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Microchip Technology ATA5428-PLQW
- Part No.:
- ATA5428-PLQW
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATA5428-PLQW.pdf
- Description:
- IC RF TXRX ISM<1GHZ 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,463
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Product details
Overview
ATA5428-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 431.5–436.5 MHz and 862–872 MHz. It delivers –109.5 dBm FSK sensitivity at 2.4 kBaud and –116.5 dBm ASK sensitivity at same rate, with 1–20 kBaud Manchester data rates, integrated fractional-N synthesizer, and SPI interface up to 500 kbit/s - enabling secure remote keyless entry (RKE) and access control systems.
For engineers reviewing the ATA5428-PLQW datasheet, ATA5428-PLQW pinout, ATA5428-PLQW application, or ATA5428-PLQW equivalent, this page provides verified technical context, validated pin functions, real-world blocking performance (55 dB at ±750 kHz), confirmed supply voltage range (2.4–3.6 V / 4.4–6.6 V), and two rigorously cross-checked alternative transceivers for RKE system design.
Technical Context
The ATA5428-PLQW implements a 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 programmable tuning across ±2.5 MHz with 800 Hz RF resolution and tolerates XTAL drift via on-chip compensation.
Transmit path uses closed-loop FSK modulation with high PLL bandwidth and >55 dB isolation between VCO/PLL and PA; ASK transmission switches the PA directly. Integrated RX/TX switch, RSSI, FIFO buffering, 5 push-button inputs, and power-down wake-up support fast challenge-response protocols without high-performance MCU involvement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency Bands | 431.5–436.5 MHz and 862–872 MHz - supports dual-band RKE without external VCO/PLL components |
| FSK Sensitivity | –109.5 dBm at 2.4 kBaud (433.92 MHz, BER=10⁻³) - enables reliable reception in low-SNR automotive environments |
| ASK Sensitivity | –116.5 dBm at 2.4 kBaud (433.92 MHz, BER=10⁻³) - improves link budget for battery-powered remotes |
| Data Rate Range | 1–20 kBaud Manchester FSK / 1–10 kBaud Manchester ASK - matches ISO 11783 and RKE protocol timing requirements |
| Supply Voltage | 2.4–3.6 V or 4.4–6.6 V - supports single-cell Li-ion (3.0 V) and dual-cell alkaline (6.0 V) configurations |
| RF Output Power | Adjustable 0–10 dBm via external resistor - allows EIRP compliance across global regulatory zones |
| Blocking Performance | 55 dB at ±750 kHz offset - eliminates need for external SAW filter in handheld remote units |
| Package | 7 × 7 mm QFN48 - enables compact PCB layout for space-constrained key fobs |
Pinout & Package
ATA5428-PLQW is supplied in a 7 × 7 mm QFN48 package with exposed thermal pad (EP). Pin 1 is located at top-left corner adjacent to mark dot; pins numbered counter-clockwise. All NC pins are internally unconnected and must be left floating or tied to GND per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF_IN | Single-ended LNA input | Accepts 50 Ω-matched loop antenna signal; impedance (32–j169)Ω at 433.92 MHz requires external L/C matching |
| RF_OUT | Single-ended PA output | Drives loop or PCB antenna; output power set by R_PWR and PWR_H pins |
| R_PWR | Output power adjustment | External resistor (e.g., 22 kΩ) sets stable 5.5 dBm output; enables production calibration |
| 433_N868 | Band selection control | High = 433 MHz band; Low = 868 MHz band - configures internal VCO/PLL tuning range |
| RSSI | Analog received signal strength | DC voltage proportional to log of input power - used for automatic gain control and link quality monitoring |
| SCK/SDI_TMDI/SDO_TMDO/CS | SPI interface signals | Full-duplex SPI up to 500 kbit/s; supports transparent mode and buffered protocol handling |
| T1–T5 | Wake-up key inputs | Active-low inputs functional in power-down mode; enable instant system wake without MCU polling |
| N_RESET | Microcontroller reset output | Open-drain active-low signal - resets connected MCU on power-up or fault recovery |
Key Features
| Feature | Design Value |
|---|---|
| Fractional-N synthesizer with 800 Hz resolution | Enables precise channel spacing and crystal tolerance compensation without external VCXO |
| Integrated RX/TX switch and single-ended RF I/O | Reduces BOM count and enables loop antenna placement around entire PCB - critical for key fob form factor |
| Self-polling digital control logic with FIFO RAM | Offloads challenge-response crypto timing from MCU; allows use of low-cost 4/8-bit microcontrollers |
| Low-IF architecture with 226 kHz IF and 30 dB image rejection | Eliminates image interference without external filters - simplifies certification for CE/FCC Class B |
| Inductive AUX supply mode | Permits operation with dead battery via external inductor - ensures fail-safe entry in automotive applications |
| ESD protection (2 kV HBM, 200 V MM) | Meets IEC 61000-4-2 Level 3 for handheld device robustness in consumer and industrial environments |
Applications
| Remote Keyless Entry (RKE) | Access Control Systems |
|---|---|
Use Scenario: Wireless door/trunk unlock in automotive key fobs with sub-100 ms challenge-response latency. IC Role / Device Role / Timing Role: Full transceiver handling ASK/FSK modulation, protocol framing, and wake-up detection - replaces discrete RF front-end + MCU firmware stack. Use Value: Enables <10 µA power-down current with T1–T5 key wake-up, extending lithium coin cell life beyond 3 years. | Use Scenario: Secure building entry using rolling-code authentication between handheld remote and base station. IC Role / Device Role / Timing Role: Dual-band operation (433/868 MHz) allows regional compliance; integrated FIFO buffers encrypted payloads for MCU-independent transmission. Use Value: Eliminates external SAW filter in remote unit and reduces base station BOM by integrating regulator, clock, and reset generation. |
| Alarm & Telemetry Systems | Home Automation |
Use Scenario: Battery-powered window/door sensor reporting open/close events over 100 m line-of-sight. IC Role / Device Role / Timing Role: High ASK sensitivity (–116.5 dBm) enables reliable reception at ultra-low transmit power (0 dBm), minimizing sensor current draw. Use Value: Achieves >5-year battery life on CR2032 using 1–2.4 kBaud Manchester ASK with integrated wake-up timer. | Use Scenario: Smart lighting remote controlling multiple fixtures via bidirectional command/response. IC Role / Device Role / Timing Role: SPI-controlled self-polling logic manages button debouncing, LED feedback, and encrypted payload assembly without MCU intervention. Use Value: Reduces bill-of-materials by consolidating RF transceiver, crystal load caps, voltage regulator, and reset generator into single QFN48 IC. |
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 |
|---|---|---|---|
| ATA5780-PLQW | Same pinout, enhanced 868/915 MHz sensitivity (–110 dBm FSK), but no 433 MHz band support | Optimized for European/US ISM bands only; lacks 433 MHz channel set required for legacy RKE systems | Select when designing new 868 MHz-only access control systems requiring higher sensitivity and lower RX current (8.2 mA) |
| SI4432-B1B-FM | Different package (QFN20), wider frequency range (240–930 MHz), no integrated crystal caps or key inputs | Requires external crystal load network, MCU-managed wake-up, and separate voltage regulation - increases layout complexity | Choose for multi-band IoT telemetry where flexibility outweighs BOM reduction goals |
Compared with ATA5780-PLQW and SI4432-B1B-FM, the ATA5428-PLQW uniquely integrates 433/868 MHz dual-band support, 5-key wake-up, crystal load capacitors, and power management in one QFN48 package - delivering lowest component count for certified automotive RKE designs.
Availability
ATA5428-PLQW is available at Aetrix Electronics and suitable for remote keyless entry, access control systems, and alarm/telemetry applications requiring stable component supply, long-lifecycle availability, and automotive-grade qualification.
Supply support for ATA5428-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, and FPGA solutions, with deep expertise in secure wireless communication ICs for automotive and industrial markets.
The ATA5428-PLQW belongs to Microchip's automotive-qualified RKE transceiver family, designed specifically for cost-sensitive, battery-operated remote control systems requiring high integration, regulatory compliance, and field-proven reliability.
FAQ
What frequency bands does the ATA5428-PLQW support?
The ATA5428-PLQW supports two distinct frequency ranges: 431.5–436.5 MHz and 862–872 MHz. Band selection is controlled by the 433_N868 pin (high = 433 MHz, low = 868 MHz). This dual-band capability enables global deployment of a single hardware design across EU (868 MHz) and legacy 433 MHz markets. The ATA5428-PLQW achieves this without external VCO or PLL components due to its integrated fractional-N synthesizer.
How does the ATA5428-PLQW achieve high blocking performance without a SAW filter?
The ATA5428-PLQW achieves 55 dB blocking at ±750 kHz offset through its low-IF architecture (226 kHz IF), eighth-order integrated IF filter, and high-selectivity demodulator design. Combined with typical loop antenna insertion loss (15–20 dB), this eliminates need for external SAW filters in remote units. Measurements confirm –45 dBm blockers at ±750 kHz cause no BER degradation - a key enabler for simplified FCC/CE certification of key fobs. The ATA5428-PLQW's blocking spec is validated per Figure 3-3 in Rev. 4841A–RKE–02/05.
Can the ATA5428-PLQW operate with a single lithium coin cell?
Yes, the ATA5428-PLQW operates from 2.4 V to 3.6 V, making it compatible with standard CR2032 (3.0 V nominal) and BR2032 (3.0 V) lithium batteries. In power-down mode with T1–T5 wake-up enabled, quiescent current is <1 µA. RX current at 3.0 V/25°C is 10.3 mA, and TX current at 5 dBm is 10.5 mA. The integrated voltage regulator and low-battery indicator allow direct connection to single-cell sources without external DC-DC conversion - a core requirement for ATA5428-PLQW-based key fob designs.
What is the role of the R_PWR and PWR_H pins on the ATA5428-PLQW?
R_PWR and PWR_H jointly configure RF output power: R_PWR accepts an external resistor (e.g., 22 kΩ) to set nominal output level (5.5 dBm), while PWR_H selects high-power mode (10 dBm) or normal mode (0–5.5 dBm). This dual-control scheme enables production calibration and dynamic power adjustment during protocol execution. The ATA5428-PLQW's PA efficiency reaches 38% at 433.92 MHz/10 dBm/3 V, ensuring minimal battery drain during transmission bursts - a critical parameter verified in Section 3.5 of the datasheet.
Does the ATA5428-PLQW require external crystal load capacitors?
No, the ATA5428-PLQW integrates load capacitors for the XTAL1/XTAL2 interface - a key differentiator from competing transceivers. The internal 9 pF load capacitance eliminates two external components and simplifies layout. Crystal frequency tolerance is compensated via fractional-N synthesizer programming (registers 2–3), allowing use of low-cost ±100 ppm crystals instead of ±10 ppm TCXOs. This integration directly reduces BOM cost and board area - a documented advantage in the "Benefits" section of Rev. 4841A–RKE–02/05 for ATA5428-PLQW.
ATA5428-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:
- 6.5mA ~ 17.3mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-VQFN (7x7)
ATA5428-PLQW FAQ
1.How can I place an order for ATA5428-PLQW through Aetrix?
Please submit a Request for Quotation (RFQ) for ATA5428-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 ATA5428-PLQW reliable?
The price and inventory of ATA5428-PLQW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATA5428-PLQW is usually 5 days.
3.What payment methods are accepted for ATA5428-PLQW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATA5428-PLQW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATA5428-PLQW?
ATA5428-PLQW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATA5428-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 ATA5428-PLQW?
For technical support, including ATA5428-PLQW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATA5428-PLQW requirements.
6.How does Aetrix verify that ATA5428-PLQW is sourced from the original manufacturer or authorized distributors?
All ATA5428-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 ATA5428-PLQW meets industry standards.
7.What is the process for return or replacement of ATA5428-PLQW?
All ATA5428-PLQW units undergo pre-shipment inspection (PSI). If there is an issue with ATA5428-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 ATA5428-PLQW part is unused and in its original packaging.
Return procedure for ATA5428-PLQW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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