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Home > Products > RF and Wireless > RF Transceiver ICs

Microchip Technology ATA5823-PLQW 80

Name: ATA5823-PLQW 80
Brand: Microchip Technology
SKU: ATA5823-PLQW 80
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ATA5823-PLQW 80

Manufacturer:: Microchip Technology

Category:: RF Transceiver ICs

Package:: 48-VFQFN Exposed Pad

Datasheet:: ATA5823-PLQW 80.pdf

Description:: IC RF TXRX ISM<1GHZ 48VQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ATA5823-PLQW 80 from Microchip Technology is a highly integrated UHF ASK/FSK transceiver for automotive passive entry go (PEG) and remote keyless entry (RKE) systems, operating at 313–316 MHz with full-duplex capability, –111.5 dBm ASK sensitivity at 10 kbit/s, 10.5 mA supply current in RX/TX mode, and 7 mm × 7 mm QFN48 package.

For engineers reviewing the ATA5823-PLQW 80 datasheet, ATA5823-PLQW 80 pinout, ATA5823-PLQW 80 application, or ATA5823-PLQW 80 equivalent, this page delivers verified technical context, validated pin functions, real-world full-duplex PEG system integration details, SPI interface timing constraints, and confirmed alternatives for RKE/TPM coexistence designs.

Technical Context

The ATA5823-PLQW 80 implements a low-IF receiver architecture with 226 kHz IF, 30 dB image rejection, and 220 kHz system bandwidth to support TPM transmitters (e.g., ATA5756/ATA5757) using standard crystals. Its fractional-N synthesizer enables multi-channel operation with arbitrary channel spacing and compensates XTAL tolerances to ±800 Hz RF resolution.

Full-duplex operation eliminates relay attacks by requiring simultaneous receive/transmit on the same frequency, while integrated RX/TX switch, single-ended RF I/O, RSSI, and configurable self-polling with FIFO buffering enable autonomous challenge-response protocol handling without high-performance MCU intervention.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Frequency	313–316 MHz band - matches ATA5823 variant specification per datasheet section 1 and Figure 1-1.
ASK Sensitivity	–111.5 dBm at 10 kbit/s (433.92 MHz), –116 dBm at 2.4 kbit/s - confirmed for 100% ASK modulation, carrier level 433.92 MHz; applies to ATA5823 family per Table 7-4.
FSK Sensitivity	–105.5 dBm at 20 kbit/s (433.92 MHz), –109 dBm at 2.4 kbit/s - measured at BER = 10⁻³, Manchester coding; valid across ATA5823/ATA5824 family per Table 7-3.
Supply Current	10.5 mA in combined RX/TX mode at 3 V, 433.92 MHz, 5 dBm output - specifies real power budget for key fob battery life calculation.
Data Rate	1–20 kbit/s Manchester FSK, 1–10 kbit/s Manchester ASK - supports transparent mode for PWM/pulse-position coding per section 7.
Output Power Range	0 to 10 dBm, adjustable in 0.5 dB steps via internal resistor or external R_PWR - enables precise TX power tuning for regulatory compliance and range optimization.
Package	7 mm × 7 mm QFN48 - small footprint suitable for space-constrained key fobs; exposed die pad for thermal management.
Temperature Range	–40°C to +105°C - qualified for under-hood and interior automotive environments per section 1 and Table 7-3.

Pinout & Package

ATA5823-PLQW 80 is supplied in a 7 mm × 7 mm QFN48 package with exposed thermal pad (GND). Pin functions are validated per datasheet Table 2-1 and Figure 2-1, including critical RF, control, and interface signals.

Pin/Terminal	Circuit Role	Design Meaning
RF_IN	RF input terminal	Connects to LNA input; impedance matched to ~925 Ω // 2.1 pF at 433.92 MHz per Table 7-1 - requires external matching network for 50 Ω antenna interface.
RF_OUT	RF output terminal	Drives PA output; supports loop or PCB antenna; isolation from RF_IN critical in full-duplex PEG mode per Figure 5-1.
433_N868	Frequency band select	Logic-level input selecting 313–316 MHz (ATA5823) vs. 433–435/867–870 MHz (ATA5824) - defines device variant identity per section 1.
R_PWR	External power adjust	Resistor-connected pin setting output power (e.g., 22 kΩ → ~5.5 dBm); used with PWR_H to select internal/external adjustment path.
SETPWR	Internal programmable resistor	Configurable via register to fine-tune output power in 0.5 dB steps - enables software-defined TX power without BOM change.
SPI Interface (CS/SCK/SDI_TMDI/SDO_TMDO)	Digital control interface	500 kbit/s max clock rate; supports full-duplex protocol handling and FIFO buffering - offloads microcontroller in PEG/RKE challenge-response cycles.
RSSI	Received signal strength indicator	Analog voltage output proportional to signal amplitude - enables adaptive gain control and link quality monitoring in real time.
CLK	Microcontroller clock output	~4.5 MHz clock delivered to MCU - eliminates need for external crystal oscillator in low-cost 4-/8-bit MCU designs per section 1.

Key Features

Feature	Design Value
Full-duplex operation mode	Prevents relay attacks in PEG systems by requiring simultaneous bidirectional communication on identical frequency - no duplex offset needed per Feature list.
Low-IF receiver architecture	226 kHz IF with 30 dB image rejection and 220 kHz bandwidth - enables SAW-free key fob design while maintaining blocking performance (55.5 dBC @ ±750 kHz).
Fractional-N synthesizer	Compensates XTAL tolerance to ±800 Hz RF resolution and supports multi-channel arbitrary spacing - eliminates need for multiple crystals or external VCO components.
Integrated RX/TX switch & single-ended I/O	Enables loop antenna placement surrounding entire PCB - reduces antenna Q-factor tolerance burden and improves efficiency in compact key fobs per Figure 3-1.
Self-polling with FIFO-RAM buffering	Handles physical layer protocol autonomously - frees MCU to execute crypto algorithms and logical message composition within <100 ms PEG response window.
Power-down current & wake-up inputs	<10 nA typical shutdown current with two active-low wake-up pins (PWR_ON, N_PWR_ON) - extends lithium coin-cell lifetime in always-listening key fobs.

Applications

Automotive Passive Entry Go (PEG)	Tire Pressure Monitoring Systems (TPMS)
Use Scenario: Key fob communicates bidirectionally with vehicle ECU to authenticate user presence without button press, resisting relay attacks. IC Role / Device Role / Timing Role: Full-duplex transceiver performing synchronized RX/TX at 315 MHz, managing challenge-response crypto handshake via integrated FIFO and self-polling logic. Use Value: Eliminates need for external SAW filter and dual-crystal setup; enables robust loop antenna integration with >28 dB RF_IN/RF_OUT isolation per Figure 5-1.	Use Scenario: Vehicle-side receiver captures tire sensor telemetry (pressure, temperature) transmitted at 433.92 MHz using ATA5757/ATA5756 transmitters. IC Role / Device Role / Timing Role: Multi-channel ASK/FSK receiver with 226 kHz IF bandwidth and fractional-N synthesizer supporting crystal-tolerant TPM coexistence. Use Value: Achieves –106 dBm sensitivity at 433.92 MHz with ±75 kHz frequency offset tolerance - accommodates worst-case ±52.2 kHz transmitter drift per section 7.5.
Remote Keyless Entry (RKE)	Home Automation Wireless Control
Use Scenario: User presses button to lock/unlock doors; system verifies command integrity and executes actuation within strict latency budget. IC Role / Device Role / Timing Role: Half-duplex transceiver operating at 313–316 MHz with 1–20 kbit/s FSK/ASK data rates, SPI-controlled protocol engine and RSSI-based link margin assessment. Use Value: Reduces MCU requirements to 4-/8-bit class with 4.5 MHz CLK output; supports 5 dBm TX power with <10.5 mA supply current for extended battery life.	Use Scenario: Wireless wall switch or sensor node controls lighting, HVAC, or security systems using sub-GHz ISM band communication. IC Role / Device Role / Timing Role: Low-power ASK/FSK transceiver with 2.15–3.6 V / 4.4–5.25 V dual-supply support and –116 dBm ASK sensitivity enabling long-range indoor operation. Use Value: Delivers <10 nA power-down current and push-button wake-up (N_PWR_ON) - ideal for energy-harvesting or coin-cell-powered smart home endpoints.

Automotive Passive Entry Go (PEG)

Tire Pressure Monitoring Systems (TPMS)

Use Scenario: Key fob communicates bidirectionally with vehicle ECU to authenticate user presence without button press, resisting relay attacks.

IC Role / Device Role / Timing Role: Full-duplex transceiver performing synchronized RX/TX at 315 MHz, managing challenge-response crypto handshake via integrated FIFO and self-polling logic.

Use Value: Eliminates need for external SAW filter and dual-crystal setup; enables robust loop antenna integration with >28 dB RF_IN/RF_OUT isolation per Figure 5-1.

Use Scenario: Vehicle-side receiver captures tire sensor telemetry (pressure, temperature) transmitted at 433.92 MHz using ATA5757/ATA5756 transmitters.

IC Role / Device Role / Timing Role: Multi-channel ASK/FSK receiver with 226 kHz IF bandwidth and fractional-N synthesizer supporting crystal-tolerant TPM coexistence.

Use Value: Achieves –106 dBm sensitivity at 433.92 MHz with ±75 kHz frequency offset tolerance - accommodates worst-case ±52.2 kHz transmitter drift per section 7.5.

Remote Keyless Entry (RKE)

Home Automation Wireless Control

Use Scenario: User presses button to lock/unlock doors; system verifies command integrity and executes actuation within strict latency budget.

IC Role / Device Role / Timing Role: Half-duplex transceiver operating at 313–316 MHz with 1–20 kbit/s FSK/ASK data rates, SPI-controlled protocol engine and RSSI-based link margin assessment.

Use Value: Reduces MCU requirements to 4-/8-bit class with 4.5 MHz CLK output; supports 5 dBm TX power with <10.5 mA supply current for extended battery life.

Use Scenario: Wireless wall switch or sensor node controls lighting, HVAC, or security systems using sub-GHz ISM band communication.

IC Role / Device Role / Timing Role: Low-power ASK/FSK transceiver with 2.15–3.6 V / 4.4–5.25 V dual-supply support and –116 dBm ASK sensitivity enabling long-range indoor operation.

Use Value: Delivers <10 nA power-down current and push-button wake-up (N_PWR_ON) - ideal for energy-harvesting or coin-cell-powered smart home endpoints.

Equivalent & Alternatives

The following parts are listed as comparable options for similar UHF transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ATA5824-PLQW 80	Same QFN48 package and architecture but supports 433–435 MHz and 867–870 MHz bands - not 313–316 MHz; lacks 315 MHz calibration data.	Targeted for European 868 MHz RKE/PEG and North American 433 MHz systems - incompatible with 315 MHz legacy TPM or US RKE infrastructure.	Select only if migrating to 433/868 MHz bands; requires antenna redesign and crystal replacement.
SI4463-B1B-FMR	Sub-GHz transceiver with +20 dBm output, 127 dB link budget, and integrated DC-DC converter - no full-duplex mode or built-in PEG protocol logic.	Designed for long-range IoT mesh networks (e.g., Smart Metering), not automotive-grade secure access - lacks relay-attack mitigation features.	Choose when range >1 km or battery life >10 years is required; adds MCU firmware complexity for PEG authentication.

Compared with ATA5824-PLQW 80 and SI4463-B1B-FMR, the ATA5823-PLQW 80 uniquely combines 315 MHz band support, hardware-accelerated full-duplex PEG protocol handling, and SAW-free key fob integration - making it irreplaceable for cost-sensitive, security-critical automotive access systems.

Availability

ATA5823-PLQW 80 is available at Aetrix Electronics and suitable for automotive passive entry go (PEG), tire pressure monitoring systems (TPMS), and remote keyless entry (RKE) requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ATA5823-PLQW 80 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 connectivity solutions, with deep expertise in automotive-grade wireless ICs and functional safety certification.

The ATA5823-PLQW 80 belongs to Microchip's ATA58xx UHF transceiver product line, designed specifically for secure, low-power, SAW-free automotive keyless access and TPMS receiver applications with integrated protocol acceleration.

FAQ

What is the operating frequency band supported by the ATA5823-PLQW 80?

The ATA5823-PLQW 80 operates in the 313–316 MHz band, as explicitly defined for the ATA5823 variant in the datasheet General Description and Figure 1-1. It is not rated for 433 MHz or 868 MHz operation - those bands are assigned to the ATA5824 variant. This 315 MHz allocation aligns with North American RKE and legacy TPM systems.

Does the ATA5823-PLQW 80 support full-duplex mode for relay attack prevention?

Yes, the ATA5823-PLQW 80 supports full-duplex operation without duplex frequency offset, a core feature explicitly stated in its Features list and General Description. This enables simultaneous transmission and reception on the same frequency - a hardware-level defense against relay attacks in Passive Entry Go systems.

What is the ASK sensitivity of the ATA5823-PLQW 80 at 10 kbit/s?

The ATA5823-PLQW 80 achieves –111.5 dBm ASK sensitivity at 10 kbit/s and 433.92 MHz under 100% ASK modulation with carrier level at 433.92 MHz, as specified in the Features list and confirmed in Table 7-4 of the datasheet. While the device is rated for 313–316 MHz, this sensitivity value is extrapolated from the family-wide characterization at reference frequency.

How is output power adjusted on the ATA5823-PLQW 80?

The ATA5823-PLQW 80 supports dual-path output power adjustment: externally via resistor R_PWR (e.g., 22 kΩ sets ~5.5 dBm), and internally via SETPWR register programming in 0.5 dB steps. The PWR_H pin selects between paths, enabling both factory-trimmed and runtime-adjustable TX power - critical for regulatory compliance and range tuning.

What package type and size does the ATA5823-PLQW 80 use?

The ATA5823-PLQW 80 uses a 7 mm × 7 mm QFN48 package with exposed thermal pad (GND), as documented in the General Description and Pin Configuration sections. This compact, surface-mount package supports high-density key fob layouts and provides efficient thermal dissipation for continuous TX operation.

ATA5823-PLQW 80 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):: 20kbps

Power - Output:: 10dBm

Sensitivity:: -116dBm

Memory Size:: -

Serial Interfaces:: SPI

GPIO:: -

Voltage - Supply:: 2.15V ~ 3.6V, 4.4V ~ 5.25V

Current - Receiving:: 10.3mA ~ 10.5mA

Current - Transmitting:: 6.5mA ~ 17.3mA

Operating Temperature:: -40°C ~ 105°C

Grade:: -

Qualification:: -

Supplier Device Package:: 48-VQFN (7x7)

ATA5823-PLQW 80 FAQ

1.How can I place an order for ATA5823-PLQW 80 through Aetrix?

Please submit a Request for Quotation (RFQ) for ATA5823-PLQW 80 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 ATA5823-PLQW 80 reliable?

The price and inventory of ATA5823-PLQW 80 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5823-PLQW 80 is usually 5 days.

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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 ATA5823-PLQW 80?

For technical support, including ATA5823-PLQW 80 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5823-PLQW 80 requirements.

6.How does Aetrix verify that ATA5823-PLQW 80 is sourced from the original manufacturer or authorized distributors?

All ATA5823-PLQW 80 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 ATA5823-PLQW 80 meets industry standards.

7.What is the process for return or replacement of ATA5823-PLQW 80?

All ATA5823-PLQW 80 units undergo pre-shipment inspection (PSI). If there is an issue with ATA5823-PLQW 80, 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 ATA5823-PLQW 80 part is unused and in its original packaging.

Return procedure for ATA5823-PLQW 80:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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