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Renesas RKZ3.9B2KJ#R1
- Part No.:
- RKZ3.9B2KJ#R1
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RKZ3.9B2KJ#R1.pdf
- Description:
- DIODE ZENER
- Quantity:
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Inventory:56,000
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Product details
Overview
RKZ3.9B2KJ from Renesas Electronics is a silicon planar Zener diode designed for surge absorption and voltage stabilization in low-power signal and interface circuits. It delivers a nominal Zener voltage of 3.9 V (min 3.87 V, max 4.10 V) at 5 mA, with dynamic resistance of 130 Ω, reverse current ≤10 μA at 1.0 V, and 150 mW power dissipation on PCB - suitable for ESD-protected I/O line clamping in portable sensor interfaces.
For engineers reviewing the RKZ3.9B2KJ datasheet, RKZ3.9B2KJ pinout, RKZ3.9B2KJ application, or RKZ3.9B2KJ equivalent, this device serves as a precision low-voltage clamp in space-constrained SMT designs where thermal stability, ESD robustness (±30 kV per IEC 61000-4-2), and tight VZ tolerance are critical selection criteria.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to regulate or clamp voltage across sensitive nodes. Its ultra-small Flat Lead Package (UFP, JEITA code PWSF0002ZA-A, SC-79 compatible) enables high-density placement on compact PCBs while maintaining thermal performance up to 150°C junction temperature.
The device exhibits a negative temperature coefficient near 3.9 V (≈−0.04 %/°C per Fig.2), ensuring predictable drift under ambient variation. Its non-repetitive surge reverse power rating supports transient suppression events up to ~1.0 W for 1 ms (Fig.5), making it appropriate for secondary-level protection downstream of primary TVS devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.87–4.10 V at IZ = 5 mA - defines precise clamping threshold for 3.3 V rail protection |
| Dynamic Resistance (rd) | 130 Ω max at IZ = 5 mA - determines voltage deviation under load current changes |
| Reverse Current (IR) | ≤10 μA at VR = 1.0 V - ensures minimal leakage in standby or high-impedance sensing paths |
| Power Dissipation (Pd) | 150 mW on PCB - sets maximum continuous clamping power without derating below 25°C |
| ESD Capability | ±30 kV (HBM, C = 150 pF, R = 330 Ω) - qualifies for direct I/O pin protection in consumer-grade interfaces |
| Junction Temperature (Tj) | −55 to +150 °C - supports operation in extended industrial environments with localized heating |
Pinout & Package
Package: Ultra Small Flat Lead (UFP), JEITA code PWSF0002ZA-A, SC-79 footprint (0.8 mm × 1.2 mm × 0.5 mm), cathode-marked top-side marking "3·9".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to protected node or supply rail; reverse-bias anode reference point for clamping |
| 2 | Anode | Typically grounded or tied to lower-potential reference; completes conduction path during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Emboss taping reel packaging | Enables automated SMT placement with consistent orientation and zero tape jam risk |
| Ultra-small UFP package | 0.8 mm × 1.2 mm footprint saves >60% board area vs. SOD-323, critical for wearables and IoT sensors |
| Tight Zener voltage tolerance | ±2.8% at 3.9 V (3.87–4.10 V) enables accurate 3.3 V rail clamping without external trimming |
| High ESD immunity | ±30 kV HBM meets IEC 61000-4-2 Level 4 for unshielded user-accessible ports |
| Low leakage current | ≤10 μA at 1.0 V reverse bias preserves battery life in always-on sensor monitoring circuits |
Applications
| USB Data Line Protection | I²C Bus Clamping |
|---|---|
Use Scenario: Protecting D+ and D− lines of USB 2.0 peripherals against ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between data line and ground, conducting only during transients exceeding ±3.9 V. Use Value: Prevents latch-up or damage to USB transceivers by limiting peak line voltage to safe levels without affecting 480 Mbps signaling integrity. |
Use Scenario: Stabilizing pull-up voltage on I²C SDA/SCL lines in multi-master embedded systems operating at 3.3 V. IC Role / Device Role / Timing Role: Low-leakage Zener shunt regulator maintaining stable logic-high level despite bus capacitance and leakage variations. Use Value: Ensures reliable bus arbitration and noise margin by holding pull-up voltage within 3.7–4.0 V range across temperature and aging. |
| Low-Power Sensor Interface | Microcontroller GPIO Clamp |
Use Scenario: Shielding analog output pins of MEMS accelerometers or temperature sensors from board-level ESD coupling. IC Role / Device Role / Timing Role: Signal-line protector placed directly at sensor output pad, sinking transient current before reaching ADC input. Use Value: Maintains sub-mV measurement accuracy by limiting post-clamp overshoot and avoiding forward conduction into sensor core. |
Use Scenario: Adding secondary overvoltage protection to MCU GPIO pins used for button inputs or LED drive in handheld devices. IC Role / Device Role / Timing Role: Fast-reacting shunt element that activates before internal GPIO ESD diodes reach thermal failure limit. Use Value: Extends system field lifetime by absorbing >90% of 8 kV contact discharge energy, reducing stress on integrated protection structures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C3V9 (Nexperia) | VZ = 3.7–4.1 V (±5%), rd = 90 Ω max, Pd = 300 mW, SOD-523 package (1.2 × 0.8 mm) | Higher power rating allows higher surge duty cycles; larger package increases board area by ~25% | Select when higher single-pulse energy handling is required and layout permits SOD-523 footprint |
| MMSZ4685 (ON Semiconductor) | VZ = 3.7–4.1 V (±5%), rd = 150 Ω max, Pd = 350 mW, SOD-123 package (3.7 × 1.6 mm) | Lower dynamic resistance improves regulation but significantly larger size limits high-density use | Choose for cost-sensitive industrial controls where board space is not constrained and tighter VZ drift is acceptable |
Compared with BZX584-C3V9 and MMSZ4685, RKZ3.9B2KJ offers the smallest footprint and tightest VZ tolerance in its class, prioritizing miniaturization and precision over raw power handling - ideal for portable electronics where PCB real estate and signal fidelity are paramount.
Availability
RKZ3.9B2KJ is available at Aetrix Electronics and suitable for USB interface protection, I²C bus stabilization, and low-power sensor clamping requiring stable component supply, full traceability, and long-term obsolescence management.
Supply support for RKZ3.9B2KJ 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 is a global semiconductor leader specializing in microcontrollers, analog, power, and timing solutions for automotive, industrial, and IoT applications.
The RKZ-KJ Series is part of Renesas' discrete protection portfolio, engineered specifically for surface-mount surge absorption and precision voltage stabilization in space-limited, low-power electronic systems.
FAQ
What is the Zener voltage tolerance of RKZ3.9B2KJ at 5 mA?
The RKZ3.9B2KJ has a guaranteed Zener voltage range of 3.87 V to 4.10 V at test current IZ = 5 mA, representing a ±2.8% tolerance around the nominal 3.9 V rating. This tight specification ensures predictable clamping behavior in 3.3 V system interfaces without requiring calibration or binning. The RKZ3.9B2KJ maintains this tolerance across its qualified operating temperature range.
Does RKZ3.9B2KJ support automated SMT assembly?
Yes, RKZ3.9B2KJ is supplied in embossed taping reel format (PWSF0002ZA-A carrier tape), fully compatible with standard pick-and-place equipment for 0402-class footprints. Its UFP package features consistent coplanarity and terminal geometry, enabling >99.9% placement yield in high-volume manufacturing. The RKZ3.9B2KJ's laser-marked "3·9" identifier also supports automated optical inspection alignment.
How does RKZ3.9B2KJ perform under repeated ESD stress?
RKZ3.9B2KJ is rated for ±30 kV human-body-model (HBM) ESD per IEC 61000-4-2, verified with 10 pulses in both forward and reverse directions. Its silicon planar construction and optimized junction design ensure parametric stability after repeated stress events - no shift in VZ, rd, or IR beyond spec limits. This makes RKZ3.9B2KJ suitable for end-product interfaces subject to frequent user handling, such as RKZ3.9B2KJ-equipped USB ports or touch-button circuits.
Can RKZ3.9B2KJ be used as a voltage reference in precision circuits?
RKZ3.9B2KJ is not characterized or specified as a precision voltage reference; it lacks guaranteed temperature coefficient tracking, long-term stability data, or low-noise performance metrics. While its VZ is tightly binned, its −0.04 %/°C tempco and 130 Ω dynamic resistance make it suitable for clamping and coarse stabilization - not for <10 ppm accuracy references. For reference use, dedicated bandgap or buried-Zener ICs are recommended instead of RKZ3.9B2KJ.
What is the maximum ambient temperature for continuous operation of RKZ3.9B2KJ?
RKZ3.9B2KJ supports continuous operation up to +85°C ambient temperature when mounted on a standard FR-4 PCB, based on its 150 mW power derating curve (Fig.3). At 85°C, allowable dissipation drops to ~100 mW. Junction temperature remains within the 150°C absolute maximum limit as long as PCB copper area and airflow meet typical SMT thermal guidelines. Derating must be applied above 25°C per the RKZ3.9B2KJ datasheet's Pd vs. Ta graph.
RKZ3.9B2KJ#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:
- -
RKZ3.9B2KJ#R1 FAQ
1.How can I place an order for RKZ3.9B2KJ#R1 through Aetrix?
Please submit a Request for Quotation (RFQ) for RKZ3.9B2KJ#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 RKZ3.9B2KJ#R1 reliable?
The price and inventory of RKZ3.9B2KJ#R1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RKZ3.9B2KJ#R1 is usually 5 days.
3.What payment methods are accepted for RKZ3.9B2KJ#R1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RKZ3.9B2KJ#R1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RKZ3.9B2KJ#R1?
RKZ3.9B2KJ#R1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RKZ3.9B2KJ#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 RKZ3.9B2KJ#R1?
For technical support, including RKZ3.9B2KJ#R1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RKZ3.9B2KJ#R1 requirements.
6.How does Aetrix verify that RKZ3.9B2KJ#R1 is sourced from the original manufacturer or authorized distributors?
All RKZ3.9B2KJ#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 RKZ3.9B2KJ#R1 meets industry standards.
7.What is the process for return or replacement of RKZ3.9B2KJ#R1?
All RKZ3.9B2KJ#R1 units undergo pre-shipment inspection (PSI). If there is an issue with RKZ3.9B2KJ#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 RKZ3.9B2KJ#R1 part is unused and in its original packaging.
Return procedure for RKZ3.9B2KJ#R1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RKZ3.9B2KJ#R1 Tags
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MM5Z5V1ST1G
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