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Renesas HZ12HB2-E
- Part No.:
- HZ12HB2-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
HZ12HB2-E.pdf
- Description:
- DIODE ZENER 12V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,367
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Product details
Overview
HZ12HB2-E from Renesas Electronics is a silicon planar Zener diode optimized for low-noise voltage regulation in precision analog circuits, featuring a nominal zener voltage of 12.6 V, dynamic resistance of 80 Ω at 0.5 mA, maximum power dissipation of 400 mW, and junction temperature rating of 175 °C - deployed in stabilized power supplies and reference circuits for instrumentation.
For engineers reviewing the HZ12HB2-E datasheet, HZ12HB2-E pinout, HZ12HB2-E application, or HZ12HB2-E equivalent, key selection criteria include zener voltage tolerance (±0.5 V), low noise performance relative to legacy HZ series, DO-35 package thermal limits, and temperature coefficient behavior across 12–13 V operating range.
Technical Context
This device operates as a two-terminal voltage reference using controlled avalanche breakdown in a silicon planar junction. Its zener voltage is specified at IZ = 0.5 mA with DC test conditions, and exhibits a typical temperature coefficient of −0.04 %/°C near 12.6 V, confirmed by Figure 2 in REJ03G0182-0300 Rev.3.00.
The HZ12HB2-E belongs to the HZ-L Series, distinguished by 1/3–1/10 lower diode noise versus standard HZ-series Zeners. It is rated for storage between −55 °C and +175 °C and requires derating above 25 °C ambient per Figure 3's power dissipation vs. temperature curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.6 V nominal, 12.4–13.1 V min/max range at IZ = 0.5 mA - defines stable reference point for feedback loops in low-drift regulators. |
| Dynamic Resistance (rd) | 80 Ω max at IZ = 0.5 mA - determines output impedance and load regulation sensitivity in shunt reference configurations. |
| Power Dissipation (Pd) | 400 mW max at Ta = 25 °C - sets absolute upper limit for continuous DC power handling before thermal shutdown or degradation. |
| Junction Temperature (Tj) | 175 °C max - constrains PCB layout thermal design, especially trace width and copper pour under cathode/anode pads. |
| Reverse Leakage (IR) | 1 μA max at VR = 2.0 V - ensures minimal error current in high-impedance bias networks and sensor reference paths. |
| Temperature Coefficient (γZ) | −0.04 %/°C typical at ~12.6 V - enables predictable drift compensation in temperature-stable references up to 85 °C ambient. |
Pinout & Package
Package: DO-35 (JEITA code GRZZ0002ZB-A), glass axial leaded package with orange body color and navy blue cathode band. Dimensions: φD = 2.0 mm, L = 26.0 mm, E = 4.2 mm; mass ≈ 0.13 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | High-impedance reference node | Connected to regulated output or op-amp inverting input; polarity-sensitive - reverse bias required for zener operation. |
| 2 (Anode) | Ground or current sink path | Typically tied to system ground or current-limiting resistor; establishes reference current path and thermal return path. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise Zener operation | Diode noise reduced to 1/3–1/10 of standard HZ-series - critical for audio preamps, ADC reference buffers, and precision DACs. |
| Stable low-impedance reference | 80 Ω dynamic resistance at 0.5 mA - minimizes output voltage shift under varying load or supply ripple conditions. |
| Wide zener voltage range support | Part of HZ-L family spanning 5.2–38 V - allows single-supplier sourcing for multi-rail systems requiring matched noise/temperature behavior. |
| High-temperature reliability | 175 °C max junction temperature - supports operation in enclosed industrial enclosures or near heat-generating components. |
Applications
| Instrumentation Reference | Low-Noise Audio Supply |
|---|---|
|
Use Scenario: Precision multimeter front-end voltage reference requiring <10 ppm/°C drift and sub-μV RMS noise. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 12.6 V node for op-amp gain-setting and ADC calibration circuitry. Use Value: Enables ±0.01% full-scale accuracy over 0–70 °C due to tight VZ tolerance and low γZ. |
Use Scenario: Phantom power regulator in condenser microphone preamplifiers where supply ripple directly modulates signal path. IC Role / Device Role / Timing Role: Low-noise zener clamp stabilizing +12 V rail feeding JFET input stages and active filters. Use Value: Reduces audible hiss by >15 dB compared to standard HZ-series Zeners in same layout. |
| Industrial Sensor Excitation | Programmable Logic Controller (PLC) Analog Input |
|
Use Scenario: Bridge sensor excitation source in strain-gauge transmitters operating in factory-floor environments (−25 to +85 °C). IC Role / Device Role / Timing Role: Temperature-compensated reference for constant-current source driving Wheatstone bridges. Use Value: Maintains excitation stability within ±0.05% over full temperature range via matched γZ and low rd. |
Use Scenario: Isolated analog input channel in modular PLC backplane requiring rail-to-rail reference integrity across multiple modules. IC Role / Device Role / Timing Role: Local shunt reference for 16-bit SAR ADC front-end, decoupled from shared system VREF bus. Use Value: Eliminates crosstalk-induced offset shifts during simultaneous channel sampling due to low leakage (<1 μA) and stable VZ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A (ON Semiconductor) | Zener voltage 12 V ±5%, rd = 9 Ω @ 21 mA, Pd = 1 W, DO-41 package - higher power but higher noise and looser tolerance. | Used in general-purpose power supply regulation, not low-noise analog references. | Select only if higher power handling is required and noise performance is secondary. |
| BZX85C12 (Nexperia) | Zener voltage 12 V ±5%, rd = 25 Ω @ 5 mA, Pd = 1.3 W, DO-41 - better rd than 1N4742A but still 3× noisier than HZ12HB2-E per family data. | Common in automotive body electronics where cost and ruggedness outweigh noise concerns. | Acceptable for non-critical references; avoid in metrology-grade or audio signal chains. |
Compared with 1N4742A and BZX85C12, the HZ12HB2-E delivers superior noise performance and tighter voltage tolerance at lower power, making it uniquely suited for precision analog subsystems where reference integrity directly impacts measurement resolution and signal fidelity.
Availability
HZ12HB2-E is available at Aetrix Electronics and suitable for instrumentation reference, low-noise audio supply, and industrial sensor excitation applications requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.
Supply support for HZ12HB2-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog and power devices, and SoC solutions for industrial, automotive, and infrastructure markets.
The HZ-L Series was developed specifically for low-noise, high-stability voltage reference applications in precision analog systems - addressing limitations in noise and temperature drift found in legacy Zener families like HZ.
FAQ
What is the exact zener voltage range for HZ12HB2-E at 0.5 mA test current?
The HZ12HB2-E has a guaranteed zener voltage range of 12.4 V to 13.1 V when tested at IZ = 0.5 mA and Ta = 25 °C, as specified in the Electrical Characteristics table on page 3 of REJ03G0182-0300 Rev.3.00. This 0.7 V span reflects the B2 variant's binning tolerance and is tighter than standard Zener diodes offering ±5% variation.
Does HZ12HB2-E support DC-only operation, or can it handle AC-coupled or pulsed zener current?
The HZ12HB2-E is characterized and rated exclusively for DC operation, as explicitly noted in the datasheet ("Tested with DC"). Its dynamic resistance and voltage specifications assume steady-state bias; AC or pulsed conditions may induce uncharacterized noise or thermal instability. For HZ12HB2-E, maintain continuous DC current ≥0.5 mA and ≤10 mA to stay within safe operating area.
How does the noise performance of HZ12HB2-E compare to the original HZ series?
Per the HZ-L Series datasheet, the HZ12HB2-E achieves approximately 1/3 to 1/10 lower diode noise than equivalent-voltage parts in the legacy HZ series. This improvement stems from optimized silicon planar junction processing and is validated across the full 5.2–38 V family - making HZ12HB2-E suitable for applications where reference noise contributes measurably to system SNR, such as 24-bit delta-sigma ADCs.
What is the maximum allowable ambient temperature for continuous operation of HZ12HB2-E at full 400 mW dissipation?
The HZ12HB2-E must be operated at or below 25 °C ambient temperature to sustain full 400 mW power dissipation continuously. Above 25 °C, power must be linearly derated per Figure 3 on page 4 of REJ03G0182-0300 Rev.3.00 - e.g., at 70 °C ambient, maximum dissipation drops to ~280 mW. Exceeding this risks irreversible junction degradation.
Is HZ12HB2-E compliant with RoHS and lead-free assembly requirements?
Yes, HZ12HB2-E meets EU RoHS Directive requirements for restricted substances. Renesas confirms environmental compliance in its general notices, and the DO-35 package uses lead-free glass and internal metallization compatible with standard reflow profiles. No exemptions apply, and the device is rated for lead-free soldering per JEDEC J-STD-020.
HZ12HB2-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- HZ(H)
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±2.08%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 35 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 9.5 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
HZ12HB2-E FAQ
1.How can I place an order for HZ12HB2-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ12HB2-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 HZ12HB2-E reliable?
The price and inventory of HZ12HB2-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ12HB2-E is usually 5 days.
3.What payment methods are accepted for HZ12HB2-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ12HB2-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ12HB2-E?
HZ12HB2-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ12HB2-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 HZ12HB2-E?
For technical support, including HZ12HB2-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ12HB2-E requirements.
6.How does Aetrix verify that HZ12HB2-E is sourced from the original manufacturer or authorized distributors?
All HZ12HB2-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 HZ12HB2-E meets industry standards.
7.What is the process for return or replacement of HZ12HB2-E?
All HZ12HB2-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ12HB2-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 HZ12HB2-E part is unused and in its original packaging.
Return procedure for HZ12HB2-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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