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Renesas RKZ18B2KJ#R1
- Part No.:
- RKZ18B2KJ#R1
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RKZ18B2KJ#R1.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:112,000
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Product details
Overview
RKZ18B2KJ from Renesas Electronics is a silicon planar Zener diode designed for surge absorption and voltage stabilization in low-power signal and bias circuits, featuring a nominal Zener voltage of 17.56–18.35 V at 5 mA, 2 mW reverse leakage at 13.0 V, 45 Ω dynamic resistance, 150 mW power dissipation on PCB, and ESD capability of ±25 kV (HBM).
For engineers reviewing the RKZ18B2KJ datasheet, RKZ18B2KJ pinout, RKZ18B2KJ application, or RKZ18B2KJ equivalent, this device serves as a precision clamping element in I/O protection, reference voltage generation, and transient suppression where tight voltage tolerance, low dynamic impedance, and ultra-small surface-mount packaging are required.
Technical Context
This Zener diode operates in reverse breakdown mode with stable regulation across ambient temperatures from −55°C to +150°C and junction temperature up to 150°C. Its UFP (Ultra small Flat Lead Package) enables high-density PCB layout while maintaining thermal performance under pulsed surge conditions.
The device exhibits a positive temperature coefficient of approximately +0.06 %/°C near 18 V, confirmed by Figure 2 of the datasheet, and supports nonrepetitive surge reverse power up to ~1.0 W for 1 ms (per Figure 4 reference curve), making it suitable for transient overvoltage events in sensor interfaces and microcontroller I/O lines.
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 18 V rail protection or reference |
| Reverse Leakage (IR) | ≤2 μA at VR = 13.0 V - ensures minimal standby current in always-on bias networks |
| Dynamic Resistance (rd) | 45 Ω at IZ = 5 mA - delivers stable regulation against load or supply variation |
| Power Dissipation (Pd) | 150 mW on PCB - sets maximum continuous DC or low-duty-cycle pulse handling capacity |
| ESD Capability | ±25 kV HBM (C = 150 pF, R = 330 Ω) - provides robust I/O-level electrostatic discharge immunity |
| Junction Temperature (Tj) | 150°C maximum - supports operation in thermally constrained industrial or automotive cabin environments |
| Package | UFP (SC-79) - 1.7 × 1.2 × 0.6 mm footprint ideal for space-constrained portable and sensor modules |
Pinout & Package
Package: Ultra small Flat Lead Package (UFP), JEITA code PWSF0002ZA-A, SC-79 compliant, mass 0.0016 g. Dimensions: 1.70 mm (L) × 1.20 mm (W) × 0.60 mm (H), with cathode marked on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to higher-potential node during Zener operation; polarity mark location on package top |
| 2 | Anode | Connected to lower-potential node (e.g., GND or reference); forms reverse-biased junction for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Emboss taping reel packaging | Enables automated SMT placement with consistent orientation and zero tape jam risk |
| Ultra-small UFP footprint | 1.7 × 1.2 mm area reduces PCB real estate by >40% vs. SOD-323 in comparable Zener ratings |
| Tight VZ tolerance | ±2.2% at 18 V (17.56–18.35 V) improves accuracy of voltage references without trimming |
| High ESD robustness | 25 kV HBM rating eliminates need for external TVS in many Class A I/O protection designs |
| Low dynamic impedance | 45 Ω at 5 mA maintains <±15 mV output shift under ±1 mA load transients |
Applications
| Industrial Sensor Signal Conditioning | Microcontroller I/O Protection |
|---|---|
Use Scenario: Stabilizing bias voltage for analog front-end op-amps in 4–20 mA loop transmitters operating at 18 V supply. IC Role / Device Role / Timing Role: Precision shunt reference and overvoltage clamp for ADC driver stage. Use Value: Maintains ±0.5% reference stability over −40°C to +85°C due to predictable tempco and low rd. |
Use Scenario: Protecting GPIO pins of ARM Cortex-M0+ MCUs against ESD and cable-induced surges in smart building controllers. IC Role / Device Role / Timing Role: Fast-acting bidirectional clamp limiting pin voltage to ≤18.5 V during transients. Use Value: Withstands ≥25 kV contact discharge per IEC 61000-4-2 without degradation, eliminating secondary TVS. |
| Low-Power Reference Voltage Source | Surge-Protected RS-485 Bias Network |
Use Scenario: Generating stable 18 V reference for DAC output buffers in battery-powered portable test equipment. IC Role / Device Role / Timing Role: Shunt regulator providing low-noise, low-drift bias independent of supply ripple. Use Value: 2 μA max reverse leakage at 13 V minimizes quiescent current draw in sleep mode. |
Use Scenario: Clamping common-mode voltage drift in RS-485 transceiver bias resistors exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional surge limiter placed across termination resistors to absorb differential-mode energy. Use Value: 1.0 W nonrepetitive surge rating (1 ms) handles induced transients without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55-C18 (ON Semiconductor) | Through-hole DO-35 package; ±5% VZ tolerance; 500 mW Pd; no HBM rating specified | Requires PCB hole drilling; less suitable for high-density layouts or automated assembly | Select when higher power handling is needed and board space allows through-hole mounting |
| MMSZ5245B (Diodes Inc.) | SOD-123 package; ±5% VZ; 350 mW Pd; 30 kV HBM; 20 Ω rd at 20 mA | Larger footprint (2.7 × 1.4 mm); lower dynamic impedance but looser voltage tolerance | Choose for tighter regulation at higher currents, accepting larger size and reduced VZ precision |
Compared with BZX55-C18 and MMSZ5245B, RKZ18B2KJ offers superior voltage accuracy (±2.2% vs. ±5%), smallest footprint (UFP), and guaranteed 25 kV HBM-making it optimal for miniaturized, high-reliability I/O protection where precision and space are critical.
Availability
RKZ18B2KJ is available at Aetrix Electronics and suitable for industrial sensor conditioning, microcontroller I/O protection, low-power reference voltage sources, and surge-protected RS-485 bias networks requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for RKZ18B2KJ 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 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-precision voltage stabilization and surge absorption in space-constrained, low-power electronic systems.
FAQ
What is the Zener voltage tolerance of RKZ18B2KJ?
The RKZ18B2KJ has a Zener voltage range of 17.56 V to 18.35 V at 5 mA test current, corresponding to a ±2.2% tolerance around the nominal 18 V rating. This tight tolerance is confirmed in the Electrical Characteristics table on page 2 of the REJ03G1588-0100 datasheet and enables accurate voltage referencing without external calibration for RKZ18B2KJ-based designs.
Does RKZ18B2KJ support automated SMT assembly?
Yes, RKZ18B2KJ is supplied in emboss taping reel format compatible with standard pick-and-place equipment. Its UFP (SC-79) package features consistent orientation and mechanical stability during feeding, and the datasheet explicitly states "Emboss Taping Reel Pack" as a key feature-ensuring reliable, high-yield placement for RKZ18B2KJ in volume manufacturing.
What is the maximum surge power RKZ18B2KJ can handle?
RKZ18B2KJ supports nonrepetitive surge reverse power up to approximately 1.0 W for 1 ms duration, as shown in Figure 4 ("Surge Reverse Power Ratings") of the datasheet. This capability is derived from its thermal mass and UFP package construction, enabling RKZ18B2KJ to absorb transient energy in I/O lines without failure under defined pulse conditions.
Is RKZ18B2KJ RoHS compliant and lead-free?
Yes, RKZ18B2KJ meets RoHS Directive 2011/65/EU requirements. Renesas confirms lead-free plating and halogen-free materials in the UFP package per their environmental compliance documentation, and the device carries the standard RoHS marking. This ensures RKZ18B2KJ is suitable for environmentally regulated commercial and industrial applications.
How does the temperature coefficient affect RKZ18B2KJ performance?
RKZ18B2KJ exhibits a positive temperature coefficient of approximately +0.06 %/°C near 18 V, as plotted in Figure 2 of the datasheet. This means its Zener voltage increases by ~10.8 mV per °C rise-enabling predictable drift compensation in reference circuits and confirming stable behavior across −55°C to +150°C operating range for RKZ18B2KJ deployments.
RKZ18B2KJ#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:
- -
RKZ18B2KJ#R1 FAQ
1.How can I place an order for RKZ18B2KJ#R1 through Aetrix?
Please submit a Request for Quotation (RFQ) for RKZ18B2KJ#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 RKZ18B2KJ#R1 reliable?
The price and inventory of RKZ18B2KJ#R1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RKZ18B2KJ#R1 is usually 5 days.
3.What payment methods are accepted for RKZ18B2KJ#R1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RKZ18B2KJ#R1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RKZ18B2KJ#R1?
RKZ18B2KJ#R1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RKZ18B2KJ#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 RKZ18B2KJ#R1?
For technical support, including RKZ18B2KJ#R1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RKZ18B2KJ#R1 requirements.
6.How does Aetrix verify that RKZ18B2KJ#R1 is sourced from the original manufacturer or authorized distributors?
All RKZ18B2KJ#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 RKZ18B2KJ#R1 meets industry standards.
7.What is the process for return or replacement of RKZ18B2KJ#R1?
All RKZ18B2KJ#R1 units undergo pre-shipment inspection (PSI). If there is an issue with RKZ18B2KJ#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 RKZ18B2KJ#R1 part is unused and in its original packaging.
Return procedure for RKZ18B2KJ#R1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RKZ18B2KJ#R1 Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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