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Nexperia USA Inc. BZX84W-B24-QX
- Part No.:
- BZX84W-B24-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B24-QX.pdf
- Description:
- DIODE ZENER 24V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,518
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Product details
Overview
BZX84W-B24-QX 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 qualified to AEC-Q101 for automotive use. It provides stable voltage reference in power supply feedback loops, overvoltage protection circuits, and precision biasing networks.
For engineers reviewing the BZX84W-B24-QX datasheet, BZX84W-B24-QX pinout, BZX84W-B24-QX application, or BZX84W-B24-QX equivalent, this page delivers verified Zener parameters, automotive-grade thermal and surge performance, SC-70 terminal mapping, and validated alternatives for 24 V regulation in space-constrained designs.
Technical Context
This device operates as a two-terminal shunt regulator with reverse-biased breakdown behavior, exhibiting 23.5–24.5 V nominal Zener voltage at IZ = 5 mA and temperature coefficient of +20.4 mV/K. Its differential resistance is ≤250 Ω at 5 mA, enabling tight regulation under dynamic load conditions.
Designed for high-reliability automotive environments, it supports ambient temperatures from −55 °C to +150 °C, junction temperature up to 150 °C, and non-repetitive peak reverse power dissipation of 40 W for 100 µs pulses - critical for transient suppression in 12 V/24 V vehicle systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 23.5–24.5 V at IZ = 5 mA; ensures precise 24 V reference within ±2% tolerance for feedback and sensing circuits. |
| Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; defines continuous thermal budget in compact SMT layouts. |
| Differential Resistance (rdiff) | ≤250 Ω at IZ = 5 mA; limits output voltage variation under changing load current. |
| Temperature Coefficient (SZ) | +20.4 mV/K at IZ = 5 mA; quantifies Zener voltage drift per degree Celsius rise in junction temperature. |
| Reverse Current (IR) | ≤55 nA at VR = 16.8 V (0.7 × VZnom); guarantees low leakage in standby and low-power modes. |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA; enables predictable anode-cathode drop during forward conduction testing or clamping. |
| Junction-to-Ambient Rth | 455 K/W in free air on FR4; determines thermal rise per watt and informs derating curves for elevated ambient operation. |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package with 3 leads; leadless construction optimized for high-density PCB assembly and reflow/wave soldering per Figures 9–10 in the datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential node in Zener regulation configuration. |
| 2 | Not Connected (n.c.) | Electrically isolated internal pad; no circuit function - must remain unconnected on PCB layout. |
| 3 | Cathode (K) | Reverse-bias terminal; connected to higher-potential node and serves as regulated output reference point. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, temperature cycling, and ESD robustness - suitable for under-hood and ADAS power rails. |
| ±2% Zener voltage tolerance | Enables tighter closed-loop control in voltage references without post-production trimming or calibration. |
| 275 mW power rating on standard FR4 | Supports sustained regulation in 24 V auxiliary supplies without heatsinking in consumer and industrial SMPS designs. |
| Low 55 nA leakage at 70% VZ | Minimizes quiescent current in battery-backed circuits and improves efficiency in always-on monitoring nodes. |
| 40 W non-repetitive surge capability | Withstands ISO 7637-2 pulse 1/2a transients in 24 V vehicle systems without degradation. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Regulating reference voltage for microcontroller ADC and CAN transceiver bias in BCM power domain. IC Role / Device Role / Timing Role: Shunt Zener reference providing stable 24 V rail monitoring and feedback for buck converter ICs. Use Value: Maintains <±0.5% reference accuracy across −40 °C to +125 °C ambient, meeting ASIL-B functional safety margin requirements. |
Use Scenario: Clamping input overvoltage on 4–20 mA current loop receiver front-end. IC Role / Device Role / Timing Role: Reverse-biased transient suppressor limiting analog input to safe levels during field wiring faults. Use Value: Limits fault voltage to ≤26 V with <100 ns response, preventing damage to precision op-amps and ADC drivers. |
| Medical Infusion Pump Power Supervision | Telecom DC-DC Converter Feedback |
Use Scenario: Monitoring main 24 V DC supply integrity before enabling motor drivers and sensors. IC Role / Device Role / Timing Role: Zener-based undervoltage lockout (UVLO) threshold detector feeding comparator input. Use Value: Provides repeatable 23.5 V turn-off threshold with <0.1 V hysteresis via external resistor divider, ensuring fail-safe shutdown. |
Use Scenario: Setting output voltage of isolated flyback controller via optocoupler feedback network. IC Role / Device Role / Timing Role: Precision Zener reference establishing 24 V output setpoint in secondary-side regulation. Use Value: Delivers ±0.48 V regulation accuracy over line/load/temperature, reducing need for post-assembly trim. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C24-Q | ±5% tolerance (22.8–25.6 V), higher max leakage (100 nA), identical SOT323 package and thermal specs. | Acceptable where cost sensitivity outweighs precision; not recommended for closed-loop feedback requiring tight VZ stability. | Select when design tolerates wider regulation band and prioritizes lowest unit cost in high-volume production. |
| MMSZ4686T1G | ±5% tolerance (22.8–25.6 V), 500 mW Ptot, SOD-123 package (larger footprint), higher thermal resistance (350 K/W). | Offers higher power handling but requires more board area; lacks AEC-Q101 qualification. | Choose only for non-automotive industrial applications needing >275 mW dissipation and where SOD-123 layout is acceptable. |
Compared with BZX84W-B24-QX, the BZX84-C24-Q trades precision for cost in identical automotive-qualified packaging, while MMSZ4686T1G sacrifices qualification and size efficiency for higher power - making the BZX84W-B24-QX optimal for space-constrained, safety-critical 24 V regulation.
Availability
BZX84W-B24-QX is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor signal conditioning, medical power supervision, and telecom DC-DC feedback requiring stable component supply with AEC-Q101 compliance and traceable sourcing.
Supply support for BZX84W-B24-QX 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 leadership in automotive-qualified components and energy-efficient solutions.
The BZX84W-Q series belongs to Nexperia's automotive Zener portfolio, engineered specifically for robust voltage reference and transient suppression in 12 V/24 V vehicle electrical systems and industrial control environments.
FAQ
What is the maximum continuous reverse current the BZX84W-B24-QX can sustain at 25 °C?
The device has no specified maximum continuous reverse current; its operation is defined by power dissipation limit. At 25 °C ambient, with 275 mW Ptot and 24 V VZ, the maximum sustainable Zener current is approximately 11.5 mA (275 mW ÷ 24 V), assuming negligible forward drop and ideal thermal conditions on FR4 PCB.
Can BZX84W-B24-QX replace BZX84-C24-Q in an existing design?
Yes, mechanically and electrically - both use SOT323 package and share identical pinning, thermal characteristics, and surge ratings. However, BZX84W-B24-QX offers ±2% tolerance versus ±5%, improving regulation accuracy by up to 3% absolute voltage error in feedback paths without layout changes.
Is the n.c. pin (Pin 2) required to be grounded or left floating in PCB layout?
Pin 2 is internally not connected and must remain unconnected on the PCB - neither grounded nor tied to any net. Routing traces or copper pours to this pad may cause unintended parasitic coupling or solder bridging; the datasheet explicitly defines it as "not connected" with no electrical function.
Does BZX84W-B24-QX support wave soldering, and what footprint is recommended?
Yes, it is qualified for wave soldering using the footprint in Figure 10 of the datasheet: 3.65 mm × 2.1 mm overall, with 1.425 mm × 0.55 mm solder lands (3×), 4.6 mm transport direction length, and 2.575 mm × 1.8 mm occupied solder resist area - optimized to prevent tombstoning and ensure joint integrity.
BZX84W-B24-QX 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-QX FAQ
1.How can I place an order for BZX84W-B24-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B24-QX 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-QX reliable?
The price and inventory of BZX84W-B24-QX 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-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B24-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B24-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B24-QX?
BZX84W-B24-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B24-QX 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-QX?
For technical support, including BZX84W-B24-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B24-QX requirements.
6.How does Aetrix verify that BZX84W-B24-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-B24-QX 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-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B24-QX?
All BZX84W-B24-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B24-QX, 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-QX part is unused and in its original packaging.
Return procedure for BZX84W-B24-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B24-QX Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAZ12-13-F
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