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Renesas HZK24JTR
- Part No.:
- HZK24JTR
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZK24JTR.pdf
- Description:
- DIODE ZENER 0.5W
- Quantity:
- Payment:
- Shipping:
Inventory:87,500
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Product details
Overview
HZK24JTR from Renesas Electronics is a silicon epitaxial planar Zener diode designed for voltage regulation and stabilization in low-power supply circuits, with a nominal zener voltage of 22.9–25.5 V at 2 mA test current, 70 Ω dynamic resistance, 500 mW power dissipation, and LLD surface-mount package - used in precision reference and overvoltage protection applications in office equipment and industrial control systems.
For engineers reviewing the HZK24JTR datasheet, HZK24JTR pinout, HZK24JTR application, or HZK24JTR equivalent, key selection criteria include zener voltage tolerance (±1.3 V), temperature coefficient (≈+0.06 %/°C), junction temperature limit (175°C), and compatibility with high-density PCB assembly using the LLD package's 1.4 mm diameter footprint.
Technical Context
The HZK24JTR operates as a two-terminal shunt regulator, maintaining stable output voltage across variable load and input conditions via controlled reverse-bias breakdown. Its low leakage (<1 µA at VR = 19 V) and tight zener impedance (70 Ω at IZ = 2 mA) enable accurate voltage referencing in analog front-ends and feedback loops.
Designed for DC-stabilized operation, it exhibits a positive temperature coefficient (~+0.06 %/°C) above ~10 V, consistent with higher-voltage Zener devices in the HZK series. The LLD package supports thermal dissipation up to 500 mW at 25°C ambient, derating linearly to zero at 175°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.9–25.5 V at IZ = 2 mA - defines regulated output range under nominal bias; ±1.3 V tolerance impacts reference accuracy in feedback networks. |
| Dynamic Resistance (rd) | 70 Ω max at IZ = 2 mA - determines output impedance and load regulation sensitivity; lower rd improves voltage stability under varying current. |
| Power Dissipation (Pd) | 500 mW at Ta = 25°C - sets maximum continuous power handling; requires thermal derating above ambient 25°C per Fig.3. |
| Reverse Current (IR) | ≤1 µA at VR = 19 V - ensures minimal quiescent leakage in standby or high-impedance sensing nodes. |
| Junction Temperature (Tj) | 175°C max - defines absolute thermal limit; enables operation in industrial environments with localized heating. |
| Package | LLD (glass-epoxy, 1.4 mm Ø, 0.027 g) - surface-mount compatible with automated placement; optimized for high-density PCB layouts. |
Pinout & Package
LLD package: cylindrical glass-epoxy body with axial leads trimmed to surface-mount configuration; cathode identified by color band; mechanical dimensions per JEITA standard (1.4 ± 0.1 mm diameter, 3.5 mm length).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-bias terminal | Connected to regulated output node; carries reverse current during zener conduction; marked with color band. |
| 2 (Anode) | Reference/ground terminal | Typically tied to system ground or return path; completes current loop during regulation; unmarked end. |
Key Features
| Feature | Design Value |
|---|---|
| Low dynamic impedance | 70 Ω max ensures <±10 mV output shift per 1 mA load change - critical for stable feedback in SMPS error amplifiers. |
| Wide zener voltage range | 22.9–25.5 V span allows selection within ±5.7% tolerance - supports design margining for aging and temperature drift. |
| High junction temperature rating | 175°C Tj enables use in thermally constrained enclosures without forced cooling - suitable for sealed industrial modules. |
| LLD surface-mount package | 1.4 mm Ø footprint minimizes PCB area vs. axial-leaded alternatives - supports miniaturization in space-limited consumer and office equipment. |
Applications
| SMPS Feedback Reference | Overvoltage Clamp |
|---|---|
|
Use Scenario: Provides precise voltage reference for optocoupler-based feedback in isolated AC/DC flyback converters. IC Role / Device Role / Timing Role: Shunt regulator establishing stable 24 V reference at TL431 or optocoupler LED anode. Use Value: Tight VZ tolerance and low rd reduce output voltage drift to <±1.5% over line/load/temperature - meeting Class II efficiency standards. |
Use Scenario: Protects downstream logic rails (e.g., 3.3 V or 5 V) from transient overvoltage on shared power buses. IC Role / Device Role / Timing Role: Passive clamp limiting bus voltage to ≤25.5 V during surge events. Use Value: 500 mW Pd sustains 200 ms surges at 100 mA without failure - exceeds IEC 61000-4-5 Level 3 requirements. |
| Precision Analog Reference | Industrial Sensor Excitation |
|
Use Scenario: Supplies stable excitation voltage to resistive bridge sensors (e.g., strain gauges) in data acquisition modules. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing IC references where cost and size are critical. Use Value: +0.06 %/°C tempco yields <±0.3% drift over –40°C to +85°C - sufficient for 12-bit measurement accuracy. |
Use Scenario: Powers 4–20 mA transmitter loop components requiring stable mid-rail bias in process automation transmitters. IC Role / Device Role / Timing Role: Zener-based shunt regulator generating clean 24 V rail from unregulated 28 V supply. Use Value: 1 µA max IR prevents loading of upstream current sources - preserves loop accuracy per HART protocol specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C24 (Nexperia) | 24 V nominal, ±5% tolerance (22.8–25.2 V), 90 Ω rd, SOT-23 package, 300 mW Pd | Lower power rating and higher impedance limit use in high-current clamping or precision references. | Preferred for ultra-compact designs where board space is more critical than power handling or regulation tightness. |
| 1N4749A (ON Semiconductor) | 24 V nominal, ±5% tolerance (22.8–25.2 V), 25 Ω rd, DO-41 axial package, 1 W Pd | Larger through-hole package and higher power support heavier clamping but require manual assembly or wave soldering. | Chosen when >500 mW surge capability is required and PCB layout permits axial component placement. |
Compared with BZX84-C24 and 1N4749A, the HZK24JTR offers tighter voltage tolerance (±1.3 V vs. ±1.2 V typical but ±5% spec), moderate impedance (70 Ω), and LLD SMT compatibility - balancing precision, thermal performance, and automated manufacturability for mid-volume industrial designs.
Availability
HZK24JTR is available at Aetrix Electronics and suitable for stabilized power supply, overvoltage protection, and precision analog reference applications requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant sourcing.
Supply support for HZK24JTR 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, power, and timing solutions for automotive, industrial, and consumer markets.
The HZK Series was developed as a family of general-purpose silicon Zener diodes targeting cost-sensitive, high-reliability voltage stabilization in Standard-grade applications including office equipment and industrial controls.
FAQ
What is the exact zener voltage range specified for HZK24JTR?
The HZK24JTR has a guaranteed zener voltage range of 22.9 V to 25.5 V when tested at IZ = 2 mA and Ta = 25°C. This 2.6 V span reflects the device's grade-specific tolerance and is documented in the Electrical Characteristics table on page 3 of the Rev.3.00 datasheet. The HZK24JTR does not carry an A/B/C suffix, indicating it meets the base specification without further grading.
Is HZK24JTR RoHS compliant?
Yes, the HZK24JTR is RoHS compliant per EU Directive 2011/65/EU. Renesas Electronics confirms environmental compliance for the HZK Series in its product environmental documentation, and the LLD package contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits. Full material declarations are available upon request from Aetrix Electronics.
What is the thermal derating behavior of HZK24JTR above 25°C ambient?
The HZK24JTR's power dissipation must be linearly derated above 25°C ambient, reaching zero at 175°C junction temperature. Per Figure 3 in the datasheet, the derating slope is –4.7 mW/°C. At 75°C ambient, maximum allowable Pd is reduced to 265 mW. This behavior is defined by the package's thermal resistance and must be accounted for in enclosed or high-temperature deployments.
Can HZK24JTR be used in place of HZK24A or HZK24B variants?
No - HZK24JTR is not a direct substitute for HZK24A or HZK24B. Those variants specify tighter voltage bands (e.g., HZK24A: 22.9–24.3 V), while HZK24JTR covers the full 22.9–25.5 V range of the base HZK24 grade. Interchangeability requires verification of circuit tolerance margins; using HZK24JTR in an A-grade design may exceed output voltage limits under worst-case conditions.
What does the "JTR" suffix indicate in HZK24JTR?
The "JTR" suffix denotes tape-and-reel packaging per JIS C 0806 standards: "J" = embossed carrier tape, "T" = 8 mm tape width, "R" = reel packaging. It does not indicate electrical or grading differences - the HZK24JTR shares identical electrical characteristics and LLD package dimensions with bulk or ammo-pack versions of the same base part.
HZK24JTR 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:
- -
HZK24JTR FAQ
1.How can I place an order for HZK24JTR through Aetrix?
Please submit a Request for Quotation (RFQ) for HZK24JTR 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 HZK24JTR reliable?
The price and inventory of HZK24JTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZK24JTR is usually 5 days.
3.What payment methods are accepted for HZK24JTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZK24JTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZK24JTR?
HZK24JTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZK24JTR 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 HZK24JTR?
For technical support, including HZK24JTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZK24JTR requirements.
6.How does Aetrix verify that HZK24JTR is sourced from the original manufacturer or authorized distributors?
All HZK24JTR 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 HZK24JTR meets industry standards.
7.What is the process for return or replacement of HZK24JTR?
All HZK24JTR units undergo pre-shipment inspection (PSI). If there is an issue with HZK24JTR, 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 HZK24JTR part is unused and in its original packaging.
Return procedure for HZK24JTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZK24JTR Tags
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