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Nexperia USA Inc. BZX38450-B6V8-QX
- Part No.:
- BZX38450-B6V8-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B6V8-QX.pdf
- Description:
- DIODE ZENER 6.8V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,761
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Product details
Overview
BZX38450-B6V8-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 6.8 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-B6V8-QX datasheet, BZX38450-B6V8-QX pinout, BZX38450-B6V8-QX application, or BZX38450-B6V8-QX equivalent, this page delivers verified electrical characteristics, thermal resistance data, cathode/anode terminal mapping, and automotive-grade reliability context - all confirmed from Nexperia's Rev. 4 product data sheet dated 16 July 2024.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage under low-bias conditions, with specified differential resistance of 80 Ω at 5 mA and temperature coefficient of +1.2 mV/K. Its 50 µA test current enables ultra-low quiescent current regulation ideal for battery-powered sensor nodes and microcontroller reset circuits.
The device features intentional leakage optimization per AN90031 for fast switching and noise reduction, and achieves junction-to-ambient thermal resistance of 415 K/W on FR4 PCB - critical for thermal design in space-constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 6.8 V at IZ = 50 µA - defines precise voltage reference point for low-power biasing |
| Tolerance | ±2 % - ensures tight regulation accuracy for precision analog sensing and ADC reference |
| Differential Resistance (rdiff) | 80 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA - defines conduction threshold in forward-biased protection configurations |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - sets maximum continuous power handling on standard FR4 PCB |
| Junction Temperature (Tj) | 150 °C - defines upper thermal limit for sustained operation in engine bay or infotainment modules |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package: 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, marking bar indicates cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity-sensitive terminal for reverse-bias operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes Zener conduction path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables regulation in µA-level standby circuits without loading sensitive sources |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching transients and improves noise immunity in signal conditioning paths |
| Automotive qualification | AEC-Q101 compliant - supports deployment in ADAS camera modules, body control units, and HVAC controllers |
| Thermal performance | Rth(j-a) = 415 K/W - allows accurate junction temperature estimation for derating in sealed enclosures |
| Small footprint | SOD323 package - fits high-density PCB layouts where board space is constrained by RF or safety isolation requirements |
Applications
| Engine Control Unit (ECU) Sensor Biasing | Automotive Infotainment Power Sequencing |
|---|---|
Use Scenario: Providing stable 6.8 V reference to analog front-end of oxygen sensor interface circuitry in engine management systems. IC Role / Device Role / Timing Role: Zener voltage reference diode regulating bias voltage for op-amp input stages and ADC reference dividers. Use Value: ±2 % tolerance and +1.2 mV/K temperature coefficient ensure <±15 mV drift over −40 °C to +125 °C ambient, meeting ASIL-B sensor accuracy requirements. |
Use Scenario: Enabling controlled power-up sequencing of display backlight drivers and audio codecs in head unit mainboard. IC Role / Device Role / Timing Role: Low-current Zener clamp establishing clean reset threshold for supervisor ICs during cold-cranking events. Use Value: 50 µA test current minimizes standby current draw while maintaining fast response to voltage sags below 6.8 V. |
| ADAS Camera Module Voltage Reference | Body Control Module (BCM) Reset Circuit |
Use Scenario: Generating precise 6.8 V reference for image sensor analog supply rails in surround-view camera ECUs. IC Role / Device Role / Timing Role: Precision Zener regulator stabilizing LDO feedback network to suppress ripple-induced image noise. Use Value: 80 Ω differential resistance limits output impedance variation across operating current range, preserving PSRR above 60 dB. |
Use Scenario: Implementing brown-out detection for microcontroller reset assertion in door module electronics. IC Role / Device Role / Timing Role: Zener-based comparator input reference ensuring reliable reset activation at 6.8 V ±2 % during battery voltage recovery. Use Value: AEC-Q101 qualification guarantees operation over full automotive temperature range without parametric shift or failure. |
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-C6V8-Q | ±5 % tolerance, higher rdiff (100 Ω), same VZ and package | Acceptable for non-critical biasing where cost sensitivity outweighs accuracy needs | Select when tighter tolerance is unnecessary and BOM cost reduction is prioritized |
| MMSZ5234B-7-F | 6.8 V ±5 %, SOD-123 package, 500 mW Ptot, no AEC-Q101 qualification | Limited to industrial or consumer applications due to lack of automotive qualification | Choose only for non-automotive designs requiring higher power margin and larger footprint tolerance |
Compared with BZX38450-B6V8-QX, the BZX384-C6V8-Q trades accuracy for cost in identical automotive-qualified packaging, while MMSZ5234B-7-F offers higher power but lacks AEC-Q101 validation - making the original part uniquely suited for precision, low-power, automotive-critical Zener functions.
Availability
BZX38450-B6V8-QX is available at Aetrix Electronics and suitable for automotive ECU sensor biasing, ADAS camera reference generation, and BCM reset circuitry requiring stable component supply with guaranteed AEC-Q101 compliance and traceable lot history.
Supply support for BZX38450-B6V8-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 energy-efficient solutions.
The BZX38450-Q series belongs to Nexperia's automotive Zener diode product line, engineered specifically for low-current voltage reference and regulation in harsh-environment automotive electronics where precision, stability, and qualification are mandatory.
FAQ
What is the maximum reverse current (IR) at 6.8 V for BZX38450-B6V8-QX?
At VR = 6.8 V and Tj = 25 °C, the typical reverse current is 5.1 µA. The datasheet specifies a maximum of 5.1 µA under these conditions, confirming minimal leakage at nominal regulation voltage - essential for preserving battery life in always-on automotive modules.
Does BZX38450-B6V8-QX support reflow soldering, and what footprint is recommended?
Yes, it supports standard lead-free reflow soldering. Nexperia recommends the SOD323 reflow footprint shown in Figure 10: 0.5 mm × 0.6 mm solder lands, 0.6 mm solder resist opening, and 2.2 mm overall pad length - optimized for thermal transfer and mechanical reliability on FR4 boards.
How does the temperature coefficient (+1.2 mV/K) affect regulation accuracy over automotive temperature range?
Over −40 °C to +125 °C, the total VZ drift is approximately ±200 mV (165 K × 1.2 mV/K), resulting in a worst-case regulation band of 6.6 V to 7.0 V. This remains within system-level tolerance budgets for non-critical biasing and reset functions in qualified automotive designs.
Is BZX38450-B6V8-QX suitable for use as a transient voltage suppressor (TVS)?
No - it is not designed or rated for surge suppression. With non-repetitive peak reverse power dissipation of only 40 W for 100 µs pulses, it lacks the clamping speed and energy-handling capability of dedicated TVS diodes. Use only for steady-state voltage regulation and reference applications.
BZX38450-B6V8-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):
- 6.8 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 5.1 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-B6V8-QX FAQ
1.How can I place an order for BZX38450-B6V8-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B6V8-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-B6V8-QX reliable?
The price and inventory of BZX38450-B6V8-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-B6V8-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B6V8-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B6V8-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B6V8-QX?
BZX38450-B6V8-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B6V8-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-B6V8-QX?
For technical support, including BZX38450-B6V8-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B6V8-QX requirements.
6.How does Aetrix verify that BZX38450-B6V8-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B6V8-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-B6V8-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B6V8-QX?
All BZX38450-B6V8-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B6V8-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-B6V8-QX part is unused and in its original packaging.
Return procedure for BZX38450-B6V8-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B6V8-QX Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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