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Nexperia USA Inc. BZX38450-C3V3-QF
- Part No.:
- BZX38450-C3V3-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C3V3-QF.pdf
- Description:
- DIODE ZENER 3.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:29,950
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Product details
Overview
BZX38450-C3V3-QF from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 3.3 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-C3V3-QF datasheet, BZX38450-C3V3-QF pinout, BZX38450-C3V3-QF application, or BZX38450-C3V3-QF equivalent, key selection criteria include low-bias operation capability, thermal resistance (Rth(j-a) = 415 K/W), cathode-anode polarity marking, and leakage current optimization per AN90031 for noise-sensitive regulation.
Technical Context
This device operates as a two-terminal shunt voltage reference, maintaining stable 3.3 V output across load variations by conducting reverse current above its breakdown threshold. Its specified test current of 50 µA enables ultra-low quiescent current design in battery-powered systems.
It features intentional minor leakage current rise (per AN90031) to improve switching speed and reduce noise in dynamic regulation paths, and is qualified to AEC-Q101 for under-hood automotive environments with operating ambient temperature from −55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 3.3 V at IZ = 50 µA - defines precise regulation point for low-power bias networks |
| Tolerance | ±5 % - supports cost-optimized designs where tighter regulation is not required |
| Differential Resistance (rdiff) | ≤600 Ω at IZ = 50 µA - indicates moderate regulation stiffness under light-load conditions |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - ensures minimal forward conduction loss in dual-direction protection schemes |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Junction Temperature (Tj) | 150 °C maximum - enables reliable operation in high-temperature automotive compartments |
| Thermal Resistance (Rth(j-a)) | 415 K/W - determines temperature rise per watt on single-sided FR4 board without copper pour |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package; 2 leads; 1.3 mm pitch; 1.7 mm × 1.25 mm × 0.95 mm body; cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated voltage node; reverse-biased terminal during Zener operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables direct use in microamp-level bias chains without external amplification |
| AEC-Q101 qualification | Qualified for automotive applications - meets stress-test requirements for vibration, temperature cycling, and humidity |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching transients and broadband noise in fast-turning regulation loops |
| Small-footprint packaging | SOD323 outline (1.7 mm × 1.25 mm) - saves board space in compact portable and automotive ECUs |
Applications
| Automotive Cabin Control Module | Portable Medical Sensor Bias |
|---|---|
Use Scenario: Providing stable 3.3 V reference for microcontroller ADC and sensor interface circuitry in HVAC control units. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing precision analog reference rail independent of main supply fluctuations. Use Value: AEC-Q101 qualification ensures reliability over 15-year vehicle lifetime; ±5 % tolerance aligns with 12-bit ADC full-scale accuracy requirements. |
Use Scenario: Supplying ultra-low-current bias voltage to MEMS pressure sensors in handheld diagnostic devices. IC Role / Device Role / Timing Role: Low-quiescent Zener reference enabling multi-week battery life in intermittent-sampling mode. Use Value: 50 µA test current matches typical sensor bias needs; 300 mW rating allows safe margin during brief wake-up surges. |
| Industrial IoT Node Power Management | USB-C Power Negotiation Reference |
Use Scenario: Regulating auxiliary 3.3 V rail for BLE radio and environmental sensors in edge gateways deployed in factory settings. IC Role / Device Role / Timing Role: Standalone voltage clamp protecting downstream LDO input from transient overvoltage events. Use Value: 415 K/W junction-to-ambient thermal resistance permits operation up to +85 °C ambient without derating on standard PCB layout. |
Use Scenario: Generating accurate 3.3 V reference for CC line voltage monitoring in USB-C PD sink controllers. IC Role / Device Role / Timing Role: Precision shunt reference defining USB PD contract negotiation thresholds. Use Value: ±5 % tolerance satisfies USB PD 3.1 specification for VCONN and CC line sensing; SOD323 footprint fits tight connector-side routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B3V3 | Same 3.3 V nominal, ±2 % tolerance, but no AEC-Q101 qualification; higher rdiff (≤1000 Ω at 50 µA) | Not suitable for automotive; acceptable for consumer-grade portable electronics | Select when tighter voltage tolerance is critical and automotive qualification is unnecessary |
| MMSZ5226ET1G | 3.3 V nominal, ±5 %, SOD-123 package (larger footprint), Ptot = 500 mW, Rth(j-a) = 350 K/W | Better thermal performance but incompatible with space-constrained SOD323 layouts | Select when higher power margin is needed and board area permits larger package |
Compared with BZX38450-C3V3-QF, BZX384-B3V3 offers tighter tolerance but lacks automotive qualification and has higher impedance, while MMSZ5226ET1G provides greater power headroom and better thermal resistance but requires layout redesign due to SOD-123 size.
Availability
BZX38450-C3V3-QF is available at Aetrix Electronics and suitable for automotive cabin control modules, portable medical sensor bias circuits, and industrial IoT node power management requiring stable component supply with AEC-Q101 assurance.
Supply support for BZX38450-C3V3-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 delivering high-performance logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization.
The BZX38450-Q series belongs to Nexperia's automotive-qualified Zener diode product line, designed specifically for low-current, noise-sensitive voltage regulation in harsh-environment electronics.
FAQ
What is the maximum reverse current (IR) at VR = 2.5 V for BZX38450-C3V3-QF?
At VR = 2.5 V and Tj = 25 °C, the typical reverse current is ≤0.8 µA. This value is derived from Figure 5 in the datasheet, which shows the BZX38450-C3V3-QF curve intersecting 2.5 V at approximately 0.8 µA on the logarithmic IR–VR plot for the C-series 3.3 V variant.
Can BZX38450-C3V3-QF be used in parallel for higher power handling?
No - Zener diodes exhibit manufacturing spread in VZ, causing current hogging in parallel configurations. The datasheet does not recommend paralleling; instead, use a single higher-power Zener or add external ballast resistors if increased dissipation is required.
Is the cathode marking consistent across all BZX38450-Q series variants?
Yes - all BZX38450-Q series devices use a bar marking on the top surface to indicate the cathode (Pin 1), as confirmed in Table 2 (Pinning information) and Figure 9 (Package outline). This marking is standardized across the entire series including BZX38450-C3V3-QF.
Does the "QF" suffix indicate tape-and-reel packaging?
Yes - per Nexperia's ordering nomenclature, the "QF" suffix denotes 10,000-piece tape-and-reel packaging in 8 mm carrier tape, compatible with high-speed SMT placement equipment. This is distinct from "QL" (3,000 pcs) or "QM" (15,000 pcs) variants.
BZX38450-C3V3-QF 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):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 1.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-C3V3-QF FAQ
1.How can I place an order for BZX38450-C3V3-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C3V3-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-C3V3-QF reliable?
The price and inventory of BZX38450-C3V3-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-C3V3-QF is usually 5 days.
3.What payment methods are accepted for BZX38450-C3V3-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C3V3-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C3V3-QF?
BZX38450-C3V3-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C3V3-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-C3V3-QF?
For technical support, including BZX38450-C3V3-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C3V3-QF requirements.
6.How does Aetrix verify that BZX38450-C3V3-QF is sourced from the original manufacturer or authorized distributors?
All BZX38450-C3V3-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-C3V3-QF meets industry standards.
7.What is the process for return or replacement of BZX38450-C3V3-QF?
All BZX38450-C3V3-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C3V3-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-C3V3-QF part is unused and in its original packaging.
Return procedure for BZX38450-C3V3-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C3V3-QF Tags
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MM5Z5V1ST1G
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