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onsemi BZX84C24LT3G
- Part No.:
- BZX84C24LT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C24LT3G.pdf
- Description:
- DIODE ZENER 24V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,979
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Product details
Overview
BZX84C24LT3G from onsemi is a 24 V ±5% Zener diode in SOT-23 package, rated for 250 mW power dissipation at 25°C, with 70 Ω dynamic impedance at 5 mA test current and 16.8 mV/°C temperature coefficient - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the BZX84C24LT3G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), thermal coefficient stability, low leakage (<50 nA @ 19.2 V), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to clamp voltage across load circuits. Its Zener mechanism provides stable regulation within ±5% tolerance at IZT = 5 mA, with minimal drift over −65°C to +150°C junction temperature range.
The SOT-23 package features anode (Pin 1), no connection (Pin 2), and cathode (Pin 3) - enabling unidirectional clamping with polarity band marking. ESD robustness exceeds 16 kV (HBM Class 3), supporting reliable operation in handheld and battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 24 V nominal, 22.8–25.6 V range at 5 mA - defines precise clamping threshold for 24 V rail protection |
| Power Dissipation | 250 mW on FR-5 board - supports continuous regulation without heatsinking in compact layouts |
| Zener Impedance | 70 Ω max at 5 mA - ensures low output impedance for stable reference under varying load current |
| Reverse Leakage | <50 nA at 19.2 V - minimizes standby power loss in always-on circuits |
| Temperature Coefficient | +16.8 mV/°C - enables predictable voltage shift across industrial temperature range |
| Capacitance | 80 pF at 0 V, 1 MHz - limits high-frequency noise coupling in signal-path references |
| ESD Rating | Class 3 (>16 kV HBM) - withstands handling and system-level electrostatic discharge events |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, Pb-free, void-free thermosetting plastic case with corrosion-resistant finish. Cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during regulation |
| 2 | No Connection | Internally isolated; no electrical function or PCB trace required |
| 3 | Cathode | Connected to higher-potential node; polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 250 mW Power Rating | Enables direct regulation of low-power logic supplies without external series resistor derating |
| ±5% Zener Tolerance | Meets industrial-grade accuracy requirements for non-critical voltage references |
| 16.8 mV/°C Tempco | Supports predictable compensation in temperature-sensitive analog front-ends |
| 80 pF Junction Capacitance | Minimizes signal distortion in RF detector or timing circuit applications |
| Class 3 ESD Robustness | Eliminates need for external ESD protection in consumer handheld designs |
Applications
| Power Rail Clamping | Reference Voltage Source |
|---|---|
|
Use Scenario: Protecting 24 V DC input to microcontroller I/O or sensor interface against transient surges. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing excess energy above 24 V threshold. Use Value: Prevents latch-up or damage to downstream ICs without adding active circuitry or layout area. |
Use Scenario: Providing stable bias voltage for op-amp comparators or ADC reference dividers. IC Role / Device Role / Timing Role: Passive voltage reference with known tempco and low dynamic impedance. Use Value: Enables <1% absolute accuracy over 0–70°C ambient when paired with matched resistors. |
| Overvoltage Protection | Signal-Level Limiting |
|
Use Scenario: Safeguarding USB-C PD negotiation lines or CAN transceiver VIO pins from ESD-induced overvoltage. IC Role / Device Role / Timing Role: Fast-acting clamp limiting voltage excursions to ≤25.6 V peak. Use Value: Complies with IEC 61000-4-2 Level 4 (15 kV air/8 kV contact) without additional TVS devices. |
Use Scenario: Constraining audio line-level signals to prevent ADC saturation in portable audio codecs. IC Role / Device Role / Timing Role: Low-capacitance limiter preserving signal integrity up to 1 MHz. Use Value: Delivers 80 pF capacitance and sub-50 nA leakage - avoids loading sensitive AC-coupled paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242BS-7-F | 24 V ±5%, 350 mW rating, SOT-23, 30 Ω ZZT @ 20 mA | Higher power handling but tighter thermal derating above 25°C | Preferred where sustained 20 mA Zener current is required without thermal runaway risk |
| BZX84-C24-TP | 24 V ±5%, 300 mW on alumina, 70 Ω ZZT @ 5 mA, same SOT-23 pinout | Optimized for ceramic substrate mounting; not FR-5 rated | Selected when using high-thermal-conductivity PCBs or hybrid modules |
Compared with BZX84C24LT3G, MMBZ5242BS-7-F offers lower dynamic impedance at higher currents but requires stricter thermal management, while BZX84-C24-TP delivers identical electrical specs with enhanced thermal performance on non-standard substrates - neither is pin-compatible drop-in replacement due to differing power derating profiles and substrate dependencies.
Availability
BZX84C24LT3G is available at Aetrix Electronics and suitable for cellular phone power management, handheld portable voltage supervision, and high-density PC board overvoltage protection requiring stable component supply and full RoHS compliance.
Supply support for BZX84C24LT3G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
The BZX84C24LT3G belongs to onsemi's standard-tolerance Zener diode family designed for cost-sensitive, space-constrained voltage regulation in portable and battery-powered electronics.
FAQ
What is the maximum Zener current the BZX84C24LT3G can handle continuously?
The BZX84C24LT3G is rated for 250 mW total power dissipation on FR-5 board at 25°C. At its nominal 24 V Zener voltage, this corresponds to a maximum continuous Zener current of approximately 10.4 mA (250 mW ÷ 24 V). Derating is required above 25°C per the 2.0 mW/°C slope in the datasheet. For reliable long-term operation, design targets should stay below 7–8 mA at room temperature.
Does the BZX84C24LT3G have a built-in capacitor or require external filtering?
The BZX84C24LT3G does not include any integrated capacitor; it is a discrete two-terminal Zener diode. Its junction capacitance is specified as 80 pF at 0 V bias and 1 MHz - a parasitic parameter, not a functional capacitor. External RC filtering may be added depending on application noise requirements, but the device itself provides no filtering capability beyond inherent junction behavior.
Is the BZX84C24LT3G suitable for automotive applications?
The BZX84C24LT3G is not AEC-Q101 qualified. For automotive use, onsemi offers the SZBZX84C24LT3G variant - identical electrical specs but with automotive-grade qualification, PPAP capability, and unique site/control change tracking. The standard BZX84C24LT3G is intended for commercial and industrial applications only.
How is the polarity marked on the BZX84C24LT3G SOT-23 package?
The BZX84C24LT3G uses a cathode band marking on the SOT-23 package body to indicate Pin 3 (cathode). Pin 1 is the anode, Pin 2 is internally unconnected. This matches Style 8 mechanical outline in onsemi's package documentation. The marking code "Y9" appears adjacent to the band, confirming the 24 V variant.
Can the BZX84C24LT3G replace a 24 V Zener in a linear regulator feedback loop?
Yes, the BZX84C24LT3G can serve as the upper leg of a resistive divider in adjustable linear regulator feedback networks (e.g., LM317), provided its 24 V nominal Zener voltage aligns with the target output and its 70 Ω dynamic impedance does not introduce unacceptable regulation error. Verify stability with the specific regulator's feedback impedance requirements and ensure current remains within 1–10 mA for optimal tempco performance.
BZX84C24LT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- BZX84CxxxLT1G
- 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:
- 250 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)
BZX84C24LT3G FAQ
1.How can I place an order for BZX84C24LT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C24LT3G 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 BZX84C24LT3G reliable?
The price and inventory of BZX84C24LT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C24LT3G is usually 5 days.
3.What payment methods are accepted for BZX84C24LT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C24LT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C24LT3G?
BZX84C24LT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C24LT3G 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 BZX84C24LT3G?
For technical support, including BZX84C24LT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C24LT3G requirements.
6.How does Aetrix verify that BZX84C24LT3G is sourced from the original manufacturer or authorized distributors?
All BZX84C24LT3G 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 BZX84C24LT3G meets industry standards.
7.What is the process for return or replacement of BZX84C24LT3G?
All BZX84C24LT3G units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C24LT3G, 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 BZX84C24LT3G part is unused and in its original packaging.
Return procedure for BZX84C24LT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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