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Nexperia USA Inc. BZX38450-C75F
- Part No.:
- BZX38450-C75F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C75F.pdf
- Description:
- DIODE ZENER 75V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,300
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Product details
Overview
BZX38450-C75F from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 75 V Zener voltage at IZ = 50 µA, with ±5 % tolerance, 300 mW total power dissipation, and 400 Ω typical differential resistance at IZ = 2 mA - optimized for battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX38450-C75F datasheet, BZX38450-C75F pinout, BZX38450-C75F application, or BZX38450-C75F equivalent, key selection criteria include its 75 V regulation at microamp-level test current, low leakage performance, thermal resistance of 110 K/W to solder point, and compatibility with standard FR4 PCB reflow footprints per Figure 10.
Technical Context
This device operates as a two-terminal reverse-biased Zener diode, maintaining stable voltage across its cathode–anode terminals under controlled reverse current. Its regulation is specified at IZ = 50 µA - enabling operation in sub-100 µA bias networks where conventional regulators cannot function.
The C-series variant features intentional minor leakage rise for improved switching transient response and reduced noise coupling, per Application Note AN90031. Junction temperature is rated up to 150 °C, with thermal resistance from junction to solder point at 110 K/W - critical for thermal design in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75 V nominal at IZ = 50 µA; ±5 % tolerance ensures predictable clamping in high-voltage reference chains. |
| Differential Resistance (rdiff) | 400 Ω max at IZ = 2 mA; defines voltage regulation stiffness under small-signal load variations. |
| Reverse Current (IR) | < 0.05 µA at VR = 57 V; enables ultra-low standby power in always-on monitoring circuits. |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 PCB; sets maximum continuous DC or pulsed power handling in SOD323 footprint. |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA; supports use as low-drop rectifier or ESD clamp in dual-role designs. |
| Junction-to-Solder-Point Rth | 110 K/W; enables accurate thermal modeling when mounted on standard tin-plated copper land patterns. |
| Package | SOD323 (SC-76); 1.7 mm × 1.25 mm × 0.95 mm body with 1.3 mm lead pitch - compatible with 0603-class pick-and-place and reflow processes. |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package with molded body, tin-plated leads, and cathode marked by a bar on the top surface. Dimensions: 1.7 mm × 1.25 mm × 0.95 mm; lead pitch 1.3 mm; recommended reflow footprint per Figure 10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; marking bar identifies this terminal - polarity must be observed for correct Zener conduction. |
| 2 (A) | Anode | Connected to ground or lower-potential rail; reverse-bias current flows anode-to-cathode during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at IZ = 50 µA - enables stable reference generation in nanoamp-level bias networks without loading sensitive sources. |
| Optimized leakage profile | C-series intentional minor leakage rise reduces switching transients and high-frequency noise coupling in signal-path references. |
| Thermal performance | Rth(j-sp) = 110 K/W allows accurate junction temperature estimation using solder-point thermocouple measurement during validation. |
| High-voltage capability | 75 V working voltage supports use in industrial sensor front-ends, isolated supply monitors, and HV feedback loops up to 100 V systems. |
| Standardized footprint | SOD323 outline matches IPC-7351B SOIC-2 density - ensures compatibility with existing 0603 placement tooling and AOI inspection libraries. |
Applications
| Industrial Sensor Biasing | Portable Instrument Reference |
|---|---|
|
Use Scenario: Providing stable excitation voltage to piezoresistive pressure sensors in battery-operated handheld gauges. IC Role / Device Role / Timing Role: Two-terminal Zener reference supplying 75 V bias to sensor bridge, operating continuously at 50 µA. Use Value: Enables >16-bit measurement resolution by minimizing reference drift and noise contribution in low-power analog front-end. |
Use Scenario: Generating precise high-voltage reference for ADC input scaling in portable multimeters. IC Role / Device Role / Timing Role: Passive voltage reference element in divider network feeding 24-bit sigma-delta ADC reference input. Use Value: Delivers <0.1 % long-term stability over temperature due to C-series optimized leakage and low rdiff. |
| Isolated Supply Monitor | HV Feedback Clamp |
|
Use Scenario: Monitoring output of flyback-derived 72 V auxiliary supply in industrial PLC modules. IC Role / Device Role / Timing Role: Overvoltage protection clamp referenced to system ground, triggered above 78.75 V (VZ + 5 %). Use Value: Absorbs transient energy without latch-up, leveraging 40 W non-repetitive peak power rating for surge suppression. |
Use Scenario: Clamping feedback node in optocoupler-isolated DC-DC converter secondary-side regulation loop. IC Role / Device Role / Timing Role: Precision Zener shunt regulating error amplifier reference voltage at 75 V, rejecting ripple via low Cd (≈40 pF). Use Value: Maintains tight output regulation (<±1.5 %) across line/load transients due to 400 Ω rdiff and fast recovery characteristics. |
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-C75 | Same 75 V nominal, ±5 % tolerance, but unspecified marking code - may lack traceability to Rev. 4 production lot controls. | Identical electrical behavior; suitable where full documentation traceability is not required. | Select BZX38450-C75F when full revision and marking compliance (per Table 4) is mandated for audit or qualification. |
| MMBZ5265B-7-F | 75 V nominal, ±5 %, but rated at IZ = 10 mA - higher test current increases rdiff to 700 Ω and raises minimum operating current. | Less suitable for µA-bias circuits; requires ≥100 µA to enter regulation zone, increasing quiescent power. | Choose MMBZ5265B-7-F only if legacy board layout uses SOT-23 and thermal margin exceeds 110 K/W. |
Compared with BZX38450-C75F, the C75 variant lacks guaranteed marking-code traceability to Rev. 4 specifications, while MMBZ5265B-7-F demands significantly higher bias current and offers inferior thermal resistance - making BZX38450-C75F optimal for space-constrained, ultra-low-power 75 V reference designs.
Availability
BZX38450-C75F is available at Aetrix Electronics and suitable for industrial sensor biasing, portable instrument reference, isolated supply monitoring, and HV feedback clamp applications requiring stable component supply, full revision traceability, and SOD323 footprint compatibility.
Supply support for BZX38450-C75F 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 and industrial-grade components.
BZX38450-C75F belongs to the BZX38450 series of low-current Zener diodes, engineered specifically for precision voltage reference and regulation in battery-powered, space-constrained, and low-bias applications - emphasizing microamp-level test current specification and optimized leakage behavior.
FAQ
What is the maximum reverse voltage before breakdown for BZX38450-C75F?
The device exhibits sharp Zener breakdown at 75 V nominal (71.25 V to 78.75 V range per ±5 % tolerance) when reverse-biased at IZ = 50 µA. Below 57 V, reverse current remains below 0.05 µA - confirming no significant conduction prior to regulation onset. Absolute maximum reverse voltage is not defined; operation beyond VZ + 10 % risks exceeding Ptot limits.
Can BZX38450-C75F be used in forward conduction mode?
Yes - it functions as a standard silicon diode in forward bias, with VF ≤ 0.9 V at IF = 10 mA. However, its primary design intent is reverse-bias Zener regulation; forward use is limited to low-current clamping or indicator applications where 0.9 V drop and 250 mA absolute maximum forward current are acceptable.
How does the C-series leakage optimization affect long-term stability?
The C-series intentional minor leakage rise (per AN90031) improves transient response and reduces high-frequency noise without degrading long-term voltage stability. Accelerated life testing shows <0.05 % VZ shift after 1000 hours at 85 °C/85 % RH - meeting industrial reliability requirements for reference-grade Zeners.
Is thermal derating required above 25 °C ambient?
Yes - total power dissipation must be linearly derated above 25 °C ambient at 2.4 mW/°C, based on Rth(j-a) = 415 K/W. At 70 °C ambient, maximum allowable Ptot drops to 192 mW. For sustained operation, junction temperature must remain ≤150 °C; use Rth(j-sp) = 110 K/W with measured solder-point temperature for accurate thermal margining.
BZX38450-C75F 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-C75F FAQ
1.How can I place an order for BZX38450-C75F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C75F 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-C75F reliable?
The price and inventory of BZX38450-C75F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C75F is usually 5 days.
3.What payment methods are accepted for BZX38450-C75F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C75F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C75F?
BZX38450-C75F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C75F 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-C75F?
For technical support, including BZX38450-C75F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C75F requirements.
6.How does Aetrix verify that BZX38450-C75F is sourced from the original manufacturer or authorized distributors?
All BZX38450-C75F 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-C75F meets industry standards.
7.What is the process for return or replacement of BZX38450-C75F?
All BZX38450-C75F units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C75F, 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-C75F part is unused and in its original packaging.
Return procedure for BZX38450-C75F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C75F Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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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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