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Nexperia USA Inc. BZX384-A24-QX
- Part No.:
- BZX384-A24-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A24-QX.pdf
- Description:
- DIODE ZENER 24V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,638
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Product details
Overview
BZX384-A24-Q from Nexperia is a ±1 % 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 voltage reference and overvoltage protection circuits.
For engineers reviewing the BZX384-A24-Q datasheet, BZX384-A24-Q pinout, BZX384-A24-Q application, or BZX384-A24-Q equivalent, this device serves as a precision low-power shunt regulator in ECU power rails, sensor biasing networks, and ADC reference stabilization where tight voltage tolerance and automotive-grade reliability are required.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable DC voltage across its terminals under varying load and input conditions. Its 24 V nominal Zener voltage is specified at IZ = 5 mA with ±1 % tolerance, and differential resistance is ≤250 Ω at that current.
It features non-repetitive peak reverse power dissipation of 40 W (100 μs pulse), junction-to-ambient thermal resistance of 415 K/W on FR4 PCB, and temperature coefficient of +16.8 mV/K - indicating positive drift with rising temperature, critical for thermal design in engine bay applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 23.76 V to 24.24 V at IZ = 5 mA - defines precise regulation point for feedback or clamping |
| Tolerance | ±1 % - enables high-accuracy voltage references without external trimming |
| Power Dissipation Ptot | 300 mW at Tamb ≤ 25 °C - limits continuous operating current to ~12.5 mA at 24 V |
| Differential Resistance rdif | ≤250 Ω at IZ = 5 mA - determines output impedance and load regulation error |
| Reverse Current IR | ≤0.05 μA at VR = 19.2 V - ensures minimal leakage in standby or low-power modes |
| Temperature Coefficient SZ | +16.8 mV/K - quantifies voltage drift per degree Celsius rise in junction temperature |
| Package | SOD323 (SC-76) - 2-pin surface-mount footprint compatible with automated assembly and space-constrained PCBs |
Pinout & Package
SOD323 (SC-76) plastic surface-mounted package with cathode-marked end (bar marking), 2.3 mm × 1.35 mm body, 0.45 mm nominal height, and tin-plated leads suitable for reflow and wave soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock |
| ±1 % Zener tolerance | Enables direct replacement of higher-cost precision references in cost-sensitive ECUs and sensors |
| 40 W non-repetitive surge rating | Withstands transient overvoltage events such as load dump (ISO 7637-2 Pulse 5a) without failure |
| Low thermal resistance (110 K/W to solder point) | Improves power handling in thermally constrained layouts by reducing junction temperature rise |
| Marking code "4N" | Enables visual identification on assembled PCBs and supports automated optical inspection (AOI) |
Applications
| Automotive Engine Control Unit (ECU) Power Rail Clamping | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protects 24 V supply inputs in diesel ECU modules against ISO 7637-2 transients and alternator load dump spikes. IC Role / Device Role / Timing Role: Shunt regulator providing low-impedance clamp path to ground when input exceeds 24.24 V. Use Value: Prevents damage to downstream LDOs and microcontrollers by limiting peak rail voltage to within safe operating area. |
Use Scenario: Stabilizes excitation voltage for strain-gauge bridges in industrial pressure transmitters. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric analog signal chains. Use Value: Maintains bridge output accuracy within ±0.1 % full-scale error over -40 °C to +125 °C ambient range. |
| Automotive Cabin Temperature Sensor Biasing | Medical Infusion Pump Voltage Monitoring |
Use Scenario: Supplies stable 24 V bias to NTC thermistor networks in HVAC control modules. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source ensuring consistent resistance-to-temperature conversion. Use Value: Reduces thermal measurement uncertainty to ±0.3 °C across full automotive temperature range. |
Use Scenario: Monitors battery voltage level in portable infusion pumps to trigger low-battery alerts before cutoff. IC Role / Device Role / Timing Role: Overvoltage/undervoltage detection element in discrete comparator-based monitoring circuit. Use Value: Enables accurate 24 V threshold detection with <10 mV hysteresis using standard op-amp comparators. |
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-Q | ±2 % tolerance (23.5 V–24.5 V), higher max differential resistance (≤300 Ω) | Acceptable for non-critical biasing where ±2 % regulation suffices | Select when cost reduction outweighs need for ±1 % accuracy |
| MMSZ5248B-TP | ±5 % tolerance (22.8 V–25.2 V), same SOD-123 package, 500 mW rating | Higher power handling but looser tolerance; not AEC-Q101 qualified | Use only in non-automotive industrial designs requiring higher continuous dissipation |
Compared with BZX384-B24-Q and MMSZ5248B-TP, the BZX384-A24-Q delivers tighter voltage control and automotive qualification at the expense of slightly lower surge margin than the 500 mW MMSZ part - making it optimal for safety-critical, space-constrained automotive voltage references.
Availability
BZX384-A24-Q is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and medical device power monitoring requiring stable component supply, traceable lot history, and long-term lifecycle support.
Supply support for BZX384-A24-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 high-volume, high-reliability logic, discrete, and MOSFET solutions, with leadership in automotive-qualified components.
The BZX384-Q series belongs to Nexperia's automotive-grade Zener diode product line, engineered specifically for robust voltage regulation in harsh environments including engine control, body electronics, and ADAS subsystems.
FAQ
What is the maximum continuous forward current for BZX384-A24-Q?
The device is not intended for forward conduction; its absolute maximum forward current is 250 mA per limiting values table, but typical operation uses reverse bias only. Forward voltage is 0.9 V at 10 mA - sufficient for indicator LED drive in low-current diagnostic circuits, though not its primary function.
Can BZX384-A24-Q replace BZX384-C24-Q in an existing design?
Yes, but with trade-offs: BZX384-A24-Q offers ±1 % tolerance versus ±5 % for the C version, improving regulation accuracy but requiring verification of thermal margin since both share identical 300 mW Ptot. No layout or soldering changes are needed due to identical SOD323 package and pinout.
How does the +16.8 mV/K temperature coefficient affect circuit performance?
This positive coefficient means the Zener voltage increases by ~16.8 mV per °C rise in junction temperature. In a 125 °C under-hood environment, VZ rises by ~1.7 V above room-temperature value - requiring derating or compensation in high-precision references, but acceptable for clamping where absolute accuracy is secondary to robustness.
Is BZX384-A24-Q suitable for use in DC-DC converter feedback networks?
Yes - its low differential resistance (≤250 Ω) and tight tolerance make it viable for secondary-side voltage sensing in isolated flyback or forward converters, particularly where optocoupler feedback is omitted. However, dedicated TL431-based references offer better stability and lower tempco for high-accuracy designs.
BZX384-A24-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:
- ±1%
- 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-A24-QX FAQ
1.How can I place an order for BZX384-A24-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A24-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-A24-QX reliable?
The price and inventory of BZX384-A24-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-A24-QX is usually 5 days.
3.What payment methods are accepted for BZX384-A24-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A24-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A24-QX?
BZX384-A24-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A24-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-A24-QX?
For technical support, including BZX384-A24-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A24-QX requirements.
6.How does Aetrix verify that BZX384-A24-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-A24-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-A24-QX meets industry standards.
7.What is the process for return or replacement of BZX384-A24-QX?
All BZX384-A24-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A24-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-A24-QX part is unused and in its original packaging.
Return procedure for BZX384-A24-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-A24-QX Tags
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