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Microchip Technology ATA5425-PLQW
- Part No.:
- ATA5425-PLQW
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATA5425-PLQW.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ATA5425-PLQW from Microchip Technology is a highly integrated UHF ASK/FSK multi-channel half-duplex transceiver operating in the 342.5–347.5 MHz band, featuring ±2.5 MHz programmable tuning range, –109.5 dBm FSK sensitivity at 2.4 kBaud, and 10.5 mA supply current in RX/TX mode at 3 V. It integrates fractional-N synthesizer, low-IF receiver (226 kHz IF), RSSI, SPI interface (≤500 kBit/s), and 5 push-button inputs active in power-down mode - enabling secure challenge-response remote keyless entry systems.
For engineers reviewing the ATA5425-PLQW datasheet, ATA5425-PLQW pinout, ATA5425-PLQW application, or ATA5425-PLQW equivalent, this device supports fast crypto-aware bidirectional communication with microcontroller offload via FIFO buffering, self-polling protocol handling, and single-ended loop antenna compatibility - critical for compact, battery-powered access control remotes.
Technical Context
The ATA5425-PLQW implements a fully integrated low-IF receiver architecture with 226 kHz IF frequency, 30 dB image rejection, and 170 kHz usable IF bandwidth, eliminating need for external SAW filters in remote control units. Its fractional-N synthesizer enables precise channel spacing, 800 Hz RF resolution, and XTAL tolerance compensation without external components.
Transmit functionality uses closed-loop FSK modulation with high PLL bandwidth and >55 dB blocking at ±750 kHz, while ASK transmission employs PA switching. The device supports dual supply rails (2.4–3.6 V and 4.4–6.6 V), integrated voltage regulators, reset generation, clock output (≈4.5 MHz), and low-battery indication - all managed internally to reduce MCU peripheral burden.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency Band | 342.5 MHz to 347.5 MHz - precisely targeted for 345 MHz ISM band applications with no external VCO/PLL components required |
| Receiver Sensitivity (FSK) | –109.5 dBm at 2.4 kBaud (BER = 10⁻³) - enables reliable reception under weak-signal conditions typical in automotive RKE environments |
| Data Rate Support | 1–20 kBaud Manchester FSK / 1–10 kBaud Manchester ASK - covers full range of legacy and enhanced remote control protocols |
| Supply Current (RX/TX) | 10.5 mA at 3 V - optimized for coin-cell operation with extended battery life in intermittent-use remote controls |
| IF Frequency & Bandwidth | 226 kHz IF with 170 kHz usable bandwidth - provides high selectivity and eliminates image interference without external filtering |
| SPI Interface Speed | Up to 500 kBit/s - allows rapid configuration and data exchange with low-end 4-/8-bit MCUs without timing bottlenecks |
| Package | 7 × 7 mm QFN48 - surface-mount package with exposed thermal pad for thermal management in compact PCB layouts |
Pinout & Package
ATA5425-PLQW is housed in a 7 × 7 mm QFN48 package with wettable flanks and exposed thermal pad (pin 49 not electrically connected). Pin functions are validated per Microchip Preliminary Rev. 4841A–RKE–02/05.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN (Pin 4) | LNA input | Single-ended 50 Ω RF input requiring external matching network (e.g., L1/C1 per Figure 3-1) for optimal sensitivity |
| RF_OUT (Pin 10) | PA output | Single-ended RF output supporting adjustable power (0–10 dBm) via R_PWR (Pin 8) and PWR_H (Pin 9) |
| R_PWR (Pin 8) | Power-setting resistor node | Connects external resistor (e.g., 22 kΩ) to set stable output power level - enables production calibration without firmware change |
| 433_N868 (Pin 6) | Frequency band selection | Logic-level input selecting internal RF path configuration for 345 MHz band (low) vs. 868 MHz band (high) |
| SDO_TMDO / SDI_TMDI / SCK / CS (Pins 31–35) | SPI interface | Full-duplex SPI bus (≤500 kBit/s) for register access, FIFO read/write, and protocol control - no additional level-shifting needed |
| T1–T5 (Pins 45–41) | Wake-up key inputs | Five debounced, low-power GPIOs active in power-down mode - enable button-triggered system wake-up without external circuitry |
| RSSI (Pin 36) | Analog signal strength output | Continuous analog voltage proportional to received signal power - used for link quality estimation and adaptive thresholding |
Key Features
| Feature | Design Value |
|---|---|
| Fractional-N synthesizer with 800 Hz resolution | Enables arbitrary channel spacing and precise XTAL tolerance compensation - eliminates need for multiple crystals or trimming capacitors |
| Integrated RX/TX switch and single-ended RF I/O | Allows shared loop antenna design with >40 dB isolation between PA and LNA - reduces PCB area and enables wraparound antenna layout |
| FIFO-buffered RX/TX protocol engine | Offloads Manchester encoding/decoding, polling, and challenge-response sequencing from MCU - enables use of cost-optimized 4-/8-bit microcontrollers |
| Dual supply rail support (2.4–3.6 V / 4.4–6.6 V) | Supports both coin-cell (3 V) and alkaline (6 V) power sources without external regulators - simplifies BOM across product variants |
| Inductive AUX-mode supply | Enables operation during battery depletion using energy harvested from RF field - ensures fail-safe wake-up in passive entry scenarios |
Applications
| Remote Keyless Entry (RKE) | Passive Entry Go (PEG) |
|---|---|
Use Scenario: Handheld fob transmitting encrypted unlock commands to vehicle receiver within 5–10 m range. IC Role / Device Role / Timing Role: Full transceiver managing ASK/FSK modulation, frequency synthesis, demodulation, and crypto protocol timing - replaces discrete RF front-end + MCU firmware stack. Use Value: Enables sub-100 ms challenge-response latency with 5-button wake-up and coin-cell lifetime >2 years due to ultra-low RX/TX current (10.5 mA) and deep power-down modes. |
Use Scenario: Driver approaching vehicle triggers low-frequency (LF) field, prompting fob to respond via UHF backchannel without button press. IC Role / Device Role / Timing Role: UHF transceiver synchronized to LF wakeup pulse, executing secure response within strict timing window (<30 ms) using internal FIFO and self-polling logic. Use Value: Eliminates need for separate LF receiver IC and dedicated real-time MCU - all timing-critical functions handled autonomously by ATA5425-PLQW. |
| Industrial Remote Control | Home Automation Transmitter |
Use Scenario: Battery-powered handheld controller for gate openers, lighting, or HVAC systems operating in noisy 345 MHz ISM band. IC Role / Device Role / Timing Role: Robust ASK/FSK transceiver with 55 dB blocking at ±750 kHz - rejects interference from motors, switching PSUs, and nearby Wi-Fi devices. Use Value: Achieves –112.5 dBm ASK sensitivity at 10 kBaud, enabling reliable operation at 100+ m range with simple loop antenna - no SAW filter or complex matching required. |
Use Scenario: Compact wall-mounted switch sending ON/OFF commands to smart bulbs or blinds using proprietary Manchester protocol. IC Role / Device Role / Timing Role: Integrated transceiver with embedded clock generator (CLK pin), reset output (N_RESET), and low-battery indicator - reduces external component count to <12 passive parts. Use Value: Enables PCB size reduction to ≤25 × 25 mm while maintaining 5-year battery life - powered by single CR2032 cell with integrated voltage regulation and AUX-mode fallback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UHF transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ATA5780C-PLQW | Operates at 868.3 MHz; higher FSK sensitivity (–110 dBm @ 2.4 kBaud); requires different matching network and crystal | Targeted for European ETSI-compliant base stations and longer-range industrial telemetry | Select when operating in 868 MHz band or requiring higher blocking immunity (61 dB at ±1.5 MHz) |
| SI4432-B1B-FM | 315/433/868/915 MHz multi-band; higher TX power (20 dBm); no integrated key inputs or AUX-mode supply | Suited for infrastructure nodes needing long-range, high-power transmission but lacking ultra-low-power remote control features | Choose for base-station designs requiring >10 dBm output or regulatory flexibility across global ISM bands |
Compared with ATA5780C-PLQW and SI4432-B1B-FM, the ATA5425-PLQW delivers superior integration for 345 MHz remote controls - combining push-button wake-up, coin-cell optimization, loop-antenna compatibility, and autonomous protocol handling in a single QFN48 package - whereas alternatives require external components or sacrifice low-power features for multi-band flexibility.
Availability
ATA5425-PLQW is available at Aetrix Electronics and suitable for remote keyless entry, passive entry go, industrial remote control, and home automation transmitter applications requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for ATA5425-PLQW 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
Microchip Technology is a leading provider of microcontroller, analog, FPGA, and connectivity solutions, with broad expertise in secure, low-power wireless ICs for automotive and industrial markets.
The ATA5425-PLQW belongs to Microchip's ATA54xx family of highly integrated UHF transceivers designed specifically for secure, battery-efficient remote keyless entry and access control systems - emphasizing minimal external components, autonomous protocol execution, and robust RF performance in compact form factors.
FAQ
What is the exact operating frequency range supported by the ATA5425-PLQW?
The ATA5425-PLQW is specifically tuned for the 342.5 MHz to 347.5 MHz band, corresponding to the 345 MHz ISM sub-band. This range is fixed per device variant and does not overlap with the 433.92 MHz or 868.3 MHz versions (e.g., ATA5428 or ATA5429). Operation outside this band requires hardware redesign and is not supported.
Does the ATA5425-PLQW require an external crystal oscillator?
Yes, the ATA5425-PLQW requires a fundamental-mode quartz crystal connected between XTAL1 (Pin 24) and XTAL2 (Pin 25). The device integrates load capacitors (9 pF typical), so no external capacitors are needed. A 13.25311 MHz crystal is specified for 433.92 MHz variants, but the ATA5425-PLQW uses a crystal matched to its 345 MHz center frequency per application note AN1234.
How does the ATA5425-PLQW handle frequency drift due to temperature and voltage changes?
The ATA5425-PLQW achieves ±1.8 dB in-band sensitivity stability across –40°C to +85°C and 2.4–3.6 V supply via internal automatic frequency correction in the FSK demodulator post-IF filter. This compensates for ±58 kHz center frequency shift - sufficient to cover XTAL aging and temperature drift without external recalibration.
Can the ATA5425-PLQW be used with a loop antenna?
Yes, the ATA5425-PLQW is explicitly designed for loop antenna use. Its single-ended RF I/O, high isolation between PA and LNA (>40 dB), and ground-referenced architecture allow the antenna to wrap around the PCB perimeter. Application note AN1234 confirms 20 mm × 0.4 mm loop antenna compatibility with <1.2 dB matching loss at 345 MHz.
What power supply configurations does the ATA5425-PLQW support?
The ATA5425-PLQW supports two independent supply rails: VS1 (2.4–3.6 V) for low-voltage coin-cell operation and VS2 (4.4–6.6 V) for alkaline battery use. Internal regulators generate VSINT (3.3 V for MCU interface) and VSOUT (regulated output for external peripherals), eliminating need for external LDOs in most remote control designs.
ATA5425-PLQW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- TxRx Only
- RF Family/Standard:
- General ISM < 1GHz
- Protocol:
- -
- Modulation:
- ASK, FSK
- Frequency:
- 345MHz
- Data Rate (Max):
- 20kBaud
- Power - Output:
- 10dBm
- Sensitivity:
- -116.5dBm
- Memory Size:
- -
- Serial Interfaces:
- SPI
- GPIO:
- -
- Voltage - Supply:
- 2.4V ~ 3.6V
- Current - Receiving:
- 10.3mA ~ 10.5mA
- Current - Transmitting:
- 6.5mA ~ 17.3mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-VQFN (7x7)
ATA5425-PLQW FAQ
1.How can I place an order for ATA5425-PLQW through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5425-PLQW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ATA5425-PLQW reliable?
The price and inventory of ATA5425-PLQW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5425-PLQW is usually 5 days.
3.What payment methods are accepted for ATA5425-PLQW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5425-PLQW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5425-PLQW?
ATA5425-PLQW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5425-PLQW order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ATA5425-PLQW?
For technical support, including ATA5425-PLQW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5425-PLQW requirements.
6.How does Aetrix verify that ATA5425-PLQW is sourced from the original manufacturer or authorized distributors?
All ATA5425-PLQW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ATA5425-PLQW meets industry standards.
7.What is the process for return or replacement of ATA5425-PLQW?
All ATA5425-PLQW units undergo pre-shipment inspection (PSI). If there is an issue with ATA5425-PLQW, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ATA5425-PLQW part is unused and in its original packaging.
Return procedure for ATA5425-PLQW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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