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Nexperia USA Inc. BZX38450-C68-QF
- Part No.:
- BZX38450-C68-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C68-QF.pdf
- Description:
- DIODE ZENER 68V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,926
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Product details
Overview
BZX38450-C68-QF from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 68 V nominal Zener voltage 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-QF datasheet, BZX38450-C68-QF pinout, BZX38450-C68-QF application, or BZX38450-C68-QF equivalent, this device serves as a precision low-bias voltage reference in battery-powered sensor interfaces, ECU voltage monitoring circuits, and automotive infotainment power rail clamping.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified VZ = 68 V (min 64.6 V, max 71.4 V) at IZ = 50 µA, exhibiting a temperature coefficient of +5.7 mV/K and differential resistance of 400 Ω at IZ = 2 mA. Its low test current enables stable regulation in micro-power systems where bias current must remain below 100 µA.
The device features intentional leakage optimization per AN90031 for reduced noise and faster transient response in signal conditioning paths. It is qualified to AEC-Q101 with Tj up to 150 °C and operates across −55 °C to +150 °C ambient, mounted on FR4 PCB with standard SOD323 footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V nominal at 50 µA; min 64.6 V / max 71.4 V - defines precise clamping threshold in overvoltage protection |
| Tolerance | ±5 % - supports cost-sensitive automotive designs where tighter tolerance is not required |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - limits thermal rise on standard FR4 PCB without heatsinking |
| Forward Voltage (VF) | ≤ 0.9 V at 10 mA - ensures low conduction loss when used bidirectionally or in series with logic |
| Differential Resistance (rdiff) | 400 Ω at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Temperature Coefficient (SZ) | +5.7 mV/K - quantifies VZ drift over temperature; positive slope aids thermal stability in stacked configurations |
| Junction-to-Ambient Rth | 415 K/W - confirms need for minimal copper area in thermally constrained layouts |
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 (K) | Cathode | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 (A) | Anode | Connected to ground or lower-potential rail; reverse-biased configuration enables Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 µA - enables use in nanoampere-bias sensor front-ends and energy-harvesting circuits |
| AEC-Q101 qualification | Qualified for automotive applications - supports deployment in engine control units, ADAS sensors, and body electronics without additional reliability screening |
| Optimized leakage profile | Intentional minor leakage rise per AN90031 - reduces high-frequency noise and improves switching transients in feedback loops |
| Small-footprint SOD323 | 1.7 mm × 1.25 mm outline - saves board space in dense automotive modules and portable instrumentation |
Applications
| Automotive ECU Voltage Monitoring | Portable Gas Sensor Biasing |
|---|---|
Use Scenario: Monitoring 12 V battery rail in engine control unit to detect overvoltage events above 15 V. IC Role / Device Role / Timing Role: Zener clamp referenced to microcontroller ADC input, providing fault detection threshold. Use Value: 68 V rating allows safe margin above 12 V system with surge tolerance; ±5 % tolerance aligns with automotive diagnostic thresholds. |
Use Scenario: Providing stable 68 V bias to electrochemical gas sensor requiring high-voltage excitation. IC Role / Device Role / Timing Role: Low-current Zener reference generating fixed bias voltage from 3.3 V LDO via resistive divider and op-amp boost stage. Use Value: 50 µA test current minimizes quiescent draw in battery-operated handheld detectors; SOD323 footprint fits compact sensor PCB. |
| Infotainment Power Rail Clamping | Industrial PLC Input Protection |
Use Scenario: Protecting HDMI PHY supply rail against load-dump transients in automotive infotainment head units. IC Role / Device Role / Timing Role: Shunt regulator placed between 5 V rail and ground, clamping spikes exceeding 68 V to prevent IC damage. Use Value: 300 mW Ptot handles short-duration surges; AEC-Q101 qualification ensures reliability under vehicle vibration and thermal cycling. |
Use Scenario: Guarding 24 V digital input channel in programmable logic controller against field-wiring induced transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp in input protection network, paired with series resistor and TVS diode. Use Value: +5.7 mV/K temperature coefficient compensates for ambient drift in factory-floor environments; 400 Ω rdiff maintains accuracy under varying load currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX38450-B68-Q | Same package and VZ, but ±2 % tolerance (tighter), higher rdiff (350 Ω), and no intentional leakage optimization | Preferred where precision voltage reference is critical, e.g., calibration circuits; unsuitable where low-noise fast switching is required | Select B68-Q only if ±2 % tolerance justifies cost premium and leakage behavior is verified compatible |
| MMSZ5268ET1G | 68 V nominal, ±5 %, SOD-123 package (larger: 2.7 mm × 1.6 mm), 500 mW Ptot, rdiff = 130 Ω at 20 mA | Better power handling and lower impedance, but lacks AEC-Q101 qualification and SOD323 space efficiency | Choose MMSZ5268ET1G only for non-automotive industrial use requiring higher surge capability and lower dynamic impedance |
Compared with BZX38450-B68-Q, the C68-Q trades tolerance for optimized noise and switching; versus MMSZ5268ET1G, it sacrifices power rating and rdiff for automotive qualification and 30 % smaller footprint - making it the sole choice for space-constrained AEC-Q101-compliant 68 V clamping.
Availability
BZX38450-C68-QF is available at Aetrix Electronics and suitable for automotive ECU monitoring, portable sensor biasing, and infotainment rail clamping requiring stable component supply across production lifecycles.
Supply support for BZX38450-C68-QF 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, logic, and MOSFET solutions 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, low-noise voltage regulation in automotive electronics and portable instrumentation.
FAQ
What is the maximum reverse current (IR) at 68 V for BZX38450-C68-QF?
At VR = 68 V and Tj = 25 °C, the typical reverse current is ≤ 0.05 µA, per Table 9. This ultra-low leakage ensures minimal standby power loss in always-on automotive modules and extends battery life in portable devices using this diode as a reference.
Can BZX38450-C68-QF be used in parallel for higher power handling?
No - Zener diodes exhibit manufacturing spread in VZ, causing current imbalance and thermal runaway when paralleled. The datasheet specifies single-device operation only; for higher power, use a single higher-rated Zener or external current-sharing circuitry with matched devices and ballast resistors.
Is the SOD323 package suitable for reflow soldering per JEDEC J-STD-020?
Yes - Nexperia qualifies the SOD323 package for standard lead-free reflow per JEDEC J-STD-020D, with peak temperature up to 260 °C. Figure 10 provides the recommended solder land pattern, and thermal resistance data (Rth(j-sp) = 110 K/W) confirms robust thermal transfer during reflow.
How does the +5.7 mV/K temperature coefficient affect long-term voltage stability?
The +5.7 mV/K coefficient means VZ increases ~385 mV over a 68 °C junction rise (e.g., from 25 °C to 93 °C). In closed-loop systems, this predictable drift can be compensated in firmware; in open-loop references, it sets the absolute accuracy limit - confirmed in Table 9 for the C68-Q variant.
BZX38450-C68-QF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450
- 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-QF FAQ
1.How can I place an order for BZX38450-C68-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C68-QF 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-QF reliable?
The price and inventory of BZX38450-C68-QF 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-QF is usually 5 days.
3.What payment methods are accepted for BZX38450-C68-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C68-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C68-QF?
BZX38450-C68-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C68-QF 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-QF?
For technical support, including BZX38450-C68-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C68-QF requirements.
6.How does Aetrix verify that BZX38450-C68-QF is sourced from the original manufacturer or authorized distributors?
All BZX38450-C68-QF 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-QF meets industry standards.
7.What is the process for return or replacement of BZX38450-C68-QF?
All BZX38450-C68-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C68-QF, 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-QF part is unused and in its original packaging.
Return procedure for BZX38450-C68-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C68-QF 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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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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