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Vishay General Semiconductor - Diodes Division BZX84C24-G3-18
- Part No.:
- BZX84C24-G3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C24-G3-18.pdf
- Description:
- DIODE ZENER 24V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:958
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Product details
Overview
BZX84C24-G3-18 from Vishay Semiconductors is a silicon planar Zener diode rated for 24 V nominal zener voltage (±5 % tolerance), 5 mA test current, 0.05 μA reverse leakage at 19.2 V, 16.8 Ω dynamic resistance at 5 mA, and 8 × 10⁻⁴/°C positive temperature coefficient - used for precision voltage regulation and overvoltage protection in low-power analog and digital supply rails.
For engineers reviewing the BZX84C24-G3-18 datasheet, BZX84C24-G3-18 pinout, BZX84C24-G3-18 application, or BZX84C24-G3-18 equivalent, this device serves as a stable, SOT-23-packaged reference element in power management, sensor biasing, and ESD-clamped interface circuits where ±5 % voltage accuracy and 150 °C junction operation are required.
Technical Context
The BZX84C24-G3-18 operates as a single-element, unidirectional Zener diode with avalanche breakdown mechanism, optimized for stable DC voltage reference and shunt regulation. Its 24 V nominal zener voltage is specified at 5 mA test current (IZT1), with dynamic resistance of 16.8 Ω measured at 1 kHz.
It features a positive temperature coefficient (+8 × 10⁻⁴/°C) ensuring predictable voltage drift over temperature, and meets AEC-Q101 ESD requirements (>8 kV HBM, >800 V MM) - though this specific variant (G3-18) is commercial-grade, not AEC-Q101 qualified.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V min. to 25.2 V max. at 5 mA - defines tight regulation window for 24 V rail clamping or reference generation |
| Test Current (IZT) | 5 mA - standard operating point for guaranteed VZ specification and dynamic resistance measurement |
| Dynamic Resistance (ZZ) | 16.8 Ω at 5 mA, 1 kHz - determines small-signal impedance and load regulation sensitivity |
| Reverse Leakage (IR) | 0.05 μA max. at 19.2 V - ensures minimal quiescent current draw below breakdown |
| Power Dissipation (Ptot) | 300 mW on FR-4 board - sets maximum continuous shunt power before thermal derating applies |
| Operating Temperature | -55 °C to +150 °C - supports industrial and under-hood automotive environments without derating |
| Thermal Resistance (RthJA) | 420 K/W on FR-4 - enables thermal modeling for PCB layout and ambient temperature margining |
Pinout & Package
SOT-23 surface-mount package (9.2 mg weight, UL 94 V-0 molding compound, MSL level 1); three-terminal configuration with anode, cathode, and unused lead (pin 3 is internal connection or dummy terminal per Vishay SOT-23 mechanical drawing).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node; current flows into cathode during reverse-bias conduction |
| Pin 2 | Cathode | Connected to regulated/higher-potential node; primary terminal for zener voltage reference output |
| Pin 3 | Internal connection / dummy | No external circuit function; tied internally to cathode or left floating per die design - not usable as signal terminal |
Key Features
| Feature | Design Value |
|---|---|
| Silicon planar construction | Ensures repeatable breakdown characteristics and long-term stability vs. alloyed or diffused junctions |
| E24-standard voltage grading | Enables precise selection across 2.2–75 V range with consistent 5 % tolerance ('C' suffix) |
| Green-compliant packaging (G3) | Meets RoHS Directive 2011/65/EU and halogen-free material requirements for environmental compliance |
| ESD robustness | Withstands >8 kV HBM and >800 V MM - reduces need for external ESD protection in I/O line clamping |
| Low leakage at sub-zener voltage | 0.05 μA max. at 80 % VZ - minimizes standby current in battery-powered voltage monitor circuits |
Applications
| Industrial Power Monitoring | Automotive Sensor Biasing |
|---|---|
Use Scenario: Monitoring 24 V vehicle battery rail for undervoltage/overvoltage conditions in body control modules. IC Role / Device Role / Timing Role: Shunt regulator providing stable 24 V reference for comparator input. Use Value: Enables accurate threshold detection within ±5 % across -40 °C to +125 °C ambient with no active components. |
Use Scenario: Biasing a Hall-effect position sensor requiring stable 24 V excitation in transmission control units. IC Role / Device Role / Timing Role: Precision voltage clamp maintaining sensor supply within spec despite alternator ripple. Use Value: Delivers <0.05 μA leakage and 16.8 Ω dynamic impedance to minimize sensor output drift. |
| Programmable Logic Supply Clamp | IoT Node Voltage Reference |
Use Scenario: Protecting FPGA I/O banks powered from a 24 V intermediate rail converted to 3.3 V via LDO. IC Role / Device Role / Timing Role: Overvoltage clamp absorbing transient energy on the 24 V input side. Use Value: Absorbs up to 300 mW continuously while maintaining 24 V regulation - preventing LDO input overvoltage failure. |
Use Scenario: Providing reference voltage for ADC measurement of 24 V solar panel output in edge gateway devices. IC Role / Device Role / Timing Role: Passive voltage reference with known temperature coefficient for calibration compensation. Use Value: +8 × 10⁻⁴/°C TC allows firmware-based linear correction of ADC readings across operating temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5249BS-7-F | 24 V nominal, ±5 %, SOT-23, 225 mW Ptot, 20 Ω ZZ at 20 mA - higher test current, lower power rating | Less suitable for continuous 300 mW dissipation; better for low-current reference than high-energy clamping | Select when lower dynamic impedance at higher current is prioritized over absolute power handling |
| 1N4749A | 24 V nominal, ±5 %, DO-41 package, 1 W Ptot, 20 Ω ZZ at 10.5 mA - through-hole, higher power, larger footprint | Requires PCB real estate and wave soldering; unsuitable for dense SMT layouts or automated assembly | Select only for legacy through-hole designs or where >300 mW surge capability is mandatory |
Compared with MMBZ5249BS-7-F and 1N4749A, the BZX84C24-G3-18 offers optimal balance of SMT compatibility, 300 mW on-board dissipation, and 16.8 Ω dynamic resistance at industry-standard 5 mA test current - making it preferred for space-constrained, medium-power regulation tasks.
Availability
BZX84C24-G3-18 is available at Aetrix Electronics and suitable for industrial power monitoring, automotive sensor biasing, programmable logic supply clamp, and IoT node voltage reference applications requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for BZX84C24-G3-18 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 Semiconductors is a global manufacturer specializing in discrete semiconductors, passive components, and sensors - with emphasis on reliability, precision, and automotive-grade qualification.
The BZX84-G series targets cost-sensitive, high-volume applications needing stable, standardized Zener references in compact SOT-23 packages - designed for industrial controls, consumer power supplies, and automotive subsystems.
FAQ
What is the zener voltage tolerance for BZX84C24-G3-18?
The BZX84C24-G3-18 has a nominal zener voltage of 24 V with a tolerance of ±5 %, as indicated by the "C" in the part number. This means the actual measured VZ falls between 22.8 V and 25.2 V when tested at 5 mA (IZT1) and 25 °C ambient temperature - confirmed in Vishay's official datasheet revision 1.1.
Is BZX84C24-G3-18 AEC-Q101 qualified?
No, the BZX84C24-G3-18 is not AEC-Q101 qualified. It belongs to the commercial-grade G3 series. While the BZX84-G family offers AEC-Q101-qualified variants (with part numbers provided on request), the "G3-18" suffix specifically denotes green-compliant, non-automotive-qualified production.
What is the maximum power dissipation for BZX84C24-G3-18 on a standard FR-4 PCB?
The BZX84C24-G3-18 is rated for 300 mW maximum power dissipation when mounted on an FR-4 printed circuit board using Vishay's recommended soldering footprint. This value assumes natural convection cooling and is derated above 25 °C ambient per the admissible power dissipation curve in the datasheet.
Does BZX84C24-G3-18 have a defined pin 3 function in the SOT-23 package?
In the SOT-23 package used for BZX84C24-G3-18, pin 3 is an internal connection or dummy terminal with no external circuit function. Vishay's mechanical drawings confirm it is either tied to the cathode or left floating - it must not be used as an active signal terminal in layout or schematic design.
What is the temperature coefficient of BZX84C24-G3-18, and how does it affect regulation?
The BZX84C24-G3-18 has a temperature coefficient of +8 × 10⁻⁴/°C at 5 mA test current, meaning its zener voltage increases by approximately 19.2 mV per °C rise in junction temperature. This positive TC enables predictable, linear drift - useful for temperature-compensated reference designs where firmware correction is applied.
BZX84C24-G3-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- BZX84-G
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.8 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C24-G3-18 FAQ
1.How can I place an order for BZX84C24-G3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C24-G3-18 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 BZX84C24-G3-18 reliable?
The price and inventory of BZX84C24-G3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C24-G3-18 is usually 5 days.
3.What payment methods are accepted for BZX84C24-G3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C24-G3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C24-G3-18?
BZX84C24-G3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C24-G3-18 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 BZX84C24-G3-18?
For technical support, including BZX84C24-G3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C24-G3-18 requirements.
6.How does Aetrix verify that BZX84C24-G3-18 is sourced from the original manufacturer or authorized distributors?
All BZX84C24-G3-18 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 BZX84C24-G3-18 meets industry standards.
7.What is the process for return or replacement of BZX84C24-G3-18?
All BZX84C24-G3-18 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C24-G3-18, 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 BZX84C24-G3-18 part is unused and in its original packaging.
Return procedure for BZX84C24-G3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C24-G3-18 Tags
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