My Inquiry
My Account
Microchip Technology ATA5428C-PLQW-1
- Part No.:
- ATA5428C-PLQW-1
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATA5428C-PLQW-1.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,010
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ATA5428C-PLQW-1 from Microchip Technology (formerly Atmel) is a highly integrated UHF ASK/FSK multi-channel half-duplex transceiver in a 7 × 7 mm QFN48 package. It operates at 433.92 MHz and 868.3 MHz, delivers up to +10 dBm output power, achieves –106 dBm FSK sensitivity at 20 kbit/s, and supports SPI-controlled Manchester-coded data rates from 1 to 20 kbit/s - enabling secure challenge-response remote keyless entry systems.
For engineers reviewing the ATA5428C-PLQW-1 datasheet, ATA5428C-PLQW-1 pinout, ATA5428C-PLQW-1 application, or ATA5428C-PLQW-1 equivalent, this page provides verified technical context, validated pin functions, real-world RF performance metrics, confirmed alternative transceivers with documented functional differences, and supply-chain support for automotive-grade access control designs.
Technical Context
The ATA5428C-PLQW-1 implements a low-IF receiver architecture with 226 kHz IF frequency, 30 dB image rejection, and an eighth-order integrated IF filter delivering 170 kHz usable bandwidth. Its fractional-N synthesizer enables ±2.5 MHz programmable tuning range and compensates XTAL tolerances down to ±0.5 ppm via register programming.
Transmit functionality uses closed-loop FSK modulation with digitally controlled ±16 kHz deviation and ASK switching via PA_Enable; RX/TX protocol handling, FIFO buffering, self-polling, and five push-button wake-up inputs are all managed on-die without MCU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequencies | 433.92 MHz and 868.3 MHz bands - supports dual-band operation without external VCO or PLL components |
| Modulation Support | FSK and ASK - selectable per packet; no hardware change required between modes |
| Max Output Power | +10 dBm at 433.92 MHz - adjustable from 0 to +10 dBm using external resistor R_PWR |
| FSK Sensitivity | –106 dBm at 20 kbit/s - measured at BER = 10⁻³, enabling reliable reception in noisy environments |
| ASK Sensitivity | –116.5 dBm at 2.4 kbit/s - superior low-data-rate detection for battery-powered remotes |
| Supply Voltage Range | 2.4 V to 3.6 V or 4.4 V to 6.6 V - dual-rail support enables direct Li-ion/Li-poly or 2-cell battery integration |
| Interface | SPI up to 500 kbit/s - includes CS, SCK, SDI_TMDI, SDO_TMDO, IRQ, and N_RESET for microcontroller handshaking |
Pinout & Package
ATA5428C-PLQW-1 is supplied in a 7 × 7 mm QFN48 package with exposed thermal pad (EP), lead-free and RoHS-compliant. Pin 1 is located at top-left corner adjacent to the marking dot; pins are numbered counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN | Low-noise amplifier input | Single-ended 50 Ω RF input port; impedance matched to (32 − j169) Ω at 433.92 MHz |
| RF_OUT | Power amplifier output | Single-ended RF output; supports loop or PCB antenna with integrated RX/TX switch |
| 433_N868 | Band selection control | Logic-high selects 433.92 MHz band; logic-low selects 868.3 MHz band |
| R_PWR | Output power adjustment | Resistor-connected terminal sets PA output level from 0 to +10 dBm (e.g., 22 kΩ → ~5.5 dBm) |
| PWR_H | High-power mode enable | Active-high signal to configure PA for maximum output power in TX mode |
| XTAL1 / XTAL2 | Crystal oscillator interface | Integrated 9 pF load capacitors; supports 13.25311 MHz crystal for precise frequency synthesis |
| VS1 / VS2 | Supply rails | VS1 = 2.4–3.6 V rail; VS2 = 4.4–6.6 V rail - internal regulator selects active supply based on voltage level |
| T1–T5 | Wake-up key inputs | Five debounced, low-power GPIOs active in power-down mode; each can trigger system wake-up |
| RSSI | Received signal strength indicator | Analog voltage output proportional to input RF power - used for link quality monitoring and AGC-free RSSI-based protocols |
| DEM_OUT | Raw demodulator output | Open-drain digital output of baseband signal - requires external 100 kΩ pull-up for use in transparent mode |
| CLK | System clock output | ~4.5 MHz clock provided to MCU - eliminates need for external timing source in low-cost 4-/8-bit controllers |
| N_RESET | Microcontroller reset | Active-low open-drain output - resets connected MCU during transceiver initialization or fault recovery |
Key Features
| Feature | Design Value |
|---|---|
| Fractional-N synthesizer with 800 Hz RF resolution | Enables precise channel spacing and full compensation of crystal aging/tolerance - critical for multi-channel access control systems |
| Integrated RX/TX switch and single-ended RF I/O | Allows shared loop antenna design with >55 dB blocking at ±750 kHz - eliminates need for external SAW filters in remote units |
| FIFO-RAM buffering with self-polling protocol engine | Offloads challenge-response crypto timing from MCU - enables sub-100 ms bidirectional authentication using 4-/8-bit microcontrollers |
| Inductive AUX supply mode | Supports operation when main battery is depleted - maintains wake-up and basic RF function via VAUX pin with >–1.5 kΩ start-up impedance |
| On-chip voltage regulators and low-battery indicator | Generates stable VSOUT for 3.3 V MCUs and provides battery status flag - reduces BOM count and simplifies power management |
Applications
| Remote Keyless Entry (RKE) | Passive Entry & Go (PEPS) |
|---|---|
|
Use Scenario: Vehicle door unlock triggered by proximity fob within 1–2 m range, requiring fast bidirectional crypto handshake under 100 ms. IC Role / Device Role / Timing Role: ATA5428C-PLQW-1 handles RF physical layer, FSK/ASK modulation, frequency synthesis, and protocol-level polling - acting as autonomous transceiver co-processor. Use Value: Enables same PCB size and current consumption as unidirectional RKE while supporting mutual authentication - no high-performance MCU needed. |
Use Scenario: Seamless vehicle access where driver walks toward car and doors unlock automatically without button press. IC Role / Device Role / Timing Role: ATA5428C-PLQW-1 manages low-latency LF wake-up coordination and UHF response transmission with <10 ms RX/TX turnaround. Use Value: Integrated FIFO and self-polling eliminate MCU latency bottlenecks - ensures deterministic timing for arbitration and rolling-code validation. |
| Industrial Remote Control | Smart Energy Meter Telemetry |
|
Use Scenario: Battery-powered handheld transmitter controlling HVAC, lighting, or security panels over distances up to 100 m in noisy factory environments. IC Role / Device Role / Timing Role: ATA5428C-PLQW-1 serves as complete RF front-end with high selectivity (70 dB blocking at ±10 MHz) and ultra-low RX current (8.4 mA @ –40°C). Use Value: Extended battery life (>5 years on CR2032) due to deep power-down mode with five wake-up keys and auxiliary supply fallback. |
Use Scenario: AMI (Advanced Metering Infrastructure) endpoint transmitting consumption data hourly via 868.3 MHz ISM band to utility concentrator. IC Role / Device Role / Timing Role: ATA5428C-PLQW-1 operates as certified 868 MHz transceiver with –106.5 dBm ASK sensitivity at 2.4 kbit/s - optimized for low-duty-cycle burst transmission. Use Value: Meets EN 300 220-1/2 spectral mask and blocking requirements without external SAW - reduces bill-of-materials and layout complexity. |
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 |
|---|---|---|---|
| Silicon Labs Si4432-B1B-FM | Higher max output (+20 dBm), wider frequency range (240–930 MHz), but no integrated crystal caps or key wake-up inputs | Requires external matching network and MCU-driven protocol stack - better suited for custom long-range telemetry than cost-sensitive RKE | Choose Si4432-B1B-FM when extended range or regulatory flexibility outweighs BOM simplicity and sleep-mode optimization. |
| NXP PCF7961/PCF7962 | Dedicated RKE transceiver with embedded crypto accelerator and LF receiver - lacks ASK/FSK dual-mode flexibility and 868 MHz support | Optimized for legacy fixed-code RKE; not suitable for rolling-code PEPS or multi-band deployments | Choose PCF7961/PCF7962 only for drop-in replacement in existing Atmel-based RKE designs requiring identical pinout and firmware compatibility. |
Compared with Si4432-B1B-FM and PCF7961/PCF7962, the ATA5428C-PLQW-1 uniquely combines dual-band operation, integrated crystal loading, five hardware wake-up keys, and autonomous protocol handling - making it the only option that enables true bi-directional RKE/PEPS with minimal MCU overhead and lowest total system cost.
Availability
ATA5428C-PLQW-1 is available at Aetrix Electronics and suitable for remote keyless entry, passive entry & go, industrial remote control, smart metering, and home automation applications requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability.
Supply support for ATA5428C-PLQW-1 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 acquired Atmel in 2016 and maintains full support for the ATA5428 product line. Microchip is a global leader in microcontrollers, analog, and connectivity solutions with ISO 9001-certified manufacturing and AEC-Q100 qualified automotive products.
The ATA5428 family was designed specifically for secure, low-power UHF wireless access control systems - integrating RF, protocol, power management, and wake-up logic into a single chip to replace multi-component discrete solutions in automotive and industrial remotes.
FAQ
What is the operating frequency range supported by the ATA5428C-PLQW-1?
The ATA5428C-PLQW-1 supports two licensed ISM bands: 433.92 MHz (431.5–436.5 MHz) and 868.3 MHz (862–872 MHz). It achieves full channel coverage in both bands using its fractional-N synthesizer without external VCO or PLL components - enabling single-hardware designs for regional compliance across EU and Asia.
Does the ATA5428C-PLQW-1 require an external crystal load capacitor?
No - the ATA5428C-PLQW-1 integrates 9 pF load capacitors on XTAL1 and XTAL2 pins. This eliminates the need for external capacitors and simplifies layout, especially in space-constrained remote control PCBs. The internal capacitors are factory-trimmed and support standard 13.25311 MHz crystals with ±10 ppm tolerance.
How does the ATA5428C-PLQW-1 handle frequency drift due to temperature and supply variation?
The ATA5428C-PLQW-1 uses an internal automatic frequency correction circuit in the FSK demodulator that tracks input frequency shifts post-IF filtering. Over –40°C to +85°C and 2.4–3.6 V supply, sensitivity variation is limited to ±1.8 dB - verified by measurement data showing –105.5 dBm ±1.8 dB at 20 kbit/s FSK, ensuring robust link margin without manual recalibration.
Can the ATA5428C-PLQW-1 operate with a single lithium coin cell?
Yes - the ATA5428C-PLQW-1 supports 2.4–3.6 V operation on VS1 and includes an AUX supply mode (VAUX) that activates when main battery voltage drops below threshold. In AUX mode, it maintains wake-up capability and basic RF function with >–1.5 kΩ start-up impedance - enabling continued operation even after primary CR2032 depletion.
What is the purpose of the DEM_OUT pin on the ATA5428C-PLQW-1?
The DEM_OUT pin provides the raw open-drain output of the internal FSK/ASK demodulator before data slicing. It is used in transparent mode applications where external logic or MCU performs custom decoding. A 100 kΩ pull-up resistor is required on DEM_OUT to generate valid logic levels - enabling flexible protocol implementation beyond built-in Manchester support.
ATA5428C-PLQW-1 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):
- 20kbps
- Power - Output:
- 10dBm
- Sensitivity:
- -116.5dBm
- Memory Size:
- -
- Serial Interfaces:
- SPI
- GPIO:
- -
- Voltage - Supply:
- 2.4V ~ 3.6V, 4.4V ~ 6.6V
- Current - Receiving:
- 10.3mA ~ 10.5mA
- Current - Transmitting:
- 6.5mA ~ 17.3mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-QFN (7x7)
ATA5428C-PLQW-1 FAQ
1.How can I place an order for ATA5428C-PLQW-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5428C-PLQW-1 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 ATA5428C-PLQW-1 reliable?
The price and inventory of ATA5428C-PLQW-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5428C-PLQW-1 is usually 5 days.
3.What payment methods are accepted for ATA5428C-PLQW-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5428C-PLQW-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5428C-PLQW-1?
ATA5428C-PLQW-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5428C-PLQW-1 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 ATA5428C-PLQW-1?
For technical support, including ATA5428C-PLQW-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5428C-PLQW-1 requirements.
6.How does Aetrix verify that ATA5428C-PLQW-1 is sourced from the original manufacturer or authorized distributors?
All ATA5428C-PLQW-1 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 ATA5428C-PLQW-1 meets industry standards.
7.What is the process for return or replacement of ATA5428C-PLQW-1?
All ATA5428C-PLQW-1 units undergo pre-shipment inspection (PSI). If there is an issue with ATA5428C-PLQW-1, 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 ATA5428C-PLQW-1 part is unused and in its original packaging.
Return procedure for ATA5428C-PLQW-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATA5428C-PLQW-1 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…
