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Renesas RD3.3E-T1-AZ
- Part No.:
- RD3.3E-T1-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD3.3E-T1-AZ.pdf
- Description:
- DIODE ZENER
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Inventory:26,000
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Product details
Overview
RD3.3E-T1-AZ from Micrel is a monolithic UHF ASK transmitter IC operating in the 800MHz–1GHz band, delivering –3dBm EIRP output power with automatic antenna tuning and 115kbps data rate support. It functions as a "data-in, antenna-out" RF transmitter for battery-powered remote control systems, requiring only a single external crystal and minimal passive components.
For engineers reviewing the RD3.3E-T1-AZ datasheet, RD3.3E-T1-AZ pinout, RD3.3E-T1-AZ application, or RD3.3E-T1-AZ equivalent, key selection considerations include its integrated varactor-based antenna alignment, low standby current (<1µA), ASK/OOK modulation compatibility, and SOIC-8 packaging for compact PCB integration in cost-sensitive wireless links.
Technical Context
The RD3.3E-T1-AZ implements a fully integrated UHF synthesizer with quadrature I/Q outputs: the in-phase (I) signal drives the power amplifier while the quadrature (Q) signal feeds a phase detector for closed-loop antenna tuning. Its internal varactor capacitance (2.6–3.3pF range) dynamically compensates for antenna impedance drift across temperature and supply voltage.
Transmit frequency is derived from a REFOSC input clock divided by 64, supporting crystal or AC-coupled reference sources. Calibration occurs at power-up or after STBY exit (20ms), and PA bias is regulated via the PC pin (0.1–0.4V) to maintain constant output power up to regulatory limits over battery life.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency Range | 800MHz to 1GHz - supports global unlicensed UHF bands including 868MHz and 915MHz ISM allocations. |
| Output Power (EIRP) | –3dBm - compliant with ETSI EN 300 220 and FCC Part 15.247 radiated emission limits for short-range devices. |
| Data Rate | Up to 115kbps - enables responsive remote actuation and sensor telemetry without intersymbol interference. |
| Standby Current | <1µA - extends battery life in intermittent-use applications such as key fobs and wireless sensors. |
| Modulation Type | ASK/OOK - compatible with standard super-regenerative and super-heterodyne receivers across vendor families. |
| Supply Voltage | 4.75V to 5.5V - matches common 5V logic and LDO-regulated battery systems. |
| Operating Temp | –40°C to +85°C - qualified for automotive RKE, industrial controls, and outdoor consumer electronics. |
Pinout & Package
RD3.3E-T1-AZ is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package, 3.9mm × 4.9mm body size, 1.27mm pitch, with gull-wing leads and JEDEC MS-012AC compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PC | Power Control Input | 0.1–0.4V analog voltage sets PA bias; enables precise output power regulation independent of battery decay. |
| VDD | Positive Supply | 4.75–5.5V main power rail; requires local 0.1µF + 4.7µF bypassing to VSS for RF stability. |
| VSS | Ground Reference | Common return for analog/digital/RF sections; shortest possible trace to bypass capacitors minimizes noise coupling. |
| REFOSC | Reference Oscillator Input | Accepts 13.5625MHz crystal (ESR <20Ω) or AC-coupled 0.5Vpp clock; defines transmit carrier via ÷64 division. |
| STBY | Standby Enable | Logic-high (≥0.8VDD) activates transmission; logic-low (≤0.1VDD) reduces current to <1µA. |
| ANTM / ANTP | Differential RF Output | True differential 50Ω RF ports; drive balanced antennas or SAW filters without external balun. |
| ASK | Amplitude Shift Key Input | Digital ASK data input (0.1VDD/0.8VDD thresholds); CW mode enabled by tying to VDD. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Antenna Tuning | On-chip varactor and phase detector eliminate manual antenna matching, reducing production calibration time and test fixture cost. |
| Single-Chip Transmitter Architecture | Replaces discrete oscillator, PA, modulator, and tuning circuitry - cuts BOM count to ≤5 external parts (crystal, caps, resistors). |
| Regulatory-Compliant Output Power | Fixed –3dBm EIRP with ±2dBm variation over temp/supply ensures consistent certification across production lots. |
| Low-Power Standby Mode | <1µA quiescent current enables multi-year operation on coin-cell batteries in infrequently used remotes. |
| Fast Wake-Up & Stabilization | 20ms calibration + 9ms stabilization from STBY to valid transmission enables rapid burst-mode communication. |
Applications
| Remote Keyless Entry (RKE) | Garage Door Opener |
|---|---|
Use Scenario: Handheld fob transmits encrypted door unlock command within 10m line-of-sight. IC Role / Device Role / Timing Role: Primary ASK transmitter generating 868MHz carrier synchronized to microcontroller data stream. Use Value: Automatic antenna tuning maintains link margin despite mechanical stress or temperature shifts in plastic enclosure. | Use Scenario: Wall-mounted button sends one-shot open/close signal to motor controller via 315MHz or 433MHz band. IC Role / Device Role / Timing Role: Low-cost, high-reliability OOK transmitter interfaced directly to momentary switch and MCU GPIO. Use Value: Sub-1µA standby current enables 5+ year battery life in rarely operated residential units. |
| Wireless Light/Fan Control | Industrial Sensor Telemetry |
Use Scenario: Battery-powered wall switch controls ceiling fan speed and light dimming via bidirectional RF link. IC Role / Device Role / Timing Role: ASK transmitter encoding PWM-derived digital commands at ≤10kbps for interference resilience. Use Value: 115kbps headroom allows future firmware upgrades adding status feedback or encryption handshake. | Use Scenario: Environmental sensor node reports temperature/humidity every 5 minutes using ultra-low-duty-cycle transmission. IC Role / Device Role / Timing Role: Burst-mode transmitter activated only during scheduled data upload; otherwise held in STBY. Use Value: Integrated power regulation via PC pin sustains consistent –3dBm output across 3.0–4.2V Li-ion discharge curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UHF ASK transmitter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Silicon Labs Si4010 | Integrated EEPROM, higher output (+10dBm), no external crystal required (internal RC oscillator). | Supports longer-range (>100m) and self-contained firmware updates; requires different layout for higher-power RF routing. | Choose when system-level reprogrammability and extended range outweigh BOM simplicity and cost sensitivity. |
| ON Semiconductor NB3N502 | Fixed-frequency (315/433MHz), no automatic tuning, lower data rate (up to 20kbps), SOIC-8 pinout. | Limited to legacy sub-GHz bands; lacks adaptive antenna compensation for variable enclosures or mounting conditions. | Choose only for cost-optimized, fixed-band designs where antenna environment is highly controlled and certified. |
Compared with RD3.3E-T1-AZ, Si4010 offers greater integration and range but increases layout complexity and unit cost, while NB3N502 simplifies design for static installations at the expense of adaptability and data throughput - RD3.3E-T1-AZ balances tunability, power efficiency, and manufacturability for high-volume consumer remotes.
Availability
RD3.3E-T1-AZ is available at Aetrix Electronics and suitable for remote keyless entry systems, wireless home automation controllers, and industrial sensor telemetry nodes requiring stable component supply across multi-year production cycles.
Supply support for RD3.3E-T1-AZ 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
Micrel, Inc. was a U.S.-based semiconductor company specializing in analog, power management, and RF solutions before its acquisition by Microchip Technology in 2015. Known for high-reliability, cost-optimized ICs for industrial and consumer markets.
The RD3.3E-T1-AZ belongs to Micrel's QwikRadio™ family of single-chip RF transceivers, designed specifically to reduce development time and production cost for battery-operated wireless remote controls and sensor links.
FAQ
What is the recommended crystal specification for RD3.3E-T1-AZ?
The RD3.3E-T1-AZ requires a fundamental-mode crystal with nominal frequency of 13.5625MHz, load capacitance of 12pF, ESR ≤20Ω, and stability of ±100ppm over –40°C to +85°C. This value yields 868MHz (×64) or 915MHz (×64) carrier frequencies. The RD3.3E-T1-AZ datasheet specifies crystal drive level must not exceed 100µW to avoid aging or frequency drift.
Does RD3.3E-T1-AZ support both 868MHz and 915MHz operation?
Yes, RD3.3E-T1-AZ supports both 868MHz and 915MHz operation through selection of the REFOSC crystal frequency: 13.5625MHz yields 868MHz (13.5625 × 64), while 14.2969MHz yields 915MHz. The RD3.3E-T1-AZ's internal synthesizer and antenna tuner automatically adapt to either frequency without hardware changes.
How does RD3.3E-T1-AZ maintain constant output power over battery discharge?
RD3.3E-T1-AZ uses its PC pin (0.1–0.4V input) to set a reference for closed-loop PA bias control. Combined with internal power detection and varactor tuning, this ensures stable –3dBm EIRP output across 4.75–5.5V supply range - critical for maintaining regulatory compliance and link budget as the battery voltage drops from 4.2V to 3.0V.
Can RD3.3E-T1-AZ be used with a PCB trace antenna?
Yes, RD3.3E-T1-AZ is explicitly designed for use with PCB monopole or differential antennas. Its integrated antenna tuner compensates for trace length, width, and substrate variations. Application Note AN-127 shows validated 868MHz PCB antenna layouts with 50Ω differential feed; no balun or matching network is required due to ANTP/ANTM differential output architecture.
What is the minimum ASK input pulse width supported by RD3.3E-T1-AZ?
The RD3.3E-T1-AZ supports ASK data rates up to 115kbps, corresponding to a minimum pulse width of ≈4.3µs (50% duty cycle). The device's modulation envelope rise/fall time is <1µs, enabling clean transitions even at high data rates. For reliable decoding, receiver-side bandwidth must exceed 115kHz to avoid intersymbol interference.
RD3.3E-T1-AZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
RD3.3E-T1-AZ FAQ
1.How can I place an order for RD3.3E-T1-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD3.3E-T1-AZ 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 RD3.3E-T1-AZ reliable?
The price and inventory of RD3.3E-T1-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD3.3E-T1-AZ is usually 5 days.
3.What payment methods are accepted for RD3.3E-T1-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD3.3E-T1-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD3.3E-T1-AZ?
RD3.3E-T1-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD3.3E-T1-AZ 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 RD3.3E-T1-AZ?
For technical support, including RD3.3E-T1-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD3.3E-T1-AZ requirements.
6.How does Aetrix verify that RD3.3E-T1-AZ is sourced from the original manufacturer or authorized distributors?
All RD3.3E-T1-AZ 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 RD3.3E-T1-AZ meets industry standards.
7.What is the process for return or replacement of RD3.3E-T1-AZ?
All RD3.3E-T1-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD3.3E-T1-AZ, 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 RD3.3E-T1-AZ part is unused and in its original packaging.
Return procedure for RD3.3E-T1-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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