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

Renesas HZK5A-JTR

Name: HZK5A-JTR
Brand: Renesas
SKU: HZK5A-JTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HZK5A-JTR

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: -

Datasheet:: HZK5A-JTR.pdf

Description:: DIODE ZENER

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Product details

Overview

HZK5A-JTR from Renesas Electronics is a silicon epitaxial planar Zener diode designed for voltage regulation in stabilized power supplies, with a nominal zener voltage of 4.3–4.7 V at 5 mA, maximum power dissipation of 500 mW, dynamic resistance ≤100 Ω, and operating junction temperature up to 175°C - used in office equipment, test instrumentation, and consumer electronics power rails.

For engineers reviewing the HZK5A-JTR datasheet, HZK5A-JTR pinout, HZK5A-JTR application, or HZK5A-JTR equivalent, key selection criteria include zener voltage tolerance (±0.4 V), low leakage current (≤5 µA at VR = 1.5 V), LLD surface-mount package compatibility, thermal derating above 25°C, and suitability for low-power reference and overvoltage protection circuits.

Technical Context

The HZK5A-JTR operates as a two-terminal shunt regulator, maintaining stable output voltage across variable load and input conditions via controlled reverse-bias breakdown. Its silicon epitaxial planar construction ensures tight V_Z distribution and low dynamic impedance (rd ≤100 Ω at I_Z = 5 mA).

It exhibits a positive zener voltage temperature coefficient (~+2.0 mV/°C for 4.5 V grade) and is rated for continuous DC operation only - not intended for AC or transient surge suppression without external limiting circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	4.3–4.7 V at I_Z = 5 mA - defines regulated output voltage range under nominal bias
Power Dissipation (P_d)	500 mW at T_a = 25°C - sets maximum continuous DC power handling on PCB
Dynamic Resistance (r_d)	≤100 Ω at I_Z = 5 mA - determines output voltage stability against load current changes
Reverse Leakage (I_R)	≤5 µA at V_R = 1.5 V - ensures minimal quiescent current in standby regulation
Junction Temperature (T_j)	–55 to +175°C - supports operation in industrial ambient environments with proper PCB thermal design
Package	LLD - 2-pin surface-mount package (1.4 mm Ø cathode band, 3.5 mm body length) enabling high-density layout

Pinout & Package

LLD package: ultra-compact cylindrical glass-passivated surface-mount diode with axial lead frame, cathode identified by colored band. Designed for reflow soldering on standard FR-4 PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1 (Banded End)	Cathode	Connected to higher-potential node; reverse-bias terminal where zener breakdown occurs
2 (Non-banded End)	Anode	Connected to lower-potential node (typically ground or return path); completes shunt regulation loop

Key Features

Feature	Design Value
Low zener impedance	r_d ≤100 Ω enables stable regulation under ±10% load variation without external compensation
Wide V_Z spectrum (1.9–38 V)	Supports system-level voltage referencing across multiple rail levels using same LLD footprint family
500 mW power rating	Allows direct use in low-current (<10 mA) bias networks without heatsinking or derating below 70°C ambient
LLD surface-mount package	0.027 g mass and 3.5 mm length enable automated placement and high board density in space-constrained designs

Applications

Reference Voltage Source	Overvoltage Clamp
Use Scenario: Providing precise 4.5 V reference for ADC biasing or op-amp feedback in portable test equipment. IC Role / Device Role / Timing Role: Shunt voltage reference establishing stable analog reference point independent of supply ripple. Use Value: Tight V_Z tolerance (±0.4 V) and low rd ensure <±0.5% reference drift across 0–70°C operating range.	Use Scenario: Protecting microcontroller I/O pins from ESD-induced transients in USB peripheral interfaces. IC Role / Device Role / Timing Role: Passive clamping element diverting excess voltage to ground before IC damage threshold is exceeded. Use Value: Fast response (ns-scale turn-on) and 500 mW peak pulse capability limit clamped voltage to ≤5.3 V during 1 kV HBM events.
Power Supply Feedback	Current Source Bias
Use Scenario: Setting output voltage in adjustable linear regulators (e.g., LM317-based supplies) for lab bench power units. IC Role / Device Role / Timing Role: Precision voltage-setting element in feedback divider network to control regulator output. Use Value: Stable V_Z with <±0.1%/°C TC allows accurate 12 V output setting with <±2% total error over temperature.	Use Scenario: Establishing constant bias current for LED drivers in indicator panels of industrial HMIs. IC Role / Device Role / Timing Role: Fixed-voltage drop element defining emitter-base voltage of PNP current mirror transistor. Use Value: Low leakage (<5 µA) prevents significant error in sub-mA bias currents, ensuring ±3% current accuracy.

Reference Voltage Source

Overvoltage Clamp

Use Scenario: Providing precise 4.5 V reference for ADC biasing or op-amp feedback in portable test equipment.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing stable analog reference point independent of supply ripple.

Use Value: Tight V_Z tolerance (±0.4 V) and low rd ensure <±0.5% reference drift across 0–70°C operating range.

Use Scenario: Protecting microcontroller I/O pins from ESD-induced transients in USB peripheral interfaces.

IC Role / Device Role / Timing Role: Passive clamping element diverting excess voltage to ground before IC damage threshold is exceeded.

Use Value: Fast response (ns-scale turn-on) and 500 mW peak pulse capability limit clamped voltage to ≤5.3 V during 1 kV HBM events.

Power Supply Feedback

Current Source Bias

Use Scenario: Setting output voltage in adjustable linear regulators (e.g., LM317-based supplies) for lab bench power units.

IC Role / Device Role / Timing Role: Precision voltage-setting element in feedback divider network to control regulator output.

Use Value: Stable V_Z with <±0.1%/°C TC allows accurate 12 V output setting with <±2% total error over temperature.

Use Scenario: Establishing constant bias current for LED drivers in indicator panels of industrial HMIs.

IC Role / Device Role / Timing Role: Fixed-voltage drop element defining emitter-base voltage of PNP current mirror transistor.

Use Value: Low leakage (<5 µA) prevents significant error in sub-mA bias currents, ensuring ±3% current accuracy.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX55C4V3	V_Z = 4.3 V ±5%, P_d = 500 mW, DO-35 package (larger than LLD), rd ≈ 90 Ω	Through-hole assembly required; less suitable for high-density SMT layouts	Select when legacy through-hole manufacturing or higher surge robustness is prioritized over board space
MMSZ4685	V_Z = 4.7 V ±5%, P_d = 500 mW, SOD-123 package, rd ≈ 120 Ω	Slightly higher nominal V_Z and impedance; different marking and thermal profile	Choose for RoHS-compliant SMT production where JEDEC-standard SOD-123 footprint is already established

Compared with BZX55C4V3 and MMSZ4685, the HZK5A-JTR offers tighter V_Z tolerance (±0.4 V vs. ±5%), identical power rating, and the smallest LLD footprint - making it optimal for miniaturized, precision-regulated power rails where thermal and spatial constraints are critical.

Availability

HZK5A-JTR is available at Aetrix Electronics and suitable for office equipment, test and measurement instruments, and audio/video consumer electronics requiring stable component supply and long-term obsolescence management.

Supply support for HZK5A-JTR 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog and power devices, and SoC solutions for industrial, automotive, and consumer markets.

The HZK Series belongs to Renesas' legacy discrete Zener diode product line, engineered specifically for cost-sensitive, high-reliability voltage stabilization in standard-grade electronic systems.

FAQ

What is the exact zener voltage range specified for HZK5A-JTR?

The HZK5A-JTR has a guaranteed zener voltage range of 4.3 V to 4.7 V when tested at I_Z = 5 mA and T_a = 25°C. This ±0.4 V tolerance reflects the "A" grade within the HZK5 family and is confirmed in the Renesas REJ03G0018-0300Z datasheet, page 2. The HZK5A-JTR achieves this specification using silicon epitaxial planar process control.

Does HZK5A-JTR support surface-mount reflow soldering?

Yes, the HZK5A-JTR uses the LLD package - a glass-passivated, cylindrical surface-mount device qualified for standard Pb-free reflow profiles per J-STD-020. Its 3.5 mm body length and 1.4 mm diameter allow compatibility with pick-and-place machines and IR/convection reflow ovens. Thermal derating begins above 25°C ambient, as shown in Figure 3 of the HZK Series datasheet.

What is the maximum reverse leakage current for HZK5A-JTR?

The maximum reverse leakage current for HZK5A-JTR is 5 µA at V_R = 1.5 V and T_a = 25°C, per the Electrical Characteristics table on page 2 of the Renesas HZK Series datasheet. This low leakage ensures minimal parasitic current draw in high-impedance reference or clamp circuits where signal integrity depends on near-zero off-state conduction.

Can HZK5A-JTR be used in place of HZK5B or HZK5C?

No - HZK5A-JTR is not interchangeable with HZK5B or HZK5C due to differing zener voltage ranges: HZK5B is 4.6–5.0 V, and HZK5C is 4.9–5.3 V. Substituting across grades risks incorrect regulation or overvoltage stress. Each variant has distinct color coding (HZK5A = Yellow Green/Yellow/Pink) and must be selected per circuit V_Z requirement.

Is HZK5A-JTR compliant with RoHS and REACH regulations?

Yes, HZK5A-JTR meets EU RoHS Directive 2011/65/EU and REACH SVHC requirements as confirmed by Renesas Electronics' environmental compliance documentation. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and its LLD package uses lead-free glass passivation compatible with modern SMT processes.

HZK5A-JTR 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:: -

HZK5A-JTR FAQ

1.How can I place an order for HZK5A-JTR through Aetrix?

Please submit a Request for Quotation (RFQ) for HZK5A-JTR 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 HZK5A-JTR reliable?

The price and inventory of HZK5A-JTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZK5A-JTR is usually 5 days.

3.What payment methods are accepted for HZK5A-JTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZK5A-JTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HZK5A-JTR?

HZK5A-JTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HZK5A-JTR 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 HZK5A-JTR?

For technical support, including HZK5A-JTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZK5A-JTR requirements.

6.How does Aetrix verify that HZK5A-JTR is sourced from the original manufacturer or authorized distributors?

All HZK5A-JTR 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 HZK5A-JTR meets industry standards.

7.What is the process for return or replacement of HZK5A-JTR?

All HZK5A-JTR units undergo pre-shipment inspection (PSI). If there is an issue with HZK5A-JTR, 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 HZK5A-JTR part is unused and in its original packaging.

Return procedure for HZK5A-JTR:

1.Submit a request within 90 days.

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

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