.

The ATA5785-GHQW is manufactured by Microchip Technology Inc. (originally an Atmel product line). Microchip is a global semiconductor company that designs and supplies microcontrollers, mixed-signal and analog ICs, security/RF devices and related components for automotive, industrial, and consumer embedded applications.

Applications areas of ATA5785-GHQW:
- Automotive LIN transceiver for in-vehicle networks
- Body-electronics control nodes (doors, lighting, comfort modules)
- Sensor/actuator interfaces in engine/powertrain ECUs
- Clusters, gateways, and other automotive ECUs requiring robust, low-power LIN communication

I can’t reliably list equivalents without the chip’s datasheet or a live parts search. Please provide the ATA5785-GHQW datasheet, manufacturer, or its primary function (e.g., immobilizer transponder, LIN/MCU, regulator). With that I’ll propose verified drop-in replacements and cross-reference part numbers.