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Nexperia USA Inc. BZX384-A20-QX
- Part No.:
- BZX384-A20-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A20-QX.pdf
- Description:
- DIODE ZENER 20V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,503
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Product details
Overview
BZX384-A20-Q from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 20 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-A20-Q datasheet, BZX384-A20-Q pinout, BZX384-A20-Q application, or BZX384-A20-Q equivalent, key selection criteria include its tight ±1 % VZ tolerance, low 225 Ω differential resistance at IZ = 5 mA, 14 mV/K temperature coefficient, 60 μA reverse current at VR = 16 V, and non-repetitive surge capability up to 1.5 A.
Technical Context
This device operates as a two-terminal shunt voltage reference, maintaining stable output voltage across load variations by conducting reverse current above its specified Zener knee. Its junction temperature range spans −65 °C to +150 °C, with thermal resistance from junction to ambient of 415 K/W on FR4 PCB.
The BZX384-A20-Q exhibits a typical forward voltage of 0.9 V at 10 mA and 1.1 V at 100 mA, while its reverse characteristics are defined at IZ = 5 mA, where VZ = 19.8–20.2 V, rdif ≤ 225 Ω, and temperature coefficient SZ = +14 mV/K - indicating positive drift with temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VZ | 19.8 V to 20.2 V at IZ = 5 mA - ensures precise 20 V regulation within ±1 % tolerance for feedback and reference circuits. |
| Total Power Dissipation Ptot | 300 mW at Tamb ≤ 25 °C - defines maximum continuous DC power handling on standard FR4 PCB. |
| Differential Resistance rdif | ≤225 Ω at IZ = 5 mA - determines regulation stiffness; lower value improves load/line regulation performance. |
| Reverse Current IR | 60 μA max at VR = 16 V - quantifies leakage below breakdown, critical for low-power standby and sensing nodes. |
| Temperature Coefficient SZ | +14 mV/K at IZ = 5 mA - indicates predictable positive VZ drift with temperature, enabling compensation in precision references. |
| Non-repetitive Peak Reverse Current IZSM | 1.5 A for tp = 100 μs - supports transient overvoltage clamping in ESD/surge protection stages. |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 1.35 mm × 0.85 mm body size, cathode marked by bar on top surface.
| 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 reverse-bias path for regulation current. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood and infotainment systems requiring robustness to thermal cycling and humidity. |
| ±1 % VZ tolerance | Enables high-accuracy voltage references without trimming, reducing BOM count in ADAS sensor biasing and MCU supply monitoring. |
| Low rdif (225 Ω) | Minimizes output voltage shift under varying load current, improving stability in feedback loops of DC-DC converters. |
| 1.5 A surge rating | Provides single-event transient suppression capability per IEC 61000-4-5 Level 3 without external TVS stacking. |
| SOD323 footprint | Supports high-density PCB layouts in space-constrained modules such as automotive ECUs and battery management ICs. |
Applications
| Automotive Sensor Biasing | Power Supply Feedback Reference |
|---|---|
|
Use Scenario: Providing stable 20 V bias to analog front-end amplifiers in wheel speed or pressure sensors. IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed reference potential for signal conditioning circuitry. Use Value: ±1 % VZ tolerance ensures <10 mV error in sensor excitation, directly improving measurement linearity and repeatability. |
Use Scenario: Setting output voltage in isolated flyback converter feedback network via optocoupler divider. IC Role / Device Role / Timing Role: Precision Zener element defining regulated output threshold in secondary-side error detection. Use Value: Low 225 Ω rdif maintains regulation accuracy across load transients, reducing output ripple by up to 15 mV. |
| Microcontroller Supply Monitoring | Overvoltage Clamp for CAN Transceivers |
|
Use Scenario: Detecting brown-out or overvoltage conditions on 12 V automotive MCU rails using resistor-divider + comparator. IC Role / Device Role / Timing Role: Stable 20 V reference input to comparator for accurate threshold detection independent of supply variation. Use Value: +14 mV/K SZ enables predictable threshold shift with temperature, simplifying calibration across −40 °C to +125 °C. |
Use Scenario: Clamping induced transients on CAN_H/CAN_L lines during load dump or ESD events. IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing surge energy before it reaches sensitive transceiver inputs. Use Value: 1.5 A IZSM rating handles 100 μs surges per ISO 7637-2 Pulse 1/2a, eliminating need for larger discrete TVS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B20-Q | ±2 % VZ tolerance (19.6–20.4 V), higher rdif (250 Ω), same package and surge rating. | Acceptable where tighter regulation is not required, e.g., non-critical power sequencing or coarse voltage detection. | Select when cost sensitivity outweighs precision needs and system-level calibration compensates for wider tolerance. |
| MMSZ4684T1G | ±5 % VZ (19–21 V), 500 mW Ptot, SOD-123 package, no AEC-Q101 qualification. | Suitable for industrial/commercial power supplies but not automotive due to lack of automotive qualification and looser tolerance. | Choose only for non-automotive designs where higher power margin is needed and qualification is not mandated. |
Compared with BZX384-B20-Q and MMSZ4684T1G, the BZX384-A20-Q delivers superior regulation accuracy and automotive-grade reliability, making it the optimal choice for safety-critical voltage references where ±1 % tolerance and AEC-Q101 compliance are mandatory.
Availability
BZX384-A20-Q is available at Aetrix Electronics and suitable for automotive sensor biasing, power supply feedback reference, microcontroller supply monitoring, and overvoltage clamp for CAN transceivers requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX384-A20-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 essential semiconductors for automotive, industrial, and consumer markets.
The BZX384-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for precision voltage reference and transient protection in harsh-environment electronic control units.
FAQ
What is the maximum continuous reverse current the BZX384-A20-Q can handle at 25 °C?
The device does not specify a maximum continuous reverse current; instead, its safe operating limit is defined by total power dissipation. At 25 °C ambient, Ptot = 300 mW constrains IZ to ≤15 mA when regulating at 20 V (since P = V × I). Derating applies above 25 °C per the 415 K/W thermal resistance.
How does the +14 mV/K temperature coefficient affect circuit design?
The positive temperature coefficient means VZ increases by ~14 mV per Kelvin rise in junction temperature. In precision references, this requires either temperature-compensated resistor dividers or system-level calibration across operating temperature ranges to maintain accuracy within specification.
Can BZX384-A20-Q replace BZX384-C20-Q in an existing design?
No - the BZX384-C20-Q has ±5 % tolerance (18.8–21.2 V), significantly wider than the A-grade's ±1 % (19.8–20.2 V). Substituting may cause out-of-spec behavior in feedback loops or voltage monitors relying on tight regulation, especially at temperature extremes where rdif and SZ effects compound.
Is the SOD323 package compatible with standard reflow soldering profiles?
Yes - Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles. The recommended footprint uses 0.5 mm wide solder lands with 0.6 mm spacing (Fig. 12), and thermal pad design must follow the 1.1 mm × 0.8 mm outline to ensure reliable joint formation and avoid tombstoning.
BZX384-A20-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):
- 20 V
- Tolerance:
- ±1%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 14 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-A20-QX FAQ
1.How can I place an order for BZX384-A20-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A20-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-A20-QX reliable?
The price and inventory of BZX384-A20-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-A20-QX is usually 5 days.
3.What payment methods are accepted for BZX384-A20-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A20-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A20-QX?
BZX384-A20-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A20-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-A20-QX?
For technical support, including BZX384-A20-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A20-QX requirements.
6.How does Aetrix verify that BZX384-A20-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-A20-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-A20-QX meets industry standards.
7.What is the process for return or replacement of BZX384-A20-QX?
All BZX384-A20-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A20-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-A20-QX part is unused and in its original packaging.
Return procedure for BZX384-A20-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-A20-QX Tags
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MM5Z5V1ST1G
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