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Nexperia USA Inc. BZX384-B24-QX
- Part No.:
- BZX384-B24-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B24-QX.pdf
- Description:
- DIODE ZENER 24V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,964
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Product details
Overview
BZX384-B24-Q from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 24 V nominal breakdown voltage at 5 mA, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive power rail stabilization and overvoltage protection.
For engineers reviewing the BZX384-B24-Q datasheet, BZX384-B24-Q pinout, BZX384-B24-Q application, or BZX384-B24-Q equivalent, this part serves as a precision low-power shunt regulator in ECU voltage reference circuits, sensor bias networks, and microcontroller reset supervision where stable 24 V clamping with <±2 % tolerance and 16.8 mV/K temperature coefficient is required.
Technical Context
This Zener diode operates in reverse-biased breakdown mode with a specified 24 V working voltage at IZ = 5 mA, differential resistance of 250 Ω max, and reverse current ≤0.05 μA at VR = 19.2 V. Its thermal resistance from junction to ambient is 415 K/W on FR4 PCB.
Designed for automotive-grade reliability, it supports non-repetitive peak reverse power dissipation up to 40 W (100 μs pulse), junction temperature range from −65 °C to +150 °C, and meets AEC-Q101 stress test requirements for discrete semiconductors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 23.5 V to 24.5 V at IZ = 5 mA - ensures precise 24 V regulation within ±2 % tolerance for stable reference generation |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - defines continuous DC power handling on standard FR4 PCB with single-sided copper |
| Differential Resistance | ≤250 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity in shunt configuration |
| Reverse Current | ≤0.05 μA at VR = 19.2 V - guarantees minimal leakage below breakdown, critical for low-power standby circuits |
| Temperature Coefficient | +16.8 mV/K at IZ = 5 mA - quantifies voltage drift per degree Celsius, enabling thermal error budgeting in automotive environments |
| Non-repetitive Peak Power | 40 W for 100 μs - supports transient surge suppression without failure in 12/24 V vehicle electrical systems |
| Junction Temperature | −65 °C to +150 °C - validates operation across full automotive under-hood temperature range |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package with 2 leads; cathode marked by bar on top surface; footprint compliant with JEDEC MO-203-AB standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-bias anode-to-cathode voltage establishes Zener conduction |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes current path during regulation or surge events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and ESD testing per JESD22 standards |
| ±2 % voltage tolerance | Enables tighter system-level voltage margin control vs. ±5 % variants, reducing need for post-regulation trimming |
| Low thermal resistance (110 K/W to solder point) | Improves heat transfer to PCB copper, sustaining higher pulsed power without exceeding Tj limit |
| 24 V nominal Zener voltage | Matches common 24 V industrial and commercial power rails for direct overvoltage clamping without external resistors |
| Small SOD323 footprint | Reduces board area by >50 % vs. DO-35, supporting high-density automotive ECUs and ADAS modules |
Applications
| Automotive ECU Power Supervision | Industrial Sensor Biasing |
|---|---|
|
Use Scenario: Monitoring 24 V battery rail in engine control unit to trigger brownout reset when voltage drops below 22 V. IC Role / Device Role / Timing Role: Shunt regulator providing stable reference for comparator input in reset supervisor IC. Use Value: ±2 % tolerance ensures reset threshold accuracy within 0.48 V, preventing false resets during cranking transients. |
Use Scenario: Supplying precise bias current to a 4–20 mA current-loop pressure sensor in factory automation. IC Role / Device Role / Timing Role: Voltage reference element setting compliance voltage for loop transmitter op-amp. Use Value: 250 Ω max differential resistance minimizes output impedance variation across temperature, maintaining loop linearity. |
| Microcontroller Reset Circuit | Transient Voltage Clamping |
|
Use Scenario: Generating clean 24 V reset signal for ARM-based telematics module during cold start. IC Role / Device Role / Timing Role: Zener clamp stabilizing RC time constant in power-on reset generator. Use Value: 16.8 mV/K temperature coefficient allows predictable timing shift across −40 °C to +125 °C operating range. |
Use Scenario: Protecting CAN transceiver inputs from load-dump spikes in 24 V truck electronics. IC Role / Device Role / Timing Role: Fast-acting shunt limiter absorbing 40 W surges for 100 μs without degradation. Use Value: 40 W non-repetitive peak power rating exceeds ISO 7637-2 Pulse 5a requirement (35 W typical). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B24 | Same electrical specs but lacks AEC-Q101 qualification and automotive-grade traceability | Restricted to commercial-grade industrial controls; not approved for automotive production | Select only for cost-sensitive non-automotive designs where qualification documentation is unnecessary |
| MMSZ5248B-TP | 24 V ±5 % tolerance, 500 mW Ptot, SOD-123 package, no AEC-Q101 certification | Higher power but looser tolerance; larger footprint increases board space and thermal mass | Choose when higher continuous power is needed and ±5 % regulation error is acceptable |
Compared with BZX384-B24-Q, the BZX384-B24 omits automotive qualification while matching all electrical parameters, whereas MMSZ5248B-TP trades tighter tolerance and smaller size for higher power and non-automotive status-making BZX384-B24-Q optimal for space-constrained, safety-critical 24 V automotive regulation.
Availability
BZX384-B24-Q is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and microcontroller reset supervision requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for BZX384-B24-Q 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 logic, analog, and discrete components with emphasis on automotive and industrial reliability.
The BZX384-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for precision voltage regulation and transient protection in harsh-environment 12 V and 24 V vehicle systems.
FAQ
What is the maximum continuous forward current for BZX384-B24-Q?
The device is not intended for continuous forward conduction; its absolute maximum forward current is 250 mA per limiting values table, but forward operation is limited to brief pulses (tp ≤ 100 μs) during testing. In normal Zener regulation use, forward bias is avoided entirely.
Can BZX384-B24-Q replace BZX384-C24-Q in a design?
No-BZX384-C24-Q has ±5 % tolerance (22.8 V to 25.6 V), while BZX384-B24-Q is ±2 % (23.5 V to 24.5 V). Substituting introduces up to 1.1 V additional regulation uncertainty, potentially violating system voltage margin requirements in automotive applications.
What is the thermal resistance from junction to solder point, and why does it matter?
Rth(j-sp) is 110 K/W, measured from junction to cathode solder point. This value directly impacts surge survivability: lower Rth enables faster heat extraction during 40 W transients, preventing thermal runaway and extending device lifetime in high-reliability automotive deployments.
Is the marking code 'M7' unique to BZX384-B24-Q?
Yes-per Table 4, 'M7' is the exclusive top-side marking for BZX384-B24-Q across the entire BZX384-Q series, enabling unambiguous visual identification on assembled PCBs and simplifying automated optical inspection in high-volume manufacturing.
BZX384-B24-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-B24-QX FAQ
1.How can I place an order for BZX384-B24-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-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 BZX384-B24-QX reliable?
The price and inventory of BZX384-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 BZX384-B24-QX is usually 5 days.
3.What payment methods are accepted for BZX384-B24-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B24-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B24-QX?
BZX384-B24-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-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 BZX384-B24-QX?
For technical support, including BZX384-B24-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B24-QX requirements.
6.How does Aetrix verify that BZX384-B24-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-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 BZX384-B24-QX meets industry standards.
7.What is the process for return or replacement of BZX384-B24-QX?
All BZX384-B24-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-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 BZX384-B24-QX part is unused and in its original packaging.
Return procedure for BZX384-B24-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B24-QX Tags
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