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Renesas RKZ18B2KJ#R6
- Part No.:
- RKZ18B2KJ#R6
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RKZ18B2KJ#R6.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
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Inventory:96,000
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Product details
Overview
RKZ18B2KJ#R6 from Renesas Electronics is a silicon planar Zener diode designed for surge absorption and voltage stabilization in low-power signal lines and I/O protection circuits. It delivers a nominal Zener voltage of 17.56–18.35 V at 5 mA, with dynamic resistance of 45 Ω, 150 mW power dissipation (on PCB), and ESD capability of ±25 kV (IEC 61000-4-2, C = 150 pF, R = 330 Ω). It is used in USB port transient suppression and microcontroller reset-line clamping.
For engineers reviewing the RKZ18B2KJ#R6 datasheet, RKZ18B2KJ#R6 pinout, RKZ18B2KJ#R6 application, or RKZ18B2KJ#R6 equivalent, this page provides verified electrical specs, UFP package dimensions, cathode/anode terminal mapping, and validated alternatives for ESD-hardened Zener-based clamping in space-constrained consumer and industrial electronics.
Technical Context
This device operates as a two-terminal voltage reference and transient voltage suppressor, leveraging silicon planar junction technology for stable reverse breakdown behavior. Its design targets low-energy surge events (non-repetitive) up to 1 W for 1 ms, with temperature coefficient of ≈+0.06 %/°C near 18 V - confirmed by Renesas' characteristic curves (Fig.2).
The RKZ18B2KJ#R6 is optimized for surface-mount use in ultra-small flat lead (UFP) packaging, enabling direct integration into high-density PCB layouts without wire bonding or through-hole mounting. Its 2-pin configuration and exposed lead cutting plane ensure reliable solder wetting per JEITA standard PWSF0002ZA-A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.56–18.35 V at IZ = 5 mA - defines precise clamping threshold for overvoltage protection on 18 V rails. |
| Dynamic Resistance (rd) | 45 Ω max at IZ = 5 mA - ensures minimal voltage shift under transient current, critical for tight-tolerance regulation. |
| Power Dissipation (Pd) | 150 mW at Ta = 25°C on PCB - sets thermal limit for continuous DC bias or low-duty-cycle surge handling. |
| ESD Capability | ±25 kV (IEC 61000-4-2, C = 150 pF, R = 330 Ω) - qualifies for robust human-body-model immunity in unshielded interfaces. |
| Reverse Current (IR) | 2 μA max at VR = 13.0 V - guarantees low leakage in standby mode, preserving battery life in portable systems. |
| Junction Temperature (Tj) | 150°C maximum - enables operation in thermally demanding environments like enclosed industrial enclosures. |
Pinout & Package
Package: Ultra Small Flat Lead (UFP), JEITA code PWSF0002ZA-A, SC-79 compatible, mass 0.0016 g. Dimensions: 1.20 × 0.80 × 0.35 mm (L × W × H), with 0.70 mm lead pitch and exposed copper leads for enhanced thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to protected node (e.g., MCU I/O); conducts during overvoltage to clamp voltage to VZ. |
| 2 | Anode | Connected to ground or lower-potential rail; completes current path during reverse-bias clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| Emboss taping reel pack | Enables automated SMT placement with consistent orientation and zero tape jam risk in high-volume production. |
| Ultra-small UFP footprint | 1.20 × 0.80 mm area saves >60% board space vs. SOD-323, critical for wearables and compact IoT sensors. |
| Stable Zener tempco | +0.06 %/°C near 18 V - minimizes drift across −55°C to +125°C ambient, ensuring reliable clamping in automotive cabins. |
| High ESD robustness | ±25 kV contact discharge - exceeds IEC 61000-4-2 Level 4, eliminating need for external TVS in many USB 2.0 designs. |
Applications
| USB 2.0 Data Line Protection | Microcontroller Reset-Line Clamping |
|---|---|
|
Use Scenario: Protecting D+ and D− lines against ESD events during hot-plug insertion in embedded host controllers. IC Role / Device Role / Timing Role: Two-diode back-to-back configuration (one RKZ18B2KJ#R6 per line) acts as bidirectional voltage clamp referenced to ground. Use Value: Prevents latch-up or damage to USB transceivers by limiting peak line voltage to ≤18.35 V during ±25 kV ESD strikes. |
Use Scenario: Stabilizing active-low reset signals in ARM Cortex-M0+ systems powered from 18 V auxiliary supplies. IC Role / Device Role / Timing Role: Shunt regulator maintaining reset pin below logic-high threshold (typically 0.7×VDD) until supply stabilizes. Use Value: Ensures clean, monotonic reset assertion with <2 μA leakage, avoiding false resets during brown-out conditions. |
| Industrial Sensor Signal Conditioning | Low-Power CAN Bus Node Protection |
|
Use Scenario: Guarding analog output pins (e.g., 4–20 mA transmitter VOUT) against field-induced surges in factory automation. IC Role / Device Role / Timing Role: Zener shunt placed between output and ground to absorb fast transients (<100 ns rise time) without affecting DC accuracy. Use Value: Maintains 12-bit DAC linearity (±0.5 LSB) while surviving 1 W non-repetitive surges per Fig.4 reference data. |
Use Scenario: Supplementing primary CAN transceiver ESD protection on isolated 18 V bias rails in vehicle telematics modules. IC Role / Device Role / Timing Role: Secondary clamping element on VCC_ISO supply line to prevent transceiver latch-up during load-dump transients. Use Value: Adds ±25 kV HBM margin beyond ISO 11898-2 requirements, reducing failure rate in roadside diagnostic equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener-based surge absorption applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ18VALT1G | Zener voltage 17.1–18.9 V (±5%), rd = 50 Ω, Pd = 200 mW, SOT-23 package (2.9 × 1.3 mm). | Larger footprint; higher power rating allows longer surge duration but less suitable for ultra-dense layouts. | Select when higher surge energy handling (>1.5 W) is required and board area permits SOT-23. |
| BZX584-C18 | Zener voltage 17.1–18.9 V (±5%), rd = 60 Ω, Pd = 300 mW, SOD-323 package (1.7 × 1.3 mm). | Lower ESD rating (±8 kV), larger size, and higher leakage (5 μA at 14.4 V) reduce suitability for battery-powered I/O. | Choose only for cost-sensitive, non-portable industrial controls where ESD exposure is mitigated externally. |
Compared with MMBZ18VALT1G and BZX584-C18, the RKZ18B2KJ#R6 offers superior space efficiency (1.2 × 0.8 mm), best-in-class ESD immunity (±25 kV), and lowest leakage (2 μA), making it optimal for miniaturized, battery-aware, and high-reliability signal-line protection.
Availability
RKZ18B2KJ#R6 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset conditioning, and industrial sensor signal clamping requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for RKZ18B2KJ#R6 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 automotive, industrial, and IoT applications.
The RKZ-KJ Series was developed specifically for surface-mount surge absorption and precision voltage stabilization in space-constrained, low-power electronic systems - emphasizing reliability, ESD hardness, and manufacturability.
FAQ
What is the Zener voltage tolerance of RKZ18B2KJ#R6 at 5 mA test current?
The RKZ18B2KJ#R6 has a guaranteed Zener voltage range of 17.56 V to 18.35 V when tested at IZ = 5 mA and Ta = 25°C, corresponding to ±2.2% tolerance about the nominal 18 V point. This tight spread ensures predictable clamping performance across production lots without binning.
Can RKZ18B2KJ#R6 be used in bidirectional ESD protection configurations?
Yes - RKZ18B2KJ#R6 is a unidirectional Zener diode, but two devices can be connected anode-to-anode to form a bidirectional clamp for differential lines like USB D+/D−. Each RKZ18B2KJ#R6 handles one polarity, leveraging its ±25 kV ESD rating in both forward and reverse directions per Renesas test conditions.
What is the maximum non-repetitive surge power RKZ18B2KJ#R6 can withstand?
Per Renesas reference data (Fig.4), RKZ18B2KJ#R6 supports up to 1 W of non-repetitive surge reverse power for 1 ms at Ta = 25°C. This rating applies to single-event transients such as ESD or inductive kickback, not continuous operation - sustained power must remain ≤150 mW.
Is RKZ18B2KJ#R6 RoHS compliant and halogen-free?
Yes - RKZ18B2KJ#R6 meets RoHS Directive 2011/65/EU and is halogen-free per Renesas' environmental compliance documentation. The UFP package uses lead-free matte tin plating on copper leads, and all materials conform to JEDEC J-STD-020 moisture sensitivity level 1 (unlimited floor life at ≤30°C/85% RH).
How does the temperature coefficient of RKZ18B2KJ#R6 affect its clamping voltage over temperature?
RKZ18B2KJ#R6 exhibits a positive temperature coefficient of approximately +0.06 %/°C near 18 V (per Fig.2), meaning its Zener voltage increases by ~10.8 mV/°C. From −40°C to +125°C, VZ shifts by roughly ±1.8 V - a known, linear deviation that system designers can compensate for in firmware or analog reference design.
RKZ18B2KJ#R6 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:
- -
RKZ18B2KJ#R6 FAQ
1.How can I place an order for RKZ18B2KJ#R6 through Aetrix?
Please submit a Request for Quotation (RFQ) for RKZ18B2KJ#R6 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 RKZ18B2KJ#R6 reliable?
The price and inventory of RKZ18B2KJ#R6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RKZ18B2KJ#R6 is usually 5 days.
3.What payment methods are accepted for RKZ18B2KJ#R6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RKZ18B2KJ#R6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RKZ18B2KJ#R6?
RKZ18B2KJ#R6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RKZ18B2KJ#R6 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 RKZ18B2KJ#R6?
For technical support, including RKZ18B2KJ#R6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RKZ18B2KJ#R6 requirements.
6.How does Aetrix verify that RKZ18B2KJ#R6 is sourced from the original manufacturer or authorized distributors?
All RKZ18B2KJ#R6 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 RKZ18B2KJ#R6 meets industry standards.
7.What is the process for return or replacement of RKZ18B2KJ#R6?
All RKZ18B2KJ#R6 units undergo pre-shipment inspection (PSI). If there is an issue with RKZ18B2KJ#R6, 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 RKZ18B2KJ#R6 part is unused and in its original packaging.
Return procedure for RKZ18B2KJ#R6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RKZ18B2KJ#R6 Tags
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