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Nexperia USA Inc. BZX84W-B24F
- Part No.:
- BZX84W-B24F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B24F.pdf
- Description:
- DIODE ZENER 24V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:7,376
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Product details
Overview
BZX84W-B24F from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 24 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and 250 Ω differential resistance at IZ = 5 mA - used for precision voltage reference and overvoltage protection in low-power analog signal conditioning circuits.
For engineers reviewing the BZX84W-B24F datasheet, BZX84W-B24F pinout, BZX84W-B24F application, or BZX84W-B24F equivalent, this page delivers verified Zener voltage, thermal resistance, reverse leakage, forward voltage, and package-specific soldering footprint data required for PCB layout, reliability margining, and replacement selection in industrial sensor interfaces and power rail supervision.
Technical Context
This device operates as a two-terminal shunt regulator with stable 24 V breakdown under reverse bias at IZ = 5 mA, exhibiting a positive temperature coefficient of +20.4 mV/K to minimize drift across −55 °C to +150 °C ambient range. Its 250 Ω dynamic impedance ensures predictable regulation error under load current variation.
The SOT323 package enables high-density placement on FR4 PCBs with single-sided copper, delivering 455 K/W junction-to-ambient thermal resistance and supporting peak non-repetitive surge power up to 40 W for transient suppression in compact DC/DC feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 23.5 V to 24.5 V at IZ = 5 mA - defines tight regulation window for 24 V rail monitoring |
| Differential Resistance (rdif) | 250 Ω max at IZ = 5 mA - determines output voltage deviation under ±1 mA load change |
| Reverse Leakage Current (IR) | 50 nA max at VR = 16.8 V - ensures minimal quiescent current in always-on bias networks |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - sets minimum headroom for series-connected LED or logic-level clamping |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on standard FR4 - limits continuous Zener current to 11.5 mA at 24 V |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports operation in extended-temperature industrial control enclosures |
| Capacitance (Cd) | 1.25 pF at f = 1 MHz, VR = 0 V - preserves signal integrity in >100 MHz RF detector or clock line clamp applications |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; 1.35 mm × 1.15 mm body, 0.65 mm pitch, and 0.25 mm maximum A1 height - optimized for reflow soldering with 2.65 mm × 2.35 mm land pattern per Figure 9.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or via allowed |
| 3 | Cathode (K) | Reverse-biased terminal; ties to regulated voltage node and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables direct replacement in 24 V reference designs without recalibration or resistor trimming |
| 250 Ω differential resistance | Reduces output voltage shift to ≤250 mV per 1 mA load current step in feedback divider networks |
| 1.25 pF junction capacitance | Minimizes phase perturbation in high-frequency oscillator biasing or RF envelope detection paths |
| 455 K/W thermal resistance | Allows full 275 mW power rating only with adequate copper pour; derates to 130 mW at 85 °C ambient |
| Non-repetitive 40 W surge capability | Clamps ESD transients up to ±8 kV contact discharge without degradation when used with 100 Ω series resistor |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 12-bit ADC inputs measuring 4–20 mA loop current in PLC analog input modules. IC Role / Device Role / Timing Role: Shunt Zener regulator providing 24 V reference to op-amp gain stage and ADC VREF pin. Use Value: ±2 % VZ tolerance ensures <0.5 LSB error across temperature; 250 Ω rdif maintains <10 ppm/°C drift in 100 µA reference current path. |
Use Scenario: Generating clean reset threshold for ARM Cortex-M0+ MCU operating from 3.3 V supply with brown-out detection. IC Role / Device Role / Timing Role: Reverse-biased Zener in RC delay network to set precise 2.4 V reset release voltage. Use Value: 50 nA IR at 16.8 V prevents capacitor leakage from delaying reset assertion; 0.9 V VF allows direct anode tie to GPIO for manual reset override. |
| DC/DC Converter Feedback Divider | ESD Protection for RS-485 Transceiver I/O |
|
Use Scenario: Setting output voltage of isolated flyback converter with TL431 secondary-side controller. IC Role / Device Role / Timing Role: Zener clamp across TL431 cathode to limit maximum feedback voltage during startup overshoot. Use Value: 40 W non-repetitive surge rating absorbs 100 ns switching spikes; 1.25 pF Cd avoids destabilizing 1 MHz optocoupler compensation loop. |
Use Scenario: Protecting half-duplex RS-485 transceiver bus pins against IEC 61000-4-2 Level 4 ESD events. IC Role / Device Role / Timing Role: Cathode-to-VCC, anode-to-GND configuration clamping common-mode surges on A/B lines. Use Value: 24 V VZ ensures clamping occurs above normal ±7 V bus swing but below 30 V transceiver absolute max rating; SOT323 footprint fits 0.8 mm trace spacing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5248BS | 24 V ±5 %, 200 mW Ptot, 300 Ω rdif, SOT-323 package | Higher tolerance and lower power limit reduce accuracy in precision references but suit cost-sensitive consumer power supplies | Select when budget constraints outweigh 2 % tolerance requirement and thermal margin is ≥20 °C below max ambient |
| Vishay BZX84-C24 | 24 V ±5 %, 300 mW Ptot, 250 Ω rdif, same SOT323 footprint | Higher power rating allows 12.5 mA continuous Zener current but lacks tight tolerance for metrology-grade references | Choose for higher-current regulation where ±5 % VZ is acceptable and board space permits identical layout reuse |
Compared with BZX84W-B24F, MMBZ5248BS trades 2 % tolerance and 275 mW rating for broader availability at lower unit cost, while BZX84-C24 retains identical dynamic impedance but relaxes voltage accuracy to accommodate wider production spread - both require recalculation of feedback dividers or reference buffers.
Availability
BZX84W-B24F is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller reset circuits, DC/DC feedback networks, and RS-485 ESD protection requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX84W-B24F 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with manufacturing rooted in process control and automotive-grade quality systems.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for stable voltage regulation in space-constrained industrial and consumer electronics where precision, thermal robustness, and SMT manufacturability are critical.
FAQ
What is the maximum continuous Zener current for BZX84W-B24F at 85 °C ambient?
At 85 °C ambient, the 275 mW total power dissipation derates to approximately 130 mW due to the 455 K/W thermal resistance. Dividing by 24 V yields a maximum continuous Zener current of 5.4 mA - exceeding the 5 mA test condition but requiring careful PCB copper area design to maintain junction temperature below 150 °C.
Can BZX84W-B24F replace BZX84-C24 in an existing design?
Yes, with qualification: both share SOT323 package, 24 V nominal Zener voltage, and 250 Ω differential resistance, but BZX84W-B24F's ±2 % tolerance improves regulation accuracy by 1.5× over BZX84-C24's ±5 %. Verify that reduced reverse leakage (50 nA vs. 100 nA) and tighter VZ do not affect startup timing or reference stability in your circuit.
Is pin 2 truly unused, or can it be grounded for EMI reduction?
Pin 2 is internally not connected per Table 2 and must remain floating - grounding it risks solder bridging, parasitic coupling, or mechanical stress on the die bond wire. The SOT323 outline drawing confirms no internal connection, and Nexperia explicitly prohibits routing traces to pin 2 in all application notes and footprint guidelines.
Does BZX84W-B24F meet automotive AEC-Q200 requirements?
No - the January 2023 datasheet revision explicitly states this part is non-automotive qualified. It lacks AEC-Q200 stress testing, automotive-grade lot traceability, and extended-temperature validation beyond −55 °C to +150 °C. For automotive use, select Nexperia's BZX84W-Q series variants, which carry separate AEC-Q200 certification.
BZX84W-B24F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±2%
- Power - Max:
- 275 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:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B24F FAQ
1.How can I place an order for BZX84W-B24F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B24F 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 BZX84W-B24F reliable?
The price and inventory of BZX84W-B24F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B24F is usually 5 days.
3.What payment methods are accepted for BZX84W-B24F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B24F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B24F?
BZX84W-B24F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B24F 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 BZX84W-B24F?
For technical support, including BZX84W-B24F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B24F requirements.
6.How does Aetrix verify that BZX84W-B24F is sourced from the original manufacturer or authorized distributors?
All BZX84W-B24F 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 BZX84W-B24F meets industry standards.
7.What is the process for return or replacement of BZX84W-B24F?
All BZX84W-B24F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B24F, 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 BZX84W-B24F part is unused and in its original packaging.
Return procedure for BZX84W-B24F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B24F Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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