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Nexperia USA Inc. BZX38450-C68-QX
- Part No.:
- BZX38450-C68-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C68-QX.pdf
- Description:
- DIODE ZENER 68V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,458
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Product details
Overview
BZX38450-C68-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision biasing and voltage reference in space-constrained, low-power circuits. It delivers a nominal 68 V regulation at 50 µA test current, with ±5 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-C68-QX datasheet, BZX38450-C68-QX pinout, BZX38450-C68-QX application, or BZX38450-C68-QX equivalent, key selection criteria include its low-test-current operation (50 µA), intentional leakage optimization for noise reduction, thermal resistance (Rth(j-a) = 415 K/W), and automotive-grade reliability under −55 °C to +150 °C ambient conditions.
Technical Context
This Zener diode operates in reverse breakdown with a specified working voltage of 68 V at IZ = 50 µA, exhibiting a temperature coefficient of +3.8 mV/K and differential resistance of ≤ 400 Ω at IZ = 2 mA. Its design targets stable voltage reference generation under minimal bias current, avoiding thermal drift issues common in higher-current regulators.
The device features optimized leakage current per AN90031 to reduce switching noise and improve transient response in low-power analog signal chains. Its SOD323 footprint enables high-density PCB layouts while maintaining thermal performance via Rth(j-sp) = 110 K/W to the cathode solder point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VZ) | 68 V nominal at IZ = 50 µA - sets precise reference point for low-bias circuits |
| Tolerance | ±5 % - defines regulation accuracy band for system-level voltage margining |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - limits thermal rise on standard FR4 PCBs |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - ensures low conduction loss during forward bias |
| Junction Temperature | −55 °C to +150 °C - supports operation in under-hood automotive environments |
| Reverse Current (IR) | ≤ 0.05 µA at VR = 68 V - guarantees low standby leakage in battery-powered systems |
| Thermal Resistance (j-a) | 415 K/W - determines junction-to-ambient temperature rise under steady-state load |
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 marker aligns with PCB silkscreen bar |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 µA - enables stable reference in micro-power sensor interfaces and RTC backup circuits |
| AEC-Q101 qualification | Qualified for automotive applications - meets stress test requirements for discrete semiconductors in harsh environments |
| Optimized leakage profile | Intentional minor leakage rise per AN90031 - reduces switching noise and improves transient response in feedback paths |
| Small-outline packaging | SOD323 footprint - supports high-density routing in compact modules like ADAS camera ECUs and infotainment power rails |
Applications
| Automotive Sensor Biasing | Portable Instrument Reference |
|---|---|
Use Scenario: Providing stable bias voltage to MEMS pressure sensors in engine control units. IC Role / Device Role / Timing Role: Zener voltage reference for ADC input scaling and op-amp offset compensation. Use Value: ±5 % tolerance and −55 °C to +150 °C operation ensure consistent sensor calibration across full vehicle temperature range. |
Use Scenario: Generating precision reference for handheld multimeter front-end analog circuitry. IC Role / Device Role / Timing Role: Low-current voltage reference enabling battery life extension without sacrificing measurement accuracy. Use Value: 50 µA test current minimizes quiescent drain on coin-cell batteries while maintaining 68 V reference stability. |
| Industrial PLC Input Protection | Medical Device Power Sequencing |
Use Scenario: Clamping and regulating auxiliary supply rails in programmable logic controller I/O modules. IC Role / Device Role / Timing Role: Overvoltage protection and rail stabilization for isolated 24 V digital inputs. Use Value: 300 mW dissipation and 415 K/W thermal resistance allow reliable operation without heatsinking on standard PCBs. |
Use Scenario: Establishing controlled startup voltage thresholds in portable ultrasound probe power management. IC Role / Device Role / Timing Role: Precision voltage threshold detector for sequencing critical analog subsystems. Use Value: +3.8 mV/K temperature coefficient enables predictable trip-point drift over clinical operating temperatures (0–40 °C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX38450-B68-Q | Nominal 68 V at ±2 % tolerance; lower leakage than C-series; no intentional leakage optimization | Better DC accuracy but higher switching noise in dynamic references | Select when absolute voltage precision outweighs noise sensitivity |
| MMBZ5268B-7-F | 68 V, ±5 %, SOT-23 package; 225 mW Ptot; Rth(j-a) = 450 K/W; not AEC-Q101 qualified | Limited to industrial/commercial use; larger footprint and lower power rating | Choose only for non-automotive designs where cost or legacy footprint compatibility drives selection |
Compared with BZX38450-C68-QX, the BZX38450-B68-Q offers tighter tolerance but lacks noise-optimized leakage, while MMBZ5268B-7-F trades automotive qualification and thermal performance for broader distributor availability in non-automotive contexts.
Availability
BZX38450-C68-QX is available at Aetrix Electronics and suitable for automotive sensor biasing, portable instrument reference, and industrial PLC input protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX38450-C68-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 specializing in high-performance, 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-grade Zener regulator portfolio, engineered specifically for low-current, low-noise voltage reference and biasing in safety-critical and thermally demanding environments.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX38450-C68-QX has a nominal Zener voltage of 68 V at 50 µA test current, with a guaranteed minimum breakdown voltage of 64.6 V and maximum of 71.4 V (±5 %). Its non-repetitive peak reverse power dissipation is rated at 40 W for 100 µs pulses, but continuous operation must remain within the 300 mW total power limit at ambient ≤25 °C.
Does this part require external current limiting in series?
Yes - a series current-limiting resistor is mandatory to prevent thermal runaway. For example, at 75 V supply and 68 V regulation, a 1 kΩ resistor limits current to ~7 mA, staying well below the 250 mA absolute maximum forward current and within safe power dissipation limits. The resistor value must be calculated based on worst-case supply variation and desired Zener current.
How does the "C" suffix differ from "B" in the BZX38450-Q series?
The "C" suffix denotes ±5 % tolerance and incorporates an intentional, controlled increase in leakage current per AN90031 to improve switching speed and reduce noise in dynamic reference applications. In contrast, "B" parts offer ±2 % tolerance and conventional leakage behavior, prioritizing DC accuracy over transient performance.
Can this diode be used in parallel for higher power handling?
No - Zener diodes exhibit manufacturing variations in breakdown voltage that cause current hogging when paralleled, leading to thermal instability and premature failure. To increase power capability, use a single higher-rated device or implement active regulation with a pass transistor; never parallel BZX38450-C68-QX units without individual ballasting resistors and thermal derating.
BZX38450-C68-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 68 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 240 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 47.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-C68-QX FAQ
1.How can I place an order for BZX38450-C68-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C68-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-C68-QX reliable?
The price and inventory of BZX38450-C68-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-C68-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-C68-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C68-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C68-QX?
BZX38450-C68-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C68-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-C68-QX?
For technical support, including BZX38450-C68-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C68-QX requirements.
6.How does Aetrix verify that BZX38450-C68-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-C68-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-C68-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-C68-QX?
All BZX38450-C68-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C68-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-C68-QX part is unused and in its original packaging.
Return procedure for BZX38450-C68-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C68-QX Tags
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