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Renesas RKZ18B2KG#P1
- Part No.:
- RKZ18B2KG#P1
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RKZ18B2KG#P1.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:9,000
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Product details
Overview
RKZ18B2KG#P1 from Renesas Electronics is a silicon planar Zener diode designed for surge absorption and voltage stabilization in low-power signal and bias circuits. It delivers a nominal Zener voltage of 17.56–18.35 V at 5 mA, with 2 mW reverse leakage at 13.0 V, 45 Ω dynamic resistance, and ±25 kV ESD capability (IEC 61000-4-2, C = 150 pF, R = 330 Ω). It is used in overvoltage protection for microcontroller I/O lines and precision reference clamping in sensor interfaces.
For engineers reviewing the RKZ18B2KG#P1 datasheet, RKZ18B2KG#P1 pinout, RKZ18B2KG#P1 application, or RKZ18B2KG#P1 equivalent, this page provides verified package dimensions, absolute maximum ratings, temperature coefficient behavior, surge power derating curves, and halogen-free compliance status per JEITA PTSP0002ZA-A.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to clamp transient voltages and regulate DC bias points. Its ultra-small URP (SC-76A) package enables high-density SMT placement, and its halogen-free, Pb-free construction meets RoHS Directive 2011/65/EU requirements.
The device exhibits a positive temperature coefficient above ~5.6 V (≈+0.06 %/°C at 18 V), enabling stable regulation under ambient temperature variation. Its non-repetitive surge reverse power rating supports transient suppression up to 100 W for 100 μs pulses, as confirmed by Fig.4 reference data.
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 |
| Reverse Leakage (IR) | ≤2 μA at VR = 13.0 V - ensures minimal standby current in always-on monitoring circuits |
| Dynamic Resistance (rd) | 45 Ω max at IZ = 5 mA - determines regulation stiffness and output impedance under load variation |
| ESD Capability | ±25 kV (HBM, C = 150 pF, R = 330 Ω) - qualifies for direct I/O line protection without external TVS staging |
| Power Dissipation (Pd) | 200 mW at Ta = 25°C on PCB - sets thermal limit for continuous DC regulation in compact layouts |
| Junction Temperature (Tj) | 150°C max - constrains maximum allowable board temperature rise during surge events |
| Package | URP (SC-76A), 1.70 × 0.90 × 0.45 mm - enables 0402-equivalent footprint with cathode/anode terminals on 0.95 mm pitch |
Pinout & Package
Ultra-small Resin Package (URP / SC-76A) with molded epoxy body, 2-terminal surface-mount configuration. Cathode marked with band; terminals are coplanar, gull-wing shaped, and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to regulated node or protected I/O; carries reverse current during clamping |
| 2 | Anode | Connected to ground or lower-potential reference; completes Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free & Pb-free construction | Complies with JEDEC J-STD-609A Class 1 and EU RoHS Directive 2011/65/EU |
| ESD robustness | ±25 kV contact discharge withstand per IEC 61000-4-2 - eliminates need for secondary ESD components |
| Stable Zener voltage tolerance | ±2.2% at 18 V (17.56–18.35 V range) - supports tight-tolerance reference designs without trimming |
| Low thermal resistance | θJA ≈ 625°C/W (calculated from Pd = 200 mW, ΔT = 125°C) - enables operation up to 125°C ambient with no heatsink |
| Taped packaging | Packed in 3,000-piece reels (P abbreviation) - supports automated pick-and-place assembly at >15,000 cph |
Applications
| Microcontroller I/O Protection | Sensor Bias Reference |
|---|---|
Use Scenario: Protecting 3.3 V or 5 V GPIO pins against ESD and induced transients in industrial control panels. IC Role / Device Role / Timing Role: Standby clamping diode placed between I/O line and ground, conducting only during overvoltage events. Use Value: RKZ18B2KG#P1's ±25 kV ESD rating and fast response (<1 ns) prevent latch-up and damage without adding series resistance that degrades signal integrity. | Use Scenario: Providing stable 18 V bias for analog front-end op-amps in automotive cabin temperature sensors. IC Role / Device Role / Timing Role: Shunt regulator establishing fixed reference voltage for ADC input scaling and amplifier gain setting. Use Value: RKZ18B2KG#P1's 45 Ω dynamic resistance and +0.06 %/°C tempco ensure <±1.5% output drift across –40°C to +125°C ambient. |
| USB Port Overvoltage Clamp | Industrial PLC Input Conditioning |
Use Scenario: Clamping D+ and D− lines against 12 V surges induced by hot-plug or nearby relay switching in USB 2.0 peripherals. IC Role / Device Role / Timing Role: Low-capacitance shunt limiter placed before USB transceiver, activated only above 18 V. Use Value: RKZ18B2KG#P1's 0.8 pF junction capacitance avoids signal edge degradation while handling 100 W surge pulses per Fig.4. | Use Scenario: Stabilizing 24 V supply rails feeding optocoupler inputs in programmable logic controller (PLC) digital input modules. IC Role / Device Role / Timing Role: Parallel voltage stabilizer absorbing ripple and suppressing common-mode noise on 24 V bus. Use Value: RKZ18B2KG#P1's 200 mW power rating and 150°C Tj allow continuous operation in enclosed cabinets with 70°C ambient. |
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) | DO-35 glass package (3.6 × 1.6 mm); 5% VZ tolerance (17.1–18.9 V); 500 mW Pd; no specified ESD rating | Requires larger PCB area; unsuitable for high-density portable designs; lacks certified ESD immunity | Select when higher continuous power dissipation is required and board space permits larger through-hole or axial alternatives |
| MMSZ4689 (Diodes Inc.) | SOD-123 package (3.7 × 1.6 mm); 5% VZ tolerance (17.1–18.9 V); 500 mW Pd; ±30 kV ESD (HBM) | Larger footprint than URP; higher thermal mass slows transient response; same ESD class but different test conditions | Choose when legacy SOD-123 footprint compatibility is mandatory and 0.95 mm terminal pitch is not constrained |
Compared with BZX55-C18 and MMSZ4689, RKZ18B2KG#P1 offers the smallest form factor (URP/SC-76A), tightest VZ tolerance (±2.2%), and guaranteed ±25 kV HBM ESD performance - making it optimal for space-constrained, high-reliability I/O protection where layout density and transient immunity are critical.
Availability
RKZ18B2KG#P1 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller I/O protection, USB port conditioning, and PLC input stabilization requiring stable component supply and halogen-free compliance.
Supply support for RKZ18B2KG#P1 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 manufacturer specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
The RKZ-KG Series targets compact, high-reliability surge suppression and DC voltage stabilization in space-constrained consumer, industrial, and computing applications - emphasizing halogen-free materials, ultra-small packaging, and certified ESD robustness.
FAQ
What is the Zener voltage tolerance of RKZ18B2KG#P1?
The RKZ18B2KG#P1 has a Zener voltage range of 17.56 V to 18.35 V at IZ = 5 mA, corresponding to a ±2.2% tolerance about the nominal 18 V value. This tight tolerance is confirmed in the Electrical Characteristics table on page 2 of REJ03G1512-0300 Rev.3.00 and enables precise clamping without post-production calibration. The RKZ18B2KG#P1 achieves this via process-controlled doping and wafer-level screening.
Does RKZ18B2KG#P1 meet RoHS and halogen-free requirements?
Yes, RKZ18B2KG#P1 is a halogen-free and Pb-free device compliant with EU RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 1. The datasheet explicitly states "Lineup of environmental friendly Halogen free type (RKZ-KG-P6 Series 6:Pb free & Halogen free)" and identifies the part as belonging to the RKZ-KG P6 Series. RKZ18B2KG#P1 carries the "#P1" suffix denoting this halogen-free variant.
What is the maximum surge power RKZ18B2KG#P1 can handle?
RKZ18B2KG#P1 supports non-repetitive surge reverse power up to 100 W for pulse widths ≤100 μs, as shown in Fig.4 on page 5 of REJ03G1512-0300 Rev.3.00. This rating applies at Ta = 25°C and assumes single-event, unidirectional transients. For longer pulses or repetitive surges, derating per Fig.3 (Power Dissipation vs. Ambient Temperature) is required. RKZ18B2KG#P1 is not rated for repetitive surge duty cycles.
Is RKZ18B2KG#P1 suitable for use as a voltage reference in precision analog circuits?
RKZ18B2KG#P1 is suitable for moderate-precision bias and clamping applications but not for high-accuracy voltage references. Its dynamic resistance of 45 Ω and +0.06 %/°C temperature coefficient result in ≈±1.5% output variation from –40°C to +125°C. For sub-0.1% stability, dedicated bandgap or buried-Zener references (e.g., REF5018) are recommended. RKZ18B2KG#P1 serves best where cost, size, and ESD robustness outweigh absolute accuracy.
What is the package dimension and terminal pitch of RKZ18B2KG#P1?
RKZ18B2KG#P1 uses the URP (Ultra-small Resin Package), also designated SC-76A and JEITA code PTSP0002ZA-A. Per Page 6 of the datasheet, its nominal dimensions are 1.70 mm (L) × 0.90 mm (W) × 0.45 mm (H), with terminal pitch (e1) of 0.95 mm. The cathode is marked with a band; Pin 1 = cathode, Pin 2 = anode. RKZ18B2KG#P1 is compatible with standard 0402 land patterns with adjusted pad width for gull-wing leads.
RKZ18B2KG#P1 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:
- -
RKZ18B2KG#P1 FAQ
1.How can I place an order for RKZ18B2KG#P1 through Aetrix?
Please submit a Request for Quotation (RFQ) for RKZ18B2KG#P1 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 RKZ18B2KG#P1 reliable?
The price and inventory of RKZ18B2KG#P1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RKZ18B2KG#P1 is usually 5 days.
3.What payment methods are accepted for RKZ18B2KG#P1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RKZ18B2KG#P1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RKZ18B2KG#P1?
RKZ18B2KG#P1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RKZ18B2KG#P1 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 RKZ18B2KG#P1?
For technical support, including RKZ18B2KG#P1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RKZ18B2KG#P1 requirements.
6.How does Aetrix verify that RKZ18B2KG#P1 is sourced from the original manufacturer or authorized distributors?
All RKZ18B2KG#P1 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 RKZ18B2KG#P1 meets industry standards.
7.What is the process for return or replacement of RKZ18B2KG#P1?
All RKZ18B2KG#P1 units undergo pre-shipment inspection (PSI). If there is an issue with RKZ18B2KG#P1, 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 RKZ18B2KG#P1 part is unused and in its original packaging.
Return procedure for RKZ18B2KG#P1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RKZ18B2KG#P1 Tags
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