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Renesas HZS7A3TD-E
- Part No.:
- HZS7A3TD-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZS7A3TD-E.pdf
- Description:
- DIODE ZENER 0.4W
- Quantity:
- Payment:
- Shipping:
Inventory:30,000
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Product details
Overview
HZS7A3TD-E from Renesas Electronics is a silicon planar Zener diode designed for precision voltage regulation in low-power stabilized power supplies. It delivers a nominal zener voltage of 7.5 V to 7.9 V at 5 mA test current, with dynamic resistance of 15 Ω, maximum power dissipation of 400 mW, and operates across −55°C to +175°C storage temperature range. It is used in voltage reference circuits for sensor signal conditioning and microcontroller supply rail stabilization.
For engineers reviewing the HZS7A3TD-E datasheet, HZS7A3TD-E pinout, HZS7A3TD-E application, or HZS7A3TD-E equivalent, this device serves as a discrete voltage reference with tight tolerance (±0.4 V), low leakage, and high thermal stability - critical for analog front-end design, industrial control feedback loops, and embedded power monitoring systems.
Technical Context
The HZS7A3TD-E implements a silicon planar junction structure optimized for stable reverse-breakdown behavior under DC bias. Its zener voltage is specified at 5 mA with ±0.4 V tolerance and exhibits a temperature coefficient of approximately −0.04 %/°C near 7.7 V, enabling predictable drift compensation in fixed-reference designs.
It features low dynamic impedance (15 Ω) and low reverse leakage (≤1 µA at VR = 5 V), supporting accurate regulation in low-current bias networks. The device is rated for 400 mW power dissipation at 25°C ambient and derates linearly above 25°C per the published thermal curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V to 7.9 V at IZ = 5 mA - defines precise regulation point for feedback or reference use |
| Dynamic Resistance (rd) | 15 Ω max at IZ = 5 mA - ensures minimal output voltage shift under load variation |
| Power Dissipation (Pd) | 400 mW at Ta = 25°C - sets maximum continuous DC power handling in PCB-mounted operation |
| Reverse Leakage (IR) | ≤1 µA at VR = 5 V - guarantees negligible current draw in standby or high-impedance bias networks |
| Junction Temperature (Tj) | 200°C max - supports reliable operation in thermally constrained industrial environments |
| Storage Temperature | −55°C to +175°C - enables use in automotive under-hood, industrial motor drives, and outdoor equipment |
Pinout & Package
Package: MHD (Mini-High-Density) molded plastic package with 2.0 mm diameter body and 5 mm lead pitch, optimized for high-speed automatic insertion. Cathode identified by lake-blue band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to regulated output node; reverse-biased terminal where zener breakdown occurs |
| 2 | Anode | Connected to ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low zener impedance | 15 Ω max ensures <15 mV output shift per 1 mA load change - critical for stable ADC reference rails |
| Wide zener voltage range coverage | Part of HZS Series spanning 1.6 V–38 V - allows single-supplier sourcing across multiple voltage tiers |
| High-temperature capability | Rated up to 200°C junction temperature - suitable for engine-control modules and industrial PLCs |
| Automated assembly compatibility | 5 mm pitch and MHD package enable direct use in high-throughput SMT/reflow-compatible through-hole lines |
Applications
| Industrial Sensor Signal Conditioning | Microcontroller Supply Rail Stabilization |
|---|---|
Use Scenario: Precision analog sensors (e.g., pressure, temperature) require stable excitation or reference voltage independent of main supply ripple. IC Role / Device Role / Timing Role: Zener reference providing fixed 7.7 V bias for op-amp gain stages and ADC reference dividers. Use Value: Low dynamic resistance (15 Ω) and tight VZ tolerance (±0.4 V) minimize measurement error drift across temperature. |
Use Scenario: Embedded microcontrollers in factory automation controllers need clean 3.3 V or 5 V rails derived from unregulated 12 V inputs. IC Role / Device Role / Timing Role: Shunt regulator establishing stable intermediate node for LDO input or reset circuit threshold. Use Value: 400 mW power rating and −55°C to +175°C storage range support long-term reliability in sealed enclosures without active cooling. |
| Programmable Logic Controller (PLC) Input Protection | DC-DC Converter Feedback Reference |
Use Scenario: Analog input modules must clamp transient overvoltage while preserving signal integrity during normal operation. IC Role / Device Role / Timing Role: Zener clamping diode placed across input terminals to limit voltage to safe levels before signal conditioning stage. Use Value: Low leakage (<1 µA) prevents loading of high-impedance sensor sources; fast response to transients due to planar junction design. |
Use Scenario: Isolated flyback or forward converters require accurate secondary-side voltage sensing for regulation loop stability. IC Role / Device Role / Timing Role: Reference element in optocoupler feedback network, setting precise regulation threshold for TL431-like topology. Use Value: Stable 7.7 V output enables consistent feedback divider ratio; temperature coefficient (−0.04 %/°C) simplifies thermal compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C7V5 (Nexperia) | 7.5 V nominal, ±5% tolerance (±0.375 V), 80 Ω dynamic resistance, SOT-23 package | Higher impedance and looser tolerance reduce accuracy in precision references; smaller footprint suits space-constrained layouts | Select when board area is critical and ±5% regulation tolerance is acceptable |
| 1N4733A (ON Semiconductor) | 5.1 V nominal, ±5%, 9 Ω rd, DO-41 package, 1 W rating | Lower voltage and higher power rating suit general-purpose shunt regulation but not 7.7 V reference needs | Choose only if redesigning for 5.1 V reference and requiring higher surge energy handling |
Compared with BZX84-C7V5 and 1N4733A, the HZS7A3TD-E offers tighter voltage tolerance (±0.4 V vs. ±5%), lower dynamic resistance (15 Ω vs. 80 Ω or 9 Ω), and extended temperature range (−55°C to +175°C), making it preferable for industrial-grade analog reference and sensor interface applications demanding long-term stability.
Availability
HZS7A3TD-E is available at Aetrix Electronics and suitable for industrial sensor interfaces, programmable logic controller (PLC) input modules, and microcontroller power supervision requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for HZS7A3TD-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 timing solutions for industrial, automotive, and infrastructure markets.
The HZS Series belongs to Renesas' discrete Zener diode product line, engineered for high-stability voltage reference and protection in harsh-environment power systems - emphasizing low leakage, tight tolerance, and wide operating temperature range.
FAQ
What is the exact zener voltage range specified for HZS7A3TD-E?
The HZS7A3TD-E has a guaranteed zener voltage range of 7.5 V to 7.9 V when tested at IZ = 5 mA and Ta = 25°C. This 0.4 V span reflects its "C3" grade within the HZS7 family and is confirmed in the Renesas REJ03G0184-0500 datasheet, page 3. The HZS7A3TD-E maintains this specification across its qualified operating conditions without derating.
Does HZS7A3TD-E support high-temperature industrial environments?
Yes, the HZS7A3TD-E is rated for junction temperatures up to 200°C and storage temperatures from −55°C to +175°C. Its silicon planar construction and MHD package enable reliable operation in under-hood automotive modules, motor drive controls, and factory-floor PLCs where ambient temperatures exceed 85°C. Derating curves in the datasheet confirm usable power at elevated Ta.
What is the dynamic resistance of HZS7A3TD-E and why does it matter?
The HZS7A3TD-E has a maximum dynamic resistance (rd) of 15 Ω at IZ = 5 mA. This low value means the output voltage changes less than 15 mV for every 1 mA change in current - essential for maintaining accuracy in precision reference circuits, such as those feeding ADCs or op-amp bias networks where load variations occur.
Is HZS7A3TD-E compatible with automated PCB assembly processes?
Yes, the HZS7A3TD-E uses the MHD package with 5 mm lead pitch and standardized lead form, explicitly designed for high-speed automatic insertion equipment. Renesas confirms suitability for 5 mm-pitch pick-and-place and wave soldering in the ordering information section of the datasheet (page 1). No special tooling or reflow profile adjustments are required beyond standard through-hole guidelines.
How does the temperature coefficient of HZS7A3TD-E affect system-level accuracy?
The HZS7A3TD-E exhibits a zener voltage temperature coefficient of approximately −0.04 %/°C near its 7.7 V nominal point, as shown in Figure 2 of the datasheet. This translates to roughly −3.1 mV/°C drift - enabling predictable compensation in analog circuits and minimizing calibration burden in temperature-varying environments like industrial enclosures or outdoor instrumentation.
HZS7A3TD-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:
- -
HZS7A3TD-E FAQ
1.How can I place an order for HZS7A3TD-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZS7A3TD-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 HZS7A3TD-E reliable?
The price and inventory of HZS7A3TD-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZS7A3TD-E is usually 5 days.
3.What payment methods are accepted for HZS7A3TD-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZS7A3TD-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZS7A3TD-E?
HZS7A3TD-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZS7A3TD-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 HZS7A3TD-E?
For technical support, including HZS7A3TD-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZS7A3TD-E requirements.
6.How does Aetrix verify that HZS7A3TD-E is sourced from the original manufacturer or authorized distributors?
All HZS7A3TD-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 HZS7A3TD-E meets industry standards.
7.What is the process for return or replacement of HZS7A3TD-E?
All HZS7A3TD-E units undergo pre-shipment inspection (PSI). If there is an issue with HZS7A3TD-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 HZS7A3TD-E part is unused and in its original packaging.
Return procedure for HZS7A3TD-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZS7A3TD-E Tags
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MM5Z5V1ST1G
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