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Renesas HZ7A2L91TA
- Part No.:
- HZ7A2L91TA
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ7A2L91TA.pdf
- Description:
- DIODE ZENER 0.4W
- Quantity:
- Payment:
- Shipping:
Inventory:675,000
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Product details
Overview
HZ7A2L91TA from Renesas is a silicon planar Zener diode optimized for low-noise voltage regulation in precision analog circuits, featuring a nominal zener voltage of 6.5 V (min 6.4 V / max 6.7 V), dynamic resistance of 60 Ω at 0.5 mA, maximum power dissipation of 400 mW, and junction temperature rating up to 175°C. It is used in stabilized reference supplies for instrumentation amplifiers and sensor signal conditioning.
For engineers reviewing the HZ7A2L91TA datasheet, HZ7A2L91TA pinout, HZ7A2L91TA application, or HZ7A2L91TA equivalent, this page delivers verified electrical parameters, DO-35 package mapping, cathode/anode terminal roles, low-noise design context, and two validated alternative Zener diodes with documented voltage and impedance differences.
Technical Context
This device operates as a two-terminal voltage reference using silicon planar Zener breakdown at 6.5 V nominal, with noise performance approximately 1/3–1/10 lower than standard HZ-series diodes. Its low leakage current (<1 μA at VR = 2.0 V) and tight zener voltage tolerance support stable biasing in low-power analog front-ends.
The HZ7A2L91TA exhibits a zener voltage temperature coefficient of −0.02 %/°C (≈−1.3 mV/°C) near 6.5 V, enabling predictable drift behavior in ambient temperature ranges from −55°C to +175°C. Its DO-35 glass package ensures hermetic sealing and thermal stability suitable for industrial-grade reference designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.4 V min / 6.7 V max at IZ = 0.5 mA - defines stable reference point for ±0.15 V tolerance in precision bias networks |
| Dynamic Resistance (rd) | 60 Ω max at IZ = 0.5 mA - ensures minimal output impedance variation under load transients |
| Power Dissipation (Pd) | 400 mW max at Ta = 25°C - supports continuous operation in compact PCB layouts without forced cooling |
| Junction Temperature (Tj) | 175°C max - enables reliable use in high-temperature industrial environments including motor control enclosures |
| Reverse Leakage (IR) | 1 μA max at VR = 2.0 V - minimizes error current in high-impedance reference divider chains |
| Package | DO-35 (GRZZ0002ZB-A) - industry-standard axial glass package with orange body and navy-blue cathode band |
Pinout & Package
Package: DO-35 glass axial package (JEITA code SC-40), 2.0 mm diameter × 26.0 mm length, 0.13 g mass, orange body with navy-blue cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown anode connection point | Connected to higher-potential node in reverse-biased configuration; marked by navy-blue band |
| 2 (Anode) | Zener breakdown cathode connection point | Connected to lower-potential node (typically ground or common rail); unmarked end |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise Zener operation | Noise level ≈1/3–1/10 that of standard HZ series - critical for audio preamps and ADC reference buffers |
| Tight zener voltage tolerance | ±0.15 V at 6.5 V nominal - reduces calibration burden in factory-trimmed sensor modules |
| Stable temperature coefficient | −0.02 %/°C (≈−1.3 mV/°C) - enables predictable drift compensation in wide-temperature-range instrumentation |
| Hermetic DO-35 packaging | SC-40 glass envelope with 0.13 g mass - provides long-term parameter stability and moisture resistance |
| High junction temperature rating | 175°C max - allows placement near heat-generating components without derating concerns |
Applications
| Instrumentation Amplifier Reference | Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 6.5 V reference for gain-setting resistors and offset trimming in precision op-amp circuits. IC Role / Device Role / Timing Role: Low-noise voltage reference source for analog signal path biasing. Use Value: 60 Ω dynamic resistance and sub-μA leakage minimize reference error contribution in 16-bit+ data acquisition systems. |
Use Scenario: Biasing bridge sensors (e.g., strain gauges, RTDs) in industrial process monitoring nodes. IC Role / Device Role / Timing Role: Stable excitation voltage source with minimal thermal drift. Use Value: −0.02 %/°C tempco ensures <±0.1% reference shift over −40°C to +85°C ambient range. |
| Low-Power Analog Front-End | Industrial Power Supply Monitoring |
Use Scenario: Generating regulated bias for micropower comparators and voltage supervisors in battery-powered IoT edge nodes. IC Role / Device Role / Timing Role: Low-quiescent-current Zener reference for ultra-low-power analog subsystems. Use Value: 1 μA max reverse leakage at 2.0 V enables >10-year battery life in always-on sensing applications. |
Use Scenario: Monitoring 12 V rail integrity in PLC backplanes using resistor-divider + comparator architecture. IC Role / Device Role / Timing Role: Precision threshold reference for overvoltage/undervoltage detection. Use Value: 400 mW power rating supports robust operation during transient surges without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C6V2 (Diodes Inc.) | Zener voltage 6.2 V (±5%), rd = 70 Ω @ 5 mA, Pd = 300 mW, SOT-23 package | Higher dynamic resistance and lower power rating; surface-mount only | Select when board space is constrained and 6.2 V reference suffices with relaxed noise requirements |
| MMSZ4687 (ON Semiconductor) | Zener voltage 6.8 V (±5%), rd = 50 Ω @ 1 mA, Pd = 350 mW, SOD-123 package | 0.3 V higher nominal voltage; tighter rd but lower power handling | Choose for improved impedance performance where 6.8 V reference aligns with system headroom constraints |
Compared with BZX84-C6V2 and MMSZ4687, the HZ7A2L91TA offers superior low-noise performance, higher power margin (400 mW), and axial DO-35 through-hole compatibility-making it preferred for legacy industrial designs and noise-sensitive analog references where 6.5 V is required.
Availability
HZ7A2L91TA is available at Aetrix Electronics and suitable for stabilized power supply references, precision sensor biasing, and industrial analog front-end designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for HZ7A2L91TA 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 Technology Corp. is a Japanese semiconductor manufacturer specializing in microcontrollers, analog mixed-signal ICs, and discrete 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 test equipment, medical instrumentation, and industrial control systems demanding precise DC biasing.
FAQ
What is the exact zener voltage range for HZ7A2L91TA?
The HZ7A2L91TA has a guaranteed zener voltage range of 6.4 V minimum to 6.7 V maximum when tested at IZ = 0.5 mA and Ta = 25°C. This 6.5 V nominal rating is confirmed in Renesas document REJ03G0182-0300 Rev.3.00, Page 2, and applies specifically to the HZ7A2L variant within the HZ-L family.
Does HZ7A2L91TA have a specified noise performance metric?
Yes - the HZ7A2L91TA features approximately 1/3 to 1/10 lower diode noise than standard HZ-series Zeners, as stated in the "Features" section of the Renesas datasheet (REJ03G0182-0300, Page 1). This low-noise characteristic is intrinsic to the silicon planar construction and process optimization of the HZ-L Series.
What is the cathode identification method for HZ7A2L91TA?
The cathode of the HZ7A2L91TA is identified by a navy-blue band on the orange-colored DO-35 glass body. Pin 1 (cathode) is the banded end, while Pin 2 (anode) is the unmarked end - consistent with JEITA SC-40 package conventions and confirmed in the "Pin Arrangement" diagram on Page 1 of the datasheet.
Can HZ7A2L91TA be used in surface-mount designs?
No - the HZ7A2L91TA is packaged exclusively in the axial DO-35 (GRZZ0002ZB-A) through-hole format. It lacks surface-mount variants such as SOD-123 or SOT-23. For SMT-compatible alternatives with similar voltage ratings, consider MMSZ4687 or BZX84-C6V2, though these differ in noise, power, and temperature behavior.
What is the maximum allowable reverse voltage before breakdown for HZ7A2L91TA?
The HZ7A2L91TA is rated for reverse current testing up to VR = 2.0 V, with leakage current limited to 1 μA maximum at that voltage. Breakdown occurs at its specified zener voltage (6.4–6.7 V), and operation below 2.0 V reverse bias ensures negligible conduction - making it suitable for clamping or protection roles only when paired with appropriate series resistance.
HZ7A2L91TA 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:
- -
HZ7A2L91TA FAQ
1.How can I place an order for HZ7A2L91TA through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ7A2L91TA 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 HZ7A2L91TA reliable?
The price and inventory of HZ7A2L91TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ7A2L91TA is usually 5 days.
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Once your HZ7A2L91TA 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 HZ7A2L91TA?
For technical support, including HZ7A2L91TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ7A2L91TA requirements.
6.How does Aetrix verify that HZ7A2L91TA is sourced from the original manufacturer or authorized distributors?
All HZ7A2L91TA 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 HZ7A2L91TA meets industry standards.
7.What is the process for return or replacement of HZ7A2L91TA?
All HZ7A2L91TA units undergo pre-shipment inspection (PSI). If there is an issue with HZ7A2L91TA, 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 HZ7A2L91TA part is unused and in its original packaging.
Return procedure for HZ7A2L91TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZ7A2L91TA Tags
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MM5Z5V1ST1G
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