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Nexperia USA Inc. BZX38450-B36-QX
- Part No.:
- BZX38450-B36-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B36-QX.pdf
- Description:
- DIODE ZENER 36V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:8,299
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Product details
Overview
BZX38450-B36-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 36 V nominal working voltage at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-B36-QX datasheet, BZX38450-B36-QX pinout, BZX38450-B36-QX application, or BZX38450-B36-QX equivalent, this device is selected for precision low-bias voltage reference, battery-powered sensor biasing, and automotive ECU voltage clamping where stable 36 V regulation at microamp-level currents is required.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified nominal Zener voltage of 36 V at IZ = 50 µA, exhibiting a differential resistance of 350 Ω at IZ = 5 mA and a temperature coefficient of +0.05 mV/K. Its low test current enables minimal quiescent power draw in always-on circuits.
Designed for automotive-grade reliability, it supports junction temperatures up to 150 °C and features intentional leakage optimization per AN90031 for fast switching and reduced noise-critical in CAN bus interface protection and microcontroller reset supervision circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 35.3 V to 36.7 V at IZ = 50 µA - tight ±2 % tolerance ensures predictable clamping in safety-critical voltage monitoring |
| Differential Resistance (rdiff) | 350 Ω max at IZ = 5 mA - defines regulation stiffness under small-signal load variation |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - enables low-loss anode-cathode conduction during forward bias events |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous thermal load without heatsinking |
| Junction Temperature (Tj) | −55 °C to +150 °C - validated operating range for under-hood automotive environments |
| Reverse Current (IR) | ≤ 0.05 µA at VR = 27.3 V - ultra-low leakage preserves battery life in standby modes |
| Thermal Resistance (Rth(j-a)) | 415 K/W in free air - determines self-heating rise per watt under ambient conditions |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package: 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs at 36 V |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensors |
| Low test current (50 µA) | Enables use in micropower systems such as coin-cell–powered telematics modules |
| ±2 % voltage tolerance | Reduces need for post-production trimming in precision reference designs |
| Optimized leakage profile | Minimizes switching transients and broadband noise in high-speed digital interface protection |
| Small SOD323 footprint | Supports high-density PCB layouts in space-constrained automotive ECUs and wearables |
Applications
| Automotive ECU Voltage Clamping | Portable Sensor Bias Reference |
|---|---|
|
Use Scenario: Protecting microcontroller I/O pins and ADC inputs from transient overvoltage in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Zener clamp placed between signal line and ground to shunt surges above 36 V while remaining inert below threshold. Use Value: Prevents latch-up and permanent damage during load-dump events without loading the signal path in normal operation. |
Use Scenario: Providing stable bias voltage for MEMS pressure sensors powered by lithium-thionyl chloride batteries. IC Role / Device Role / Timing Role: Passive voltage reference establishing fixed operating point for sensor excitation circuitry. Use Value: Maintains sensor accuracy across 10-year shelf life due to sub-50 nA leakage and negligible drift at microamp bias. |
| Industrial PLC Input Protection | USB-C PD Communication Line Clamp |
|
Use Scenario: Safeguarding 24 V DC input channels against field-wiring faults and inductive kickback in factory automation controllers. IC Role / Device Role / Timing Role: Reverse-biased Zener connected across input terminals to clamp transients before they reach isolation amplifiers. Use Value: Survives repeated 1 kV/µs surge events per IEC 61000-4-5 while maintaining <1 % regulation error at 100 µA bias. |
Use Scenario: Limiting voltage on CC1/CC2 configuration channel lines in USB-C power delivery negotiation circuits. IC Role / Device Role / Timing Role: Fast-response clamp absorbing ESD pulses and hot-plug overshoot without distorting PD protocol signaling. Use Value: Meets IEC 61000-4-2 Level 4 (15 kV air, 8 kV contact) while preserving signal integrity up to 300 kHz communication rate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C36-Q | ±5 % tolerance, higher leakage (0.1 µA), same SOD323 package and 36 V nominal rating | Acceptable for non-critical biasing where cost sensitivity outweighs precision | Select when budget constraints dominate and ±5 % regulation error is permissible |
| MMSZ5245B-TP | 36 V nominal, ±5 %, 500 mW Ptot, SOD-123 package (larger footprint, higher thermal mass) | Better power handling but incompatible with ultra-dense SOD323 layouts | Choose only if board layout allows SOD-123 and >300 mW surge margin is required |
Compared with BZX38450-B36-QX, the BZX384-C36-Q trades precision for cost in identical form factor, while MMSZ5245B-TP offers higher power rating at the expense of PCB area and automotive qualification-making the BZX38450-B36-QX optimal for space-constrained, AEC-Q101–mandated 36 V reference designs.
Availability
BZX38450-B36-QX is available at Aetrix Electronics and suitable for automotive ECU design, portable sensor module development, and industrial PLC input protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX38450-B36-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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BZX38450-Q series belongs to Nexperia's AEC-Q101–qualified Zener diode portfolio, engineered specifically for low-current, high-stability voltage regulation in harsh-environment automotive electronics and battery-constrained IoT endpoints.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX38450-B36-QX has a nominal Zener voltage of 36 V, with guaranteed breakdown occurring between 35.3 V and 36.7 V at 50 µA test current. It is not rated for sustained reverse voltage above its specified VZ range; operation beyond 36.7 V risks thermal runaway unless current is strictly limited by external series resistance.
Does this part support reflow soldering, and what profile is recommended?
Yes, the SOD323 package is qualified for lead-free reflow soldering. Nexperia specifies a peak temperature of 260 °C for ≤ 30 seconds, with ramp-up rate ≤ 3 °C/s and ramp-down rate ≤ 6 °C/s. The recommended footprint matches Figure 10 in the datasheet: 0.6 mm solder land width, 0.5 mm solder paste stencil aperture, and 1.35 mm center-to-center pitch.
How does the "B" suffix differ from "C" in the BZX38450-Q series?
The "B" suffix denotes ±2 % tolerance on Zener voltage, while "C" indicates approximately ±5 % tolerance. Both share identical package, thermal characteristics, and AEC-Q101 qualification, but "B" grade provides tighter regulation for precision reference applications where voltage stability directly impacts system accuracy.
Can this diode be used in parallel for higher power handling?
No-Zener diodes exhibit negative temperature coefficients and manufacturing variations that cause current hogging when paralleled. Even matched units will not share current evenly, risking thermal runaway in one device. For higher power, select a single higher-rated Zener or implement active regulation instead.
BZX38450-B36-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 36 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-B36-QX FAQ
1.How can I place an order for BZX38450-B36-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B36-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 BZX38450-B36-QX reliable?
The price and inventory of BZX38450-B36-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B36-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B36-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B36-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B36-QX?
BZX38450-B36-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B36-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 BZX38450-B36-QX?
For technical support, including BZX38450-B36-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B36-QX requirements.
6.How does Aetrix verify that BZX38450-B36-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B36-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 BZX38450-B36-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B36-QX?
All BZX38450-B36-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B36-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 BZX38450-B36-QX part is unused and in its original packaging.
Return procedure for BZX38450-B36-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B36-QX 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
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