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Renesas HZS4A3TD-E
- Part No.:
- HZS4A3TD-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZS4A3TD-E.pdf
- Description:
- DIODE ZENER 0.4W
- Quantity:
- Payment:
- Shipping:
Inventory:35,000
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Product details
Overview
HZS4A3TD-E from Renesas Electronics is a silicon planar Zener diode designed for precision voltage regulation in low-power stabilized power supplies, with a nominal zener voltage of 4.2–4.4 V, 400 mW power dissipation, and low dynamic impedance (≤100 Ω at 5 mA), commonly used in reference voltage generation for analog sensors and microcontroller reset circuits.
For engineers reviewing the HZS4A3TD-E datasheet, HZS4A3TD-E pinout, HZS4A3TD-E application, or HZS4A3TD-E equivalent, this device serves as a compact, high-stability voltage reference in space-constrained industrial control modules, battery-powered instrumentation, and embedded power monitoring subsystems where thermal stability and leakage current (<25 µA at 0.5 V) are critical selection criteria.
Technical Context
The HZS4A3TD-E operates as a two-terminal shunt regulator, maintaining stable output voltage across variable load currents by conducting reverse-biased zener breakdown at its specified test current (5 mA). Its junction temperature rating of 200°C supports operation in thermally demanding environments such as motor drive PCBs and industrial PLC I/O modules.
Designed for surface-mount compatibility with 5 mm-pitch automated insertion, it features a low-profile MHD package (2.0 mm diameter, 26 mm lead length) and exhibits a zener voltage temperature coefficient of approximately −0.04 %/°C near 4.3 V - enabling predictable drift compensation in unregulated DC-DC feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.2–4.4 V at 5 mA - defines precise clamping threshold for overvoltage protection and reference generation. |
| Power Dissipation (Pd) | 400 mW - sets maximum continuous power handling without derating up to 25°C ambient. |
| Dynamic Resistance (rd) | ≤100 Ω at 5 mA - ensures minimal output voltage variation under changing load current. |
| Reverse Leakage Current | ≤25 µA at 0.5 V - guarantees low quiescent current in standby-mode voltage monitors. |
| Junction Temperature (Tj) | 200°C - enables reliable operation in high-temperature industrial enclosures and near heat-generating components. |
| Storage Temperature | −55 to +175°C - supports long-term storage and reflow-compatible assembly in automotive-grade manufacturing lines. |
Pinout & Package
Package: MHD (glass-passivated, axial-lead, 2.0 mm diameter × 26 mm length, lake blue cathode band).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to regulated output node; polarity must be observed to enable reverse conduction. |
| 2 (Anode) | Reference ground terminal | Tied to system ground or lower potential rail; forms return path for zener current. |
Key Features
| Feature | Design Value |
|---|---|
| Low zener impedance | ≤100 Ω at 5 mA - improves regulation accuracy under dynamic load transients in sensor bias networks. |
| Wide zener voltage range coverage | 1.6–38 V family - allows direct replacement across multiple supply rails without redesigning feedback dividers. |
| High-temperature junction rating | 200°C - eliminates need for thermal derating in enclosed power supply compartments. |
| Low leakage current | ≤25 µA at 0.5 V - minimizes error in high-impedance reference nodes used in 12-bit ADC front-ends. |
| Automated insertion compatibility | 5 mm pitch - supports high-throughput placement on legacy SMT lines using standard axial component feeders. |
Applications
| Industrial Sensor Reference | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Providing stable 4.3 V reference for bridge-based pressure transducers in factory-floor condition monitoring systems. IC Role / Device Role / Timing Role: Shunt voltage reference establishing excitation voltage accuracy and ADC input scaling baseline. Use Value: Enables ±0.5% full-scale measurement repeatability despite ambient temperature swings from −25°C to +85°C. |
Use Scenario: Generating clean, temperature-stable reset threshold for Renesas RL78/G13 MCU in smart meter designs. IC Role / Device Role / Timing Role: Zener-clamped voltage monitor triggering POR (power-on reset) when VDD exceeds 4.25 V. Use Value: Eliminates external supervisor IC, reducing BOM count while meeting IEC 62056-21 reset timing requirements. |
| LED Current Regulation | Overvoltage Clamp in DC-DC Feedback |
Use Scenario: Setting reference voltage for constant-current LED driver ICs in emergency lighting control panels. IC Role / Device Role / Timing Role: Precision voltage source defining current-sense amplifier threshold in linear LED regulators. Use Value: Maintains luminous flux stability within ±3% over 10,000-hour operational life under thermal cycling. |
Use Scenario: Clamping feedback node of buck converter (e.g., ISL85415) to limit output overvoltage during light-load conditions. IC Role / Device Role / Timing Role: Secondary shunt limiter protecting downstream 3.3 V logic from transient overshoot exceeding 4.5 V. Use Value: Adds fail-safe layer without affecting primary loop stability or requiring additional optocoupler isolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C4V3 (Nexperia) | Same 4.3 V nominal VZ, but 500 mW Pd and higher rd (120 Ω); DO-35 package (3.5 mm length). | Higher power margin suits intermittent surge clamping; longer leads complicate dense-layout routing. | Prefer for cost-sensitive consumer designs where thermal headroom >100 mW is required. |
| MMBZ5229BS (ON Semiconductor) | SOT-23 surface-mount package; same VZ tolerance (±5%), but lower Pd (350 mW) and higher IR (100 µA at 1 V). | Enables board-level miniaturization but requires PCB rework for footprint change and lacks axial mechanical robustness. | Choose when space constraints prohibit axial components and reflow compatibility is mandatory. |
Compared with BZX55C4V3 and MMBZ5229BS, the HZS4A3TD-E offers optimal balance of thermal ruggedness (200°C Tj), low leakage (≤25 µA), and automated insertion readiness - making it preferred for industrial control boards requiring long-term calibration stability and mixed-technology assembly.
Availability
HZS4A3TD-E is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller reset circuits, and LED driver references requiring stable component supply with consistent parametric performance across production lots.
Supply support for HZS4A3TD-E 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 SoC solutions for industrial, automotive, and infrastructure markets.
The HZS Series belongs to Renesas' discrete voltage reference product line, engineered specifically for high-reliability, low-drift stabilization in cost-sensitive yet thermally demanding power management subsystems.
FAQ
What is the exact zener voltage range for HZS4A3TD-E?
The HZS4A3TD-E has a guaranteed zener voltage range of 4.2 V to 4.4 V when tested at 5 mA DC current, per Renesas datasheet REJ03G0184-0500 Rev.5.00. This grade (A3) corresponds to the tightest tolerance bin within the HZS4 family, ensuring repeatable performance in precision reference applications without post-manufacturing sorting.
Does HZS4A3TD-E support reflow soldering?
No - the HZS4A3TD-E uses an axial MHD package with tinned copper leads and glass passivation, intended for wave soldering or hand-soldering. Reflow exposure risks internal thermal stress and parameter shift due to its non-SMT construction; Renesas specifies manual or selective soldering only per JEDEC J-STD-020 guidelines for through-hole variants.
What is the maximum reverse leakage current specification for HZS4A3TD-E?
The HZS4A3TD-E exhibits ≤25 µA reverse leakage current at 0.5 V applied reverse voltage (VR), measured at 25°C ambient. This low leakage preserves accuracy in high-impedance bias networks, such as those feeding op-amp inputs in battery-operated instrumentation where standby current must remain below 100 µA.
Can HZS4A3TD-E replace HZS4B2 in existing designs?
Yes - both share identical MHD packaging, pinout, and thermal ratings, but HZS4A3TD-E (4.2–4.4 V) has tighter zener voltage tolerance than HZS4B2 (4.6–4.8 V). Substitution requires verifying that the 0.4 V lower nominal VZ aligns with circuit headroom and regulation setpoint; no PCB changes are needed if voltage margin permits.
Is HZS4A3TD-E qualified for automotive applications?
No - the HZS4A3TD-E carries Renesas' "Standard" quality grade, rated for industrial and commercial use (e.g., office equipment, test gear, home appliances). It is not AEC-Q200 qualified, lacks automotive-specific screening, and is not recommended for vehicle ECUs or ADAS subsystems where "High Quality" or "Specific" grade components are mandated.
HZS4A3TD-E 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:
- -
HZS4A3TD-E FAQ
1.How can I place an order for HZS4A3TD-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZS4A3TD-E 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 HZS4A3TD-E reliable?
The price and inventory of HZS4A3TD-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZS4A3TD-E is usually 5 days.
3.What payment methods are accepted for HZS4A3TD-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZS4A3TD-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZS4A3TD-E?
HZS4A3TD-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZS4A3TD-E 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 HZS4A3TD-E?
For technical support, including HZS4A3TD-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZS4A3TD-E requirements.
6.How does Aetrix verify that HZS4A3TD-E is sourced from the original manufacturer or authorized distributors?
All HZS4A3TD-E 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 HZS4A3TD-E meets industry standards.
7.What is the process for return or replacement of HZS4A3TD-E?
All HZS4A3TD-E units undergo pre-shipment inspection (PSI). If there is an issue with HZS4A3TD-E, 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 HZS4A3TD-E part is unused and in its original packaging.
Return procedure for HZS4A3TD-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZS4A3TD-E Tags
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