My Inquiry
My Account
Nexperia USA Inc. BZX384-A75X
- Part No.:
- BZX384-A75X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A75X.pdf
- Description:
- DIODE ZENER 75V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,648
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX384-A75X from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 75 V nominal breakdown voltage at 2 mA, 300 mW total power dissipation, and 150 °C maximum junction temperature. It provides precision voltage reference and overvoltage protection in low-power analog and digital supply rails.
For engineers reviewing the BZX384-A75X datasheet, BZX384-A75X pinout, BZX384-A75X application, or BZX384-A75X equivalent, this page delivers verified electrical parameters, thermal behavior, cathode/anode terminal mapping, real-world regulation use cases, and validated alternative parts with documented tolerance and voltage differences.
Technical Context
This discrete Zener diode operates in reverse-bias breakdown mode to maintain stable DC voltage across its terminals under varying load and input conditions. Its 75 V nominal Zener voltage is specified at IZ = 2 mA with ±1 % tolerance, and exhibits a positive temperature coefficient of +52.5 mV/K at that current.
The device features low differential resistance (500 Ω max), reverse leakage <1 μA at VR = 60 V, and non-repetitive peak reverse power capability of 40 W for 100 μs pulses. Thermal resistance from junction to ambient is 415 K/W on standard FR4 PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 74.25 V to 75.75 V at IZ = 2 mA - ensures tight regulation within ±1 % for precision reference applications |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - defines continuous DC power handling on standard FR4 PCB |
| Differential Resistance (rdif) | ≤500 Ω at IZ = 2 mA - determines output impedance and regulation sensitivity to current changes |
| Reverse Leakage (IR) | <1 μA at VR = 60 V - guarantees minimal standby current in high-impedance bias networks |
| Temperature Coefficient (SZ) | +52.5 mV/K at IZ = 2 mA - quantifies voltage drift per degree Celsius for thermal stability analysis |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - supports transient overvoltage clamping without failure |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA - defines forward conduction loss when used in series polarity configurations |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 2.7 mm × 1.6 mm footprint, 0.45 mm profile height, and cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; accepts reverse-bias current during Zener operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for voltage reference |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % Zener voltage tolerance | Enables high-accuracy voltage references without post-calibration in sensor biasing and ADC reference circuits |
| 300 mW power rating in SOD323 | Supports compact board layout while delivering sufficient regulation headroom for 5–10 mA load currents |
| Low thermal resistance (110 K/W to solder point) | Improves power derating margin and reliability in thermally constrained layouts near heat sources |
| Cathode-bar marking | Ensures unambiguous polarity identification during automated optical inspection (AOI) and manual rework |
| Non-repetitive 40 W surge capability | Provides robust ESD and transient immunity in I/O protection circuits without external TVS stacking |
Applications
| Industrial Sensor Biasing | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Providing stable 75 V reference for high-voltage current-sense amplifier bias in motor drive feedback loops. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference, setting common-mode input level for isolated amplifiers. Use Value: ±1 % tolerance ensures <±0.75 V absolute error in bias point, maintaining amplifier linearity across temperature. |
Use Scenario: Generating clean reset threshold for 3.3 V microcontrollers interfacing with 75 V auxiliary power monitoring. IC Role / Device Role / Timing Role: Functions as precision voltage divider element in RC reset generator network. Use Value: Low 1 μA leakage prevents premature discharge of timing capacitor, ensuring reliable reset pulse width. |
| Programmable Logic Supply Clamp | High-Voltage Analog Front-End Protection |
|
Use Scenario: Clamping FPGA I/O bank supply rail against 75 V transients induced by relay coil back-EMF. IC Role / Device Role / Timing Role: Shunt regulator limits rail voltage during fast transients, protecting IO structures. Use Value: 40 W non-repetitive surge rating absorbs 100 μs spikes without degradation, eliminating need for secondary TVS. |
Use Scenario: Stabilizing reference voltage for 16-bit SAR ADC measuring 0–75 V battery strings in energy storage systems. IC Role / Device Role / Timing Role: Supplies low-noise, temperature-compensated reference to ADC internal reference buffer. Use Value: +52.5 mV/K coefficient allows predictable compensation in firmware, reducing calibration points by 40 %. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B75 | ±2 % tolerance (73.5 V–76.5 V), identical package and power rating | Acceptable where ±2 % regulation accuracy suffices, e.g., non-critical supply supervision | Select for cost-sensitive designs where tighter tolerance is unnecessary and BOM simplification is prioritized |
| MMSZ5265B | 75 V nominal, ±5 % tolerance, SOD-123 package, 500 mW rating | Higher power but larger footprint; higher leakage (>5 μA at 60 V) | Choose only if 500 mW continuous dissipation is required and board space permits larger SOD-123 placement |
Compared with BZX384-A75X, BZX384-B75 trades ±1 % accuracy for broader tolerance at identical size and cost, while MMSZ5265B offers higher power but sacrifices leakage performance and board density-making the A75X optimal for space-constrained, precision-biased analog systems.
Availability
BZX384-A75X is available at Aetrix Electronics and suitable for industrial sensor biasing, microcontroller reset circuits, programmable logic supply clamping, and high-voltage analog front-end protection requiring stable component supply and traceable sourcing.
Supply support for BZX384-A75X 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 and industrial-grade components.
The BZX384 series belongs to Nexperia's precision Zener regulator portfolio, engineered for stable voltage reference and overvoltage protection in space-constrained, low-power industrial and consumer electronics.
FAQ
What is the maximum continuous reverse current for BZX384-A75X at 25 °C ambient?
The device is rated for 250 mA maximum forward current, but continuous reverse (Zener) current is limited by power dissipation. At 25 °C ambient and 300 mW Ptot, the maximum sustainable Zener current is 4 mA (300 mW ÷ 75 V). Derating applies above 25 °C per the 415 K/W thermal resistance.
Can BZX384-A75X be used in series with another Zener to achieve higher voltage?
Yes, but with caution: series connection increases total dynamic impedance and temperature coefficient uncertainty. The combined VZ will be sum of individual voltages, but mismatched coefficients cause nonlinear drift. For 150 V reference, two BZX384-A75X units may be used only if matched within ±0.1 % and thermally coupled.
Is BZX384-A75X qualified for automotive applications?
No. Per Nexperia's Rev. 4 datasheet (January 2023), the BZX384 series is explicitly designated as non-automotive qualified. Automotive alternatives are available under the -Q suffix (e.g., BZX384-A75-Q) with AEC-Q200 qualification, extended temperature range, and enhanced process controls.
How does the cathode-bar marking align with the SOD323 package outline?
The marking bar is located adjacent to Pin 1 (cathode) on the top surface of the SOD323 package, aligned parallel to the long edge. As shown in Figure 11 of the datasheet, the bar sits over the cathode die bond pad area, directly above the leadframe tab connected to Terminal 1, enabling unambiguous visual and AOI-based orientation verification.
BZX384-A75X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 75 V
- Tolerance:
- ±1%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 175 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-A75X FAQ
1.How can I place an order for BZX384-A75X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A75X 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-A75X reliable?
The price and inventory of BZX384-A75X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-A75X is usually 5 days.
3.What payment methods are accepted for BZX384-A75X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A75X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A75X?
BZX384-A75X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A75X 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-A75X?
For technical support, including BZX384-A75X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A75X requirements.
6.How does Aetrix verify that BZX384-A75X is sourced from the original manufacturer or authorized distributors?
All BZX384-A75X 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-A75X meets industry standards.
7.What is the process for return or replacement of BZX384-A75X?
All BZX384-A75X units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A75X, 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-A75X part is unused and in its original packaging.
Return procedure for BZX384-A75X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-A75X Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
