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onsemi BZX84B24LT1G
- Part No.:
- BZX84B24LT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B24LT1G.pdf
- Description:
- DIODE ZENER 24V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:14,005
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Product details
Overview
BZX84B24LT1G from onsemi is a 24 V ±2.1% tight-tolerance Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board 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 clamping in portable power rails.
For engineers reviewing the BZX84B24LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±2.1%), thermal coefficient (16.8 mV/°C), leakage current (50 nA @ 19.2 V), junction capacitance (80 pF), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-bias mode, with nominal Zener voltage of 24 V measured at 5 mA test current (IZT) and guaranteed min/max bounds of 23.5 V to 24.5 V. Its 70 Ω Zener impedance (ZZT) at IZT ensures stable regulation under moderate load transients.
The BZX84B24LT1G features Class 3 ESD protection (>16 kV HBM), Pb-free RoHS-compliant construction, and a defined thermal resistance of 500 °C/W (junction-to-ambient on FR-5). Pin 2 is internally unconnected - confirmed by onsemi mechanical outline Style 8 and Electrical Characteristics tables.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V nominal, 23.5–24.5 V range at 5 mA - enables precise 24 V rail stabilization with ±2.1% tolerance |
| Power Dissipation | 250 mW on FR-5 board at 25°C - supports compact low-power regulation without heatsinking |
| Zener Impedance (ZZT) | 70 Ω max at 5 mA - maintains voltage stability during small-signal current variations |
| Reverse Leakage Current | 50 nA max at 19.2 V - ensures minimal quiescent current draw in standby circuits |
| Temperature Coefficient | +16.8 mV/°C - predictable positive drift allows accurate thermal compensation in reference designs |
| Junction Capacitance | 80 pF at 0 V, 1 MHz - limits high-frequency noise coupling in signal-path clamp applications |
| ESD Rating | Class 3 (>16 kV HBM) - withstands handling and board-level electrostatic discharge events |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish; cathode indicated by band; UL 94 V-0 flammability rating; maximum soldering temperature 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries forward current when used as rectifier |
| 2 | No Connection | Internally unconnected terminal - must remain floating; no PCB trace or pad required |
| 3 | Cathode | Connected to higher-potential node; defines Zener breakdown direction and polarity marking |
Key Features
| Feature | Design Value |
|---|---|
| Tight voltage tolerance | ±2.1% (23.5–24.5 V) at 5 mA - reduces need for post-regulation trimming in precision analog supplies |
| Low dynamic impedance | 70 Ω max - minimizes output voltage deviation under 1–10 mA load shifts |
| Controlled temperature coefficient | +16.8 mV/°C - enables predictable bias point tracking across −65°C to +150°C operating range |
| Pb-free & RoHS compliant | Meets global environmental directives without performance trade-offs or derating |
| High ESD robustness | Class 3 (>16 kV HBM) - eliminates need for external ESD protection in handheld interface circuits |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Negotiation Clamp |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 24 V industrial analog sensor front-ends exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Two-terminal Zener reference providing fixed 24 V bias to op-amp input stages and ADC reference dividers. Use Value: ±2.1% tolerance and +16.8 mV/°C TC enable <±1.5% total error over −40°C to +85°C without calibration. |
Use Scenario: Clamping CC line voltage during USB-C PD communication to prevent controller damage from transient overshoot. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as fast-acting overvoltage protector on 5 V CC signaling line. Use Value: 80 pF capacitance and 50 nA leakage preserve signal integrity while limiting CC voltage to ≤24.5 V during fault conditions. |
| Portable Medical Device Battery Monitor | Automotive Body Control Module (BCM) Reset Circuit |
|
Use Scenario: Providing regulated 24 V reference for fuel gauge ICs in battery-powered infusion pumps with Li-ion packs. IC Role / Device Role / Timing Role: Precision shunt regulator establishing stable threshold for battery voltage monitoring comparators. Use Value: 250 mW rating and SOT-23 footprint allow direct integration into space-constrained medical PCBs without thermal pads. |
Use Scenario: Generating clean reset signal for microcontrollers in 24 V automotive BCMs subjected to load dump transients. IC Role / Device Role / Timing Role: Zener-based voltage supervisor triggering MCU reset when supply drops below 23.5 V. Use Value: Guaranteed 23.5 V minimum Zener voltage ensures deterministic reset activation before brownout thresholds are violated. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C24LT1G | Standard tolerance (±5%): 22.8–25.6 V range vs. BZX84B24LT1G's ±2.1% (23.5–24.5 V) | Acceptable where 5% regulation accuracy suffices; higher ZZT (70 Ω vs. 70 Ω same, but looser VZ spread increases worst-case error) | Select BZX84C24LT1G only if cost sensitivity outweighs precision requirements; identical SOT-23 footprint and thermal specs. |
| SZBZX84B24LT1G | AEC-Q101 qualified, PPAP-capable, automotive-grade process control; otherwise identical electrical specs and packaging | Required for automotive body electronics, infotainment, or ADAS subsystems needing certified reliability | Choose SZBZX84B24LT1G for automotive OEM programs; BZX84B24LT1G is suitable for industrial and consumer applications. |
Compared with BZX84C24LT1G, the BZX84B24LT1G delivers tighter voltage control critical for analog references, while SZBZX84B24LT1G adds automotive qualification without altering regulation performance - enabling direct substitution where AEC-Q101 compliance is mandated.
Availability
BZX84B24LT1G is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB-C power negotiation clamping, and portable medical device battery monitoring requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84B24LT1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The BZX84BxxxLT1G series belongs to onsemi's precision Zener voltage regulator product line, engineered specifically for high-density, low-power applications demanding tight voltage tolerance, low leakage, and robust ESD performance in SOT-23 packaging.
FAQ
What is the Zener voltage tolerance of BZX84B24LT1G?
The BZX84B24LT1G has a Zener voltage tolerance of ±2.1%, specified as 23.5 V minimum to 24.5 V maximum at 5 mA test current (IZT). This tight tolerance is confirmed in the "BZX84BxxxL (Tight Tolerance Series)" table on page 4 of the onsemi datasheet, distinguishing it from the broader ±5% tolerance of the BZX84C24LT1G variant. The BZX84B24LT1G achieves this via tighter process control during manufacturing.
Is pin 2 of BZX84B24LT1G electrically connected?
No, pin 2 of the BZX84B24LT1G is internally unconnected (NC), as explicitly stated in the "Pinout: 1-Anode, 2-No Connection, 3-Cathode" header on pages 2 and 4 of the datasheet and confirmed by onsemi's mechanical outline Style 8. It must remain floating on the PCB - no trace, pad, or solder connection should be made to pin 2 to avoid unintended parasitic paths or assembly defects.
What is the maximum power dissipation of BZX84B24LT1G on FR-5 board?
The BZX84B24LT1G is rated for 250 mW total power dissipation on FR-5 board at 25°C ambient temperature, with a derating factor of 2.0 mW/°C above 25°C. This value is listed in the "MAXIMUM RATINGS" table on page 2 and applies directly to the BZX84B24LT1G as part of the BZX84BxxxLT1G series. Thermal resistance is 500 °C/W (junction-to-ambient).
Does BZX84B24LT1G meet automotive qualification standards?
The standard BZX84B24LT1G is not AEC-Q101 qualified; however, its automotive-grade counterpart SZBZX84B24LT1G is fully AEC-Q101 qualified and PPAP capable. Both share identical electrical specifications and SOT-23 packaging, but only the SZ-prefix version undergoes automotive-specific stress testing and process controls. For non-automotive industrial or consumer use, BZX84B24LT1G is appropriate.
What is the reverse leakage current specification for BZX84B24LT1G?
The BZX84B24LT1G has a maximum reverse leakage current (IR) of 50 nA at VR = 19.2 V, as specified in the "ELECTRICAL CHARACTERISTICS − BZX84BxxxL" table on page 4 of the datasheet. This low leakage ensures minimal current draw in high-impedance bias networks and preserves battery life in always-on portable applications where the BZX84B24LT1G serves as a reference or clamp.
BZX84B24LT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- BZX84BxxxLT1G
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±2%
- 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)
BZX84B24LT1G FAQ
1.How can I place an order for BZX84B24LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B24LT1G 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 BZX84B24LT1G reliable?
The price and inventory of BZX84B24LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B24LT1G is usually 5 days.
3.What payment methods are accepted for BZX84B24LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B24LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B24LT1G?
BZX84B24LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B24LT1G 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 BZX84B24LT1G?
For technical support, including BZX84B24LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B24LT1G requirements.
6.How does Aetrix verify that BZX84B24LT1G is sourced from the original manufacturer or authorized distributors?
All BZX84B24LT1G 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 BZX84B24LT1G meets industry standards.
7.What is the process for return or replacement of BZX84B24LT1G?
All BZX84B24LT1G units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B24LT1G, 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 BZX84B24LT1G part is unused and in its original packaging.
Return procedure for BZX84B24LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B24LT1G Tags
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