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Nexperia USA Inc. BZX84W-B24-QF
- Part No.:
- BZX84W-B24-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B24-QF.pdf
- Description:
- DIODE ZENER 24V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,692
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Product details
Overview
BZX84W-B24-QF from Nexperia is a ±2 % tolerance Zener voltage regulator diode with 24 V nominal breakdown voltage, 250 Ω differential resistance at 5 mA, and 20.4 mV/K temperature coefficient, housed in SOT323 (SC-70) package for precision voltage reference in automotive power supply rails.
For engineers reviewing the BZX84W-B24-QF datasheet, BZX84W-B24-QF pinout, BZX84W-B24-QF application, or BZX84W-B24-QF equivalent, this device supports stable 24 V regulation under transient load conditions, meets AEC-Q101 qualification, and operates across −55 °C to +150 °C ambient range.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable 24 V reference across its cathode-anode terminals, with low dynamic impedance (250 Ω at IZ = 5 mA) ensuring minimal output voltage deviation under varying current loads.
Its temperature coefficient of +20.4 mV/K indicates positive drift with junction temperature rise, requiring thermal compensation in high-precision analog circuits; it is rated for 275 mW total power dissipation on FR4 PCB with single-sided copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 24 V nominal (±2 % tolerance), defines precise regulation point for 24 V rail stabilization |
| Differential Resistance rdif | 250 Ω at IZ = 5 mA, limits output voltage variation to ~1.25 V per 5 mA current change |
| Temperature Coefficient SZ | +20.4 mV/K, causes ~500 mV shift over 25 °C to 125 °C junction range |
| Total Power Dissipation Ptot | 275 mW at Tamb = 25 °C on standard FR4 PCB, sets max continuous Zener current to ~11.5 mA |
| Reverse Current IR | 50 nA at VR = 16.8 V (0.7 × VZnom), ensures low leakage in standby mode |
| Junction Temperature Tj | 150 °C maximum, enables operation in under-hood automotive environments |
| Package | SOT323 (SC-70), 3-terminal leadless surface-mount package with 1.3 mm × 1.8 mm footprint |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package with 1.3 mm × 1.8 mm body, 0.65 mm pitch, and tin-plated terminations compatible with reflow and wave soldering per IPC-7095.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-bias terminal; connects to lower-potential node in regulation circuit |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling |
| 3 | Cathode (K) | Reverse-bias terminal; connects to regulated output node and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| ±2 % Zener voltage tolerance | Enables tighter regulation than ±5 % variants, reducing need for post-regulation trimming |
| Low capacitance (1.25 pF) | Minimizes high-frequency signal coupling in RF bias networks and fast-switching supplies |
| Non-repetitive peak reverse power: 40 W | Withstands 100 µs transients up to 40 W, supporting surge protection in 24 V CAN bus interfaces |
| Thermal resistance Rth(j-a) | 455 K/W on FR4 PCB, enabling thermal design margin calculation for sustained 275 mW operation |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial PLC Analog Input Protection |
|---|---|
|
Use Scenario: Providing stable 24 V reference for ADC biasing and sensor excitation in under-hood ECU modules. IC Role / Device Role / Timing Role: Zener voltage reference diode maintaining regulation during battery voltage fluctuations (9–16 V) and load dump events. Use Value: ±2 % tolerance and AEC-Q101 qualification ensure consistent sensor measurement accuracy across −40 °C to +125 °C operating range. |
Use Scenario: Clamping input transients on 24 V analog input channels of programmable logic controllers. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as overvoltage protector for precision op-amp front-ends. Use Value: 40 W non-repetitive peak power rating absorbs 100 µs surges without degradation, preserving signal chain integrity. |
| Telecom Power Supply Feedback | Medical Infusion Pump Voltage Monitor |
|
Use Scenario: Setting feedback threshold in isolated 24 V DC-DC converter secondary-side regulation loop. IC Role / Device Role / Timing Role: Precision Zener defining error amplifier reference point for optocoupler-coupled feedback path. Use Value: 250 Ω differential resistance minimizes regulation error caused by photocurrent variation across temperature. |
Use Scenario: Monitoring 24 V auxiliary supply voltage in battery-powered infusion pumps with safety-critical shutdown logic. IC Role / Device Role / Timing Role: Low-leakage (50 nA) Zener providing fail-safe undervoltage detection threshold. Use Value: 150 °C max junction temperature supports long-term reliability in sealed, thermally constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C24-Q | ±5 % tolerance (22.8–25.6 V range) vs. ±2 % (23.5–24.5 V); identical package and thermal specs | Acceptable where 24 V regulation tolerance > ±2 % is permitted, e.g., non-critical biasing | Select for cost-sensitive designs where tighter voltage control is unnecessary |
| MMSZ5245B-TP | 24 V ±5 %, SOD-123 package, 500 mW Ptot, higher 350 Ω rdif at 20 mA | Higher power handling but larger footprint and looser regulation; suited for general-purpose PCB space | Choose when board area allows SOD-123 and 500 mW dissipation is required |
Compared with BZX84W-C24-Q, the BZX84W-B24-QF offers tighter voltage control critical for precision references; versus MMSZ5245B-TP, it delivers superior thermal density and smaller footprint for space-constrained automotive modules.
Availability
BZX84W-B24-QF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC analog inputs, and telecom DC-DC converter feedback loops requiring stable component supply with AEC-Q101 compliance.
Supply support for BZX84W-B24-QF 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices.
The BZX84W-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for stable voltage reference and overvoltage protection in harsh-environment automotive and industrial systems.
FAQ
What is the maximum continuous Zener current for BZX84W-B24-QF at 85 °C ambient?
At Tamb = 85 °C, derated power dissipation is 185 mW (based on 455 K/W thermal resistance and 150 °C max Tj). With VZ = 24 V, maximum continuous Zener current is 7.7 mA - sufficient for reference biasing but not high-current shunt regulation.
Can BZX84W-B24-QF replace BZX84W-B24-Q in existing designs?
Yes - BZX84W-B24-QF is a direct replacement for BZX84W-B24-Q, sharing identical electrical specifications, SOT323 package dimensions, pinout, and AEC-Q101 qualification; the "QF" suffix denotes enhanced traceability and packaging per Nexperia's latest manufacturing release.
How does the 2-pin configuration (Pin 2 n.c.) affect PCB layout?
Pin 2 is internally unconnected and must remain unstubbed on the PCB; routing traces or placing solder mask openings over it introduces parasitic capacitance and risk of contamination-induced leakage, degrading reverse-bias stability and long-term reliability.
Is BZX84W-B24-QF suitable for use in CAN FD physical layer biasing?
Yes - its 1.25 pF capacitance at 1 MHz and 24 V Zener voltage make it appropriate for biasing common-mode chokes in 24 V CAN FD transceivers; combined with 40 W surge capability, it withstands ISO 11898-2 transient requirements when paired with appropriate series impedance.
BZX84W-B24-QF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W-Q
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±2.08%
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B24-QF FAQ
1.How can I place an order for BZX84W-B24-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B24-QF 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-B24-QF reliable?
The price and inventory of BZX84W-B24-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B24-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B24-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B24-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B24-QF?
BZX84W-B24-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B24-QF 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-B24-QF?
For technical support, including BZX84W-B24-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B24-QF requirements.
6.How does Aetrix verify that BZX84W-B24-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B24-QF 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-B24-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B24-QF?
All BZX84W-B24-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B24-QF, 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-B24-QF part is unused and in its original packaging.
Return procedure for BZX84W-B24-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B24-QF Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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MM5Z5V1ST1G
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