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Nexperia USA Inc. BZX384-A68-QX
- Part No.:
- BZX384-A68-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A68-QX.pdf
- Description:
- DIODE ZENER 68V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,417
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Product details
Overview
BZX384-A68-Q from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, with nominal breakdown voltage 68 V at 2 mA, 80 Ω differential resistance, and qualified to AEC-Q101 for automotive power rail stabilization.
For engineers reviewing the BZX384-A68-Q datasheet, BZX384-A68-Q pinout, BZX384-A68-Q application, or BZX384-A68-Q equivalent, this device serves as a precision low-power shunt regulator in ECU voltage reference, sensor biasing, and overvoltage clamp circuits where tight voltage tolerance and automotive-grade reliability are required.
Technical Context
This Zener diode operates in reverse-bias breakdown mode with a specified 68 V nominal working voltage at IZ = 2 mA, exhibiting a temperature coefficient of +47.6 mV/K and maximum reverse current of 0.25 μA at VR = 54.4 V. Its non-repetitive peak reverse power dissipation is rated at 40 W for 100 μs pulses.
The device features a thermal resistance from junction to ambient of 415 K/W on FR4 PCB and junction-to-solder-point of 110 K/W, enabling stable regulation under transient load conditions while maintaining Tj ≤ 150 °C. It uses silicon planar epitaxial construction optimized for low noise and repeatable breakdown characteristics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 68 V at IZ = 2 mA - defines precise clamping threshold for 54.4–72.0 V regulation range (±1 %) |
| Differential Resistance | 80 Ω max - ensures minimal output voltage shift under ±1 mA load variation |
| Reverse Current | 0.25 μA max at VR = 54.4 V - guarantees low leakage in standby or high-impedance bias networks |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - supports continuous operation in compact SMD layouts without forced cooling |
| Non-repetitive Peak Power | 40 W for tp = 100 μs - enables robust transient surge suppression in automotive load-dump scenarios |
| Junction Temperature | 150 °C max - allows reliable operation in under-hood environments per AEC-Q101 qualification |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic case with cathode-marked end (bar marking), 2.3 mm × 1.35 mm footprint, 0.45 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; reverse-bias anode-to-cathode voltage establishes Zener conduction |
| 2 (A) | Anode | Connected to ground or lower-potential reference; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics |
| ±1 % voltage tolerance | Enables accurate voltage referencing without post-production trimming in safety-critical subsystems |
| Low thermal resistance (110 K/W) | Minimizes junction temperature rise during pulsed operation, preserving long-term Zener stability |
| 40 W surge capability | Withstands ISO 7637-2 pulse 5a load-dump transients without degradation |
| SOD323 footprint compatibility | Supports automated placement and reflow soldering on standard 0.5 mm pitch land patterns |
Applications
| Automotive ECU Voltage Reference | Industrial Sensor Biasing |
|---|---|
Use Scenario: Providing stable 68 V reference for analog front-end circuitry in engine control modules. IC Role / Device Role / Timing Role: Shunt regulator establishing fixed reverse-bias potential for ADC reference dividers and op-amp input protection. Use Value: Maintains ±1 % reference accuracy across -40 °C to +125 °C ambient, meeting ASIL-B functional safety requirements. |
Use Scenario: Biasing high-voltage piezoresistive pressure sensors in hydraulic control systems. IC Role / Device Role / Timing Role: Precision Zener clamp limiting sensor excitation voltage to prevent dielectric breakdown. Use Value: 80 Ω dynamic impedance ensures <10 mV deviation under 100 μA sensor leakage variation. |
| Power Supply Overvoltage Clamp | Communications Interface Protection |
Use Scenario: Protecting 60 V DC bus monitoring ICs from transient overvoltage events. IC Role / Device Role / Timing Role: Fast-acting shunt element diverting surge energy during load dump or inductive kickback. Use Value: 40 W non-repetitive peak power rating absorbs 400 mJ pulses without parametric shift. |
Use Scenario: Guarding CAN transceiver supply pins against battery feed spikes in vehicle networking nodes. IC Role / Device Role / Timing Role: Low-capacitance (≤200 pF) voltage clamp placed directly at transceiver VCC input. Use Value: 0.25 μA reverse leakage avoids loading 5 V LDO outputs during normal CAN bus idle states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B68-Q | ±2 % tolerance (66.6–69.4 V range), higher rdif (150 Ω max) | Acceptable for non-critical biasing where cost sensitivity outweighs precision needs | Select when tighter voltage drift control is unnecessary and BOM cost reduction is prioritized |
| MMSZ5263B-TP | ±5 % tolerance (64.6–71.4 V), 350 mW Ptot, SOD-123 package | Larger footprint; not AEC-Q101 qualified; higher thermal resistance (500 K/W) | Use only in commercial-grade designs with relaxed reliability and space constraints |
Compared with BZX384-B68-Q and MMSZ5263B-TP, the BZX384-A68-Q delivers superior voltage accuracy and automotive qualification-critical for ECU reference design-while its SOD323 package enables higher board density than SOD-123 alternatives.
Availability
BZX384-A68-Q is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor conditioning, and power supply overvoltage protection requiring stable component supply with full traceability and AEC-Q101 compliance.
Supply support for BZX384-A68-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 discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.
The BZX384-Q series belongs to Nexperia's automotive-grade Zener regulator product line, engineered specifically for precision voltage reference and transient protection in harsh-environment electronic control units.
FAQ
What is the maximum reverse voltage before breakdown for BZX384-A68-Q?
The BZX384-A68-Q exhibits a nominal Zener voltage of 68 V at 2 mA test current, with guaranteed minimum and maximum values of 67.32 V and 68.68 V respectively under ±1 % tolerance. Breakdown occurs sharply within this band; operation below 54.4 V (80 % of nominal) yields sub-μA leakage.
Can BZX384-A68-Q be used in parallel for higher power handling?
No-Zener diodes must not be paralleled due to mismatched breakdown voltages causing current hogging. For higher power, use a single higher-rated device like PZMxxxA series or add external series resistance to balance current sharing if absolutely necessary.
Is the SOD323 package compatible with standard reflow profiles?
Yes-the SOD323 footprint matches IPC-7351B standard land pattern (0.5 mm pad pitch, 0.6 mm × 0.8 mm pads). Nexperia specifies JEDEC J-STD-020-compliant reflow with peak temperature ≤ 260 °C and time above liquidus ≤ 60 seconds.
How does temperature affect the 68 V regulation point?
The BZX384-A68-Q has a positive temperature coefficient of +47.6 mV/K, meaning its Zener voltage increases by approximately 47.6 mV per degree Celsius rise in junction temperature. At 125 °C junction, regulation shifts ~4.8 V higher than at 25 °C.
BZX384-A68-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):
- 68 V
- Tolerance:
- ±1%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 240 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 47.6 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-A68-QX FAQ
1.How can I place an order for BZX384-A68-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A68-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-A68-QX reliable?
The price and inventory of BZX384-A68-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-A68-QX is usually 5 days.
3.What payment methods are accepted for BZX384-A68-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A68-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A68-QX?
BZX384-A68-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A68-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-A68-QX?
For technical support, including BZX384-A68-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A68-QX requirements.
6.How does Aetrix verify that BZX384-A68-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-A68-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-A68-QX meets industry standards.
7.What is the process for return or replacement of BZX384-A68-QX?
All BZX384-A68-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A68-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-A68-QX part is unused and in its original packaging.
Return procedure for BZX384-A68-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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