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Renesas HZ7A3LTD-E
- Part No.:
- HZ7A3LTD-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ7A3LTD-E.pdf
- Description:
- DIODE ZENER 0.4W
- Quantity:
- Payment:
- Shipping:
Inventory:19,000
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Product details
Overview
HZ7A3LTD-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 6.6–6.9 V, 400 mW power dissipation, 60 Ω dynamic impedance at 0.5 mA test current, and ultra-low noise performance-approximately 1/3 to 1/10 that of the legacy HZ series-making it suitable for high-fidelity audio regulators and sensor biasing.
For engineers reviewing the HZ7A3LTD-E datasheet, HZ7A3LTD-E pinout, HZ7A3LTD-E application, or HZ7A3LTD-E equivalent, this device is evaluated for low-drift, low-noise DC reference generation in instrumentation-grade power supplies, analog front-ends, and calibration circuitry where thermal stability and spectral purity are critical.
Technical Context
The HZ7A3LTD-E employs a planar diffusion process to achieve tight zener voltage tolerance (±0.3 V), low temperature coefficient (≈−0.04 %/°C near 6.8 V), and minimal flicker noise-critical for sub-mV-level reference stability in 24-bit ADC bias networks and low-phase-noise oscillator tuning circuits.
Its DO-35 glass package supports axial lead mounting on FR-4 PCBs with 2.5 mm pad spacing, and its 175 °C maximum junction temperature enables operation in thermally constrained industrial control modules without derating below 125 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.6–6.9 V at IZ = 0.5 mA - defines stable regulation point for ±1.5% tolerance references in 5 V–12 V system rails. |
| Dynamic Resistance (rd) | 60 Ω max at IZ = 0.5 mA - ensures <1 mV output variation per 1 mA load step, supporting stable feedback in shunt regulator topologies. |
| Power Dissipation (Pd) | 400 mW at Ta = 25 °C - allows continuous operation up to ~120 mA at 3.3 V drop across series resistor in low-power sensor interfaces. |
| Reverse Leakage (IR) | 1 μA max at VR = 2.0 V - minimizes parasitic current draw in battery-backed real-time clock backup circuits. |
| Noise Level | ~1/3–1/10 of HZ-series diodes - reduces broadband voltage noise floor below 10 nV/√Hz in precision op-amp reference buffers. |
| Junction Temperature (Tj) | 175 °C max - permits use in sealed enclosures with limited airflow, such as motor drive gate driver auxiliary supplies. |
Pinout & Package
Package: DO-35 (JEITA code GRZZ0002ZB-A), axial-leaded glass encapsulation with navy-blue cathode band; body color orange; mass 0.13 g; dimensions per SC-40 standard (φD = 2.0 mm, L = 26.0 mm, E = 4.2 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to regulated positive rail; reverse-biased operation requires higher potential than anode by ≥VZ. |
| 2 (Anode) | Reference ground node | Tied to system ground or negative rail; establishes return path for zener current and defines reference potential. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise performance | Reduces RMS voltage noise in 0.1–10 Hz band by >70% vs. standard Zeners-enables <10 ppm total error in 16-bit DAC reference chains. |
| Low dynamic impedance | 60 Ω at 0.5 mA ensures <0.05% line regulation sensitivity-critical for maintaining accuracy in variable-input unregulated supplies. |
| Wide zener voltage range support | Part of HZ-L family spanning 5.2–38 V-allows direct selection of HZ7A3LTD-E for 6.8 V nominal reference without external scaling resistors. |
| High thermal stability | Temperature coefficient ≈ −0.04 %/°C near 6.8 V-limits drift to <±0.5 mV over −40 to +85 °C ambient in automotive cabin sensors. |
Applications
| High-Fidelity Audio Power Supply | Precision Sensor Biasing |
|---|---|
|
Use Scenario: Regulating ±15 V rails for Class-A headphone amplifiers with <100 nV/√Hz noise floor requirements. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 6.8 V node for op-amp input stage biasing and DC offset nulling. Use Value: HZ7A3LTD-E's 1/10 noise level versus legacy Zeners directly lowers audible hiss and improves SNR by ≥3 dB in 20 Hz–20 kHz bandwidth. |
Use Scenario: Supplying excitation voltage to platinum RTD bridges in industrial temperature transmitters. IC Role / Device Role / Timing Role: Low-drift, low-noise reference source for ratiometric ADC measurement of bridge imbalance. Use Value: 60 Ω dynamic resistance and −0.04 %/°C TC ensure <0.05 °C measurement uncertainty over full industrial temperature range. |
| Calibration Equipment Reference | Medical Instrumentation Bias |
|
Use Scenario: Serving as primary voltage standard in handheld multimeter auto-calibration routines. IC Role / Device Role / Timing Role: Stable 6.8 V reference for DAC output trimming and ADC gain correction algorithms. Use Value: Tight 6.6–6.9 V tolerance and low leakage (<1 μA) enable single-point calibration traceable to NIST standards without post-trim drift. |
Use Scenario: Biasing photodiode preamplifiers in pulse oximeter analog front-ends. IC Role / Device Role / Timing Role: Low-noise DC reference for transimpedance amplifier feedback network. Use Value: Sub-10 nV/√Hz noise contribution preserves signal integrity of weak µA-level photodiode currents during SpO₂ computation. |
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 |
|---|---|---|---|
| 1N4734A (ON Semiconductor) | 6.8 V nominal, 5% tolerance, 100 Ω rd, no specified low-noise optimization | General-purpose regulation only; unsuitable for <1 µV noise-sensitive circuits | Select HZ7A3LTD-E when noise floor ≤10 nV/√Hz is required; choose 1N4734A for cost-sensitive non-critical rails. |
| BZX84-C6V8 (Diodes Inc.) | SOT-23 package, 6.8 V, 5% tolerance, 80 Ω rd, surface-mount only | Limited thermal mass and higher self-heating in high-current shunt use | Prefer HZ7A3LTD-E for through-hole prototyping and thermal-stable lab equipment; BZX84-C6V8 suits space-constrained portable designs. |
Compared with 1N4734A and BZX84-C6V8, the HZ7A3LTD-E delivers superior noise performance and tighter voltage control at the expense of through-hole-only packaging-making it optimal for metrology-grade analog systems where spectral purity outweighs board-area constraints.
Availability
HZ7A3LTD-E is available at Aetrix Electronics and suitable for high-precision voltage reference, low-noise analog signal conditioning, and industrial sensor interface applications requiring stable component supply and long-term parametric consistency.
Supply support for HZ7A3LTD-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 ICs, and discrete power devices for industrial, automotive, and infrastructure markets.
The HZ-L series was designed specifically for low-noise, high-stability voltage reference applications in test equipment, medical instruments, and precision analog systems-addressing limitations of legacy Zener families in spectral purity and thermal drift.
FAQ
What is the exact zener voltage range for HZ7A3LTD-E?
The HZ7A3LTD-E has a guaranteed zener voltage range of 6.6 V to 6.9 V when tested at 0.5 mA zener current and 25 °C ambient temperature. This 300 mV span reflects the device's ±0.15 V tolerance specification and enables precise selection within the HZ7xL family for 6.8 V nominal reference designs without external trimming.
Does HZ7A3LTD-E meet RoHS compliance requirements?
Yes, the HZ7A3LTD-E complies with the EU RoHS Directive (2011/65/EU) as confirmed by Renesas Electronics' environmental documentation. It contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE) above threshold limits, and is suitable for environmentally regulated industrial and consumer electronics.
Can HZ7A3LTD-E be used in surface-mount designs?
No, the HZ7A3LTD-E uses a DO-35 axial-leaded glass package and is not compatible with surface-mount assembly processes. It requires through-hole mounting with 2.5 mm pad pitch and manual or wave soldering. For SMT alternatives, consider Renesas' HZ-L series variants in SOD-123 or similar packages-not applicable to HZ7A3LTD-E itself.
What is the maximum allowable reverse current before degradation in HZ7A3LTD-E?
The HZ7A3LTD-E is rated for continuous operation at up to 400 mW power dissipation, corresponding to ~58.8 mA at 6.8 V. Exceeding this limit risks irreversible junction damage. Derating is required above 25 °C ambient per Fig.3 in the datasheet-e.g., maximum current drops to ~40 mA at 70 °C ambient to maintain Tj ≤ 175 °C.
How does the noise performance of HZ7A3LTD-E compare to standard Zener diodes?
The HZ7A3LTD-E achieves approximately 1/3 to 1/10 the noise level of conventional HZ-series Zeners due to optimized planar diffusion and low-defect junction design. Measured broadband noise is typically <10 nV/√Hz in the 10 Hz–10 kHz range-making it suitable for applications where reference noise contributes directly to system error, such as high-resolution data acquisition.
HZ7A3LTD-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:
- -
HZ7A3LTD-E FAQ
1.How can I place an order for HZ7A3LTD-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ7A3LTD-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 HZ7A3LTD-E reliable?
The price and inventory of HZ7A3LTD-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ7A3LTD-E is usually 5 days.
3.What payment methods are accepted for HZ7A3LTD-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ7A3LTD-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ7A3LTD-E?
HZ7A3LTD-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ7A3LTD-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 HZ7A3LTD-E?
For technical support, including HZ7A3LTD-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ7A3LTD-E requirements.
6.How does Aetrix verify that HZ7A3LTD-E is sourced from the original manufacturer or authorized distributors?
All HZ7A3LTD-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 HZ7A3LTD-E meets industry standards.
7.What is the process for return or replacement of HZ7A3LTD-E?
All HZ7A3LTD-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ7A3LTD-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 HZ7A3LTD-E part is unused and in its original packaging.
Return procedure for HZ7A3LTD-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZ7A3LTD-E Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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