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Nexperia USA Inc. BZX384-B75-QX
- Part No.:
- BZX384-B75-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B75-QX.pdf
- Description:
- DIODE ZENER 75V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,423
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Product details
Overview
BZX384-B75-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 75 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 supply regulation and overvoltage protection circuits.
For engineers reviewing the BZX384-B75-QX datasheet, BZX384-B75-QX pinout, BZX384-B75-QX application, or BZX384-B75-QX equivalent, key selection criteria include its 75 V Zener voltage tolerance, thermal resistance (Rth(j-a) = 415 K/W), non-repetitive peak reverse power (40 W), and automotive qualification status.
Technical Context
This Zener diode operates in reverse-bias breakdown mode with a specified VZ = 73.5 V to 76.5 V at IZ = 2 mA, differential resistance ≤500 Ω, and temperature coefficient of +0.05 mV/K. Its low capacitance (≤88.6 pF at 1 MHz, VR = 0 V) supports stable performance in noise-sensitive analog references.
Designed for surface-mount assembly on FR4 PCBs with standard SOD323 footprint, it sustains non-repetitive surge currents up to 0.20 A (100 μs square wave) and operates across –65 °C to +150 °C ambient range, meeting automotive-grade reliability requirements per AEC-Q101.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 73.5 V to 76.5 V at IZ = 2 mA - defines precise regulation threshold for 75 V nominal systems |
| Tolerance | ±2 % - ensures tight voltage accuracy without trimming in production designs |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Differential Resistance | ≤500 Ω - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | ≤255 μA at VR = 70 V - quantifies leakage below breakdown, critical for low-power standby circuits |
| Non-repetitive Peak Reverse Power | 40 W - enables transient overvoltage clamping (e.g., ISO 7637-2 pulses) without failure |
| Junction Temperature | 150 °C max - defines upper thermal limit for sustained operation in under-hood environments |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 2.7 mm × 1.6 mm body, 0.45 mm nominal height, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity marker (bar) identifies this terminal on device top |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics |
| Low thermal resistance to solder point | Rth(j-sp) = 110 K/W - improves heat transfer to PCB copper, supporting higher pulse reliability |
| Stable temperature coefficient | +0.05 mV/K - minimizes drift over –40 °C to +125 °C operating range in automotive cabins |
| Small-footprint SMD packaging | SOD323 outline (2.7 × 1.6 mm) - enables high-density layout in space-constrained ECUs and ADAS modules |
| Controlled Zener impedance | rdif ≤ 500 Ω - ensures predictable regulation error under varying load currents |
Applications
| Automotive ECU Power Rail Clamping | Industrial Sensor Reference Supply |
|---|---|
Use Scenario: Protecting microcontroller I/O rails against load-dump transients in 24 V vehicle systems. IC Role / Device Role / Timing Role: Zener clamp placed between 24 V supply and ground, conducting during >75 V surges to limit voltage seen by downstream regulators. Use Value: Withstands 40 W non-repetitive pulses (100 μs), enabling compliance with ISO 7637-2 Pulse 5a without external TVS diodes. |
Use Scenario: Providing stable 75 V bias for high-voltage op-amp input stages in precision current-sense amplifiers. IC Role / Device Role / Timing Role: Voltage reference element in feedback network of isolated DC-DC converter secondary-side regulation loop. Use Value: ±2 % tolerance and +0.05 mV/K TC ensure <±0.5 % total error over –40 °C to +85 °C, meeting industrial grade accuracy. |
| Medical Equipment Overvoltage Protection | Telecom Line Interface Voltage Limiting |
Use Scenario: Safeguarding analog front-end inputs in portable ultrasound devices exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Primary clamping device shunting transient energy to ground before signal conditioning circuitry. Use Value: Low 88.6 pF capacitance avoids signal distortion in 1–10 MHz ultrasound receive paths while delivering 0.20 A surge current capability. |
Use Scenario: Limiting ring voltage excursions on POTS line interface cards in VoIP gateways. IC Role / Device Role / Timing Role: Standby-mode Zener regulator holding line voltage within safe range during off-hook detection and ringing. Use Value: 300 mW continuous rating supports long-duration 75 V AC ringing (1–2 s), and AEC-Q101 qualification ensures field reliability in telecom infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C75-Q | ±5 % tolerance (70–79 V range), higher IR (255 μA), same package and surge rating | Acceptable where cost-driven designs tolerate wider voltage spread and higher leakage | Select when absolute regulation accuracy is secondary to BOM cost reduction |
| MMSZ5265B-TP | 75 V nominal, ±5 %, SOD-123 package, 500 mW rating, no AEC-Q101 qualification | Higher power but lacks automotive qualification; larger footprint (3.7 × 1.6 mm) | Choose only for non-automotive industrial use requiring higher continuous dissipation |
Compared with BZX384-C75-Q, the BZX384-B75-QX offers tighter voltage control and lower leakage for precision references; versus MMSZ5265B-TP, it trades power margin for automotive qualification and smaller board area-critical for ECU miniaturization.
Availability
BZX384-B75-QX is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, medical diagnostic equipment, and telecom line interface modules requiring stable component supply with full traceability and lifecycle support.
Supply support for BZX384-B75-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 advanced packaging technologies.
The BZX384-Q series belongs to Nexperia's automotive-grade Zener diode product line, engineered specifically for robust voltage regulation and transient suppression in harsh-environment electronic systems.
FAQ
What is the maximum continuous forward current for BZX384-B75-QX?
The device is not intended for forward conduction; its absolute maximum forward current is 250 mA per limiting values table, but typical operation occurs in reverse-bias breakdown. Forward voltage is 0.9 V at 10 mA, rising to 1.1 V at 100 mA-use only for brief testing or fault conditions.
Can BZX384-B75-QX replace older BZX384-B75 variants without design changes?
Yes-the "-QX" suffix denotes the same electrical and mechanical specifications as the base BZX384-B75-Q, with identical SOD323 package, pinout, Zener characteristics, and AEC-Q101 qualification. No layout or schematic modifications are required for drop-in replacement.
How does the ±2 % tolerance affect regulation accuracy in a 75 V reference circuit?
At 25 °C and IZ = 2 mA, the actual VZ falls between 73.5 V and 76.5 V. Combined with temperature coefficient (+0.05 mV/K), total variation remains within ±2.5 % over –40 °C to +125 °C-sufficient for non-critical biasing and clamping where ±2 V margin is acceptable.
Is thermal derating required above 25 °C ambient temperature?
Yes-total power dissipation must be linearly reduced above 25 °C using Rth(j-a) = 415 K/W. For example, at 85 °C ambient, maximum allowable Ptot = 300 mW × (1 − (85 − 25)/415) ≈ 156 mW to maintain Tj ≤ 150 °C on standard FR4 PCB.
BZX384-B75-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):
- 75 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 255 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 52.5 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-B75-QX FAQ
1.How can I place an order for BZX384-B75-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B75-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-B75-QX reliable?
The price and inventory of BZX384-B75-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-B75-QX is usually 5 days.
3.What payment methods are accepted for BZX384-B75-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B75-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B75-QX?
BZX384-B75-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B75-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-B75-QX?
For technical support, including BZX384-B75-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B75-QX requirements.
6.How does Aetrix verify that BZX384-B75-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-B75-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-B75-QX meets industry standards.
7.What is the process for return or replacement of BZX384-B75-QX?
All BZX384-B75-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B75-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-B75-QX part is unused and in its original packaging.
Return procedure for BZX384-B75-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B75-QX Tags
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