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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Renesas RKZ5.1B2KG#P1

Name: RKZ5.1B2KG#P1
Brand: Renesas
SKU: RKZ5.1B2KG#P1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RKZ5.1B2KG#P1

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: -

Datasheet:: RKZ5.1B2KG#P1.pdf

Description:: DIODE ZENER

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Product details

Overview

RKZ5.1B2KG#P1 from Renesas Electronics is a silicon planar Zener diode optimized for surge absorption and voltage stabilization in low-power signal and supply rail protection circuits, with a nominal Zener voltage of 5.1 V (4.98–5.20 V), 5 μA maximum reverse current at 1.5 V, 130 Ω dynamic resistance at 5 mA, and 200 mW power dissipation on PCB - deployed in compact consumer power management and I/O interface ESD clamping.

For engineers reviewing the RKZ5.1B2KG#P1 datasheet, RKZ5.1B2KG#P1 pinout, RKZ5.1B2KG#P1 application, or RKZ5.1B2KG#P1 equivalent, this page delivers verified electrical specs, URP package dimensions, cathode/anode terminal mapping, ESD robustness (±30 kV per IEC 61000-4-2), and direct alternative options for low-voltage rail clamping and precision reference use cases.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage under transient overvoltage conditions, with temperature coefficient near zero at 5.1 V (per Fig.2), enabling reliable reference and clamp performance across –55°C to +150°C ambient range. Its ultra-small resin package (URP, SC-76A) supports high-density SMT layouts without thermal derating penalties up to 70°C.

Designed for non-repetitive surge suppression, RKZ5.1B2KG#P1 sustains up to 1 W peak reverse power for 100 ms (Fig.4), while maintaining <5 μA leakage below 1.5 V - critical for battery-backed and low-quiescent systems where standby current integrity is essential.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.98–5.20 V at 5 mA - ensures ±2% regulation tolerance for 5 V rail stabilization and logic-level clamping.
Reverse Current (I_R)	≤5 μA at V_R = 1.5 V - guarantees minimal leakage in always-on monitoring circuits and battery-sensitive designs.
Dynamic Resistance (r_d)	130 Ω at I_Z = 5 mA - provides predictable impedance during transient suppression, supporting consistent clamping behavior.
Power Dissipation (P_d)	200 mW on PCB - enables operation without heatsinking in space-constrained consumer and industrial PCBs.
ESD Capability	±30 kV (HBM, C = 150 pF, R = 330 Ω) - meets IEC 61000-4-2 Level 4 for robust front-end I/O protection.
Junction Temperature (T_j)	150°C max - allows sustained operation in thermally demanding environments such as enclosed power adapters.
Package	URP (SC-76A, PTSP0002ZA-A) - 1.70 × 0.80 × 0.45 mm footprint ideal for 0402-class board area constraints.

Pinout & Package

Ultra-small Resin Package (URP, JEITA code SC-76A) with surface-mount terminals: 1.0 mm pitch, 0.45 mm height, and 0.004 g mass. Cathode marked with band; anode unmarked.

Pin/Terminal	Circuit Role	Design Meaning
1	Cathode	Connected to regulated or clamped node; reverse-biased voltage reference terminal.
2	Anode	Ground or low-side return path; defines polarity for Zener conduction direction.

Key Features

Feature	Design Value
Halogen-free & Pb-free construction	Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 1 moisture sensitivity.
Taped packaging	3,000 pcs/reel (P taping abbreviation) - compatible with high-speed pick-and-place assembly.
Zero-TC Zener point	Temperature coefficient near 0 mV/°C at 5.1 V (Fig.2) - minimizes drift in precision reference applications.
Surge-rated reverse power	1 W non-repetitive PRSM for 100 ms (Fig.4) - handles common-mode transients in USB, UART, and sensor interfaces.
Low-profile mounting	0.45 mm max height - enables stacking under shields or integration into ultra-thin portable electronics.

Applications

USB Interface Protection	Microcontroller I/O Clamp
Use Scenario: Clamping ESD events on USB D+/D− lines before they reach the PHY or controller. IC Role / Device Role / Timing Role: Passive bidirectional voltage clamp limiting line voltage to ≤5.2 V during ±8 kV contact discharge. Use Value: Prevents latch-up and gate oxide damage in 5 V-tolerant USB transceivers without adding series resistance or propagation delay.	Use Scenario: Protecting GPIO pins of ARM Cortex-M microcontrollers against overvoltage from external sensors or switches. IC Role / Device Role / Timing Role: Low-leakage shunt element that activates only above 5.2 V, preserving signal integrity below threshold. Use Value: Maintains <5 μA standby leakage at 1.5 V, extending battery life in always-on wake-up circuits.
5 V Power Rail Stabilization	Low-Cost Reference for ADC
Use Scenario: Providing stable 5.1 V bias for op-amps or comparators in cost-sensitive power supply feedback paths. IC Role / Device Role / Timing Role: Two-terminal voltage reference with ±2% initial tolerance and <100 ppm/°C drift near room temperature. Use Value: Eliminates need for 3-pin adjustable references in non-critical analog subsystems, reducing BOM count and layout area.	Use Scenario: Supplying reference voltage to 10-bit SAR ADCs in industrial sensor nodes where absolute accuracy is secondary to stability. IC Role / Device Role / Timing Role: Low-noise, low-drift Zener source delivering 5.1 V ±2% with 130 Ω output impedance. Use Value: Enables ratiometric measurement without external buffer, cutting component count and power consumption by 30% vs. buffered bandgap solutions.

USB Interface Protection

Microcontroller I/O Clamp

Use Scenario: Clamping ESD events on USB D+/D− lines before they reach the PHY or controller.

IC Role / Device Role / Timing Role: Passive bidirectional voltage clamp limiting line voltage to ≤5.2 V during ±8 kV contact discharge.

Use Value: Prevents latch-up and gate oxide damage in 5 V-tolerant USB transceivers without adding series resistance or propagation delay.

Use Scenario: Protecting GPIO pins of ARM Cortex-M microcontrollers against overvoltage from external sensors or switches.

IC Role / Device Role / Timing Role: Low-leakage shunt element that activates only above 5.2 V, preserving signal integrity below threshold.

Use Value: Maintains <5 μA standby leakage at 1.5 V, extending battery life in always-on wake-up circuits.

5 V Power Rail Stabilization

Low-Cost Reference for ADC

Use Scenario: Providing stable 5.1 V bias for op-amps or comparators in cost-sensitive power supply feedback paths.

IC Role / Device Role / Timing Role: Two-terminal voltage reference with ±2% initial tolerance and <100 ppm/°C drift near room temperature.

Use Value: Eliminates need for 3-pin adjustable references in non-critical analog subsystems, reducing BOM count and layout area.

Use Scenario: Supplying reference voltage to 10-bit SAR ADCs in industrial sensor nodes where absolute accuracy is secondary to stability.

IC Role / Device Role / Timing Role: Low-noise, low-drift Zener source delivering 5.1 V ±2% with 130 Ω output impedance.

Use Value: Enables ratiometric measurement without external buffer, cutting component count and power consumption by 30% vs. buffered bandgap solutions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX55C5V1 (ON Semiconductor)	Same 5.1 V nominal Zener, but 500 mW P_d, DO-35 glass package (3.6 × 1.6 mm), higher leakage (≤10 μA @ 1 V).	Requires larger PCB area and lacks URP's ESD rating (only ±25 kV HBM); suitable for through-hole prototyping or legacy repair.	Select when higher power margin is needed and SMT density is not constrained.
MMSZ5231B (Diodes Inc.)	5.1 V Zener, SOD-123 package (3.7 × 1.6 mm), 500 mW P_d, 10 μA I_R @ 1 V, 17 Ω r_d.	Larger footprint and lower ESD rating (±20 kV); better regulation but less suited for ultra-dense layouts or high-ESD zones.	Choose for improved regulation stability where board space permits and ESD stress is moderate.

Compared with BZX55C5V1 and MMSZ5231B, RKZ5.1B2KG#P1 offers the smallest footprint (URP), highest ESD immunity (±30 kV), and lowest leakage at sub-Zener voltages - making it optimal for modern miniaturized, high-reliability consumer and industrial edge devices.

Availability

RKZ5.1B2KG#P1 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller I/O clamping, and 5 V power rail stabilization requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for RKZ5.1B2KG#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 leader specializing in microcontrollers, analog, and power devices for automotive, industrial, and IoT applications.

The RKZ-KG Series is part of Renesas' discrete protection portfolio, engineered specifically for compact, high-reliability surge absorption and voltage stabilization in space-constrained, ESD-prone electronic systems.

FAQ

What is the Zener voltage tolerance of RKZ5.1B2KG#P1?

The RKZ5.1B2KG#P1 has a guaranteed Zener voltage range of 4.98 V to 5.20 V at 5 mA test current, representing ±2.2% tolerance around the nominal 5.1 V value. This tight spread ensures consistent clamping and reference behavior across production lots without requiring post-manufacturing binning or calibration - a key advantage for RKZ5.1B2KG#P1 in cost-sensitive, high-volume applications.

Does RKZ5.1B2KG#P1 meet RoHS and halogen-free requirements?

Yes, RKZ5.1B2KG#P1 belongs to the RKZ-KG P6 Series, explicitly designated as halogen-free and Pb-free per JEDEC J-STD-609A Class 1 and EU RoHS Directive 2011/65/EU. The "P6" suffix in the series name confirms compliance, and the device carries no brominated flame retardants or chlorine-based compounds - verified in Renesas' material declarations for RKZ5.1B2KG#P1.

What is the maximum junction temperature rating for RKZ5.1B2KG#P1?

The maximum rated junction temperature for RKZ5.1B2KG#P1 is 150°C, as specified in the Absolute Maximum Ratings table. This allows continuous operation in high-ambient environments such as enclosed power supplies or automotive cabin modules, provided PCB copper area and airflow maintain junction-to-ambient thermal resistance within limits - a design constraint directly supported by RKZ5.1B2KG#P1's 200 mW power dissipation rating on standard FR-4.

How is the cathode identified on RKZ5.1B2KG#P1?

The cathode of RKZ5.1B2KG#P1 is marked with a visible band on the package body, aligned with terminal 1 per the Pin Arrangement diagram. The laser mark "5•1" appears adjacent to this band, confirming orientation. This marking scheme is standardized across the RKZ-KG Series and matches the physical layout shown in Figure 1 of the REJ03G1512-0300 datasheet for RKZ5.1B2KG#P1.

Can RKZ5.1B2KG#P1 be used as a precision voltage reference?

RKZ5.1B2KG#P1 is not intended for high-precision reference use due to its ±2.2% initial tolerance and lack of temperature-compensated architecture. However, its near-zero temperature coefficient at 5.1 V (per Fig.2) and low dynamic resistance (130 Ω) make it suitable for moderate-accuracy applications like power supply feedback or ADC reference where ±1% system-level error is acceptable - a practical capability confirmed in RKZ5.1B2KG#P1's Electrical Characteristics table.

RKZ5.1B2KG#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:: -

RKZ5.1B2KG#P1 FAQ

1.How can I place an order for RKZ5.1B2KG#P1 through Aetrix?

Please submit a Request for Quotation (RFQ) for RKZ5.1B2KG#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 RKZ5.1B2KG#P1 reliable?

The price and inventory of RKZ5.1B2KG#P1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RKZ5.1B2KG#P1 is usually 5 days.

3.What payment methods are accepted for RKZ5.1B2KG#P1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RKZ5.1B2KG#P1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RKZ5.1B2KG#P1?

RKZ5.1B2KG#P1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RKZ5.1B2KG#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 RKZ5.1B2KG#P1?

For technical support, including RKZ5.1B2KG#P1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RKZ5.1B2KG#P1 requirements.

6.How does Aetrix verify that RKZ5.1B2KG#P1 is sourced from the original manufacturer or authorized distributors?

All RKZ5.1B2KG#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 RKZ5.1B2KG#P1 meets industry standards.

7.What is the process for return or replacement of RKZ5.1B2KG#P1?

All RKZ5.1B2KG#P1 units undergo pre-shipment inspection (PSI). If there is an issue with RKZ5.1B2KG#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 RKZ5.1B2KG#P1 part is unused and in its original packaging.

Return procedure for RKZ5.1B2KG#P1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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