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Renesas HZ7HB2-E
- Part No.:
- HZ7HB2-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ7HB2-E.pdf
- Description:
- DIODE ZENER FOR STABIL POWER
- Quantity:
- Payment:
- Shipping:
Inventory:9,500
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Product details
Overview
HZ7HB2-E from Renesas is a silicon planar Zener diode optimized for low-noise voltage regulation in precision analog circuits, with a nominal zener voltage of 6.9 V to 7.2 V, 400 mW power dissipation, 60 Ω dynamic resistance at 3.5 mA, and DO-35 glass package. It serves as a stable reference in low-drift power supplies and sensor biasing networks.
For engineers reviewing the HZ7HB2-E datasheet, HZ7HB2-E pinout, HZ7HB2-E application, or HZ7HB2-E equivalent, key selection criteria include zener voltage tolerance (±0.3 V), temperature coefficient (−0.02 %/°C at ~7 V), low noise performance (1/3–1/10 of standard HZ series), and compatibility with through-hole PCB assembly using DO-35 footprint.
Technical Context
The HZ7HB2-E operates as a two-terminal voltage reference device relying on controlled reverse-biased avalanche breakdown. Its low dynamic impedance (60 Ω) and tight zener voltage range (6.9–7.2 V) enable high regulation accuracy under varying load currents up to 3.5 mA.
Designed for DC-stabilized operation, it exhibits a negative temperature coefficient of −0.02 %/°C near 7 V, minimizing thermal drift in reference circuits. The DO-35 package supports axial lead mounting and provides junction-to-ambient thermal resistance suitable for ambient temperatures up to 125°C at full rated power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.9 V min to 7.2 V max at IZ = 3.5 mA - defines stable reference point for feedback loops |
| Power Dissipation (Pd) | 400 mW - sets maximum continuous DC power handling without derating below 25°C |
| Dynamic Resistance (rd) | 60 Ω max at IZ = 3.5 mA - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | 1 μA max at VR = 2.0 V - ensures minimal leakage in high-impedance bias networks |
| Junction Temperature (Tj) | 175°C - defines absolute thermal limit for reliability under sustained power stress |
| Temperature Coefficient (γZ) | −0.02 %/°C - quantifies voltage drift per degree Celsius near nominal VZ |
Pinout & Package
DO-35 glass axial-leaded package with orange body color and navy blue cathode band. Cathode identified by band; anode is unmarked lead.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-bias voltage applied here to initiate zener conduction |
| 2 (Unbanded End) | Anode | Connected to circuit ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise Zener operation | Diode noise level ≈ 1/3–1/10 that of standard HZ series - critical for audio preamps and precision ADC references |
| Stable low-impedance regulation | 60 Ω dynamic resistance at 3.5 mA - enables <10 mV load-induced variation across 1–5 mA current range |
| Wide zener voltage tolerance control | ±0.3 V over 6.9–7.2 V range - supports binning for tighter system-level voltage matching |
| High thermal robustness | 175°C max junction temperature - allows operation in enclosed industrial enclosures without forced cooling |
Applications
| Instrumentation Reference | Low-Noise Audio Biasing |
|---|---|
Use Scenario: Precision voltage reference in 16-bit DAC output buffers requiring sub-10 ppm/°C drift stability. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fixed 7.05 V reference for op-amp offset nulling and gain calibration. Use Value: Low 60 Ω rd and −0.02 %/°C γZ reduce output error to <±2 mV over 0–70°C ambient range. | Use Scenario: DC bias supply for JFET-input microphone preamplifiers where supply ripple must be <5 μV RMS. IC Role / Device Role / Timing Role: Low-noise shunt reference replacing generic 1N4733A to suppress 1/f noise in signal chain front-end. Use Value: 1/3–1/10 lower noise vs. HZ series directly lowers integrated input-referred noise floor by 4–6 dB. |
| Industrial Sensor Excitation | Embedded Microcontroller Reset Circuit |
Use Scenario: Constant-current excitation source for platinum RTD bridges in Class A temperature transmitters. IC Role / Device Role / Timing Role: Zener-clamped current mirror reference ensuring ±0.05% excitation stability over 40–85°C operating range. Use Value: 400 mW Pd and 1 μA IR support stable 1 mA excitation current with <0.1% long-term drift. | Use Scenario: Brown-out detection threshold element in battery-powered IoT nodes with 3.3 V LDO outputs. IC Role / Device Role / Timing Role: Shunt-connected reference feeding comparator input to trigger MCU reset when VCC drops below 7.0 V. Use Value: Tight 6.9–7.2 V VZ window enables accurate 7.0 V trip point with no external resistor divider needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | VZ = 5.1 V nominal, rd = 17 Ω, Pd = 1 W, DO-41 package | Higher power but higher noise and looser VZ tolerance (±5%) - unsuitable for low-drift analog references | Select only if 5.1 V reference and higher power margin are required; not interchangeable due to voltage and noise mismatch |
| BZX55C6V8 | VZ = 6.8 V nominal, rd = 20 Ω, Pd = 500 mW, DO-35 package, no low-noise specification | Similar package and voltage but lacks documented noise reduction - cannot guarantee same analog performance | Acceptable for general-purpose regulation; avoid where noise spectral density or long-term drift are design-critical |
Compared with 1N4733A and BZX55C6V8, the HZ7HB2-E delivers verified low-noise operation and tighter VZ tolerance in a DO-35 package, making it uniquely suited for precision analog reference roles where 7.0 V stabilization and sub-10 nV/√Hz noise matter.
Availability
HZ7HB2-E is available at Aetrix Electronics and suitable for instrumentation reference, low-noise audio biasing, and industrial sensor excitation requiring stable component supply with traceable Renesas manufacturing.
Supply support for HZ7HB2-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 is a global semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.
The HZ-L Series Zener diodes were developed specifically for low-noise, high-stability voltage reference applications in precision analog systems - emphasizing reduced 1/f noise, tight VZ binning, and predictable thermal coefficients.
FAQ
What is the exact zener voltage range specified for HZ7HB2-E?
The HZ7HB2-E has a guaranteed zener voltage range of 6.9 V minimum to 7.2 V maximum when tested at IZ = 3.5 mA and Ta = 25°C. This 0.3 V span reflects factory binning for tighter regulation accuracy than generic Zener diodes, and is confirmed in Renesas document REJ03G0182-0300 page 2.
Does HZ7HB2-E support surface-mount assembly?
No, the HZ7HB2-E uses a DO-35 axial-leaded glass package with 2.0 mm diameter and 26 mm body length, designed exclusively for through-hole PCB mounting. It is not compatible with reflow or wave soldering processes intended for SMD components, and no SMT variant of HZ7HB2-E exists in the HZ-L Series.
What is the maximum reverse current specification for HZ7HB2-E?
The HZ7HB2-E specifies a maximum reverse current (IR) of 1 μA at VR = 2.0 V and Ta = 25°C. This low leakage supports high-impedance bias networks and minimizes error in precision current sources where even nanoamp-level leakage affects accuracy.
How does the noise performance of HZ7HB2-E compare to standard Zener diodes?
The HZ7HB2-E achieves approximately 1/3 to 1/10 the noise level of the legacy HZ series Zener diodes, as stated in the official Renesas datasheet. This low-noise characteristic is process-engineered into the silicon planar structure and verified under DC test conditions - making HZ7HB2-E suitable for audio preamps and high-resolution data acquisition systems.
Is HZ7HB2-E suitable for use in automotive applications?
No, the HZ7HB2-E is not qualified for automotive applications. Renesas explicitly states in the datasheet that products in the HZ-L Series are not designed or tested for safety-critical systems including automotive, aerospace, healthcare, or nuclear environments. Its qualification covers industrial and commercial temperature ranges only.
HZ7HB2-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:
- -
HZ7HB2-E FAQ
1.How can I place an order for HZ7HB2-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ7HB2-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 HZ7HB2-E reliable?
The price and inventory of HZ7HB2-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ7HB2-E is usually 5 days.
3.What payment methods are accepted for HZ7HB2-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ7HB2-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ7HB2-E?
HZ7HB2-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ7HB2-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 HZ7HB2-E?
For technical support, including HZ7HB2-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ7HB2-E requirements.
6.How does Aetrix verify that HZ7HB2-E is sourced from the original manufacturer or authorized distributors?
All HZ7HB2-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 HZ7HB2-E meets industry standards.
7.What is the process for return or replacement of HZ7HB2-E?
All HZ7HB2-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ7HB2-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 HZ7HB2-E part is unused and in its original packaging.
Return procedure for HZ7HB2-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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