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Nexperia USA Inc. BZX384-B30-QX
- Part No.:
- BZX384-B30-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B30-QX.pdf
- Description:
- DIODE ZENER 30V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:8,347
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Product details
Overview
BZX384-B30-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 30 V nominal breakdown voltage at 2 mA test current, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides stable reference voltage in low-power biasing, overvoltage protection, and voltage-clamping circuits.
For engineers reviewing the BZX384-B30-QX datasheet, BZX384-B30-QX pinout, BZX384-B30-QX application, or BZX384-B30-QX equivalent, key selection criteria include its 30 V Zener voltage with ±2 % tolerance, 300 mW power rating at 25 °C, 150 °C maximum junction temperature, and AEC-Q101 qualification for under-hood automotive electronics.
Technical Context
This discrete Zener diode operates in reverse-biased breakdown mode to maintain a stable DC reference voltage across its terminals. Its regulation performance is defined by differential resistance (≤300 Ω at IZ = 2 mA), temperature coefficient (+21 mV/K typical), and low reverse leakage (≤100 nA at VR = 24 V).
Designed for surface-mount applications on FR4 PCBs with standard SOD323 footprint, it supports pulse operation up to 40 W non-repetitive peak reverse power (tp = 100 μs) and exhibits thermal resistance of 415 K/W (junction-to-ambient, free air).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V nominal at IZ = 2 mA; ±2 % tolerance ensures precise voltage reference stability in feedback loops. |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 PCB; defines continuous DC power handling limit in linear regulation. |
| Differential Resistance (rdif) | ≤300 Ω at IZ = 2 mA; determines output impedance and load regulation sensitivity. |
| Reverse Current (IR) | ≤100 nA at VR = 24 V; ensures minimal leakage in high-impedance bias networks. |
| Junction Temperature (Tj) | −65 °C to +150 °C; enables operation in under-hood automotive environments and industrial control enclosures. |
| AEC-Q101 Qualified | Qualified per Automotive Electronics Council stress test standard; validated for automotive-grade reliability and lifetime. |
| Package | SOD323 (SC-76); 2.3 mm × 1.35 mm footprint with 0.95 mm height; compatible with reflow and wave soldering per IPC-J-STD-020. |
Pinout & Package
SOD323 (SC-76) plastic surface-mounted package with cathode-marked end and 2-terminal configuration. Mounting requires standard FR4 PCB with tin-plated copper and specified solder land pattern (0.6 mm × 0.5 mm pads, 1.1 mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal; reverse-bias anode-to-cathode voltage establishes Zener conduction. |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path enabling voltage clamping at VZ. |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter regulation accuracy than ±5 % variants, reducing need for post-regulation trimming in precision analog circuits. |
| 300 mW power rating | Supports continuous operation in low-current bias networks (e.g., op-amp references, microcontroller reset supervisors) without heatsinking. |
| AEC-Q101 qualification | Validates robustness against temperature cycling, humidity, mechanical shock, and ESD-required for automotive body control modules and sensor interfaces. |
| Non-repetitive peak power: 40 W | Withstands transient surges (e.g., load dump, ESD events) up to 100 μs duration without degradation, enhancing system-level surge immunity. |
| Low thermal resistance (110 K/W junction-to-solder point) | Improves heat transfer to PCB copper, maintaining safe junction temperature during pulsed operation or elevated ambient conditions. |
Applications
| Automotive Sensor Biasing | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Providing stable 30 V reference to analog front-end of engine coolant temperature sensor interface. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference, setting bias point for signal conditioning amplifier and ADC input range. Use Value: ±2 % tolerance ensures consistent sensor gain calibration across production units; AEC-Q101 qualification guarantees operation at 125 °C under hood. |
Use Scenario: Generating clean 30 V threshold for external reset supervisor IC monitoring 24 V vehicle battery supply. IC Role / Device Role / Timing Role: Functions as precision clamp to define reset assertion voltage level independent of supply ripple. Use Value: 300 mW rating allows direct connection to battery rail with series resistor; low rdif minimizes hysteresis in reset detection window. |
| Industrial PLC Input Protection | LED Driver Voltage Clamp |
|
Use Scenario: Protecting 24 V digital input channel of programmable logic controller against overvoltage transients. IC Role / Device Role / Timing Role: Shunt clamping device limiting input voltage to 30 V during surge events (e.g., inductive kickback). Use Value: 40 W non-repetitive peak power rating absorbs 100 μs transients without failure; SOD323 footprint enables compact PCB layout near connector. |
Use Scenario: Clamping open-circuit voltage of constant-current LED driver to prevent damage during LED string disconnection. IC Role / Device Role / Timing Role: Acts as fail-safe voltage limiter across driver output terminals when no load is present. Use Value: 30 V breakdown matches typical LED string forward voltage margin; low leakage (<100 nA) avoids false triggering in standby mode. |
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-B30-Q | Identical electrical specs and AEC-Q101 qualification; differs only in marking code (M9 vs. QX) and packaging format (tape-and-reel variant). | No functional difference; suitable for identical automotive and industrial applications requiring 30 V ±2 % regulation. | Select BZX384-B30-QX for traceability requirements where X-suffix denotes specific lot-controlled distribution channel. |
| MMSZ5261B-TP | 30 V ±5 % tolerance, 500 mW Ptot, SOD-123 package; higher power but looser tolerance and no AEC-Q101 certification. | Acceptable for non-automotive consumer or industrial applications where cost or power margin outweighs precision and qualification needs. | Choose only if ±5 % tolerance and absence of automotive qualification are acceptable; not recommended for safety-critical or automotive designs. |
Compared with BZX384-B30-QX, BZX384-B30-Q offers identical performance with alternate marking, while MMSZ5261B-TP trades precision and automotive compliance for higher power and lower cost-making it unsuitable for AEC-Q101–mandated systems but viable for cost-sensitive non-automotive uses.
Availability
BZX384-B30-QX is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC input protection, microcontroller reset supervision, and LED driver voltage clamping requiring stable component supply with full traceability and AEC-Q101 compliance.
Supply support for BZX384-B30-QX 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 components and energy-efficient solutions.
The BZX384-Q series belongs to Nexperia's AEC-Q101–qualified Zener diode product line, engineered specifically for precision voltage reference and clamping in harsh-environment automotive electronics and industrial control systems.
FAQ
What is the maximum continuous reverse current this diode can handle at 30 V?
The BZX384-B30-QX is not rated for continuous reverse current at 30 V-it operates in Zener breakdown mode where current is externally limited by a series resistor. Its absolute maximum forward current is 250 mA, but sustained reverse conduction must be thermally managed to stay within 300 mW Ptot at ambient ≤25 °C. Derating is required above that temperature.
Does this part support reflow soldering, and what profile should be used?
Yes, BZX384-B30-QX is qualified for lead-free reflow soldering per IPC-J-STD-020. The recommended profile uses peak temperature ≤260 °C for ≤30 seconds, with ramp-up rate ≤3 °C/s and ramp-down rate ≤6 °C/s. Figure 12 in the datasheet specifies the exact SOD323 solder land pattern (0.6 mm × 0.5 mm pads, 1.1 mm pitch).
How does the temperature coefficient affect regulation accuracy over −40 °C to +125 °C?
At 30 V nominal, the BZX384-B30-QX has a typical temperature coefficient of +21 mV/K. Over −40 °C to +125 °C (165 K span), this introduces up to ±1.7 V drift from nominal-within expected variation for ±2 % tolerance parts. For high-stability applications, use low-tempco variants (e.g., BZX384-A30-Q) or compensate in circuit design.
Can this diode replace older BZX384-B30 parts without layout changes?
Yes-BZX384-B30-QX shares identical SOD323 package dimensions, pinout, thermal characteristics, and electrical specifications with legacy BZX384-B30 variants. The "QX" suffix denotes updated traceability and packaging; no PCB redesign or schematic change is needed for drop-in replacement in existing AEC-Q101–compliant designs.
BZX384-B30-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):
- 30 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 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-B30-QX FAQ
1.How can I place an order for BZX384-B30-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B30-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-B30-QX reliable?
The price and inventory of BZX384-B30-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-B30-QX is usually 5 days.
3.What payment methods are accepted for BZX384-B30-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B30-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B30-QX?
BZX384-B30-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B30-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-B30-QX?
For technical support, including BZX384-B30-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B30-QX requirements.
6.How does Aetrix verify that BZX384-B30-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-B30-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-B30-QX meets industry standards.
7.What is the process for return or replacement of BZX384-B30-QX?
All BZX384-B30-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B30-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-B30-QX part is unused and in its original packaging.
Return procedure for BZX384-B30-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B30-QX Tags
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