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Nexperia USA Inc. BZX84W-B24X
- Part No.:
- BZX84W-B24X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B24X.pdf
- Description:
- DIODE ZENER 24V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:9,680
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Product details
Overview
BZX84W-B24X from Nexperia is a ±2 % tolerance Zener voltage regulator diode rated for 24 V nominal breakdown voltage, 275 mW total power dissipation, and 200 mA maximum forward current in a SOT323 (SC-70) surface-mount package. It operates as a precision shunt reference in low-power voltage regulation and overvoltage protection circuits across consumer, industrial, and communication systems.
For engineers reviewing the BZX84W-B24X datasheet, BZX84W-B24X pinout, BZX84W-B24X application, or BZX84W-B24X equivalent, this page delivers verified Zener parameters including 24.0 V ±2 % working voltage, 250 Ω typical differential resistance at 5 mA, −20.4 mV/K temperature coefficient, 55 pF junction capacitance, and non-repetitive 40 W surge capability - all critical for stable biasing and transient clamping design.
Technical Context
This Zener diode functions as a two-terminal shunt regulator with reverse-biased operation, maintaining stable output voltage across load and line variations via controlled avalanche breakdown at 24 V. Its low 55 pF junction capacitance supports high-frequency decoupling and noise suppression up to ~100 MHz.
The device exhibits a negative temperature coefficient of −20.4 mV/K at IZ = 5 mA, enabling predictable thermal drift compensation in reference circuits. Thermal resistance from junction to ambient is 455 K/W on standard FR4 PCB, limiting continuous power handling to 275 mW at 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 24.0 V ±2 % at IZ = 5 mA - defines precise regulation point for feedback and reference circuits |
| Differential Resistance | 250 Ω max at IZ = 5 mA - determines output impedance and load regulation error under varying current |
| Temperature Coefficient | −20.4 mV/K at IZ = 5 mA - quantifies voltage drift per degree Celsius for thermal stability analysis |
| Junction Capacitance | 55 pF at f = 1 MHz, VR = 0 V - enables effective high-frequency bypass and RF filtering in signal paths |
| Non-repetitive Peak Power | 40 W at tp = 100 µs - supports transient overvoltage clamping without failure during ESD or surge events |
| Forward Voltage | 0.9 V max at IF = 10 mA - ensures low-loss conduction when used in series or dual-diode configurations |
| Reverse Current | 50 nA max at VR = 16.8 V - guarantees minimal leakage in high-impedance sensing and standby circuits |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; compact 2.2 mm × 1.35 mm footprint optimized for high-density PCB layouts and automated reflow assembly.
| 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 terminal; no internal bond wire or die connection - must remain unconnected in layout |
| 3 | Cathode (K) | Reverse-bias terminal tied to regulated output node; provides Zener breakdown path to ground or reference rail |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tight regulation accuracy without external trimming in precision analog references |
| 275 mW power rating on FR4 PCB | Supports continuous operation in space-constrained 3.3 V/5 V/12 V rail monitors without heatsinking |
| Low 55 pF junction capacitance | Minimizes signal distortion in RF detector and high-speed comparator reference applications |
| −20.4 mV/K temperature coefficient | Allows predictable thermal compensation when paired with positive-TC components in bandgap-like references |
| 40 W non-repetitive surge capability | Provides robust ESD immunity (IEC 61000-4-2 Level 4) without requiring additional TVS staging |
Applications
| Power Supply Rail Monitoring | ADC Reference Stabilization |
|---|---|
Use Scenario: Monitoring 24 V industrial control bus voltage for brownout detection and fault logging. IC Role / Device Role / Timing Role: Shunt regulator providing stable 24 V reference to comparator input for threshold comparison. Use Value: ±2 % tolerance ensures detection window remains within ±0.48 V, preventing false triggers in noisy factory environments. |
Use Scenario: Biasing the reference input of a 12-bit SAR ADC in a battery-powered sensor node. IC Role / Device Role / Timing Role: Low-capacitance Zener source delivering clean 24 V reference to ADC REF+ pin. Use Value: 55 pF capacitance avoids sampling-time settling delays, preserving full 12-bit ENOB performance at 1 MSPS. |
| Overvoltage Clamping | Signal-Level Translation |
Use Scenario: Protecting microcontroller GPIO pins from 24 V field-side transients in PLC I/O modules. IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing surge energy before it reaches sensitive CMOS inputs. Use Value: 40 W non-repetitive peak power rating handles 1 kV EFT bursts without degradation, extending system MTBF. |
Use Scenario: Level-shifting RS-485 receiver outputs from ±12 V differential to 0–24 V single-ended logic interface. IC Role / Device Role / Timing Role: Cathode-referenced Zener defining upper logic threshold in discrete comparator-based translator. Use Value: −20.4 mV/K TC enables consistent switching point across −40 °C to +85 °C operating range, eliminating calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C24 | ±5 % tolerance (22.8–25.6 V range), higher 70 Ω max differential resistance at 5 mA | Acceptable where cost sensitivity outweighs regulation accuracy; less suitable for precision feedback loops | Select for cost-driven industrial controls where ±5 % output tolerance is acceptable |
| MMSZ4700T1G | 24 V ±5 %, SOD-123 package, 500 mW Ptot, 100 Ω max rdif at 5 mA | Larger footprint and higher power rating; better for higher-current regulation but incompatible with ultra-dense layouts | Choose when board space allows larger package and >275 mW continuous dissipation is required |
Compared with BZX84W-B24X, BZX84W-C24 trades regulation accuracy for lower unit cost, while MMSZ4700T1G offers higher power handling in a less compact package - making BZX84W-B24X optimal for space-constrained, precision 24 V reference designs.
Availability
BZX84W-B24X is available at Aetrix Electronics and suitable for industrial automation, sensor signal conditioning, and embedded power monitoring requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for BZX84W-B24X 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 and industrial-grade components.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for stable voltage regulation and transient suppression in cost-sensitive, high-density SMT applications across consumer, industrial, and communications equipment.
FAQ
What is the maximum continuous reverse current for BZX84W-B24X at 24 V regulation?
The device is not rated for continuous reverse current at its Zener voltage; instead, it specifies a maximum reverse current of 50 nA at VR = 16.8 V (0.7 × VZnom). At 24 V, leakage remains below 100 nA per datasheet Table 7, ensuring minimal power loss in high-impedance reference nodes.
Can BZX84W-B24X be used in series for higher-voltage regulation?
No - the BZX84W-B24X has a dedicated not-connected (n.c.) pin (Pin 2), making it electrically a two-terminal device. Series connection requires three-terminal adjustable regulators or discrete Zener arrays; this part supports only parallel or standalone shunt use.
Is BZX84W-B24X qualified for automotive applications?
No - per Revision History Section 13, the BZX84W_SER series was changed to non-automotive qualification in Rev. 2 (2023). Automotive-grade alternatives require explicit "-Q" suffix parts from Nexperia's qualified portfolio, such as PZU24B2 or BZX84-Q series.
What is the recommended solder profile for SOT323 mounting?
Nexperia specifies reflow soldering using the footprint in Figure 9: 2.65 mm × 2.35 mm pad layout with 0.55 mm stencil aperture for each of the three terminals. Peak temperature must not exceed 260 °C for ≤10 seconds, per JEDEC J-STD-020 moisture sensitivity level 1 requirements.
BZX84W-B24X 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-B24X FAQ
1.How can I place an order for BZX84W-B24X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B24X 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-B24X reliable?
The price and inventory of BZX84W-B24X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B24X is usually 5 days.
3.What payment methods are accepted for BZX84W-B24X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B24X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B24X?
BZX84W-B24X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B24X 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-B24X?
For technical support, including BZX84W-B24X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B24X requirements.
6.How does Aetrix verify that BZX84W-B24X is sourced from the original manufacturer or authorized distributors?
All BZX84W-B24X 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-B24X meets industry standards.
7.What is the process for return or replacement of BZX84W-B24X?
All BZX84W-B24X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B24X, 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-B24X part is unused and in its original packaging.
Return procedure for BZX84W-B24X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B24X Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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