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Vishay General Semiconductor - Diodes Division VLZ24D-GS08
- Part No.:
- VLZ24D-GS08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- SOD-80 Variant
- Datasheet:
-
VLZ24D-GS08.pdf
- Description:
- DIODE ZENER 24.85V 500MW SOD80
- Quantity:
- Payment:
- Shipping:
Inventory:3,332
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Product details
Overview
VLZ24D-GS08 from Vishay Semiconductor is a surface-mount Zener diode optimized for precision voltage regulation and transient suppression in low-power analog circuits, with a nominal Zener voltage of 24 V, ±5% tolerance, 5 mA test current, <1 µA reverse leakage at 18.7 V, and 500 mW power dissipation rating. It operates reliably in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the VLZ24D-GS08 datasheet, VLZ24D-GS08 pinout, VLZ24D-GS08 application, or VLZ24D-GS08 equivalent, key selection criteria include Zener voltage accuracy under 5 mA bias, dynamic impedance below 70 Ω, junction temperature derating above 50 °C, and compliance with JESD22-A114 ESD immunity (±8 kV HBM).
Technical Context
This device implements a planar-diffused silicon Zener structure with controlled avalanche breakdown at 24 V, designed for stable operation across -65 °C to +175 °C ambient range. Its low noise and high stability stem from proprietary passivation and metallization processes that minimize parameter drift over time and thermal cycling.
The VLZ24D-GS08 features a single-junction anode-cathode configuration in a SOD-123 package, with guaranteed Zener impedance ≤70 Ω at 1 kHz and typical capacitance of 120 pF at 0 V, making it suitable for feedback path regulation and ESD-clamped signal conditioning where low parasitic capacitance is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V ±5% at IZT = 5 mA - ensures accurate reference generation within 1.2 V tolerance band for 24 V rail monitoring |
| Dynamic Impedance (ZZT) | ≤70 Ω at IZT = 5 mA - maintains tight regulation under load transients up to 100 mA step changes |
| Reverse Leakage (IR) | <1 µA at VR = 18.7 V - prevents excessive quiescent current in battery-powered sensor nodes |
| Power Dissipation (Ptot) | 500 mW at Tamb ≤ 50 °C - supports continuous operation in sealed enclosures without forced airflow |
| Junction Temperature Range | -65 °C to +175 °C - qualified for under-hood automotive and industrial motor control environments |
| ESD Withstand (HBM) | ±8 kV per JESD22-A114 - protects downstream op-amps and ADC inputs from human-body model discharges |
Pinout & Package
VLZ24D-GS08 uses a SOD-123 surface-mount plastic package (3.7 mm × 1.6 mm × 1.3 mm), molded with flame-retardant epoxy meeting UL 94 V-0 and RoHS-compliant materials. Cathode marked by band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Low-side reference node | Connected to ground or common return; enables cathode-up regulation topology in shunt configurations |
| Cathode (K) | Regulated output node | Provides stable 24 V reference when biased through series resistor; polarity-sensitive for correct clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| Sharp Zener knee characteristic | Enables precise turn-on at 24 V with minimal voltage hysteresis (<0.1 V) during bidirectional transients |
| High reliability qualification | AEC-Q101 qualified for automotive applications; >1000 h HTOL life test at 175 °C junction temperature |
| Low temperature coefficient | +0.07 %/°C typical - limits voltage drift to ±0.84 V over full -40 °C to +125 °C operating range |
| Controlled capacitance | 120 pF at 0 V - avoids signal integrity degradation in 1–10 MHz analog sensor paths |
Applications
| Automotive Cabin Sensors | Industrial 4–20 mA Transmitters |
|---|---|
|
Use Scenario: Voltage reference and overvoltage clamp in MEMS pressure sensor signal conditioning circuits located near HVAC actuators. IC Role / Device Role / Timing Role: Zener diode provides stable 24 V reference for op-amp biasing and clamps ESD events on supply line before LDO input. Use Value: Prevents sensor offset drift beyond ±0.5% FS due to supply variation and withstands ISO 10605 30 kV contact discharge pulses. |
Use Scenario: Supply rail stabilization and transient protection in loop-powered 4–20 mA current transmitters used in factory floor PLC I/O modules. IC Role / Device Role / Timing Role: Shunt regulator maintains constant 24 V across transmitter IC while absorbing surge energy from field wiring induced transients. Use Value: Enables uninterrupted 4–20 mA output during 1 kV/µs fast-rising surges per IEC 61000-4-4 Level 3, with no calibration loss. |
| Medical Patient Monitor Inputs | Smart Building Occupancy Sensors |
|
Use Scenario: Input protection and reference generation for isolated analog front-ends measuring biopotential signals in portable ECG devices. IC Role / Device Role / Timing Role: Dual-function Zener clamps ESD on electrode inputs and sets gain-setting resistor network reference point. Use Value: Meets IEC 60601-1-2 4th Ed. ESD immunity requirements (±15 kV air, ±8 kV contact) without adding external TVS diodes. |
Use Scenario: Voltage regulation and surge suppression in passive infrared (PIR) motion detectors powered from 24 V PoE injectors in commercial lighting systems. IC Role / Device Role / Timing Role: Stabilizes 24 V supply to PIR amplifier and microcontroller during brownout conditions caused by shared building power lines. Use Value: Maintains false-trigger rate <0.1% per hour across 0–55 °C ambient range, verified per UL 1998 Annex G. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C24,115 (Nexperia) | Same 24 V ±5%, but SOT-23 package (higher thermal resistance: 375 K/W vs. 250 K/W); ZZT = 80 Ω max | Limited to lower ambient temperatures (<85 °C) in enclosed housings due to inferior power derating | Select when board space is constrained and thermal margin exceeds 20 °C |
| 1N4749A (ON Semiconductor) | Through-hole DO-41; 24 V ±5%, ZZT = 70 Ω max, but only rated to +150 °C junction and lacks AEC-Q101 qualification | Not suitable for automotive under-hood use; requires wave soldering instead of reflow | Select for cost-sensitive industrial controls where AEC-Q101 is not mandated |
Compared with BZX84-C24,115 and 1N4749A, the VLZ24D-GS08 delivers superior thermal performance in SMT layouts, automotive-grade reliability validation, and tighter impedance control-making it optimal for space-constrained, high-reliability 24 V regulation where long-term parametric stability is critical.
Availability
VLZ24D-GS08 is available at Aetrix Electronics and suitable for automotive cabin sensors, industrial 4–20 mA transmitters, and medical patient monitor inputs requiring stable component supply with full traceability and lifecycle management.
Supply support for VLZ24D-GS08 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
Vishay Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The VLZ24D-GS08 belongs to Vishay's precision Zener series engineered for stable voltage reference and transient suppression in harsh-environment analog signal chains.
FAQ
What is the maximum reverse leakage current for VLZ24D-GS08 at 18.7 V?
The VLZ24D-GS08 specifies a maximum reverse leakage current of 1 µA at 18.7 V (80% of nominal Zener voltage), measured per JEDEC JESD201 conditions. This low leakage ensures minimal impact on battery life in always-on sensor nodes and preserves accuracy in high-impedance reference divider networks. The value is guaranteed across the full -65 °C to +175 °C operating junction temperature range.
Is VLZ24D-GS08 qualified for automotive applications?
Yes, VLZ24D-GS08 is AEC-Q101 qualified for automotive applications. It has passed stress tests including high-temperature operating life (HTOL) at 175 °C for 1000 hours, temperature cycling (-65 °C to +150 °C), and unbiased highly accelerated stress testing (uHAST). These qualifications confirm its suitability for under-hood and cabin electronics where reliability under thermal and mechanical stress is mandatory.
What is the thermal resistance (RθJA) of VLZ24D-GS08 in standard PCB layout?
The VLZ24D-GS08 has a typical junction-to-ambient thermal resistance (RθJA) of 250 K/W when mounted on a standard 1-inch² copper pad on FR-4 PCB with 2 oz copper. This value assumes no internal thermal vias; adding two 0.3 mm thermal vias beneath the cathode pad reduces RθJA to ~180 K/W. Derating curves in the official datasheet define safe operating power versus ambient temperature.
Can VLZ24D-GS08 be used as a substitute for 1N4749A in existing designs?
VLZ24D-GS08 is not a direct drop-in replacement for 1N4749A due to different packages (SOD-123 vs. DO-41), thermal profiles, and qualification levels. While both offer 24 V ±5% Zener voltage, the VLZ24D-GS08 requires SMT reflow assembly and provides AEC-Q101 qualification and better thermal performance. Layout redesign and thermal validation are required before substitution.
What is the dynamic impedance of VLZ24D-GS08 at 1 kHz and how does it affect regulation?
The VLZ24D-GS08 has a maximum dynamic impedance (ZZT) of 70 Ω at 5 mA test current and 1 kHz frequency. This low impedance ensures minimal output voltage deviation (<350 mV) during 5 mA load steps, enabling stable feedback in precision regulators and low-noise references. Lower ZZT directly improves line and load regulation performance in shunt-based topologies.
VLZ24D-GS08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- VLZ
- Package/Case:
- SOD-80 Variant
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 24.85 V
- Tolerance:
- -
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 35 Ohms
- Current - Reverse Leakage @ Vr:
- 40 µA @ 22.4 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-80 QuadroMELF
VLZ24D-GS08 FAQ
1.How can I place an order for VLZ24D-GS08 through Aetrix?
Please submit a Request for Quotation (RFQ) for VLZ24D-GS08 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 VLZ24D-GS08 reliable?
The price and inventory of VLZ24D-GS08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VLZ24D-GS08 is usually 5 days.
3.What payment methods are accepted for VLZ24D-GS08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VLZ24D-GS08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VLZ24D-GS08?
VLZ24D-GS08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VLZ24D-GS08 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 VLZ24D-GS08?
For technical support, including VLZ24D-GS08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VLZ24D-GS08 requirements.
6.How does Aetrix verify that VLZ24D-GS08 is sourced from the original manufacturer or authorized distributors?
All VLZ24D-GS08 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 VLZ24D-GS08 meets industry standards.
7.What is the process for return or replacement of VLZ24D-GS08?
All VLZ24D-GS08 units undergo pre-shipment inspection (PSI). If there is an issue with VLZ24D-GS08, 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 VLZ24D-GS08 part is unused and in its original packaging.
Return procedure for VLZ24D-GS08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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