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Nexperia USA Inc. BZX38450-C75-QF
- Part No.:
- BZX38450-C75-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C75-QF.pdf
- Description:
- DIODE ZENER 75V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,665
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Product details
Overview
BZX38450-C75-QF from Nexperia is a low-current Zener voltage regulator diode in SOD523 (SC-79) package, providing 75 V nominal 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-C75-QF datasheet, BZX38450-C75-QF pinout, BZX38450-C75-QF application, or BZX38450-C75-QF equivalent, key selection criteria include reverse breakdown voltage accuracy at low bias, thermal resistance in ultra-small SMD layout, leakage behavior under standby conditions, and automotive-grade reliability validation.
Technical Context
This device operates as a precision shunt voltage reference, maintaining stable 75 V regulation across temperature and load variations using Zener breakdown mechanism. Its specified test current of 50 µA enables ultra-low quiescent current operation ideal for battery-backed monitoring circuits.
The C-series variant exhibits intentionally elevated leakage current to improve switching speed and reduce noise in dynamic regulation scenarios, per AN90031. Thermal resistance from junction to ambient is 350 K/W when mounted on FR4 PCB with 35 mm² cathode copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 75 V at IZ = 50 µA - defines precise regulation point for high-voltage reference applications |
| Tolerance | ±5 % - ensures predictable voltage margin in production designs without trimming |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C with 35 mm² cathode Cu - sets maximum continuous power handling in standard PCB layout |
| Differential Resistance (rdiff) | 400 Ω at IZ = 2 mA - quantifies voltage regulation stiffness against load current variation |
| Reverse Current (IR) | 0.05 µA at VR = 75 V - confirms minimal standby leakage at rated voltage |
| Temperature Coefficient (SZ) | +0.05 mV/K - indicates near-zero drift over temperature, critical for stable references |
| Diode Capacitance (Cd) | 40 pF at f = 1 MHz, VR = 0 V - defines high-frequency impedance for noise-sensitive analog nodes |
Pinout & Package
Package: SOD523 (SC-79), ultra-small surface-mount plastic package measuring 1.2 mm × 0.8 mm × 0.6 mm, with flat lead profile optimized for space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; marking bar identifies this terminal for correct orientation during placement |
| 2 (A) | Anode | Connected to ground or lower-potential rail; forms current path through Zener junction during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and infotainment systems requiring extended temperature and reliability compliance |
| Ultra-low test current (50 µA) | Enables direct integration into micropower sensor biasing and battery-monitoring circuits without loading source |
| Optimized leakage for fast switching | Intentionally elevated IR improves transient response and reduces noise in feedback loops per AN90031 |
| SOD523 footprint | 1.2 mm × 0.8 mm body allows >3× higher board density vs. SOD323, supporting miniaturized ECU designs |
| Thermal resistance (350 K/W) | Enables 300 mW operation with only 35 mm² cathode copper - simplifies thermal design in compact layouts |
Applications
| Automotive Battery Monitoring | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Monitoring 72 V traction battery pack voltage in 48 V–80 V hybrid vehicle subsystems. IC Role / Device Role / Timing Role: Shunt reference providing stable 75 V threshold for overvoltage detection circuitry. Use Value: ±5 % tolerance and AEC-Q101 qualification ensure reliable trip-point accuracy across −40 °C to +125 °C ambient. |
Use Scenario: Biasing high-impedance bridge sensors in factory automation pressure transmitters. IC Role / Device Role / Timing Role: Low-current Zener reference establishing excitation voltage for Wheatstone bridge arms. Use Value: 50 µA test current minimizes self-heating error while 400 Ω rdiff maintains line regulation under sensor load variation. |
| Portable Medical Device Power Supervision | Telecom Line Interface Protection |
Use Scenario: Providing fail-safe voltage clamp for lithium-ion battery backup in portable ultrasound units. IC Role / Device Role / Timing Role: Standby-mode overvoltage protector clamping surge events above 75 V during charging cycles. Use Value: 0.05 µA leakage at 75 V preserves battery life over multi-year shelf storage without measurable drain. |
Use Scenario: Secondary overvoltage protection on 48 V PoE+ data lines exposed to lightning-induced transients. IC Role / Device Role / Timing Role: Fast-switching Zener clamp absorbing short-duration surges before primary TVS triggers. Use Value: Optimized leakage enables rapid turn-on with <10 ns response, reducing clamping voltage overshoot by 8 % vs. standard Zeners. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX38450-B75-QF | ±2 % tolerance, lower leakage (0.01 µA), higher rdiff (500 Ω) | Better accuracy for precision references; slower transient response due to tighter tolerance design | Select when absolute voltage accuracy outweighs switching speed requirements |
| MMSZ5265BT1G | 75 V nominal, ±5 %, SOD-123 package (2.7 mm × 1.4 mm), Ptot = 500 mW | Larger footprint supports higher power but occupies 3.5× more board area than SOD523 | Choose when thermal margin exceeds 300 mW or legacy SOD-123 layout compatibility is required |
Compared with BZX38450-B75-QF, the C75-QF trades minor voltage accuracy for faster switching and lower noise; versus MMSZ5265BT1G, it delivers identical regulation performance in 60 % less PCB area but requires tighter thermal management.
Availability
BZX38450-C75-QF is available at Aetrix Electronics and suitable for automotive battery monitoring, industrial sensor signal conditioning, portable medical device power supervision, and telecom line interface protection requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZX38450-C75-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.
The BZX58550-Q series belongs to Nexperia's automotive-grade Zener regulator portfolio, designed specifically for low-power, high-stability voltage reference and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the maximum continuous reverse voltage the BZX38450-C75-QF can sustain without breakdown?
The device is rated for nominal 75 V Zener voltage at 50 µA test current, with guaranteed minimum breakdown voltage of 71.25 V and maximum of 78.75 V (±5 %). It must not be subjected to reverse voltages exceeding 78.75 V in continuous operation to avoid uncontrolled conduction or thermal runaway.
How does the C-series leakage optimization affect long-term stability in precision reference circuits?
The intentional minor rise in leakage current improves switching speed and reduces noise but does not compromise long-term voltage stability; accelerated life testing per AEC-Q101 confirms <0.1 % VZ drift after 1000 hours at 125 °C, meeting automotive reference integrity requirements.
Can BZX38450-C75-QF replace older BZX84-C75 in existing SOD-323 designs?
No - BZX38450-C75-QF uses SOD523 (SC-79) package (1.2 mm × 0.8 mm), while BZX84-C75 uses SOD-323 (1.7 mm × 1.3 mm); footprint and solder pad dimensions are incompatible without PCB redesign and requalification.
What thermal derating applies above 25 °C ambient temperature?
Power dissipation must be linearly derated above 25 °C at 2.4 mW/°C (based on 300 mW @ 25 °C and Rth(j-a) = 350 K/W), reaching zero at 138 °C ambient - consistent with its 150 °C max junction temperature rating.
BZX38450-C75-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):
- 75 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 255 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 52.5 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-C75-QF FAQ
1.How can I place an order for BZX38450-C75-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C75-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-C75-QF reliable?
The price and inventory of BZX38450-C75-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-C75-QF is usually 5 days.
3.What payment methods are accepted for BZX38450-C75-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C75-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C75-QF?
BZX38450-C75-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C75-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-C75-QF?
For technical support, including BZX38450-C75-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C75-QF requirements.
6.How does Aetrix verify that BZX38450-C75-QF is sourced from the original manufacturer or authorized distributors?
All BZX38450-C75-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-C75-QF meets industry standards.
7.What is the process for return or replacement of BZX38450-C75-QF?
All BZX38450-C75-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C75-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-C75-QF part is unused and in its original packaging.
Return procedure for BZX38450-C75-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C75-QF Tags
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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