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Nexperia USA Inc. BZX384-B12-QX
- Part No.:
- BZX384-B12-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B12-QX.pdf
- Description:
- DIODE ZENER 12V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,184
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Product details
Overview
BZX384-B12-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 12 V nominal breakdown at 5 mA, with 300 mW total power dissipation and AEC-Q101 qualification for automotive voltage reference and overvoltage protection circuits.
For engineers reviewing the BZX384-B12-QX datasheet, BZX384-B12-QX pinout, BZX384-B12-QX application, or BZX384-B12-QX equivalent, key selection criteria include Zener voltage tolerance (±2 %), thermal resistance (110 K/W junction-to-solder-point), non-repetitive peak reverse power (40 W), cathode/anode polarity marking, and automotive-grade reliability validation per AEC-Q101.
Technical Context
This device operates as a two-terminal shunt voltage reference, maintaining stable 12 V regulation under reverse-biased conditions with differential resistance ≤150 Ω at IZ = 5 mA and temperature coefficient of +6.0 mV/K. It exhibits low reverse leakage (<0.1 μA at VR = 9.4 V) and supports surge handling up to 40 W for 100 μs pulses.
Designed for surface-mount use on FR4 PCBs with single-sided copper, its thermal performance relies on solder-point conduction (Rth(j-sp) = 110 K/W) rather than ambient convection (Rth(j-a) = 415 K/W), making layout-dependent thermal management critical for sustained 300 mW operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.80 V to 12.20 V at IZ = 5 mA - ensures precise 12 V regulation within ±2 % tolerance for feedback and reference circuits |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on standard FR4 PCB - defines maximum continuous DC power handling before thermal derating |
| Differential Resistance (rdif) | ≤150 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity in shunt reference applications |
| Reverse Current (IR) | <0.1 μA at VR = 9.4 V - guarantees minimal quiescent current draw in standby or low-power monitoring circuits |
| Non-repetitive Peak Reverse Power (PZSM) | 40 W for tp = 100 μs - enables transient overvoltage clamping without failure in automotive load-dump or ESD scenarios |
| Junction Temperature (Tj) | −65 °C to +150 °C - supports operation across full automotive ambient range including under-hood environments |
| AEC-Q101 Qualified | Yes - validated for automotive discrete semiconductor stress testing, enabling use in safety-critical vehicle subsystems |
Pinout & Package
Package: SOD323 (SC-76), 2-pin surface-mount plastic package with cathode marked by a bar on the top surface. Dimensions: 1.8 mm × 1.35 mm × 0.95 mm (L × W × H); recommended reflow footprint per Figure 12.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-bias voltage applied between cathode and anode to enable Zener conduction |
| 2 | Anode (A) | Connected to circuit ground or lower-potential rail; polarity must be observed to avoid forward conduction during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant - meets stress test requirements for vibration, temperature cycling, and humidity robustness in vehicle ECUs |
| Precision voltage tolerance | ±2 % at IZ = 5 mA - tighter than standard ±5 % Zeners, reducing calibration overhead in analog sensing front-ends |
| Low thermal resistance to solder point | Rth(j-sp) = 110 K/W - enables effective heat transfer through cathode pad, supporting higher pulse power in compact layouts |
| Controlled temperature coefficient | +6.0 mV/K at IZ = 5 mA - predictable drift behavior allows compensation in temperature-sensitive reference designs |
| Small-footprint packaging | SOD323 outline (1.8 × 1.35 mm) - saves board space in dense automotive modules like body control units and ADAS sensor interfaces |
Applications
| Engine Control Unit (ECU) Reference | Infotainment System Power Monitor |
|---|---|
Use Scenario: Providing stable 12 V reference for ADC input scaling and microcontroller supply supervision in gasoline/diesel engine control modules. IC Role / Device Role / Timing Role: Shunt voltage reference regulating feedback node of LDOs and biasing comparators for battery voltage detection. Use Value: ±2 % tolerance and AEC-Q101 qualification ensure consistent ADC accuracy and fail-safe shutdown triggering across −40 °C to +125 °C operating range. |
Use Scenario: Monitoring 12 V vehicle bus voltage in head unit power management to detect brown-out or overvoltage events. IC Role / Device Role / Timing Role: Zener clamp protecting supervisor IC inputs and enabling accurate threshold detection via resistor divider. Use Value: 40 W non-repetitive surge rating absorbs load-dump transients without degradation, preserving system uptime during alternator regulation faults. |
| LED Headlamp Current Regulation | Telematics Module ESD Protection |
Use Scenario: Stabilizing reference voltage for constant-current LED driver ICs in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Precision voltage source setting current-sense amplifier gain and PWM comparator thresholds. Use Value: Low differential resistance (≤150 Ω) minimizes regulation error under varying LED forward voltage, maintaining consistent lumen output. |
Use Scenario: Protecting CAN transceiver and GNSS receiver inputs against ISO 10605 ESD events in vehicle tracking modules. IC Role / Device Role / Timing Role: Low-capacitance (≤15 pF) shunt clamp diverting ESD current away from sensitive RF and digital pins. Use Value: 110 K/W junction-to-solder-point thermal resistance enables rapid heat dissipation during 15 kV contact discharge, preventing latch-up. |
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-B12-E3-08 | Same electrical specs, but packaged in tape-and-reel per EIA-481 standard; no AEC-Q101 documentation provided | Intended for industrial/commercial use only; not validated for automotive temperature cycling or humidity testing | Select when cost sensitivity outweighs automotive qualification requirements and board-level reliability testing is performed internally |
| MMSZ5242B-TP | 12 V ±5 % tolerance, 500 mW Ptot, SOD-123 package; higher power but looser tolerance and no AEC-Q101 status | Used in consumer power supplies where ±5 % regulation suffices and thermal margin exceeds 300 mW needs | Choose for non-automotive applications requiring higher continuous power or legacy footprint compatibility |
Compared with BZX384-B12-QX, the BZX384-B12-E3-08 lacks documented automotive qualification despite identical Zener parameters, while MMSZ5242B-TP trades precision and reliability for higher power and broader commercial availability-making the QX variant uniquely suited for AEC-Q101–mandated automotive voltage references.
Availability
BZX384-B12-QX is available at Aetrix Electronics and suitable for automotive ECU reference design, infotainment power monitoring, and LED headlamp current regulation requiring stable component supply with guaranteed AEC-Q101 compliance and traceable lot history.
Supply support for BZX384-B12-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 logic, discrete, and MOSFET devices, with leadership in automotive-qualified components and energy-efficient solutions.
The BZX384-Q series belongs to Nexperia's automotive Zener diode product line, engineered specifically for precision voltage reference and transient suppression in harsh-environment vehicle subsystems such as powertrain, chassis, and body electronics.
FAQ
What is the maximum continuous reverse current this diode can handle at 12 V regulation?
The BZX384-B12-QX is rated for a maximum continuous reverse current of 25 mA at 12 V, derived from its 300 mW power dissipation limit (P = V × I → I = 300 mW / 12 V ≈ 25 mA). Operation beyond this current requires thermal derating based on ambient temperature and PCB copper area.
How does the cathode marking appear on the SOD323 package?
The cathode is marked by a visible bar printed on the top surface of the SOD323 package, aligned with pin 1. This matches the simplified outline in Table 2 of the datasheet and corresponds to the "K" terminal in the pinning diagram, ensuring correct orientation during automated placement.
Is this diode suitable for use in a 24 V truck electrical system?
No - the BZX384-B12-QX is specified for 12 V nominal regulation and is not rated for direct connection to 24 V systems. In 24 V environments, it would experience excessive reverse power dissipation unless used with appropriate series current limiting (e.g., ≥1 kΩ resistor) and verified thermal margin on the PCB.
Does the ±2 % tolerance apply across the full operating temperature range?
No - the ±2 % tolerance is specified at Tj = 25 °C and IZ = 5 mA. Over −65 °C to +150 °C, the voltage drift follows a temperature coefficient of +6.0 mV/K, resulting in a total variation of approximately ±3.6 % across the full range, as confirmed in Table 8 and Figure 7.
BZX384-B12-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):
- 12 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 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-B12-QX FAQ
1.How can I place an order for BZX384-B12-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B12-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-B12-QX reliable?
The price and inventory of BZX384-B12-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-B12-QX is usually 5 days.
3.What payment methods are accepted for BZX384-B12-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B12-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B12-QX?
BZX384-B12-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B12-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-B12-QX?
For technical support, including BZX384-B12-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B12-QX requirements.
6.How does Aetrix verify that BZX384-B12-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-B12-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-B12-QX meets industry standards.
7.What is the process for return or replacement of BZX384-B12-QX?
All BZX384-B12-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B12-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-B12-QX part is unused and in its original packaging.
Return procedure for BZX384-B12-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B12-QX Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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