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Renesas HZ7A2LTD-E
- Part No.:
- HZ7A2LTD-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ7A2LTD-E.pdf
- Description:
- DIODE ZENER 0.4W
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
HZ7A2LTD-E from Renesas Electronics is a silicon planar Zener diode optimized for low-noise voltage reference and stabilization in precision analog circuits, featuring a nominal zener voltage of 6.5 V (min 6.4 V / max 6.7 V), dynamic resistance of 60 Ω at 3.5 mA, and maximum power dissipation of 400 mW in a DO-35 package. It is used in low-drift bandgap reference buffers, sensor signal conditioning front-ends, and regulated power supply feedback paths where noise sensitivity is critical.
For engineers reviewing the HZ7A2LTD-E datasheet, HZ7A2LTD-E pinout, HZ7A2LTD-E application, or HZ7A2LTD-E equivalent, key selection criteria include its 60 Ω zener impedance at 3.5 mA, −0.04 %/°C temperature coefficient near 6.5 V, 1 μA reverse leakage at 4 V, and DO-35 mechanical compatibility with legacy through-hole PCB layouts requiring stable low-noise references.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in a planar-diffused silicon junction. Its low-noise performance stems from optimized doping profile and passivation, achieving diode noise ~1/3–1/10 that of standard HZ-series Zeners. The 6.5 V nominal zener point falls in the region of minimum temperature coefficient (−0.04 %/°C), enabling stable operation across −55°C to +175°C junction range.
Designed for DC-biased applications only (per datasheet Note 1), it requires external current limiting and exhibits no transient response specification. Its 400 mW power rating is derated linearly above 25°C ambient per Fig.3, reaching zero dissipation at ~125°C on standard FR-4 PCB with 10 mm lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.4 V min / 6.7 V max at IZ = 3.5 mA - defines tight 6.5 V nominal regulation point with ±0.15 V tolerance for precision biasing |
| Dynamic Resistance (rd) | 60 Ω max at IZ = 3.5 mA - ensures minimal output voltage shift under load transients in reference circuits |
| Reverse Leakage (IR) | 1 μA max at VR = 4 V - enables high-impedance sensing nodes without significant error current injection |
| Power Dissipation (Pd) | 400 mW max at Ta = 25°C - supports continuous operation in compact through-hole designs with adequate PCB copper area |
| Temperature Coefficient (γZ) | −0.04 %/°C typical near 6.5 V - minimizes drift in temperature-sensitive instrumentation and calibration systems |
| Junction Temperature (Tj) | 175°C max - allows operation in high-ambient industrial environments when properly heatsinked via leads |
Pinout & Package
Package: DO-35 (JEITA code GRZZ0002ZB-A), glass axial-leaded, orange body with navy-blue cathode band. Dimensions: φD = 2.0 mm max, L = 26.0 mm min, E = 4.2 mm, mass ≈ 0.13 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | High-potential terminal during reverse breakdown | Connected to regulated output node; polarity must be observed to avoid forward conduction and loss of regulation |
| 2 (Anode) | Low-potential terminal during reverse breakdown | Typically tied to ground or common return; serves as current sink path for zener bias current |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise performance | Diode noise reduced to ~1/3–1/10 of standard HZ series - directly improves SNR in precision ADC references and op-amp bias networks |
| Low zener impedance | 60 Ω max at 3.5 mA - maintains regulation accuracy under varying load currents in feedback loops |
| Stable temperature coefficient | −0.04 %/°C near 6.5 V - reduces thermal drift in battery-powered sensors and portable test equipment |
| High reliability construction | Planar silicon process with glass passivation - ensures long-term stability and low parameter shift in industrial deployments |
Applications
| Instrumentation Reference | Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Precision voltage reference for 24-bit delta-sigma ADCs in portable multimeters and calibration standards. IC Role / Device Role / Timing Role: Provides stable 6.5 V reference rail for ADC internal reference buffer and analog front-end gain stages. Use Value: Low 60 Ω dynamic resistance and −0.04 %/°C TC minimize code-width variation across temperature, improving absolute accuracy to ±0.005 % FS. |
Use Scenario: Bias voltage source for bridge-based pressure and strain sensors in HVAC control modules. IC Role / Device Role / Timing Role: Supplies excitation voltage to Wheatstone bridge while rejecting common-mode noise via low-noise Zener characteristics. Use Value: Diode noise reduction to ~1/10 of standard HZ series lowers RMS noise floor by 10 dB, enabling sub-mV resolution at 10 Hz bandwidth. |
| Regulated Power Feedback | Low-Power Microcontroller Reset |
|
Use Scenario: Secondary-side voltage sense element in isolated flyback converters for industrial PLC power supplies. IC Role / Device Role / Timing Role: Sets feedback threshold for optocoupler-driven regulation loop in 5–24 V output SMPS designs. Use Value: Tight 6.4–6.7 V tolerance and 1 μA leakage at 4 V ensure accurate output tracking without loading error in high-impedance divider networks. |
Use Scenario: Brown-out detection reference for 32-bit ARM Cortex-M microcontrollers in battery-backed data loggers. IC Role / Device Role / Timing Role: Generates precise reset threshold voltage (≈6.5 V) for supervisor ICs monitoring main supply rails. Use Value: Stable −0.04 %/°C TC prevents false resets during ambient temperature swings from −40°C to +85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5231BS | 6.2 V nominal, 100 Ω rd, SOD-123 package, 200 mW Pd | Surface-mount only; higher impedance limits use in high-accuracy feedback loops | Select when board space is constrained and ±5 % VZ tolerance is acceptable |
| Vishay BZX55C6V2 | 6.2 V nominal, 100 Ω rd, DO-35 package, 500 mW Pd, higher noise | Same axial package but lacks low-noise optimization; wider VZ tolerance (±5 %) | Choose for cost-sensitive industrial controls where noise < −100 dBc/Hz is not required |
Compared with HZ7A2LTD-E, MMBZ5231BS offers SMT compatibility but sacrifices 40 % lower dynamic resistance and 3× higher noise; BZX55C6V2 matches DO-35 form factor but trades 67 % higher impedance and uncontrolled noise performance for higher power rating.
Availability
HZ7A2LTD-E is available at Aetrix Electronics and suitable for precision instrumentation, sensor interface design, and regulated power supply feedback applications requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for HZ7A2LTD-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 devices, and trusted system-on-chip solutions for industrial, automotive, and infrastructure markets.
HZ7A2LTD-E belongs to the HZ-L Series low-noise Zener diode family, engineered specifically for high-stability voltage reference applications in test equipment, medical diagnostics, and precision analog signal chains where parameter consistency and noise immunity are critical.
FAQ
What is the exact zener voltage range for HZ7A2LTD-E at 3.5 mA test current?
The HZ7A2LTD-E has a guaranteed zener voltage range of 6.4 V minimum to 6.7 V maximum when tested at IZ = 3.5 mA and Ta = 25°C. This 0.3 V span reflects tight process control for precision reference use, and the nominal value is 6.5 V. The device is not binned beyond this specification, and all units meet this range as shipped.
Does HZ7A2LTD-E support AC-coupled or transient applications?
No - the HZ7A2LTD-E is specified for DC operation only, as explicitly stated in the datasheet Note 1 ("Tested with DC"). It has no rated transient response, surge capability, or AC impedance specifications. Using HZ7A2LTD-E in AC-coupled circuits risks unpredictable behavior due to junction capacitance and lack of characterization under dynamic conditions.
How does the temperature coefficient of HZ7A2LTD-E compare to other 6.2 V Zeners?
HZ7A2LTD-E exhibits a typical temperature coefficient of −0.04 %/°C near its 6.5 V operating point, which is significantly tighter than standard 6.2 V Zeners like BZX55C6V2 (±0.06 %/°C). This improved stability results from process tuning to operate near the zero-TC crossover voltage, making HZ7A2LTD-E preferable in temperature-varying environments where reference drift must stay below 100 ppm/°C.
Can HZ7A2LTD-E be used in parallel for higher power handling?
No - HZ7A2LTD-E must not be paralleled due to mismatch in zener voltage and dynamic resistance between units, which causes current hogging and thermal runaway. Its 400 mW rating is absolute maximum for a single device. For higher power, use a single higher-rated Zener or switch to an active reference IC; paralleling HZ7A2LTD-E violates Renesas' application guidance and voids parametric guarantees.
Is HZ7A2LTD-E compliant with RoHS and REACH requirements?
Yes - HZ7A2LTD-E meets EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, as confirmed by Renesas' material declarations and compliance documentation. The DO-35 package uses lead-free glass and tin-plated copper leads, with no restricted substances above threshold limits. Full compliance reports are available upon request from Aetrix Electronics.
HZ7A2LTD-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:
- -
HZ7A2LTD-E FAQ
1.How can I place an order for HZ7A2LTD-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ7A2LTD-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 HZ7A2LTD-E reliable?
The price and inventory of HZ7A2LTD-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ7A2LTD-E is usually 5 days.
3.What payment methods are accepted for HZ7A2LTD-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ7A2LTD-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ7A2LTD-E?
HZ7A2LTD-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ7A2LTD-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 HZ7A2LTD-E?
For technical support, including HZ7A2LTD-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ7A2LTD-E requirements.
6.How does Aetrix verify that HZ7A2LTD-E is sourced from the original manufacturer or authorized distributors?
All HZ7A2LTD-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 HZ7A2LTD-E meets industry standards.
7.What is the process for return or replacement of HZ7A2LTD-E?
All HZ7A2LTD-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ7A2LTD-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 HZ7A2LTD-E part is unused and in its original packaging.
Return procedure for HZ7A2LTD-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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