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Microchip Technology ATA5423-PLQW
- Part No.:
- ATA5423-PLQW
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATA5423-PLQW.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,797
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Product details
Overview
ATA5423-PLQW from Microchip Technology is a highly integrated UHF ASK/FSK multi-channel half-duplex transceiver in a 7 × 7 mm QFN48 package, operating at 312.5–317.5 MHz. It delivers –109.0 dBm FSK sensitivity at 20 kBaud and –116.0 dBm ASK sensitivity at 10 kBaud (433.92 MHz reference), supports 1–20 kBaud Manchester data rates, and integrates fractional-N synthesizer, low-IF signal processing, SPI interface, and 5 push-button inputs - enabling secure remote keyless entry (RKE) systems with fast challenge-response crypto.
For engineers reviewing the ATA5423-PLQW datasheet, ATA5423-PLQW pinout, ATA5423-PLQW application, or ATA5423-PLQW equivalent, this page provides verified technical context on its low-IF architecture, ±2.5 MHz programmable tuning range, RSSI output, integrated XTAL capacitors, and power-down wake-up capability - all critical for automotive RKE, access control, and battery-powered telemetry design.
Technical Context
The ATA5423-PLQW implements a fully integrated low-IF receiver 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 selection across 312.5–317.5 MHz band with 800 Hz RF resolution and tolerates XTAL drift via digital compensation.
In transmit mode, it uses closed-loop FSK modulation with high PLL bandwidth and >55 dB blocking at ±750 kHz, while ASK transmission employs PA switching. The device integrates RX/TX switch, single-ended RF I/O, RSSI amplifier, and SPI-controlled digital logic supporting FIFO-buffered protocol handling - all powered from 2.4–3.6 V or 4.4–6.6 V supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 312.5–317.5 MHz band - matches dedicated RKE sub-GHz ISM allocation for regional compliance and interference resilience. |
| Receiver Sensitivity | –109.0 dBm at 20 kBaud FSK / –116.0 dBm at 10 kBaud ASK (BER = 10⁻³) - enables reliable link budget in compact loop antenna designs. |
| Data Rate Support | 1–20 kBaud Manchester FSK, 1–10 kBaud Manchester ASK - covers standard RKE, alarm, and home automation protocols without reconfiguration. |
| Supply Voltage Range | 2.4–3.6 V or 4.4–6.6 V - supports single-cell Li-ion (2.4–3.6 V) and dual-cell alkaline (4.4–6.6 V) power architectures. |
| Current Consumption | 10.5 mA in RX/TX mode (3 V, 5 dBm TX) - extends battery life in intermittent-use remote controls. |
| IF Frequency | 226 kHz - enables high-selectivity integrated filtering and eliminates image-rejection complexity of direct-conversion receivers. |
| Package | 7 × 7 mm QFN48 - surface-mount compatible with automated assembly; thermal pad supports power dissipation in continuous TX operation. |
Pinout & Package
ATA5423-PLQW is housed in a 7 × 7 mm QFN48 package with exposed thermal pad. Pin functions are validated per Microchip Preliminary Rev. 4841A–RKE–02/05 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN | RF input terminal | Single-ended LNA input; matched to 50 Ω via external LC network for optimal sensitivity at 315 MHz band. |
| RF_OUT | RF output terminal | Single-ended PA output; adjustable 0–10 dBm output power via R_PWR resistor and PWR_H control. |
| R_PWR | Power-setting resistor terminal | Connects external resistor (e.g., 22 kΩ) to set stable output power level independent of supply variation. |
| 433_N868 | Frequency band select | Logic-level input selecting internal RF path configuration for 315/345 MHz (low) vs. 433/868/915 MHz (high) bands. |
| RSSI | Analog received signal strength indicator | DC-coupled voltage output proportional to input RF power - used for automatic gain control or link quality monitoring. |
| SCK/SDI_TMDI/SDO_TMDO/CS | SPI interface signals | Full-duplex serial interface up to 500 kBit/s for register configuration, FIFO read/write, and status polling. |
| T1–T5 | Push-button inputs | Five debounced, wake-up-capable GPIOs active in power-down mode - eliminate need for external wake controller in RKE fobs. |
| N_RESET | Microcontroller reset output | Open-drain reset signal driven by ATA5423-PLQW to synchronize MCU boot after power-on or brownout. |
Key Features
| Feature | Design Value |
|---|---|
| Fractional-N synthesizer with 800 Hz resolution | Enables precise multi-channel hopping and crystal tolerance compensation without external VCO components. |
| Integrated XTAL load capacitors (9 pF) | Reduces BOM count by eliminating two external capacitors; simplifies layout and improves start-up reliability. |
| Low-IF architecture (226 kHz IF) | Achieves 30 dB image rejection and eliminates second-order intermodulation issues common in direct-conversion receivers. |
| Self-polling digital control logic with FIFO RAM | Offloads microcontroller by autonomously handling Manchester encoding, challenge-response timing, and packet buffering. |
| Inductive AUX supply mode | Allows operation with empty battery via VAUX pin - maintains system availability during battery replacement in security-critical applications. |
| ESD protection (2 kV HBM, 200 V MM) | Meets IEC 61000-4-2 Level 3 requirements for handheld RKE devices subjected to frequent human handling. |
Applications
| Remote Keyless Entry (RKE) Fob | Access Control Transmitter |
|---|---|
Use Scenario: Compact handheld fob transmitting encrypted door unlock commands to vehicle receiver within 10–30 m range. IC Role / Device Role / Timing Role: Full transceiver managing RF modulation, protocol framing, button wake-up, and clock/reset generation for 8-bit MCU. Use Value: Enables <100 ms challenge-response crypto exchange using only a 4.5 MHz CLK output and no external SAW filter - reducing PCB size and cost by 30% vs. discrete solutions. |
Use Scenario: Wall-mounted keypad sending arming/disarming codes to central security panel in residential alarm systems. IC Role / Device Role / Timing Role: ASK/FSK transceiver with configurable data rate and RSSI-based signal validation to reject jamming attempts. Use Value: Delivers –116.0 dBm ASK sensitivity at 10 kBaud, allowing reliable operation with low-power loop antennas and extending battery life to >2 years. |
| Energy Meter Telemetry Unit | Home Automation Remote |
Use Scenario: Battery-powered utility meter transmitting consumption data hourly via unidirectional burst transmission. IC Role / Device Role / Timing Role: Low-power transceiver in scheduled TX-only mode with wake-up on timer interrupt and ultra-low RX current (8.4 mA @ –40°C). Use Value: Achieves >10-year battery life using CR2032 cell due to 5 µA deep power-down current and efficient XTO start-up circuit (> –1.5 kΩ impedance). |
Use Scenario: Handheld remote controlling lighting, HVAC, and blinds in smart home environments. IC Role / Device Role / Timing Role: Multi-channel FSK transceiver supporting frequency agility across 315 MHz band to avoid co-location interference. Use Value: Provides ±2.5 MHz programmable tuning range and automatic frequency correction - maintaining link integrity despite crystal aging and temperature drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UHF ASK/FSK transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ATA5780N-PLQW | Higher integration: includes embedded 8051 MCU core and AES crypto engine; operates at 315/434/868/915 MHz bands. | Targeted at full-system SoC designs requiring on-chip crypto acceleration and firmware execution - not pin-compatible. | Select when replacing legacy MCU + transceiver combos with single-chip solution and cryptographic offload is required. |
| SI4432-B1B-FM | Wider frequency range (240–930 MHz); higher TX power (20 dBm); no integrated XTAL caps or push-button inputs. | Requires external crystal load capacitors, MCU wake-up logic, and SAW filtering for RKE-grade blocking performance. | Select for base-station or industrial telemetry where higher output power and broader band coverage outweigh BOM simplicity. |
Compared with ATA5423-PLQW, ATA5780N-PLQW adds embedded processing but increases design complexity and cost, while SI4432-B1B-FM offers wider band flexibility at the expense of external component count and reduced integration for battery-powered remotes.
Availability
ATA5423-PLQW is available at Aetrix Electronics and suitable for remote keyless entry (RKE), access control systems, and energy metering applications requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for ATA5423-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 global semiconductor company specializing in microcontrollers, analog devices, and wireless solutions, with leadership in automotive, industrial, and consumer connectivity ICs.
The ATA5423-PLQW belongs to Microchip's ATA54xx family of highly integrated UHF transceivers designed specifically for secure, low-power, battery-operated remote control and access systems - emphasizing minimal external components and robust RF performance in compact form factors.
FAQ
What is the operating frequency band supported by the ATA5423-PLQW?
The ATA5423-PLQW is optimized for the 312.5–317.5 MHz band, aligning with regional ISM allocations for remote keyless entry and access control. It achieves this through internal band-select logic (433_N868 pin) and fractional-N synthesizer calibration - ensuring stable operation without external VCO or PLL components. This band assignment is fixed per device variant and confirmed in Microchip's ATA5423/25/28/29 preliminary datasheet Rev. 4841A–RKE–02/05.
Does the ATA5423-PLQW require external crystal load capacitors?
No, the ATA5423-PLQW integrates 9 pF load capacitors internally on XTAL1 and XTAL2 pins, eliminating the need for external capacitors in most designs. This reduces BOM count and layout sensitivity while improving oscillator start-up reliability - verified in typical remote control unit reference circuits (Figure 2-1). External capacitors may still be added for fine-tuning if board parasitics exceed design margins.
How does the ATA5423-PLQW handle power management in battery-operated systems?
The ATA5423-PLQW supports multiple low-power modes including deep power-down (5 µA), wake-up via T1–T5 buttons or PWR_ON, and inductive AUX supply mode for operation with depleted batteries. Its supply voltage regulator, reset generation, and clock output (CLK) reduce MCU peripheral requirements - enabling use of low-cost 4-/8-bit microcontrollers in RKE fobs and telemetry units.
Can the ATA5423-PLQW be used with a loop antenna?
Yes, the ATA5423-PLQW's single-ended RF architecture, high isolation between PLL/VCO and PA, and ground-referenced design enable robust loop antenna integration - as demonstrated in Figure 2-1 of the datasheet. Its 226 kHz IF and blocking performance (55 dB at ±750 kHz) eliminate need for bulky SAW filters, making it ideal for space-constrained remote controls with free-form wire loop antennas.
What interfaces does the ATA5423-PLQW provide for microcontroller communication?
The ATA5423-PLQW communicates exclusively via a 4-wire SPI interface (SCK, SDI_TMDI, SDO_TMDO, CS) operating up to 500 kBit/s. It also provides dedicated control signals including CLK (4.5 MHz output), N_RESET (open-drain MCU reset), IRQ (interrupt request), and DEM_OUT (raw demodulated data) - enabling full protocol handling without MCU bit-banging.
ATA5423-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:
- 315MHz
- 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)
ATA5423-PLQW FAQ
1.How can I place an order for ATA5423-PLQW through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5423-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 ATA5423-PLQW reliable?
The price and inventory of ATA5423-PLQW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5423-PLQW is usually 5 days.
3.What payment methods are accepted for ATA5423-PLQW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5423-PLQW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5423-PLQW?
ATA5423-PLQW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5423-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 ATA5423-PLQW?
For technical support, including ATA5423-PLQW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5423-PLQW requirements.
6.How does Aetrix verify that ATA5423-PLQW is sourced from the original manufacturer or authorized distributors?
All ATA5423-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 ATA5423-PLQW meets industry standards.
7.What is the process for return or replacement of ATA5423-PLQW?
All ATA5423-PLQW units undergo pre-shipment inspection (PSI). If there is an issue with ATA5423-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 ATA5423-PLQW part is unused and in its original packaging.
Return procedure for ATA5423-PLQW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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