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Nexperia USA Inc. BZX384-B68-QX
- Part No.:
- BZX384-B68-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B68-QX.pdf
- Description:
- DIODE ZENER 68V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,898
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Product details
Overview
BZX384-B68-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 68 V nominal breakdown voltage at 2 mA, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive voltage reference and overvoltage protection circuits.
For engineers reviewing the BZX384-B68-QX datasheet, BZX384-B68-QX pinout, BZX384-B68-QX application, or BZX384-B68-QX equivalent, this part serves as a precision low-power shunt regulator in ECU power rails, sensor biasing networks, and CAN transceiver clamp circuits where stable 68 V reference and automotive-grade reliability are required.
Technical Context
This device operates in reverse-biased Zener breakdown mode with a specified 68 V working voltage at IZ = 2 mA, differential resistance ≤475 Ω, and temperature coefficient of +47.6 mV/K at IZ = 2 mA. It maintains regulation under transient surges up to 40 W (100 μs pulse) and supports junction temperatures from –65 °C to +150 °C.
Designed for surface-mount use on FR4 PCBs with single-sided copper, it exhibits Rth(j-a) = 415 K/W and Rth(j-sp) = 110 K/W, enabling thermal management in compact automotive modules. Its cathode-anode polarity is marked by a bar on the SOD323 body per IEC 60747-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 68 V nominal at IZ = 2 mA; ±2 % tolerance ensures tight regulation in feedback loops requiring precise 68 V clamping. |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C; limits continuous DC current to ~4.4 mA at 68 V, defining steady-state thermal envelope. |
| Differential Resistance | ≤475 Ω at IZ = 2 mA; determines output impedance and load regulation error in shunt reference applications. |
| Reverse Current | ≤0.2 μA at VR = 54.4 V (80 % of VZ); ensures minimal leakage in high-impedance bias networks. |
| Non-repetitive Surge | 40 W peak for 100 μs; enables robust transient suppression against ISO 7637-2 pulse 1/2a/5a in automotive power lines. |
| Temperature Coefficient | +47.6 mV/K at IZ = 2 mA; quantifies VZ drift across operating temperature range for stability analysis. |
| Junction Temperature | –65 °C to +150 °C; supports operation in engine bay and transmission control units without derating. |
Pinout & Package
Package: SOD323 (SC-76), plastic surface-mounted device with 2 leads, 2.7 mm × 1.6 mm footprint, 0.45 mm nominal height, and cathode identified by marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-bias anode-to-cathode voltage establishes Zener conduction path. |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes current path during regulation and surge events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use per stress test requirements including HTGB, HTRB, and temperature cycling. |
| ±2 % voltage tolerance | Enables tighter closed-loop control in voltage monitoring circuits versus ±5 % variants, reducing calibration overhead. |
| 40 W non-repetitive surge rating | Withstands ISO 7637-2 Pulse 5a (load dump) without failure when used with appropriate series impedance. |
| SOD323 footprint compatibility | Standardized 2.7 mm × 1.6 mm land pattern allows drop-in replacement in space-constrained ECUs and ADAS modules. |
| 150 °C maximum junction temperature | Permits operation adjacent to power MOSFETs or DC-DC converters without thermal shutdown in under-hood environments. |
Applications
| Engine Control Unit (ECU) Power Monitoring | CAN Transceiver Clamp Protection |
|---|---|
|
Use Scenario: Monitoring 12 V battery-derived supply rails for overvoltage detection prior to LDO input. IC Role / Device Role / Timing Role: Shunt regulator providing stable 68 V reference to comparator input for threshold detection. Use Value: Enables accurate trip point at 68 V ±1.36 V, preventing false triggers during cranking transients while surviving load dump pulses. |
Use Scenario: Clamping common-mode voltage spikes on CAN_H/CAN_L lines in automotive gateways. IC Role / Device Role / Timing Role: Bidirectional transient suppressor limiting differential voltage swing to protect PHY interface. Use Value: Absorbs 40 W surges within 100 μs without degradation, maintaining CAN signal integrity during ESD and load dump events. |
| ABS Sensor Biasing Network | Transmission Control Module Reference |
|
Use Scenario: Providing stable excitation voltage to Hall-effect wheel speed sensors in anti-lock braking systems. IC Role / Device Role / Timing Role: Precision Zener reference establishing fixed bias point for sensor Wheatstone bridge. Use Value: Delivers 68 V ±2 % across –40 °C to +125 °C, ensuring consistent sensor output amplitude and signal-to-noise ratio. |
Use Scenario: Generating reference voltage for analog-to-digital conversion of solenoid current feedback in automatic transmissions. IC Role / Device Role / Timing Role: Stable shunt regulator supplying reference to ADC voltage divider network. Use Value: Maintains <0.2 μA leakage at 54.4 V, minimizing measurement offset error in high-impedance sensing paths. |
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 | Identical electrical specs and AEC-Q101 qualification; differs only in marking code (N8 vs QX) and packaging variant. | No functional difference; both support same automotive temperature and surge requirements. | Select BZX384-B68-QX when traceability to specific production lot or tape-and-reel configuration is required. |
| MMSZ5262BT1G | 68 V ±5 % tolerance, 500 mW Ptot, SOD-123 package; higher power but looser voltage tolerance and no AEC-Q101 certification. | Suitable for industrial power supplies but not qualified for automotive safety-critical functions. | Choose only for cost-sensitive non-automotive designs where ±5 % regulation and absence of automotive qualification are acceptable. |
Compared with BZX384-B68-QX, the BZX384-B68-Q offers identical performance with alternate marking, while MMSZ5262BT1G trades AEC-Q101 compliance and tight tolerance for higher power and lower cost-making it unsuitable for automotive ECU or transmission control where regulatory validation and precision are mandatory.
Availability
BZX384-B68-QX is available at Aetrix Electronics and suitable for automotive electronic control units, CAN bus protection circuits, and transmission control modules requiring stable component supply with full AEC-Q101 documentation and lot traceability.
Supply support for BZX384-B68-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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on automotive, industrial, and mobile markets.
The BZX384-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive voltage regulation, reference, and transient protection where long-term stability and process-controlled parametric consistency are critical.
FAQ
What is the maximum continuous reverse current at 68 V?
The BZX384-B68-QX is not rated for continuous operation at its nominal Zener voltage. At VR = 68 V, reverse current exceeds specification limits; sustained operation requires current limiting to maintain IZ ≤ 2 mA, yielding ~136 μW dissipation well below the 300 mW rating.
Can this diode be used in parallel for higher power handling?
No-Zener diodes exhibit negative temperature coefficients and parameter spread that cause current hogging. Parallel connection risks thermal runaway and premature failure; use a single higher-power device like PZMxxxA series if >300 mW is needed.
How does the temperature coefficient affect regulation accuracy over –40 °C to +125 °C?
With +47.6 mV/K coefficient at IZ = 2 mA, VZ increases by ~7.14 V across the full range. For applications requiring <1 % drift, active compensation or tighter-tolerance variants (e.g., BZX384-A68-Q) must be selected.
Is the SOD323 package compatible with standard reflow profiles?
Yes-the SOD323 outline complies with JEDEC J-STD-020 moisture sensitivity level 1 and supports standard lead-free reflow profiles (peak 260 °C, 30 s max). Footprint dimensions match Figure 12 in the datasheet: 0.6 mm pad width, 1.65 mm pad length, 2.2 mm center-to-center spacing.
BZX384-B68-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:
- ±2%
- 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-B68-QX FAQ
1.How can I place an order for BZX384-B68-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B68-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-B68-QX reliable?
The price and inventory of BZX384-B68-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-B68-QX is usually 5 days.
3.What payment methods are accepted for BZX384-B68-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B68-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B68-QX?
BZX384-B68-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B68-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-B68-QX?
For technical support, including BZX384-B68-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B68-QX requirements.
6.How does Aetrix verify that BZX384-B68-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-B68-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-B68-QX meets industry standards.
7.What is the process for return or replacement of BZX384-B68-QX?
All BZX384-B68-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B68-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-B68-QX part is unused and in its original packaging.
Return procedure for BZX384-B68-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B68-QX Tags
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MM5Z5V1ST1G
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