My Inquiry
My Account
Renesas HZ9A2LTD-E
- Part No.:
- HZ9A2LTD-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZ9A2LTD-E.pdf
- Description:
- DIODE ZENER 0.4W
- Quantity:
- Payment:
- Shipping:
Inventory:22,500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
HZ9A2LTD-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 7.9–8.3 V, 400 mW power dissipation, and dynamic resistance of 60 Ω at 0.5 mA test current. It is used in stabilized power supplies, reference voltage sources, and noise-sensitive instrumentation where low diode noise (≈1/3–1/10 that of standard HZ series) and tight voltage tolerance are critical.
For engineers reviewing the HZ9A2LTD-E datasheet, HZ9A2LTD-E pinout, HZ9A2LTD-E application, or HZ9A2LTD-E equivalent, key selection criteria include its DO-35 package, cathode-band polarity marking, low temperature coefficient (≈−0.02 %/°C near 8 V), and suitability for low-current (<1 mA) precision biasing and voltage clamping in industrial and office equipment.
Technical Context
This device operates as a two-terminal, DC-biased voltage reference using avalanche breakdown in a planar-diffused silicon junction. Its low-noise performance stems from optimized doping profile and passivation, reducing flicker (1/f) noise components compared to legacy HZ-series diodes. The zener voltage is specified at IZ = 0.5 mA with ±0.2 V tolerance across the HZ9A2L variant group.
Thermal stability is characterized by a negative temperature coefficient near −0.02 %/°C (≈−1.6 mV/°C) at 8 V, enabling predictable drift compensation in multi-device references. Absolute maximum ratings include Tj = 175°C and Pd = 400 mW at Ta = 25°C, derating linearly above 25°C per the published curve (Fig.3).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.9–8.3 V at IZ = 0.5 mA - defines stable regulation point for low-current 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 at Ta = 25°C - supports continuous operation in compact PCB layouts with adequate heatsinking |
| Reverse Leakage (IR) | 1 μA max at VR = 2.0 V - enables high-impedance sensing and low-quiescent-current designs |
| Temperature Coefficient (γZ) | ≈−0.02 %/°C near 8 V - allows predictable thermal drift modeling in reference circuits |
| Junction Temperature (Tj) | 175°C max - permits operation in elevated ambient environments with proper thermal design |
Pinout & Package
The HZ9A2LTD-E is housed in a DO-35 glass axial package (Renesas code GRZZ0002ZB-A, JEITA SC-40), with orange body color and navy-blue cathode band marking. Total mass is 0.13 g; lead spacing (E) is 4.2 mm nominal; body diameter (φD) is 2.0 mm max; length (L) is 26.0 mm min.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | High-side terminal for reverse-bias connection | Connected to regulated positive rail; polarity must be observed to avoid forward conduction |
| 2 (Anode) | Low-side terminal, typically grounded or tied to lower potential | Serves as reference return path; establishes current flow direction for zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low diode noise | ≈1/3–1/10 of standard HZ series - directly improves SNR in audio preamps and sensor front-ends |
| Low zener impedance | 60 Ω max at 0.5 mA - maintains regulation accuracy under varying load currents up to ~1 mA |
| Wide zener voltage range | 5.2–38 V across HZ-L family - enables single-supplier sourcing for multiple reference voltages |
| Stable temperature coefficient | Negative γZ ≈−0.02 %/°C at 8 V - simplifies thermal drift compensation in multi-diode references |
| High reliability packaging | DO-35 glass-sealed construction - provides hermetic protection against moisture and contaminants in industrial environments |
Applications
| Industrial Power Monitoring | Audio Signal Conditioning |
|---|---|
Use Scenario: Real-time voltage supervision in PLC analog input modules monitoring 0–10 V sensor signals. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 8.2 V reference for ADC bias and comparator thresholds. Use Value: Low noise and tight VZ tolerance ensure <±0.5% measurement accuracy over temperature and time. |
Use Scenario: DC offset nulling and bias stabilization in high-fidelity microphone preamplifier stages. IC Role / Device Role / Timing Role: Low-noise zener reference for op-amp input stage biasing and common-mode level setting. Use Value: Diode noise reduction preserves signal integrity in sub-10 μV RMS audio paths without requiring complex filtering. |
| Office Equipment Power Supplies | Test & Measurement Calibration |
Use Scenario: Secondary-side voltage regulation in low-power AC/DC adapters for printers and scanners. IC Role / Device Role / Timing Role: Shunt regulator maintaining stable 8.0 V rail for logic-level translation and microcontroller reset circuitry. Use Value: 400 mW rating and low leakage support reliable operation across universal input ranges (90–264 VAC) with minimal heat rise. |
Use Scenario: Fixed-voltage reference in handheld multimeter front-end attenuators and autoranging circuits. IC Role / Device Role / Timing Role: Primary voltage reference for scaling and calibration of 3½-digit DMM analog sections. Use Value: Stable γZ and low rd enable <±10 ppm/°C drift performance without active temperature compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5231BLT1G | Zener voltage 5.1 V, SOT-23 package, 225 mW rating, rd = 17 Ω | Lower voltage, surface-mount only, higher power density but less thermal mass | Select when board space is constrained and 5.1 V reference suffices; not interchangeable due to voltage and package mismatch |
| Vishay BZX84-C8V2 | Zener voltage 8.2 V, SOT-23 package, 300 mW rating, rd = 35 Ω, noise not specified | Similar VZ, but no documented low-noise optimization; higher rd limits regulation fidelity | Acceptable for general-purpose clamping; avoid where noise floor or regulation stability below 100 nV/√Hz is required |
Compared with MMBZ5231BLT1G and BZX84-C8V2, the HZ9A2LTD-E delivers superior low-noise performance and tighter VZ tolerance in a through-hole DO-35 package ideal for prototyping and industrial repair, while trading off SMT compatibility and ultra-low rd.
Availability
HZ9A2LTD-E is available at Aetrix Electronics and suitable for industrial power monitoring, audio signal conditioning, office equipment power supplies, and test & measurement calibration requiring stable component supply and long-term obsolescence management.
Supply support for HZ9A2LTD-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 consumer markets.
The HZ-L Series was designed specifically for low-noise, precision voltage reference applications in industrial and office equipment-addressing limitations of earlier HZ-series diodes in noise-sensitive analog signal chains.
FAQ
What is the zener voltage tolerance of HZ9A2LTD-E?
The HZ9A2LTD-E has a zener voltage range of 7.9 V to 8.3 V at IZ = 0.5 mA, corresponding to a ±0.2 V absolute tolerance. This specification is confirmed in the Renesas REJ03G0182-0300 datasheet, Page 2, Electrical Characteristics table. The tolerance reflects process control for the "A2" variant within the HZ9xxL family and is tighter than many generic 8.2 V Zeners.
Is HZ9A2LTD-E suitable for automotive applications?
No, the HZ9A2LTD-E is rated as a Standard-grade Renesas product intended for computers, office equipment, communications gear, and industrial robots-not for automotive or safety-critical systems. Its qualification does not meet AEC-Q200, and Renesas explicitly restricts use in transportation equipment without prior written consent per Quality Grade Notice (Page 1, Section 7).
What is the maximum reverse current specification for HZ9A2LTD-E?
The HZ9A2LTD-E specifies a maximum reverse leakage current (IR) of 1 μA at VR = 2.0 V, per the Electrical Characteristics table on Page 2 of the REJ03G0182-0300 datasheet. This low leakage supports high-impedance bias networks and minimizes error in precision current-source applications using the HZ9A2LTD-E.
Does HZ9A2LTD-E have a specified noise spectral density?
The HZ9A2LTD-E datasheet states its noise level is "approximately 1/3–1/10 lower than the HZ series" but does not publish quantitative noise spectral density (e.g., nV/√Hz). This comparative claim is based on Renesas' internal low-noise process optimization and is validated across the full HZ-L family, including the HZ9A2LTD-E.
What is the thermal resistance (RθJA) of HZ9A2LTD-E in DO-35 package?
The datasheet does not specify RθJA for HZ9A2LTD-E. However, Fig.3 (Page 4) provides the derating curve: power dissipation drops linearly from 400 mW at 25°C to 0 mW at ~150°C ambient. For PCB-mounted DO-35 devices on FR-4 with 20 mm lead length, typical RθJA is ~350°C/W - meaning the HZ9A2LTD-E junction rises ~140°C above ambient at full 400 mW.
HZ9A2LTD-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:
- -
HZ9A2LTD-E FAQ
1.How can I place an order for HZ9A2LTD-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZ9A2LTD-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 HZ9A2LTD-E reliable?
The price and inventory of HZ9A2LTD-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZ9A2LTD-E is usually 5 days.
3.What payment methods are accepted for HZ9A2LTD-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZ9A2LTD-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZ9A2LTD-E?
HZ9A2LTD-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZ9A2LTD-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 HZ9A2LTD-E?
For technical support, including HZ9A2LTD-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZ9A2LTD-E requirements.
6.How does Aetrix verify that HZ9A2LTD-E is sourced from the original manufacturer or authorized distributors?
All HZ9A2LTD-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 HZ9A2LTD-E meets industry standards.
7.What is the process for return or replacement of HZ9A2LTD-E?
All HZ9A2LTD-E units undergo pre-shipment inspection (PSI). If there is an issue with HZ9A2LTD-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 HZ9A2LTD-E part is unused and in its original packaging.
Return procedure for HZ9A2LTD-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZ9A2LTD-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
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
