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onsemi BZX84C24ET1G
- Part No.:
- BZX84C24ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C24ET1G.pdf
- Description:
- DIODE ZENER 24V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:6,370
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Product details
Overview
BZX84C24ET1G from onsemi is a 24 V ±5% Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board, with 70 Ω dynamic impedance at 5 mA test current and 0.05 µA reverse leakage at 19.2 V. It provides precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the BZX84C24ET1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal behavior, ESD robustness (Class 3, >16 kV HBM), and real-world use cases in voltage reference and overvoltage protection circuits.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to clamp voltage at its nominal Zener voltage of 24 V. Its temperature coefficient is +18.4 mV/°C, indicating positive drift with rising junction temperature, and it exhibits 80 pF capacitance at 0 V bias and 1 MHz.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode) and supports automated placement. Thermal resistance is 500 °C/W on FR-5 board, limiting continuous power handling without derating above 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V to 25.6 V @ 5 mA - defines clamping range for overvoltage protection or reference stability |
| Power Dissipation | 250 mW on FR-5 board - sets maximum continuous DC power before thermal shutdown risk |
| Zener Impedance (ZZT) | 70 Ω @ 5 mA - determines regulation accuracy under varying load current |
| Reverse Leakage Current | 0.05 µA @ 19.2 V - ensures minimal standby current in battery-powered systems |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into handheld devices without external ESD protection |
| Capacitance | 80 pF @ 0 V, 1 MHz - impacts high-frequency noise filtering capability and signal integrity in RF-adjacent layouts |
| Temperature Coefficient | +18.4 mV/°C @ 5 mA - quantifies voltage drift per degree, critical for temperature-stable references |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish and UL 94 V-0 flammability rating. Cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Forward-biased terminal; connects to lower-potential node in regulation path |
| Pin 2 | No Connection | Internally unconnected; must remain floating-no PCB trace or pad required |
| Pin 3 | Cathode | Reverse-biased terminal; connects to regulated output or voltage rail being clamped |
Key Features
| Feature | Design Value |
|---|---|
| 250 mW Power Rating | Enables compact voltage regulation without heatsinking in low-power portable designs |
| Class 3 ESD Robustness | Eliminates need for discrete ESD diodes in consumer handsets and wearables |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for commercial and industrial shipments |
| Peak Pulse Power (225 W) | Withstands transient surges (8 × 20 µs) in I/O line protection without failure |
| Small SOT-23 Footprint | Supports ≥1000 components/in² density on high-layer-count mobile PCBs |
Applications
| Portable Power Management | USB Interface Protection |
|---|---|
Use Scenario: Regulating bias voltage for LDO feedback networks in Bluetooth earbuds. IC Role / Device Role / Timing Role: Zener reference providing stable 24 V-derived reference for error amplifier input. Use Value: Maintains ±1.5% output accuracy across −20 °C to +70 °C ambient, reducing calibration overhead. |
Use Scenario: Clamping D+ and D− lines against ESD events during USB 2.0 hot-plug. IC Role / Device Role / Timing Role: Transient voltage suppressor placed directly at connector entry point. Use Value: Limits voltage excursion to ≤25.6 V during 15 kV contact discharge, preserving PHY IC integrity. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module |
Use Scenario: Providing excitation voltage for 4–20 mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Precision shunt regulator stabilizing 24 V supply rail feeding analog front-end. Use Value: Delivers <0.5% long-term drift over 10-year field life due to low leakage and stable TC. |
Use Scenario: Overvoltage protection for LIN bus transceiver power input in door module ECUs. IC Role / Device Role / Timing Role: Clamp diode absorbing load-dump transients up to 35 V peak. Use Value: Survives 225 W pulse energy without parametric shift, meeting ISO 7637-2 Pulse 1/2a requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5267BLT1 | 24 V nominal, 500 mW rating, SOT-23, 100 Ω ZZT @ 20 mA | Higher power but higher impedance; less precise regulation at low currents | Prefer when surge energy absorption >225 W is required and tighter ZZT is not critical |
| BZX84-C24-7-F | 24 V nominal, 300 mW rating, SOT-23, 70 Ω ZZT @ 5 mA, AEC-Q101 qualified | Automotive-grade qualification; identical electrical specs but stricter PPAP documentation | Choose for automotive production where AEC-Q101 compliance and traceability are mandatory |
Compared with BZX84C24ET1G, MMBZ5267BLT1 offers higher surge tolerance but looser regulation, while BZX84-C24-7-F matches all key electrical parameters and adds automotive qualification-making it suitable for Tier 1 supply chains requiring PPAP evidence.
Availability
BZX84C24ET1G is available at Aetrix Electronics and suitable for portable power management, USB interface protection, and industrial sensor signal conditioning requiring stable component supply and full RoHS compliance.
Supply support for BZX84C24ET1G 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
onsemi is a global semiconductor supplier focused on energy-efficient innovation, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The BZX84C24ET1G belongs to onsemi's Zener voltage regulator product line, engineered specifically for space-constrained, low-power voltage reference and transient suppression in portable and high-density electronics.
FAQ
What is the exact Zener voltage tolerance for BZX84C24ET1G?
The BZX84C24ET1G has a guaranteed Zener voltage range of 22.8 V to 25.6 V at 5 mA test current (IZT), corresponding to a ±5% tolerance around the nominal 24 V value. This specification is validated per onsemi's Electrical Characteristics table on page 2 of the August 2024 Rev. 11 datasheet and applies under TA = 25 °C conditions.
Does BZX84C24ET1G have a functional third pin?
No, BZX84C24ET1G has only two active terminals: Pin 1 (Anode) and Pin 3 (Cathode). Pin 2 is explicitly designated "No Connection" in the mechanical outline (Style 8) and must remain unconnected on the PCB. This is confirmed in the marking diagram and pinout note on page 2 of the datasheet.
What is the maximum allowable junction temperature for BZX84C24ET1G?
The BZX84C24ET1G has a specified junction and storage temperature range of −65 °C to +150 °C. Operation beyond +150 °C risks permanent parametric shift or catastrophic failure. Derating begins at 25 °C ambient, with thermal resistance of 500 °C/W on FR-5 board limiting safe continuous power to 250 mW at TA = 25 °C.
Is BZX84C24ET1G suitable for automotive applications?
The standard BZX84C24ET1G is not AEC-Q101 qualified. However, the SZBZX84C24ET1G variant-identical in electrical specs but with automotive-specific process controls and PPAP capability-is qualified for automotive use. Engineers must select the SZ-prefix part for body control modules or infotainment systems requiring automotive certification.
How does the temperature coefficient affect BZX84C24ET1G in real circuits?
The BZX84C24ET1G exhibits a +18.4 mV/°C temperature coefficient at 5 mA, meaning its Zener voltage increases by ~18.4 mV per degree Celsius rise in junction temperature. In a 50 °C ambient-to-junction rise, this yields ~0.92 V total drift-critical for precision references but acceptable for general-purpose clamping where ±5% tolerance already accommodates variation.
BZX84C24ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±6%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
BZX84C24ET1G FAQ
1.How can I place an order for BZX84C24ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C24ET1G 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 BZX84C24ET1G reliable?
The price and inventory of BZX84C24ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C24ET1G is usually 5 days.
3.What payment methods are accepted for BZX84C24ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C24ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C24ET1G?
BZX84C24ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C24ET1G 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 BZX84C24ET1G?
For technical support, including BZX84C24ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C24ET1G requirements.
6.How does Aetrix verify that BZX84C24ET1G is sourced from the original manufacturer or authorized distributors?
All BZX84C24ET1G 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 BZX84C24ET1G meets industry standards.
7.What is the process for return or replacement of BZX84C24ET1G?
All BZX84C24ET1G units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C24ET1G, 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 BZX84C24ET1G part is unused and in its original packaging.
Return procedure for BZX84C24ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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