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Nexperia USA Inc. BZX384-C75-QX
- Part No.:
- BZX384-C75-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-C75-QX.pdf
- Description:
- DIODE ZENER 74.5V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,010
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Product details
Overview
BZX384-C75-QX from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 75 V nominal breakdown voltage at IZ = 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-C75-QX datasheet, BZX384-C75-QX pinout, BZX384-C75-QX application, or BZX384-C75-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 75 V regulation under transient conditions is required.
Technical Context
This device operates in reverse-biased Zener breakdown mode with a specified working voltage of 70.0–79.0 V at IZ = 2 mA, differential resistance ≤500 Ω, and temperature coefficient of +0.05 mV/K - indicating minimal voltage drift across temperature in automotive ambient ranges.
It supports non-repetitive peak reverse power dissipation up to 40 W (tp = 100 μs), reverse current ≤255 μA at VR = 60 V, and junction temperature operation from –65 °C to +150 °C, meeting stringent reliability requirements for under-hood electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VZ | 70.0–79.0 V at IZ = 2 mA - defines clamping threshold for overvoltage protection in 72 V battery systems. |
| Tolerance | ±5 % - enables cost-effective selection for non-critical regulation where tight voltage accuracy is not required. |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 PCB - sets continuous DC power handling limit for steady-state biasing. |
| Non-repetitive Peak Power | 40 W (100 μs pulse) - supports surge immunity against load-dump transients per ISO 7637-2. |
| Differential Resistance | ≤500 Ω - determines regulation stiffness; lower values improve line/load regulation performance. |
| Reverse Current IR | ≤255 μA at VR = 60 V - ensures low leakage in high-impedance sensing nodes. |
| Junction Temperature Range | –65 °C to +150 °C - validated for under-hood placement in automotive engine control modules. |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic case with cathode marked by bar; dimensions 1.8 × 1.35 × 0.45 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-bias anode-to-cathode voltage establishes Zener conduction. |
| 2 | Anode (A) | Typically grounded or tied to lower-potential rail; completes current path during regulation or clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity testing, and mechanical shock per discrete semiconductor stress standards. |
| Low thermal resistance | Rth(j-sp) = 110 K/W - enables efficient heat transfer from junction to solder point on standard FR4 PCB. |
| Stable temperature coefficient | +0.05 mV/K at IZ = 2 mA - minimizes voltage drift over –40 °C to +125 °C operating range. |
| High surge capability | IZSM = 0.20 A (100 μs) - withstands short-duration transients without degradation in clamp performance. |
| Small footprint | SOD323 package occupies <1.0 mm² board area - suitable for space-constrained ADAS sensor modules and infotainment power supplies. |
Applications
| Automotive ECU Power Clamp | Industrial Sensor Bias Reference |
|---|---|
Use Scenario: Clamping 72 V battery rail against load-dump spikes in engine control units. IC Role / Device Role / Timing Role: Shunt regulator providing passive overvoltage protection by conducting excess current above 75 V threshold. Use Value: Limits voltage excursion to ≤79 V during ISO 7637-2 Pulse 5a events, protecting downstream 80 V-rated MOSFETs and microcontrollers. |
Use Scenario: Providing stable bias voltage for high-voltage current-sense amplifiers in motor drives. IC Role / Device Role / Timing Role: Precision Zener reference establishing fixed 75 V common-mode input level. Use Value: Enables accurate 12-bit ADC measurement of 0–70 V bus voltages with <±0.5 % full-scale error due to tight VZ tolerance and low rdif. |
| Telecom Line Surge Protection | Medical Imaging HV Supply Monitor |
Use Scenario: Protecting RS-485 transceivers connected to long outdoor cables subject to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-acting clamp limiting differential voltage between A/B lines to safe levels. Use Value: Absorbs 40 W transient energy within 100 μs, preventing latch-up or destruction of isolated data interface ICs. |
Use Scenario: Monitoring 75 V auxiliary supply in X-ray detector front-end modules. IC Role / Device Role / Timing Role: Fail-safe voltage supervisor triggering shutdown if supply exceeds 79 V. Use Value: Provides deterministic trip point with <100 ns response time due to low junction capacitance (Cd ≈ 88.6 pF at 1 MHz), ensuring timely fault detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B75-Q | ±2 % tolerance (73.5–76.5 V), lower rdif (450 Ω), higher IZSM (0.25 A) | Better regulation stability in precision feedback loops; tighter VZ improves closed-loop accuracy. | Select when system-level voltage tolerance must be held within ±2.5 V and thermal margin is constrained. |
| MMSZ5265ET1G | ±5 % tolerance (71.25–78.75 V), SOD-123 package, Ptot = 500 mW, Rth(j-a) = 350 K/W | Higher continuous power rating but larger footprint; less optimized for automotive thermal cycling. | Choose for industrial power supplies requiring >300 mW DC dissipation, accepting larger board area and non-AEC-Q101 qualification. |
Compared with BZX384-B75-Q, the BZX384-C75-QX trades voltage accuracy for cost and surge robustness in transient-heavy environments; versus MMSZ5265ET1G, it offers superior automotive qualification and smaller footprint at the expense of continuous power headroom.
Availability
BZX384-C75-QX is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, telecom surge protectors, and medical imaging subsystems requiring stable component supply with AEC-Q101 compliance and SOD323 packaging.
Supply support for BZX384-C75-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, analog, and discrete components, with leadership in automotive-qualified devices and advanced packaging technologies.
The BZX384-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for voltage reference, overvoltage clamping, and biasing in harsh-environment automotive and industrial control systems.
FAQ
What is the maximum reverse voltage the BZX384-C75-QX can safely clamp?
The BZX384-C75-QX is rated for a maximum reverse working voltage of 79.0 V at IZ = 2 mA, with guaranteed clamping action up to this value. Its non-repetitive peak reverse power dissipation of 40 W allows brief excursions beyond 79 V during transients, provided pulse duration remains ≤100 μs and duty cycle is limited to avoid thermal runaway.
Does the BZX384-C75-QX require a series current-limiting resistor in all applications?
Yes - a series resistor is mandatory to limit Zener current to within its 300 mW continuous power rating and prevent thermal failure. For example, at 75 V regulation with 10 mA test current, a minimum 1.5 kΩ resistor is needed when biased from a 90 V source; design must also account for worst-case ambient temperature and PCB copper area.
How does the ±5 % tolerance affect circuit performance in precision voltage references?
The ±5 % tolerance (70.0–79.0 V) introduces up to ±4.5 V uncertainty in the regulation point, making BZX384-C75-QX unsuitable for applications requiring tight absolute voltage accuracy. It is appropriate for overvoltage protection where upper-bound clamping is prioritized over precise setpoint control, such as safeguarding 80 V-rated components.
Can the BZX384-C75-QX be used in parallel for higher power handling?
No - Zener diodes should not be paralleled due to mismatched breakdown voltages causing current hogging and thermal instability. For higher power needs, select a single higher-rated device like the PZM3.3NB or use active regulation with a transistor-based shunt amplifier, which provides better current sharing and thermal management.
BZX384-C75-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):
- 74.5 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 255 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 52.15 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-C75-QX FAQ
1.How can I place an order for BZX384-C75-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-C75-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-C75-QX reliable?
The price and inventory of BZX384-C75-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-C75-QX is usually 5 days.
3.What payment methods are accepted for BZX384-C75-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-C75-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-C75-QX?
BZX384-C75-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-C75-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-C75-QX?
For technical support, including BZX384-C75-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-C75-QX requirements.
6.How does Aetrix verify that BZX384-C75-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-C75-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-C75-QX meets industry standards.
7.What is the process for return or replacement of BZX384-C75-QX?
All BZX384-C75-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-C75-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-C75-QX part is unused and in its original packaging.
Return procedure for BZX384-C75-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-C75-QX Tags
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