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Nexperia USA Inc. BZX38450-C3V9-QF
- Part No.:
- BZX38450-C3V9-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C3V9-QF.pdf
- Description:
- DIODE ZENER 3.9V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:29,899
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Product details
Overview
BZX38450-C3V9-QF from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 3.9 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-C3V9-QF datasheet, BZX38450-C3V9-QF pinout, BZX38450-C3V9-QF application, or BZX38450-C3V9-QF equivalent, key selection criteria include low-bias operation at 50 µA, thermal resistance of 110 K/W (junction-to-solder point), differential resistance ≤95 Ω at 5 mA, temperature coefficient of −2.7 mV/K, and reverse leakage ≤2.0 µA at 3.0 V.
Technical Context
This Zener diode operates as a shunt voltage reference in low-power bias networks, leveraging its specified regulation voltage (3.70–4.10 V) at IZ = 50 µA to stabilize supply rails in battery-powered sensor nodes and automotive microcontroller reset circuits.
Its design integrates intentional leakage optimization per AN90031 for fast switching transients and reduced noise, while maintaining junction temperature limits up to 150 °C and ambient operating range from −55 °C to +150 °C under qualified AEC-Q101 stress testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.9 V (min 3.70 V, max 4.10 V at IZ = 50 µA); defines stable reference point for low-current biasing |
| Tolerance | ±5 % (C-series); enables cost-optimized selection where tight regulation is not required |
| Differential Resistance | ≤95 Ω at IZ = 5 mA; ensures minimal output voltage shift under small load variations |
| Temperature Coefficient | −2.7 mV/K; provides predictable, negative drift for compensation in temperature-sensitive analog stages |
| Forward Voltage | ≤0.9 V at IF = 10 mA; supports reliable anode-cathode conduction during power-up or fault conditions |
| Reverse Leakage | ≤2.0 µA at VR = 3.0 V; guarantees minimal quiescent current draw in always-on monitoring circuits |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C on FR4 PCB; sets maximum continuous bias current limit (~77 mA at 3.9 V) |
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 | Cathode (K) | Connected to regulated output node; carries reverse-biased Zener current during regulation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes bias path for shunt regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current specification | Regulation defined at 50 µA - enables direct use in ultra-low-power IoT sensors without additional bias circuitry |
| AEC-Q101 qualification | Qualified for automotive applications including body control modules and infotainment power supervisors |
| Optimized leakage profile | Intentional minor rise in leakage per AN90031 improves transient response and reduces high-frequency noise in feedback paths |
| Thermal performance | Junction-to-solder-point thermal resistance of 110 K/W allows reliable operation on standard FR4 with minimal copper area |
Applications
| Automotive Microcontroller Reset Circuit | Portable Gas Sensor Bias Network |
|---|---|
Use Scenario: Provides clean, temperature-stable reset threshold for automotive MCU during cold cranking and load dump events. IC Role / Device Role / Timing Role: Shunt Zener reference establishing precise 3.9 V trip point for reset supervisor IC input. Use Value: AEC-Q101 qualification ensures reliability across −40 °C to +125 °C engine bay environments; −2.7 mV/K TC enables predictable reset window shift over temperature. |
Use Scenario: Supplies stable bias voltage to electrochemical gas sensing elements in handheld air quality monitors. IC Role / Device Role / Timing Role: Low-current Zener reference generating fixed 3.9 V excitation for sensor bridge circuitry. Use Value: 50 µA regulation current matches typical sensor bias requirements; ≤2.0 µA leakage at 3.0 V preserves battery life in multi-year deployments. |
| Industrial PLC Input Protection Clamp | Medical Wearable Signal Conditioning Reference |
Use Scenario: Clamps transient overvoltage on 4–20 mA loop inputs while maintaining precision signal integrity. IC Role / Device Role / Timing Role: Bidirectional protection element-Zener clamping reverse surges and forward diode limiting positive spikes. Use Value: 300 mW power rating handles IEC 61000-4-5 surge energy; 0.9 V forward drop prevents false triggering during normal operation. |
Use Scenario: Sets accurate DC offset for low-noise instrumentation amplifiers in ECG front-end stages. IC Role / Device Role / Timing Role: Low-noise shunt reference providing stable 3.9 V common-mode level for differential signal chain. Use Value: Optimized leakage profile per AN90031 suppresses broadband noise coupling into sensitive analog paths; SOD323 footprint minimizes board space in compact wearable designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C3V9 | Same 3.9 V, ±5 %, SOD323 package but non-AEC-Q101; higher rdiff (120 Ω vs. 95 Ω) at 5 mA | Lacks automotive qualification; suitable only for industrial or consumer-grade systems | Select when AEC-Q101 is not required and cost sensitivity outweighs thermal/noise optimization |
| MMSZ4685T1G | 3.9 V, ±5 %, SOD-123 package; 500 mW Ptot; rdiff = 130 Ω at 5 mA; no intentional leakage tuning | Larger footprint (3.7 mm × 1.6 mm); higher power handling but less optimized for low-noise, low-IZ use | Prefer when higher surge robustness is needed and board space permits larger package |
Compared with BZX38450-C3V9-QF, BZX384-C3V9 omits automotive qualification and noise-optimized leakage, while MMSZ4685T1G trades SOD323 miniaturization and low-noise behavior for higher power margin and legacy footprint compatibility.
Availability
BZX38450-C3V9-QF is available at Aetrix Electronics and suitable for automotive electronics, portable medical devices, and industrial sensor interfaces requiring stable component supply with AEC-Q101 compliance and low-quiescent-current regulation.
Supply support for BZX38450-C3V9-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, high-reliability discrete and logic devices for automotive, industrial, and mobile markets.
The BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for low-current, low-noise voltage regulation in harsh-environment automotive and portable electronics applications.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX38450-C3V9-QF has a nominal Zener voltage of 3.9 V with guaranteed regulation between 3.70 V and 4.10 V at 50 µA. Its absolute maximum non-repetitive peak reverse power dissipation is 40 W for 100 µs pulses, but sustained reverse voltage must remain within the specified working range to avoid thermal runaway or parametric shift.
Does this part support reflow soldering, and what footprint is recommended?
Yes, BZX38450-C3V9-QF is qualified for reflow soldering per J-STD-020. The recommended reflow footprint is defined in Figure 10 of the datasheet: 0.6 mm × 0.5 mm solder lands, 1.35 mm center-to-center pitch, with 0.95 mm device height clearance. Standard SOD323 land patterns on FR4 with single-sided copper are validated.
How does the "C" suffix differ from the "B" suffix in the BZX38450-Q series?
The "C" suffix denotes ±5 % tolerance and incorporates intentional minor leakage current optimization per AN90031 for faster switching and lower noise. The "B" suffix indicates ±2 % tolerance and standard leakage characteristics. Both share identical package, power rating, and AEC-Q101 qualification.
Can this Zener diode be used in series or parallel configurations for higher voltage or current capability?
No - BZX38450-C3V9-QF is not designed for series/parallel operation. Its tight thermal coupling in SOD323 and mismatched temperature coefficients would cause current hogging and premature failure. For higher voltage, select a single higher-VZ part; for higher current, use an active regulator or discrete transistor-Zener hybrid.
BZX38450-C3V9-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):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 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-C3V9-QF FAQ
1.How can I place an order for BZX38450-C3V9-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C3V9-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-C3V9-QF reliable?
The price and inventory of BZX38450-C3V9-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-C3V9-QF is usually 5 days.
3.What payment methods are accepted for BZX38450-C3V9-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C3V9-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C3V9-QF?
BZX38450-C3V9-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C3V9-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-C3V9-QF?
For technical support, including BZX38450-C3V9-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C3V9-QF requirements.
6.How does Aetrix verify that BZX38450-C3V9-QF is sourced from the original manufacturer or authorized distributors?
All BZX38450-C3V9-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-C3V9-QF meets industry standards.
7.What is the process for return or replacement of BZX38450-C3V9-QF?
All BZX38450-C3V9-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C3V9-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-C3V9-QF part is unused and in its original packaging.
Return procedure for BZX38450-C3V9-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C3V9-QF Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
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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