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Nexperia USA Inc. BZX384-B20-QX
- Part No.:
- BZX384-B20-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B20-QX.pdf
- Description:
- DIODE ZENER 20V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,679
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Product details
Overview
BZX384-B20-Q from Nexperia is a ±2 % 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-B20-Q datasheet, BZX384-B20-Q pinout, BZX384-B20-Q application, or BZX384-B20-Q equivalent, this part serves as a precision low-power shunt regulator with 14 mV/K temperature coefficient, 225 Ω max differential resistance, and 55 μA reverse current at 16 V, supporting stable biasing and clamping in space-constrained automotive ECUs and sensor interfaces.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable 20 V reference across its terminals under regulated current conditions. Its ±2 % tolerance ensures predictable clamping thresholds without trimming, and AEC-Q101 qualification confirms robustness against thermal cycling, humidity, and mechanical stress in automotive environments.
The device exhibits 225 Ω maximum differential resistance at IZ = 5 mA, enabling tight regulation under load variation, and features a 14 mV/K temperature coefficient optimized for mid-range Zener voltages-balancing stability and sensitivity for feedback loop compensation in DC-DC converters and LDO monitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VZ | 19.6 V to 20.4 V at IZ = 5 mA - defines precise clamping threshold for overvoltage protection |
| Tolerance | ±2 % - enables accurate voltage referencing without external calibration |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Differential Resistance rdif | ≤225 Ω at IZ = 5 mA - determines regulation stiffness and output impedance in shunt configuration |
| Reverse Current IR | ≤55 μA at VR = 16 V - defines leakage-induced error in high-impedance bias networks |
| Temperature Coefficient SZ | +14 mV/K at IZ = 5 mA - quantifies drift of VZ per degree Celsius for thermal design margining |
| Non-repetitive Peak Power | 40 W for tp = 100 μs - supports transient surge suppression in CAN/LIN bus protection stages |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package with 2 leads; cathode marked by bar on top surface; footprint compatible with reflow and wave soldering per Nexperia's recommended land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated voltage node; carries reverse current during Zener conduction |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt path for voltage stabilization |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HAST, and mechanical shock |
| ±2 % voltage tolerance | Reduces need for binning or post-assembly trimming in production voltage reference designs |
| 300 mW power rating | Supports continuous regulation in low-current bias networks without heatsinking |
| 40 W non-repetitive peak power | Enables use in transient voltage suppression for 12 V automotive supply rails |
| SOD323 package size | 1.35 mm × 0.85 mm footprint minimizes PCB area in compact ECU and ADAS modules |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for microcontroller ADC inputs monitoring battery voltage and lamp status. IC Role / Device Role / Timing Role: Shunt Zener regulator providing stable 20 V reference to voltage divider network feeding MCU analog input. Use Value: ±2 % tolerance ensures consistent ADC code mapping across temperature and unit variance, reducing calibration overhead in production. |
Use Scenario: Clamping amplifier output to prevent overvoltage damage during transients in 4–20 mA loop transmitter circuits. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as fast-acting voltage limiter at op-amp output stage. Use Value: 40 W peak power rating absorbs 100 μs surges without degradation, extending system uptime in factory automation environments. |
| Automotive Infotainment Power Sequencing | Consumer IoT Battery Monitoring |
Use Scenario: Providing enable threshold for PMIC sequencing logic triggered at 20 V system rail. IC Role / Device Role / Timing Role: Zener-based comparator input reference defining power-on reset point. Use Value: 14 mV/K temperature coefficient allows predictable timing margin shift across -40 °C to +125 °C operating range. |
Use Scenario: Biasing voltage supervisor IC that triggers low-battery alert when Li-ion pack drops below 20 V threshold. IC Role / Device Role / Timing Role: Precision shunt reference setting trip point for undervoltage detection circuit. Use Value: 225 Ω differential resistance ensures minimal loading error on high-impedance supervisor input, preserving accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B20 | Same electrical specs but non-automotive grade; lacks AEC-Q101 qualification and tighter traceability controls | Restricted to commercial/industrial use; not approved for under-hood automotive deployment | Select when cost sensitivity outweighs automotive compliance requirements |
| MMSZ5248B-TP | 20 V ±5 % tolerance; higher 350 mW power rating; SOD-123 package (larger footprint) | Lower precision but higher surge resilience; requires PCB layout revision for pad compatibility | Choose for legacy designs needing drop-in replacement with relaxed voltage accuracy |
Compared with BZX384-B20-Q, BZX384-B20 sacrifices automotive qualification for lower cost, while MMSZ5248B-TP trades ±2 % tolerance for higher surge capacity and larger package-making the Q-series optimal for new automotive designs demanding precision, reliability, and miniaturization.
Availability
BZX384-B20-Q is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, infotainment power sequencing, and consumer IoT battery monitoring requiring stable component supply with full AEC-Q101 traceability.
Supply support for BZX384-B20-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 leading global semiconductor manufacturer specializing in high-performance, reliable discrete and logic devices, with core expertise in automotive-qualified components.
The BZX384-Q series belongs to Nexperia's automotive Zener diode product line, engineered specifically for precision voltage regulation and transient protection in harsh-environment vehicle systems.
FAQ
What is the maximum continuous reverse current the BZX384-B20-Q can sustain at 25 °C ambient?
The BZX384-B20-Q is rated for 300 mW total power dissipation at Tamb ≤ 25 °C on standard FR4 PCB. At its 20 V breakdown voltage, this corresponds to a maximum continuous reverse current of 15 mA (300 mW ÷ 20 V), assuming no additional thermal derating from board layout or airflow constraints.
How does the 14 mV/K temperature coefficient affect regulation accuracy over automotive temperature range?
With a +14 mV/K coefficient, the BZX384-B20-Q's breakdown voltage shifts +1.96 V from −40 °C to +125 °C (ΔT = 165 K). This results in a total VZ range of 19.6 V to 22.4 V across the full automotive junction temperature span, requiring system-level compensation if sub-1 % absolute accuracy is needed.
Can the BZX384-B20-Q be used in parallel for higher power dissipation?
No-Zener diodes exhibit negative temperature coefficients and mismatched characteristics, causing current hogging when paralleled. The BZX384-B20-Q must be used individually; for higher power, select a single higher-rated device such as PZM20A or consider active regulation with a transistor-assisted shunt.
What marking code identifies the BZX384-B20-Q on the SOD323 package?
The BZX384-B20-Q is marked with "M5" on the top surface of the SOD323 package, where the bar adjacent to the marking indicates the cathode terminal (Pin 1), per Nexperia's standardized coding in Table 4 of the datasheet.
BZX384-B20-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:
- ±2%
- 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-B20-QX FAQ
1.How can I place an order for BZX384-B20-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B20-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-B20-QX reliable?
The price and inventory of BZX384-B20-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-B20-QX is usually 5 days.
3.What payment methods are accepted for BZX384-B20-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B20-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B20-QX?
BZX384-B20-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B20-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-B20-QX?
For technical support, including BZX384-B20-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B20-QX requirements.
6.How does Aetrix verify that BZX384-B20-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-B20-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-B20-QX meets industry standards.
7.What is the process for return or replacement of BZX384-B20-QX?
All BZX384-B20-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B20-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-B20-QX part is unused and in its original packaging.
Return procedure for BZX384-B20-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B20-QX Tags
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