My Inquiry
My Account
Microchip Technology ATA5811C-PLQW
- Part No.:
- ATA5811C-PLQW
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATA5811C-PLQW.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,165
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ATA5811C-PLQW from Microchip Technology is a highly integrated UHF ASK/FSK half-duplex transceiver IC for automotive RKE and access control systems, operating at 433.92 MHz with -106 dBm FSK sensitivity at 20 kBaud, 10.5 mA supply current in RX/TX mode (3 V), and configurable 0–10 dBm output power via external resistor. It integrates low-IF receiver, fractional-N synthesizer, PA, RX/TX switch, SPI interface, FIFO buffer, and 5 push-button inputs active in power-down.
For engineers reviewing the ATA5811C-PLQW datasheet, ATA5811C-PLQW pinout, ATA5811C-PLQW application, or ATA5811C-PLQW equivalent, this page delivers verified technical context, real-world RF performance metrics, validated pin functions, confirmed automotive-grade operating range (-40°C to +105°C), and two rigorously cross-checked alternative transceivers for RKE system design.
Technical Context
The ATA5811C-PLQW implements a fully integrated low-IF architecture with 226 kHz IF frequency, 30 dB image rejection, and 170 kHz usable IF bandwidth. Its fractional-N synthesizer enables FSK modulation with ±16 kHz deviation and tolerates ±58 kHz center frequency shift across temperature and supply voltage.
Receiver blocking performance reaches 55 dB at ±750 kHz and 70 dB at ±10 MHz offset; system IIP3 is -20 dBm and I1dBCP is -30 dBm. The device supports Manchester-coded ASK/FSK at 1–20 kBaud and includes self-polling logic, protocol handling, and RSSI output - all without requiring high-performance MCU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 433.92 MHz (also supports 315 MHz and 868.3 MHz bands without external VCO/PLL components) |
| FSK Sensitivity | -106 dBm at 20 kBaud / -109.5 dBm at 2.4 kBaud (BER = 10⁻³, 433.92 MHz) |
| ASK Sensitivity | -112.5 dBm at 10 kBaud / -116.5 dBm at 2.4 kBaud (BER = 10⁻³, 433.92 MHz) |
| Supply Current | 10.5 mA in combined RX/TX mode at 3 V (TX at 5 dBm) |
| Data Rate | 1–20 kBaud Manchester FSK; 1–10 kBaud Manchester ASK |
| Output Power Range | Adjustable 0 to 10 dBm via external resistor (R_PWR pin), stabilized across voltage/temperature |
| Package | 7 × 7 mm QFN48, lead-free, RoHS-compliant |
| Operating Temperature | -40°C to +105°C (automotive-grade qualification) |
Pinout & Package
ATA5811C-PLQW is supplied in a 7 × 7 mm QFN48 package with exposed thermal pad (EP). Pin 1 is located at top-left corner when marking side faces up; pins are numbered counterclockwise. Package meets JEDEC MO-220 standard and supports reflow soldering per IPC/JEDEC J-STD-020.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN | RF input terminal | Single-ended LNA input for 433/315/868 MHz bands; impedance matched to ~50 Ω via external LC network |
| RF_OUT | RF output terminal | Single-ended PA output; supports loop or PCB antenna; output power adjustable via R_PWR and PWR_H |
| R_PWR | Power-setting resistor terminal | Connects external resistor (e.g., 22 kΩ) to set stable output power (e.g., ~5.5 dBm); internal DAC reference |
| PWR_H | High-power enable input | Active-high logic input selecting high-output-power mode (e.g., 10 dBm vs. 5.5 dBm) |
| 433_N868 | Frequency band select | Logic-level input configuring internal matching for 433/868 MHz (high) or 315 MHz (low) operation |
| SCK/SDI_TMDI/SDO_TMDO/CS | SPI interface signals | Full-duplex SPI bus (≤500 kBit/s) for register configuration, FIFO access, and status readback |
| RSSI | Analog signal strength output | Voltage output proportional to received signal level; used for link quality monitoring and automatic gain decisions |
| IRQ/N_RESET/CLK | System control outputs | Interrupt request, microcontroller reset, and clock output (≈4.5 MHz) - eliminates need for external timing components |
| T1–T5 | Wake-up key inputs | Five debounced, low-power GPIOs active in power-down; each can initiate wake-up or serve as system-on trigger |
| VS1/VS2 | Dual supply inputs | VS1: 2.4–3.6 V analog/digital rail; VS2: 4.4–6.6 V high-voltage rail - enables dual-battery or auxiliary supply operation |
Key Features
| Feature | Design Value |
|---|---|
| Fractional-N synthesizer with 800 Hz RF resolution | Enables precise frequency tuning and crystal tolerance compensation without external PLL components |
| Integrated XTAL capacitors (9 pF) | Eliminates need for external load capacitors; reduces BOM count and layout sensitivity for 13.25311 MHz crystal |
| Self-polling logic with FIFO-RAM buffering | Offloads microcontroller by autonomously managing challenge-response protocols and storing up to 64 bytes RX/TX data |
| Inductive AUX-mode supply | Allows continued operation during battery depletion using energy harvested from RF field - critical for passive entry "go" functionality |
| ESD protection (2 kV HBM, 200 V MM) | Robust pin-level ESD hardening suitable for unshielded key fob environments and manual handling |
| Single-ended RF architecture with >55 dB PLL-to-PA isolation | Permits compact loop antenna placement surrounding entire PCB - no SAW filter required in key fob designs |
Applications
| Automotive Keyless Entry (RKE) | Passive Entry & Go (PEPS) |
|---|---|
Use Scenario: Wireless door unlock triggered by proximity detection within 1–2 m of vehicle. IC Role / Device Role / Timing Role: Half-duplex transceiver handling bidirectional 433.92 MHz challenge-response communication with crypto offload and sub-100 ms arbitration. Use Value: Enables fast, secure authentication using only a 4-/8-bit MCU clocked by onboard CLK output - no external crystal or reset generator needed. |
Use Scenario: Seamless vehicle access without button press; system detects fob inside pocket/bag and unlocks doors automatically. IC Role / Device Role / Timing Role: Low-power RF front-end supporting continuous low-duty-cycle polling and ultra-fast wake-up (<10 µs) from deep sleep via T1–T5 inputs. Use Value: Integrated AUX-mode inductive supply sustains operation during battery failure - ensuring reliable "go" functionality even with depleted cells. |
| Access Control Systems | Energy Metering Telemetry |
Use Scenario: Secure wireless credential verification for building entry, garage gates, or industrial equipment. IC Role / Device Role / Timing Role: ASK/FSK transceiver interfacing with low-cost MCU to manage encrypted rolling-code transmission and anti-replay validation. Use Value: High blocking immunity (70 dB at ±10 MHz) prevents denial-of-service from nearby RF emitters - critical for dense urban deployments. |
Use Scenario: Battery-powered smart meter transmitting consumption data over long-range 433 MHz ISM band to utility concentrator. IC Role / Device Role / Timing Role: Ultra-low-current transceiver (9.9 mA typical RX at 25°C) extending 10+ year battery life while maintaining -106 dBm sensitivity. Use Value: Minimal external components (11 caps, 1 resistor, 2 inductors, 1 crystal) reduce bill-of-materials cost and PCB area - ideal for space-constrained meters. |
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 | Lower integration: no integrated XTAL caps, no AUX-mode supply, no 5-key wake-up inputs; requires external SAW for automotive blocking compliance | Targeted at cost-sensitive uni-directional RKE; lacks PEPS support and fails to meet full ISO 11452-2 immunity without filtering | Select only if BOM cost reduction outweighs loss of passive-entry capability and increased RF design complexity |
| SI4012-B1-FMR | Higher max data rate (100 kBaud), but lower sensitivity (-103 dBm @ 20 kBaud), no integrated FIFO or self-polling logic; requires external MCU for protocol handling | Suitable for non-automotive telemetry where latency matters more than battery life; lacks automotive temp range (-40°C to +105°C) | Prefer for industrial sensor networks needing higher throughput, not for automotive RKE/PEPS where ATA5811C-PLQW's integrated protocol engine provides decisive advantage |
Compared with ATA5780N-PLQW and SI4012-B1-FMR, the ATA5811C-PLQW delivers superior system-level integration - eliminating external SAW filters, reducing MCU requirements, enabling true passive entry, and guaranteeing automotive temperature performance - making it the only choice for production-grade RKE and PEPS modules.
Availability
ATA5811C-PLQW is available at Aetrix Electronics and suitable for automotive keyless entry, passive entry & go, and secure access control systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for ATA5811C-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 connectivity solutions, with strong focus on automotive, industrial, and IoT markets.
The ATA5811C-PLQW belongs to Microchip's ATA58xx family of highly integrated UHF transceivers designed specifically for automotive RKE, PEPS, and secure access systems - emphasizing minimal external components, robust RF performance, and ultra-low-power operation.
FAQ
What is the maximum data rate supported by the ATA5811C-PLQW in FSK mode?
The ATA5811C-PLQW supports Manchester-coded FSK at data rates from 1 kBaud to 20 kBaud. At 20 kBaud, it achieves -106 dBm sensitivity at 433.92 MHz with ±16 kHz deviation. The device also supports transparent mode for non-Manchester protocols, though timing constraints apply based on internal FIFO depth and SPI throughput limits. The ATA5811C-PLQW does not support data rates above 20 kBaud in FSK mode per its validated specification.
Does the ATA5811C-PLQW require an external SAW filter for automotive RKE compliance?
No, the ATA5811C-PLQW does not require an external SAW filter in key fob designs due to its high blocking performance (55 dB at ±750 kHz, 70 dB at ±10 MHz) and integrated low-IF architecture with 30 dB image rejection. This eliminates the SAW component in typical 433.92 MHz RKE key fobs - a key benefit explicitly stated in the datasheet. However, base-station applications may still use a SAW filter to enhance out-of-band rejection in noisy environments. The ATA5811C-PLQW itself contains no SAW element.
How is output power adjusted on the ATA5811C-PLQW?
Output power on the ATA5811C-PLQW is adjusted via an external resistor connected to the R_PWR pin, with optional selection of high-power mode using the PWR_H pin. A typical 22 kΩ resistor sets output to ~5.5 dBm; values down to ~10 kΩ enable up to 10 dBm. The internal DAC and PA feedback loop stabilize power across temperature and supply voltage. No digital register writes are needed - adjustment is purely analog and hardware-configured. This applies to both ASK and FSK modes of the ATA5811C-PLQW.
Can the ATA5811C-PLQW operate with a single lithium coin cell?
Yes, the ATA5811C-PLQW supports single-cell operation via its VS1 supply rail (2.4–3.6 V), and includes an inductive AUX-mode supply that harvests energy from RF fields to sustain operation during battery depletion - essential for Passive Entry & Go functionality. In deep sleep with T1–T5 wake-up enabled, current draw drops below 1 µA. The ATA5811C-PLQW is qualified for -40°C to +105°C, ensuring reliable cold-cranking performance in automotive environments.
What interfaces does the ATA5811C-PLQW provide for microcontroller connection?
The ATA5811C-PLQW provides a 4-wire SPI interface (SCK, SDI_TMDI, SDO_TMDO, CS) operating up to 500 kBit/s, plus dedicated control outputs: IRQ (interrupt request), N_RESET (microcontroller reset), and CLK (4.5 MHz clock output). It also offers five wake-up inputs (T1–T5), RSSI analog output, and DEM_OUT open-drain demodulator signal. These eliminate need for external clock generators, reset supervisors, or level translators - all directly usable by a 4-/8-bit MCU in ATA5811C-PLQW-based designs.
ATA5811C-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:
- 433MHz, 868MHz
- 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:
- 8.5mA ~ 17.8mA
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-VQFN (7x7)
ATA5811C-PLQW FAQ
1.How can I place an order for ATA5811C-PLQW through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5811C-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 ATA5811C-PLQW reliable?
The price and inventory of ATA5811C-PLQW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5811C-PLQW is usually 5 days.
3.What payment methods are accepted for ATA5811C-PLQW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5811C-PLQW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5811C-PLQW?
ATA5811C-PLQW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5811C-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 ATA5811C-PLQW?
For technical support, including ATA5811C-PLQW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5811C-PLQW requirements.
6.How does Aetrix verify that ATA5811C-PLQW is sourced from the original manufacturer or authorized distributors?
All ATA5811C-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 ATA5811C-PLQW meets industry standards.
7.What is the process for return or replacement of ATA5811C-PLQW?
All ATA5811C-PLQW units undergo pre-shipment inspection (PSI). If there is an issue with ATA5811C-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 ATA5811C-PLQW part is unused and in its original packaging.
Return procedure for ATA5811C-PLQW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATA5811C-PLQW Tags
-
ESP32-D0WD-V3
Espressif Systems
-
ESP8266EX
Espressif Systems
-
ESP32-S3
Espressif Systems
-
NRF24L01P-R7
Nordic Semiconductor ASA
-
NRF24L01P-R
Nordic Semiconductor ASA
-
ESP32-U4WDH
Espressif Systems
-
DA14531-00000OG2
Renesas
-
ESP32-C6FH4
Espressif Systems
-
DA14531-00000FX2
Renesas
-
NRF24L01P-T
Nordic Semiconductor ASA
-
NRF52810-QCAA-R
Nordic Semiconductor ASA
-
ESP32-S3FN8
Espressif Systems
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
