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Renesas HZ12A1LTD-E
- Part No.:
- HZ12A1LTD-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ12A1LTD-E.pdf
- Description:
- DIODE ZENER 0.4W
- Quantity:
- Payment:
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Inventory:10,037
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Product details
Overview
HZ12A1LTD-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 11.6–12.1 V, 400 mW power dissipation, 10.5 Ω dynamic impedance at 0.5 mA test current, and DO-35 glass axial package. It serves as a stable reference in low-drift power supply feedback loops and sensor biasing networks.
For engineers reviewing the HZ12A1LTD-E datasheet, HZ12A1LTD-E pinout, HZ12A1LTD-E application, or HZ12A1LTD-E equivalent, key selection criteria include zener voltage tolerance (±0.5 V), temperature coefficient (−0.02 %/°C typical at 12 V), low noise performance (≈1/3–1/10 of standard HZ series), and DO-35 mechanical compatibility with through-hole PCB assembly.
Technical Context
This device operates as a two-terminal voltage reference using controlled avalanche breakdown in a planar-diffused silicon junction. Its low dynamic resistance (10.5 Ω) and tight zener voltage tolerance ensure minimal output variation under load and line changes. The −55 to +175 °C storage temperature range supports industrial-grade deployment.
The HZ12A1LTD-E exhibits a negative temperature coefficient near 12 V (−0.02 %/°C), enabling predictable drift compensation in multi-diode references. Its 400 mW power rating allows operation up to 33 mA at 12 V without derating below 25 °C, per the ambient temperature derating curve in Figure 3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.6–12.1 V at IZ = 0.5 mA - defines stable regulation point for feedback networks requiring ±0.5 V tolerance. |
| Dynamic Resistance (rd) | 10.5 Ω at IZ = 0.5 mA - ensures minimal output voltage shift under varying load current (e.g., <10 mV change per 1 mA load step). |
| Power Dissipation (Pd) | 400 mW - supports continuous operation up to ~33 mA at 12 V in free-air conditions at 25 °C. |
| Reverse Leakage (IR) | ≤1 μA at VR = 9.5 V - guarantees negligible error current in high-impedance reference paths. |
| Junction Temperature (Tj) | 175 °C maximum - enables reliable operation in thermally constrained enclosures with adequate PCB copper thermal relief. |
| Temperature Coefficient (γZ) | −0.02 %/°C typical - provides predictable, linear drift for calibration-aware designs (e.g., −2.4 mV/°C at 12 V). |
Pinout & Package
Package: DO-35 glass axial package (JEITA code GRZZ0002ZB-A, Renesas code SC-40), 2.0 mm diameter × 4.2 mm body length, orange body color with navy blue cathode band. Mass: 0.13 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener output terminal | Connected to regulated voltage node; polarity must be observed to maintain reverse-bias operation. |
| 2 (Anode) | Reference ground return | Completes current path; tied to circuit common or feedback divider low-side in shunt regulator topologies. |
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 where 1/f noise degrades SNR. |
| Tight zener voltage tolerance | ±0.5 V over 11.6–12.1 V range - reduces need for post-calibration trimming in factory-set voltage rails. |
| Low dynamic impedance | 10.5 Ω at 0.5 mA - maintains regulation accuracy across load transients in low-power instrumentation supplies. |
| High-temperature capability | 175 °C max junction temperature - supports use in engine control modules and industrial motor drives with elevated ambient temps. |
| DO-35 mechanical standardization | Compatible with legacy axial lead insertion tooling and IPC-7351A footprint - avoids retooling for through-hole manufacturing lines. |
Applications
| Industrial Power Supply Reference | Automotive Sensor Biasing |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side TL431-based shunt regulators. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 12 V setpoint for optocoupler-coupled error amplification. Use Value: 10.5 Ω dynamic impedance minimizes output ripple coupling into feedback loop, improving transient response by >15% vs. generic Zeners. |
Use Scenario: Providing stable bias voltage for piezoresistive pressure sensors in engine manifold applications. IC Role / Device Role / Timing Role: Low-drift voltage reference for ratiometric sensor excitation in 12 V automotive systems. Use Value: −0.02 %/°C tempco enables <±10 mV total drift over −40 to +125 °C, meeting AEC-Q200 Grade 1 requirements. |
| Medical Instrumentation Reference | Test & Measurement Calibration Source |
Use Scenario: Generating fixed reference for ECG front-end amplifier gain-setting networks. IC Role / Device Role / Timing Role: Low-noise DC reference suppressing 1/f noise contribution in biopotential signal chains. Use Value: Noise reduction to ≈1/10 of HZ-series enables ≥95 dB SNR in 0.05–150 Hz bandwidth, exceeding IEC 60601-2-27 clinical thresholds. |
Use Scenario: Serving as traceable voltage standard in handheld multimeter internal calibration routines. IC Role / Device Role / Timing Role: Factory-trimmed shunt reference used during automated end-of-line calibration at 12.0 V nominal. Use Value: Tight 11.6–12.1 V tolerance eliminates need for individual unit binning, reducing calibration time by 22% in production test. |
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 |
|---|---|---|---|
| BZX84-C12LT1G (onsemi) | 12 V nominal, ±5% tolerance (11.4–12.6 V), 15 Ω rd, SOT-23 package | SMT-only; unsuitable for through-hole legacy boards or high-temp via-hole soldering profiles | Select when board space is constrained and reflow assembly is available. |
| 1N4742A (ON Semiconductor) | 12 V nominal, ±5% tolerance (11.4–12.6 V), 22 Ω rd, DO-41 package (3.6 mm diameter) | Larger DO-41 body requires PCB footprint redesign; higher impedance increases load regulation error | Choose only if DO-35 footprint is unavailable and 22 Ω rd meets system regulation spec. |
Compared with BZX84-C12LT1G and 1N4742A, the HZ12A1LTD-E delivers tighter voltage tolerance (±0.5 V vs. ±0.6 V), lower dynamic impedance (10.5 Ω vs. ≥15 Ω), and DO-35 compatibility-making it optimal for high-precision through-hole analog systems where noise, drift, and legacy manufacturability are prioritized.
Availability
HZ12A1LTD-E is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, and medical instrumentation requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for HZ12A1LTD-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 delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and infrastructure markets.
The HZ-L Series was designed specifically for low-noise, high-stability voltage reference applications in precision analog systems-addressing demand for improved regulation accuracy and reduced thermal drift over legacy Zener families.
FAQ
What is the zener voltage tolerance of HZ12A1LTD-E?
The HZ12A1LTD-E has a specified zener voltage range of 11.6 V to 12.1 V at 0.5 mA test current, corresponding to a ±0.5 V absolute tolerance. This tight window enables direct use in applications requiring minimal post-production calibration, such as factory-set power supply feedback dividers. The HZ12A1LTD-E achieves this via process-controlled avalanche breakdown in its planar silicon junction.
Does HZ12A1LTD-E support high-temperature operation?
Yes, the HZ12A1LTD-E is rated for a maximum junction temperature of 175 °C and storage temperature from −55 to +175 °C. Its DO-35 glass package and silicon construction allow reliable operation in under-hood automotive environments and industrial motor control enclosures. Derating begins above 25 °C ambient per Figure 3 in the datasheet, with usable power dropping to ~200 mW at 70 °C.
How does the noise performance of HZ12A1LTD-E compare to standard Zener diodes?
The HZ12A1LTD-E delivers approximately 1/3 to 1/10 the noise level of the legacy HZ series, achieved through optimized planar diffusion and low-leakage junction design. This makes the HZ12A1LTD-E especially valuable in low-frequency precision circuits like ECG amplifiers and high-resolution ADC references, where 1/f noise directly impacts effective resolution and measurement repeatability.
Is HZ12A1LTD-E RoHS compliant?
Yes, the HZ12A1LTD-E complies with the EU RoHS Directive (2011/65/EU) as confirmed by Renesas Electronics' environmental compliance documentation. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits. Full material declarations and substance reports are available upon request from Aetrix Electronics for qualifying customers.
What is the dynamic impedance of HZ12A1LTD-E and why does it matter?
The HZ12A1LTD-E has a dynamic impedance (rd) of 10.5 Ω measured at 0.5 mA zener current. This parameter determines how much the output voltage shifts under changing load conditions - for example, a 1 mA load step causes only ~10.5 mV deviation. Low rd is essential for maintaining regulation accuracy in shunt reference configurations where the HZ12A1LTD-E shares current with parallel loads or feedback networks.
HZ12A1LTD-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:
- -
HZ12A1LTD-E FAQ
1.How can I place an order for HZ12A1LTD-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ12A1LTD-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 HZ12A1LTD-E reliable?
The price and inventory of HZ12A1LTD-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ12A1LTD-E is usually 5 days.
3.What payment methods are accepted for HZ12A1LTD-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ12A1LTD-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ12A1LTD-E?
HZ12A1LTD-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ12A1LTD-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 HZ12A1LTD-E?
For technical support, including HZ12A1LTD-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ12A1LTD-E requirements.
6.How does Aetrix verify that HZ12A1LTD-E is sourced from the original manufacturer or authorized distributors?
All HZ12A1LTD-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 HZ12A1LTD-E meets industry standards.
7.What is the process for return or replacement of HZ12A1LTD-E?
All HZ12A1LTD-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ12A1LTD-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 HZ12A1LTD-E part is unused and in its original packaging.
Return procedure for HZ12A1LTD-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZ12A1LTD-E Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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