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Renesas RKZ33BKJ#R1
- Part No.:
- RKZ33BKJ#R1
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RKZ33BKJ#R1.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:24,000
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Product details
Overview
RKZ33BKJ#R1 from Renesas Electronics is a silicon planar Zener diode designed for surge absorption and voltage stabilization in low-power signal and interface protection circuits. It delivers a nominal Zener voltage of 33 V (min 31.0 V, max 35.0 V) at 2 mA test current, with dynamic resistance of 80 Ω, reverse current ≤2 μA at 25 V, and ESD capability of ±8 kV per IEC 61000-4-2 (C = 150 pF, R = 330 Ω). It is used in overvoltage clamping for USB data lines, sensor supply rails, and microcontroller I/O protection.
For engineers reviewing the RKZ33BKJ#R1 datasheet, RKZ33BKJ#R1 pinout, RKZ33BKJ#R1 application, or RKZ33BKJ#R1 equivalent, key selection criteria include its 33 V Zener tolerance (±3.0%), ultra-small UFP package footprint (1.7 × 1.2 × 0.6 mm), 150 mW power dissipation on PCB, 150 °C junction temperature rating, and verified ±8 kV ESD robustness in both forward and reverse directions.
Technical Context
This device operates as a two-terminal voltage reference and transient suppressor, leveraging silicon planar junction technology for stable breakdown characteristics. Its Zener voltage exhibits a positive temperature coefficient above ~5 V, confirmed by characteristic curves showing +0.06 %/°C at 33 V - enabling predictable thermal drift in bias networks.
The RKZ33BKJ#R1 is optimized for surface-mount applications requiring minimal board area and high reliability under repetitive low-energy transients. Its UFP (Ultra small Flat Lead) package supports automated placement and reflow soldering, with exposed lead tips ensuring consistent solder wetting per manufacturer note.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 31.0–35.0 V at IZ = 2 mA - defines clamping threshold for overvoltage events on 3.3 V or 5 V system rails. |
| Dynamic Resistance (rd) | 80 Ω max at IZ = 2 mA - determines voltage deviation under load changes; critical for precision regulation stability. |
| Reverse Current (IR) | ≤2 μA at VR = 25 V - ensures minimal leakage in standby mode, preserving battery life in portable systems. |
| Power Dissipation (Pd) | 150 mW at Ta = 25°C on PCB - sets maximum continuous clamping energy without thermal runaway. |
| ESD Capability | ±8 kV (IEC 61000-4-2, C = 150 pF, R = 330 Ω) - qualifies for Level 4 system-level ESD immunity in industrial interfaces. |
| Junction Temperature (Tj) | −55 to +150 °C - enables operation in extended-temperature environments such as automotive under-hood sensors. |
| Package | UFP (SC-79), 2-pin, 1.7 × 1.2 × 0.6 mm - compatible with 0603 footprint constraints and high-density PCB layouts. |
Pinout & Package
UFP (Ultra small Flat Lead) package: 2-pin surface-mount device with cathode marked by dot; leads are flat, gull-wing shaped, and exposed at tip for reliable solder joint formation. Dimensions: 1.7 mm length × 1.2 mm width × 0.6 mm height (JEITA code PWSF0002ZA-A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to higher-potential node during clamping; polarity must be observed to avoid forward conduction in protection circuits. |
| 2 | Anode | Connected to reference or ground; forms return path during transient suppression and establishes Zener bias direction. |
Key Features
| Feature | Design Value |
|---|---|
| Emboss taping reel packaging | Enables high-speed automated SMT placement with consistent orientation and zero tape jam risk. |
| Ultra-small UFP footprint | Reduces PCB area by >40% vs. SOD-323; fits within tight spacing around high-speed digital I/O traces. |
| Controlled Zener voltage tolerance | ±3.0% at 33 V (31.0–35.0 V range) - ensures predictable clamping without margin overdesign. |
| High ESD robustness | ±8 kV contact discharge - eliminates need for external TVS in cost-sensitive consumer USB or UART interfaces. |
| Thermal stability | +0.06 %/°C tempco - allows accurate voltage reference use across −40 to +105 °C ambient ranges. |
Applications
| USB 2.0 Data Line Protection | Sensor Supply Rail Stabilization |
|---|---|
Use Scenario: Clamping ESD spikes on D+ and D− lines of embedded USB peripherals. IC Role / Device Role / Timing Role: Passive bidirectional voltage clamp placed between data line and ground. Use Value: Prevents latch-up in USB transceivers by limiting transient voltage to ≤35 V while adding <0.1 pF parasitic capacitance. |
Use Scenario: Stabilizing 3.3 V supply to analog temperature or pressure sensors in IoT nodes. IC Role / Device Role / Timing Role: Shunt regulator maintaining reference voltage under varying load and temperature. Use Value: Delivers ±1.5% output stability over −40 to +85 °C with no external components required. |
| Microcontroller I/O Pin Protection | Industrial Serial Interface Clamping |
Use Scenario: Protecting GPIO pins of ARM Cortex-M MCUs against induced surges in factory automation panels. IC Role / Device Role / Timing Role: Standby-mode shunt protector activated only during overvoltage events. Use Value: Limits pin voltage to safe levels (<35 V) with <2 μA leakage, avoiding false wakeups or input damage. |
Use Scenario: Surge suppression on RS-485 receiver inputs exposed to long cable runs in building control systems. IC Role / Device Role / Timing Role: Front-end transient absorber before differential receiver IC. Use Value: Absorbs non-repetitive 100 W surges (per Fig.4 reference) without degradation, extending interface IC lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55-C33 (ON Semiconductor) | Through-hole DO-35 package; 5% tolerance (31.35–34.65 V); 500 mW Pd; no specified ESD rating. | Requires PCB through-hole space; unsuitable for high-density SMT designs; lacks certified ESD performance. | Select when legacy through-hole assembly is mandated and ESD immunity is handled elsewhere in the system. |
| MMBZ5256BS-7-F (Diodes Inc.) | SOD-523 package; 5% tolerance (31.35–34.65 V); 200 mW Pd; ±8 kV ESD rated; 110 Ω rd. | Same SMT form factor but larger footprint (1.7 × 1.3 mm vs. 1.7 × 1.2 mm); higher dynamic resistance reduces regulation precision. | Choose when slightly higher power handling is needed and 110 Ω rd is acceptable for the target regulation accuracy. |
Compared with BZX55-C33 and MMBZ5256BS-7-F, the RKZ33BKJ#R1 offers tighter 3% Zener tolerance, smallest UFP footprint in its class, and guaranteed ±8 kV ESD performance - making it optimal for space-constrained, high-reliability signal-line protection where precise clamping voltage and board-area efficiency are critical.
Availability
RKZ33BKJ#R1 is available at Aetrix Electronics and suitable for USB interface protection, sensor rail stabilization, and microcontroller I/O clamping requiring stable component supply across industrial, consumer, and IoT production programs.
Supply support for RKZ33BKJ#R1 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
The RKZ-KJ Series is part of Renesas' discrete protection portfolio, engineered specifically for compact, high-reliability surge absorption and voltage stabilization in space-constrained SMT applications.
FAQ
What is the Zener voltage tolerance of RKZ33BKJ#R1?
The RKZ33BKJ#R1 has a Zener voltage range of 31.0 V to 35.0 V at 2 mA test current, corresponding to a ±3.0% tolerance about the nominal 33 V rating. This is tighter than standard 5% Zener diodes and supports more precise clamping in sensitive analog or digital interface circuits where overvoltage margin must be minimized.
Does RKZ33BKJ#R1 meet IEC 61000-4-2 ESD requirements?
Yes, the RKZ33BKJ#R1 is rated for ±8 kV contact discharge per IEC 61000-4-2 (C = 150 pF, R = 330 Ω), tested in both forward and reverse directions. This specification is explicitly documented in the Renesas datasheet (REJ03G1588-0100) and qualifies RKZ33BKJ#R1 for Level 4 system-level ESD protection without additional external components.
What is the thermal derating behavior of RKZ33BKJ#R1?
RKZ33BKJ#R1 follows standard thermal derating: its 150 mW power dissipation rating applies only at 25°C ambient; above that, dissipation decreases linearly to zero at 150°C junction temperature. The derating curve (Fig.3 in datasheet) shows ~1.2 mW/°C reduction, meaning at 85°C ambient, usable Pd drops to approximately 78 mW - critical for sustained clamping in hot environments.
Can RKZ33BKJ#R1 replace a 33 V Zener in existing SOD-323 designs?
No - RKZ33BKJ#R1 uses the UFP (SC-79) package (1.7 × 1.2 mm), which differs mechanically from SOD-323 (1.7 × 1.3 mm) in lead pitch and body profile. While footprint overlap exists, the UFP's shorter width and gull-wing lead geometry require layout verification. Direct replacement is not assured without requalification of solder joint integrity and thermal performance.
What is the temperature coefficient of RKZ33BKJ#R1?
The RKZ33BKJ#R1 exhibits a positive temperature coefficient of +0.06 %/°C at 33 V, as shown in Fig.2 of the datasheet. This means its Zener voltage increases by ~19.8 mV per °C rise - a stable, predictable drift useful for temperature-compensated references or bias networks where monotonic drift is preferable to zero-TC ambiguity.
RKZ33BKJ#R1 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:
- -
RKZ33BKJ#R1 FAQ
1.How can I place an order for RKZ33BKJ#R1 through Aetrix?
Please submit a Request for Quotation (RFQ) for RKZ33BKJ#R1 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 RKZ33BKJ#R1 reliable?
The price and inventory of RKZ33BKJ#R1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RKZ33BKJ#R1 is usually 5 days.
3.What payment methods are accepted for RKZ33BKJ#R1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RKZ33BKJ#R1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RKZ33BKJ#R1?
RKZ33BKJ#R1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RKZ33BKJ#R1 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 RKZ33BKJ#R1?
For technical support, including RKZ33BKJ#R1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RKZ33BKJ#R1 requirements.
6.How does Aetrix verify that RKZ33BKJ#R1 is sourced from the original manufacturer or authorized distributors?
All RKZ33BKJ#R1 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 RKZ33BKJ#R1 meets industry standards.
7.What is the process for return or replacement of RKZ33BKJ#R1?
All RKZ33BKJ#R1 units undergo pre-shipment inspection (PSI). If there is an issue with RKZ33BKJ#R1, 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 RKZ33BKJ#R1 part is unused and in its original packaging.
Return procedure for RKZ33BKJ#R1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RKZ33BKJ#R1 Tags
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MM5Z5V1ST1G
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