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Renesas HZ9A1LTA-E
- Part No.:
- HZ9A1LTA-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ9A1LTA-E.pdf
- Description:
- DIODE ZENER 0.4W
- Quantity:
- Payment:
- Shipping:
Inventory:75,000
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Product details
Overview
HZ9A1LTA-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 7.7–8.1 V, 400 mW power dissipation, 6.0 Ω dynamic impedance at 0.5 mA test current, and DO-35 glass package with navy-blue cathode band. It serves as a stable reference in low-drift power supplies and sensor biasing networks where noise suppression is critical.
For engineers reviewing the HZ9A1LTA-E datasheet, HZ9A1LTA-E pinout, HZ9A1LTA-E application, or HZ9A1LTA-E equivalent, key selection criteria include its verified low-noise performance (≈1/3–1/10 of standard HZ series), tight zener voltage tolerance, temperature coefficient behavior below ±0.06 %/°C in this voltage range, and suitability for space-constrained through-hole designs requiring stable DC reference under varying thermal conditions.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in a silicon planar junction. Its low dynamic resistance (6.0 Ω) and low leakage (<1 μA at VR = 2.0 V) enable high regulation accuracy in low-current applications such as op-amp reference inputs and ADC voltage references.
The HZ9A1LTA-E exhibits a zener voltage temperature coefficient near zero - approximately −0.04 to −0.06 %/°C per the family curve - making it suitable for ambient-stable biasing where drift must remain under 0.5 mV/°C across industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.7–8.1 V at IZ = 0.5 mA - defines precise DC reference level for feedback or sensing circuits |
| Dynamic Resistance (rd) | 6.0 Ω at IZ = 0.5 mA - ensures minimal output voltage shift under load transients |
| Power Dissipation (Pd) | 400 mW - supports continuous operation up to ~50 mA at 8 V without derating at 25°C |
| Reverse Leakage (IR) | ≤1 μA at VR = 2.0 V - prevents parasitic current draw in high-impedance reference nodes |
| Junction Temperature (Tj) | −55 to +175°C - enables use in extended-temperature industrial environments with appropriate PCB thermal design |
| Noise Level | ≈1/3–1/10 of HZ-series diodes - directly reduces broadband voltage noise in sensitive analog signal chains |
Pinout & Package
Package: DO-35 glass axial leaded package (JEITA code GRZZ0002ZB-A), orange body with 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-side terminal of reverse-biased junction | Connected to regulated positive rail; polarity critical for proper breakdown conduction |
| 2 (Anode) | Low-side terminal of reverse-biased junction | Typically grounded or tied to lower potential; completes bias path for reference current |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise performance | Measured noise reduced to 10–33% of legacy HZ-series diodes - critical for audio preamps and precision instrumentation |
| Tight zener voltage tolerance | ±0.2 V window (7.7–8.1 V) at 0.5 mA - eliminates need for post-regulation trimming in many 8 V reference designs |
| Low dynamic impedance | 6.0 Ω enables <1 mV output shift per 1 mA load change - improves line/load regulation in discrete shunt regulators |
| Stable temperature coefficient | γZ ≈ −0.05 %/°C near 8 V - minimizes drift to <±0.4 mV/°C over −40 to +85°C ambient |
| Robust thermal rating | 175°C max junction temperature - supports operation in sealed enclosures or near heat-generating components |
Applications
| Industrial Sensor Signal Conditioning | Low-Noise Audio Biasing |
|---|---|
|
Use Scenario: Providing stable 8 V bias to MEMS pressure sensor bridge amplifiers in factory automation transmitters. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference establishing common-mode operating point for instrumentation amplifier input stage. Use Value: Low 6.0 Ω impedance and sub-μA leakage prevent gain error and offset drift caused by sensor bridge imbalance currents. |
Use Scenario: Supplying ultra-low-noise bias voltage to JFET-input op-amps in microphone preamplifier front-ends. IC Role / Device Role / Timing Role: Low-noise DC reference source replacing higher-noise Zener alternatives in phantom-power derived rails. Use Value: 1/3–1/10 noise reduction versus standard HZ diodes directly lowers integrated input-referred noise floor by >4 dB. |
| Programmable Logic Controller (PLC) Analog Input Modules | Medical Diagnostic Equipment Reference Supplies |
|
Use Scenario: Generating calibrated 8 V reference for 16-bit SAR ADCs measuring 4–20 mA loop signals in industrial control cabinets. IC Role / Device Role / Timing Role: Precision shunt regulator feeding voltage divider network that sets ADC full-scale range. Use Value: Tight 7.7–8.1 V tolerance and <0.06 %/°C TC ensure ≤0.1% full-scale error across −25 to +70°C operating range. |
Use Scenario: Establishing stable bias for photodiode transimpedance amplifiers in portable blood oximeters. IC Role / Device Role / Timing Role: Low-leakage, low-drift voltage reference enabling accurate photocurrent measurement at picoampere levels. Use Value: ≤1 μA reverse leakage prevents injection error into high-impedance TIA feedback nodes, preserving dynamic range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A (ON Semiconductor) | 8.2 V nominal, 7.74–8.66 V tolerance, 7 Ω rd, 1.0 μA IR, same DO-35 package | Higher noise, wider VZ spread, and less predictable TC - requires tighter layout filtering for low-noise use | Acceptable where cost is primary constraint and noise <−100 dBu is not required |
| BZX85C8V2 (Nexperia) | 8.2 V nominal, 7.7–8.7 V tolerance, 10 Ω rd, 100 nA IR, DO-41 package (larger footprint) | Lower leakage but higher impedance and larger thermal mass - slower transient response and incompatible board cutout | Preferred only when ultra-low leakage dominates over noise and regulation stability |
Compared with 1N4733A and BZX85C8V2, the HZ9A1LTA-E delivers superior noise performance and tighter regulation at 8 V while maintaining identical DO-35 mechanical fit - making it the optimal choice for high-fidelity analog reference paths where both spectral purity and thermal stability are design-critical.
Availability
HZ9A1LTA-E is available at Aetrix Electronics and suitable for industrial sensor conditioning, low-noise audio biasing, PLC analog input modules, and medical diagnostic equipment requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for HZ9A1LTA-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 system-on-chip 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 - emphasizing reduced diode noise, tight zener voltage control, and predictable temperature behavior over broad operating conditions.
FAQ
What is the exact zener voltage range specified for HZ9A1LTA-E?
The HZ9A1LTA-E has a guaranteed zener voltage range of 7.7 V to 8.1 V when tested at IZ = 0.5 mA and Ta = 25°C. This 0.4 V window reflects tighter manufacturing control than standard Zener diodes and enables direct use in 8 V reference designs without external trimming or selection sorting.
Does HZ9A1LTA-E have a documented noise specification, and how does it compare to standard Zeners?
Yes - the HZ-L Series datasheet explicitly states that HZ9A1LTA-E achieves approximately 1/3 to 1/10 the noise level of the legacy HZ series. This is achieved via optimized silicon planar junction processing and is confirmed across the 7.7–8.1 V range, making HZ9A1LTA-E suitable for audio, instrumentation, and sensor signal chains where broadband voltage noise must be minimized.
What is the maximum allowable reverse current before HZ9A1LTA-E exceeds its power rating?
At 25°C ambient, HZ9A1LTA-E can sustain up to 50 mA of reverse current (Pd = 400 mW ÷ 8 V ≈ 50 mA) before exceeding its 400 mW power dissipation limit. However, derating is required above 25°C per the "Power Dissipation vs. Ambient Temperature" curve on page 4 of the datasheet - e.g., maximum IZ drops to ~35 mA at 70°C ambient.
Is HZ9A1LTA-E suitable for surface-mount assembly, or is it strictly through-hole?
HZ9A1LTA-E uses the DO-35 axial glass package with 2.0 mm diameter and 26 mm length, designed exclusively for through-hole mounting. It is not compatible with SMT reflow or wave soldering processes. For surface-mount equivalents, Renesas offers no direct SMT variant of the HZ-L Series; alternative solutions require discrete SOD-123 or SOT-23 Zener families with different noise and tolerance characteristics.
What is the cathode identification method for HZ9A1LTA-E, and why is correct polarity essential?
HZ9A1LTA-E features a navy-blue cathode band at one end of its orange glass body - pin 1 is cathode, pin 2 is anode. Correct polarity is essential because reverse biasing is required for zener operation; forward biasing will cause excessive current flow and permanent damage. Misorientation in circuit assembly results in open-circuit behavior or catastrophic failure under applied voltage.
HZ9A1LTA-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:
- -
HZ9A1LTA-E FAQ
1.How can I place an order for HZ9A1LTA-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ9A1LTA-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 HZ9A1LTA-E reliable?
The price and inventory of HZ9A1LTA-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ9A1LTA-E is usually 5 days.
3.What payment methods are accepted for HZ9A1LTA-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ9A1LTA-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ9A1LTA-E?
HZ9A1LTA-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ9A1LTA-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 HZ9A1LTA-E?
For technical support, including HZ9A1LTA-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ9A1LTA-E requirements.
6.How does Aetrix verify that HZ9A1LTA-E is sourced from the original manufacturer or authorized distributors?
All HZ9A1LTA-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 HZ9A1LTA-E meets industry standards.
7.What is the process for return or replacement of HZ9A1LTA-E?
All HZ9A1LTA-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ9A1LTA-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 HZ9A1LTA-E part is unused and in its original packaging.
Return procedure for HZ9A1LTA-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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