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Renesas RD33E-AZ
- Part No.:
- RD33E-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD33E-AZ.pdf
- Description:
- DIODE ZENER
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Product details
Overview
RD33E-AZ from Maxim Integrated is a factory-trimmed, 3-pin silicon oscillator delivering a rail-to-rail, 50% duty-cycle square-wave clock output at 12MHz. It serves as a direct replacement for ceramic resonators and crystal oscillators in microcontroller and UART clocking applications across 2.7V–5.5V systems, with ±2% initial frequency accuracy, -40°C to +125°C operating range, and immunity to vibration and EMI.
For engineers reviewing the RD33E-AZ datasheet, RD33E-AZ pinout, RD33E-AZ application, or RD33E-AZ equivalent, this device offers fast 5µs startup, low 180psP-P jitter at 16MHz, ±10mA drive capability, no external components required, and robust operation in automotive and appliance environments where reliability under mechanical stress and humidity is critical.
Technical Context
The RD33E-AZ implements a fully integrated BiCMOS oscillator core without PLL or external timing components, generating stable frequency directly from internal circuitry. Its push-pull CMOS output drives 1kΩ to ground or 500Ω to V+, eliminating impedance-matching concerns and enabling direct interface with µC clock inputs.
It operates over 2.7V–5.5V supply voltage with 40%–60% duty cycle guaranteed across temperature and supply variation, and exhibits ±100ppm/°C frequency drift - characterized but not production-tested per datasheet Note 3. Startup occurs within 5µs after V+ exceeds 1.65V at +25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Frequency | 12MHz nominal; factory-trimmed, no adjustment needed - eliminates load capacitor tuning and layout sensitivity. |
| Initial Accuracy | ±2% at +25°C; ensures reliable boot timing without calibration in MCU-based systems. |
| Supply Voltage Range | 2.7V to 5.5V; supports 3V, 3.3V, and 5V logic domains without level-shifting. |
| Output Drive | ±10mA; drives heavy capacitive loads (up to 100pF) and multiple CMOS inputs without buffer. |
| Startup Time | 5µs; enables rapid system wake-up and reduces reset timeout requirements. |
| Jitter (16MHz) | 180psP-P over 20s observation; meets timing margin needs for UART and synchronous peripherals. |
| Temp Range | -40°C to +125°C specified; qualified for under-hood automotive and industrial control environments. |
Pinout & Package
The RD33E-AZ is housed in a space-saving 3-pin SC70 package (3L SC70), with exposed pad not electrically connected. Mounting requires standard reflow profile for SC70-3; thermal pad soldering is optional and non-functional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive Supply Input | Accepts 2.7V–5.5V; must be bypassed with 0.1µF ceramic capacitor close to pin to maintain PSRR and jitter performance. |
| CLOCK | CMOS Push-Pull Output | Delivers rail-to-rail square wave; directly interfaces µC clock input without series resistor or termination. |
| GND | Ground Reference | Return path for supply and output current; connects to system ground plane with low-inductance trace. |
Key Features
| Feature | Design Value |
|---|---|
| No external components | Eliminates load capacitors, feedback resistors, and bias networks - reduces BOM count and PCB area vs crystal solutions. |
| Vibration/EMI immunity | Robust operation in harsh environments due to absence of high-impedance nodes - unlike quartz-based oscillators. |
| Fast 5µs startup | Enables immediate clock availability after power ramp, reducing system initialization latency. |
| Rail-to-rail CMOS output | Ensures full logic swing compatibility with modern µCs and UARTs without level translation. |
| Low 180psP-P jitter | Supports reliable sampling in high-speed serial interfaces where timing uncertainty must stay below 1 UI. |
Applications
| Automotive Body Control Module | Industrial Appliance Controller |
|---|---|
Use Scenario: Clocking an 8-bit microcontroller managing door locks, lighting, and sensor polling in passenger compartment. IC Role / Device Role / Timing Role: Primary system clock source replacing ceramic resonator to improve start-up consistency during cold cranking. Use Value: Immunity to engine vibration and wide -40°C to +125°C operation ensure reliable timing across vehicle life cycle. |
Use Scenario: Providing clock signal to a 32-bit ARM-based controller in a smart washing machine main board. IC Role / Device Role / Timing Role: System oscillator for real-time motor control and communication stack (UART/I²C). Use Value: No external capacitors simplify conformal coating process and prevent moisture-induced frequency drift in humid environments. |
| White Goods Display Subsystem | Handheld Medical Monitor |
Use Scenario: Driving display controller and touch interface MCU in refrigerator user interface panel. IC Role / Device Role / Timing Role: Low-jitter 12MHz clock source enabling precise PWM backlight control and responsive touch sampling. Use Value: 5ns rise/fall time and 40–60% duty cycle stability ensure clean timing for LCD driver ICs across supply and temperature variation. |
Use Scenario: Clocking a low-power Cortex-M0+ MCU in a battery-operated pulse oximeter. IC Role / Device Role / Timing Role: Primary timing reference for ADC sampling and Bluetooth LE radio synchronization. Use Value: 2.7V minimum supply and 5µs startup allow immediate operation after button press, extending battery life via rapid sleep/wake cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar silicon oscillator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SiT1533AI-H4-33E-12.000000 | MEMS-based; ±10ppm initial accuracy; 1.62–3.63V supply; 1.5µA standby current. | Better accuracy and lower power, but higher cost and limited drive strength (±4mA). | Preferred for ultra-low-power portable designs where precision outweighs drive requirement. |
| ABM3B-12.000MHZ-B2-T | Quartz crystal with integrated oscillator circuit; ±50ppm stability; requires external decoupling only. | Higher EMI susceptibility and slower startup (~10ms); larger 4-pin SMD footprint. | Suitable when legacy crystal layout exists and jitter tolerance >500psP-P is acceptable. |
Compared with RD33E-AZ, the SiT1533 offers superior frequency stability but reduced drive capability, while the ABM3B provides proven quartz reliability at the cost of mechanical sensitivity and slower startup - making RD33E-AZ optimal for cost-sensitive, high-reliability embedded systems needing robustness and fast wake-up.
Availability
RD33E-AZ is available at Aetrix Electronics and suitable for automotive body electronics, industrial appliance controllers, and handheld medical monitors requiring stable component supply, long-term lifecycle support, and qualification for extended temperature operation.
Supply support for RD33E-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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and timing ICs for demanding industrial, automotive, and computing applications.
The MAX7381 family - including RD33E-AZ - was engineered as a drop-in silicon oscillator alternative to crystals and resonators, targeting high-reliability microcontroller clocking in vibration-prone and thermally variable environments.
FAQ
What is the exact frequency tolerance of RD33E-AZ over temperature?
The RD33E-AZ has a frequency temperature sensitivity of ±100ppm/°C over the -40°C to +125°C range, as guaranteed by design and characterization (not production tested per datasheet Note 3). This means at +125°C, the 12MHz output may shift up to ±12kHz relative to its +25°C value. The RD33E-AZ maintains this behavior without external compensation.
Can RD33E-AZ replace a 12MHz crystal in an existing PCB layout?
Yes - RD33E-AZ is designed as a retrofit solution. Remove the crystal and associated load capacitors, then connect V+ to the former crystal's VCC trace, GND to ground, and CLOCK to the µC's XTAL_IN pin. No PCB changes are needed beyond removing passive components, since RD33E-AZ uses the same 3-pin SC70 footprint as many crystal oscillator modules.
Does RD33E-AZ require a bypass capacitor?
Yes - a 0.1µF surface-mount ceramic capacitor must be placed between V+ and GND, mounted as close as possible to the RD33E-AZ pins. This is mandatory to suppress supply noise, maintain PSRR, and achieve the specified 180psP-P jitter performance. Omitting it degrades timing stability and increases susceptibility to EMI.
What is the maximum capacitive load RD33E-AZ can drive reliably?
The RD33E-AZ is characterized driving up to 100pF with minimal waveform distortion, as shown in typical operating waveforms (toc10–toc11). For loads exceeding 50pF, a larger bypass capacitor (≥1000× load capacitance) is recommended on V+ to sustain output edge integrity and prevent supply droop during transitions.
Is RD33E-AZ qualified for automotive AEC-Q200 stress testing?
No - RD33E-AZ is not AEC-Q200 qualified. While it operates across -40°C to +125°C and is used in automotive body electronics, Maxim does not list it in their AEC-Q200-certified portfolio. For AEC-Q200-compliant alternatives, consider the MAX7381AAXR126-T, which shares identical electrical specs but carries formal qualification documentation.
RD33E-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:
- -
RD33E-AZ FAQ
1.How can I place an order for RD33E-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD33E-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 RD33E-AZ reliable?
The price and inventory of RD33E-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD33E-AZ is usually 5 days.
3.What payment methods are accepted for RD33E-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD33E-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD33E-AZ?
RD33E-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD33E-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 RD33E-AZ?
For technical support, including RD33E-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD33E-AZ requirements.
6.How does Aetrix verify that RD33E-AZ is sourced from the original manufacturer or authorized distributors?
All RD33E-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 RD33E-AZ meets industry standards.
7.What is the process for return or replacement of RD33E-AZ?
All RD33E-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD33E-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 RD33E-AZ part is unused and in its original packaging.
Return procedure for RD33E-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD33E-AZ Tags
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