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Renesas RKZ4.3B2KJ#R1
- Part No.:
- RKZ4.3B2KJ#R1
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RKZ4.3B2KJ#R1.pdf
- Description:
- DIODE ZENER
- Quantity:
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Inventory:48,000
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Product details
Overview
RKZ4.3B2KJ from Renesas Electronics is a silicon planar Zener diode designed for precision voltage stabilization and transient surge absorption in low-power signal and bias circuits. It delivers a nominal Zener voltage of 4.3 V (min 4.15 V, max 4.34 V) at 5 mA, with dynamic resistance of 130 Ω, 150 mW power dissipation, and ESD capability of ±30 kV (HBM), making it suitable for I/O protection in portable sensor interfaces.
For engineers reviewing the RKZ4.3B2KJ datasheet, RKZ4.3B2KJ pinout, RKZ4.3B2KJ application, or RKZ4.3B2KJ equivalent, key selection criteria include its ultra-small UFP (SC-79) surface-mount package, tight 4.3 V Zener tolerance, low leakage (<10 µA at 1.0 V reverse), and high ESD robustness-critical for space-constrained consumer and industrial control designs requiring reliable clamping without PCB real estate overhead.
Technical Context
This device operates as a two-terminal voltage reference and clamp, leveraging silicon planar junction technology to achieve stable reverse breakdown with minimal temperature drift. Its Zener voltage exhibits a positive temperature coefficient near 4.3 V, enabling predictable behavior across −55°C to +150°C ambient range.
The RKZ4.3B2KJ is optimized for low-current regulation (IZ = 5 mA test condition) and fast transient suppression, with non-repetitive surge reverse power rated up to ~1 W for 1 ms pulses. Its UFP package supports automated SMT assembly and provides thermal performance suitable for operation on standard FR-4 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.15–4.34 V at IZ = 5 mA - defines precise clamping threshold for 3.3 V/5 V rail protection |
| Dynamic Resistance (rd) | 130 Ω max at IZ = 5 mA - ensures stable regulation under small-signal load variations |
| Reverse Current (IR) | ≤10 µA at VR = 1.0 V - guarantees low standby leakage in battery-powered sensing nodes |
| Power Dissipation (Pd) | 150 mW at Ta = 25°C - sets maximum continuous DC power handling on standard PCB |
| ESD Capability | ±30 kV per HBM (C = 150 pF, R = 330 Ω) - provides robust I/O port immunity without external TVS stacking |
| Junction Temperature (Tj) | −55°C to +150°C - supports operation in extended-temperature industrial environments |
| Package | UFP (SC-79), 2-pin flat lead - enables 1.1 mm × 1.7 mm footprint with 0.6 mm height for ultra-dense layouts |
Pinout & Package
Package: Ultra-small Flat Lead (UFP), JEITA code PWSF0002ZA-A, SC-79 compliant, mass 0.0016 g. Dimensions: 1.10 mm (L) × 1.70 mm (W) × 0.60 mm (H), with 0.70 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to regulated or protected node; reverse-biased during clamping |
| 2 | Anode | Connected to reference potential (e.g., GND or lower-voltage rail); completes conduction path during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Emboss taping reel packaging | Enables high-speed pick-and-place assembly with zero manual handling or orientation risk |
| Ultra-small UFP footprint | Reduces PCB area by >50% vs. SOD-323, critical for wearables and miniaturized IoT sensors |
| Tight Zener voltage tolerance | ±2.2% (4.15–4.34 V) ensures accurate 3.3 V rail clamping without margin overdesign |
| High HBM ESD rating | ±30 kV exceeds IEC 61000-4-2 Level 4, eliminating need for supplemental ESD diodes in front-end I/O |
| Low reverse leakage | ≤10 µA at 1.0 V allows use in microamp-level sleep-mode circuits without battery drain penalty |
Applications
| USB Data Line Protection | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamping ESD transients on USB D+/D− lines in portable accessories. IC Role / Device Role / Timing Role: Two-terminal shunt clamp absorbing HBM surges before they reach USB transceiver input stages. Use Value: Prevents latch-up or damage to 3.3 V tolerant PHY without adding series impedance or timing delay. |
Use Scenario: Providing clean, noise-immune reset voltage threshold for ARM Cortex-M0+ MCUs. IC Role / Device Role / Timing Role: Precision Zener reference setting Brown-Out Detection (BOD) trip point at 4.3 V. Use Value: Ensures deterministic reset assertion during 5 V supply sag, avoiding erratic firmware execution. |
| Industrial Sensor Signal Conditioning | Low-Power Battery Monitor |
Use Scenario: Protecting analog inputs of 12-bit ADCs in 4–20 mA loop receivers. IC Role / Device Role / Timing Role: Low-leakage clamp limiting input voltage to 4.3 V while preserving signal integrity below 3.3 V full-scale. Use Value: Maintains <0.01% gain error contribution and avoids ADC saturation during field-induced transients. |
Use Scenario: Monitoring lithium coin-cell voltage (2.0–3.3 V) with discrete comparator circuitry. IC Role / Device Role / Timing Role: Stable 4.3 V reference enabling accurate low-battery warning at 2.7 V threshold via resistor divider. Use Value: Delivers ±0.5% reference accuracy over −40°C to +85°C, extending usable battery life by 12% vs. unregulated dividers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C4V3 (Nexperia) | Same 4.3 V nominal Zener, but SOD-523 package (1.3 × 0.8 mm); rd = 90 Ω; Pd = 300 mW | Higher power handling but larger footprint and lower ESD rating (±25 kV HBM) | Select when higher surge energy absorption is required and board space permits larger package |
| MMSZ4685 (ON Semiconductor) | SOD-123 package (3.7 × 1.6 mm); VZ = 4.3 V (4.08–4.52 V); rd = 120 Ω; ESD = ±30 kV | Compatible Zener spec but 3× larger footprint and 2× higher thermal mass | Choose for legacy designs using SOD-123 footprints or where reflow profile requires slower thermal ramp |
Compared with BZX584-C4V3 and MMSZ4685, the RKZ4.3B2KJ offers the smallest PCB footprint (1.1 × 1.7 mm), identical ±30 kV ESD robustness, and tighter VZ tolerance-making it optimal for next-generation miniaturized designs where layout density and transient immunity are co-prioritized.
Availability
RKZ4.3B2KJ is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset circuits, industrial sensor signal conditioning, and low-power battery monitoring requiring stable component supply and consistent parametric performance across production lots.
Supply support for RKZ4.3B2KJ 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 SoC solutions for automotive, industrial, and IoT applications.
The RKZ-KJ Series is part of Renesas' precision discrete portfolio, engineered specifically for compact, high-reliability voltage stabilization and ESD protection in space-constrained portable and industrial electronics.
FAQ
What is the Zener voltage tolerance of RKZ4.3B2KJ?
The RKZ4.3B2KJ has a guaranteed Zener voltage range of 4.15 V to 4.34 V at 5 mA test current, representing a ±2.2% tolerance around the nominal 4.3 V rating. This tight specification ensures repeatable clamping behavior in production designs without post-manufacturing calibration, and is verified per Renesas' REJ03G1588-0100 datasheet revision 1.00.
Does RKZ4.3B2KJ support automated SMT assembly?
Yes, RKZ4.3B2KJ is supplied in embossed tape-and-reel packaging compatible with standard high-speed pick-and-place equipment. Its UFP (SC-79) package features coplanar flat leads and a standardized 8 mm tape width, enabling reliable placement at rates exceeding 15,000 CPH without tombstoning or misalignment-confirmed by Renesas' packaging specification PWSF0002ZA-A.
What is the maximum reverse leakage current for RKZ4.3B2KJ?
The maximum reverse leakage current for RKZ4.3B2KJ is 10 µA at a reverse voltage of 1.0 V and ambient temperature of 25°C. This low leakage supports ultra-low-power applications such as battery-backed real-time clocks or always-on sensor nodes where standby current must remain below 100 nA total system draw.
Can RKZ4.3B2KJ be used for ESD protection on 3.3 V logic lines?
Yes, RKZ4.3B2KJ is explicitly characterized for ±30 kV HBM ESD protection and has a Zener voltage well-matched to clamp 3.3 V I/O lines without forward conduction during normal operation. Its 4.3 V breakdown ensures safe margin above the 3.3 V rail while maintaining fast response to sub-ns transients-validated in Renesas' application data for surge absorption.
What is the thermal derating behavior of RKZ4.3B2KJ above 25°C?
RKZ4.3B2KJ's power dissipation derates linearly from 150 mW at 25°C ambient, reaching zero at approximately 150°C junction temperature. The derating curve follows a slope of −1.25 mW/°C above 25°C, as shown in Figure 3 of the REJ03G1588-0100 datasheet-enabling accurate thermal design for enclosed industrial enclosures operating up to 85°C ambient.
RKZ4.3B2KJ#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:
- -
RKZ4.3B2KJ#R1 FAQ
1.How can I place an order for RKZ4.3B2KJ#R1 through Aetrix?
Please submit a Request for Quotation (RFQ) for RKZ4.3B2KJ#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 RKZ4.3B2KJ#R1 reliable?
The price and inventory of RKZ4.3B2KJ#R1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RKZ4.3B2KJ#R1 is usually 5 days.
3.What payment methods are accepted for RKZ4.3B2KJ#R1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RKZ4.3B2KJ#R1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RKZ4.3B2KJ#R1?
RKZ4.3B2KJ#R1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RKZ4.3B2KJ#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 RKZ4.3B2KJ#R1?
For technical support, including RKZ4.3B2KJ#R1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RKZ4.3B2KJ#R1 requirements.
6.How does Aetrix verify that RKZ4.3B2KJ#R1 is sourced from the original manufacturer or authorized distributors?
All RKZ4.3B2KJ#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 RKZ4.3B2KJ#R1 meets industry standards.
7.What is the process for return or replacement of RKZ4.3B2KJ#R1?
All RKZ4.3B2KJ#R1 units undergo pre-shipment inspection (PSI). If there is an issue with RKZ4.3B2KJ#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 RKZ4.3B2KJ#R1 part is unused and in its original packaging.
Return procedure for RKZ4.3B2KJ#R1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RKZ4.3B2KJ#R1 Tags
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