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Nexperia USA Inc. BZX8450-C39-QVL
- Part No.:
- BZX8450-C39-QVL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C39-QVL.pdf
- Description:
- DIODE ZENER 39V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,993
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Product details
Overview
BZX8450-C39-Q from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and clamping in automotive and portable electronics. It delivers a nominal 39 V regulation at 50 µA test current, with ±5 % tolerance, 350 Ω differential resistance at 2 mA, and 0.05 µA reverse leakage at rated voltage - optimized for battery-powered systems requiring stable low-bias operation.
For engineers reviewing the BZX8450-C39-Q datasheet, BZX8450-C39-Q pinout, BZX8450-C39-Q application, or BZX8450-C39-Q equivalent, this device serves as a qualified AEC-Q101 Zener for automotive sensor biasing, ECU power rail clamping, and low-quiescent microcontroller reference circuits where tight thermal stability and minimal leakage are critical.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 37.05 V to 40.95 V at 50 µA, exhibiting a positive temperature coefficient of +0.05 mV/K and diode capacitance of 45 pF at 0 V. Its non-repetitive peak reverse power dissipation reaches 40 W for 100 µs pulses, enabling transient overvoltage suppression.
The device features intentional minor leakage rise per AN90031 to improve switching speed and reduce noise, and is mounted on FR4 PCB with single-sided 70 µm copper - yielding 330 K/W junction-to-solder-point thermal resistance and 500 K/W junction-to-ambient resistance in free air.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 39 V (37.05 V min / 40.95 V max at IZ = 50 µA) |
| Tolerance | ±5 % (C-series grading; enables cost-effective selection for non-critical regulation) |
| Differential Resistance | 350 Ω (at IZ = 2 mA; defines voltage regulation slope under load variation) |
| Reverse Leakage Current | 0.05 µA (at VR = 39 V; ensures ultra-low standby power in battery systems) |
| Forward Voltage | 0.9 V (at IF = 10 mA; supports polarity-check and basic rectification functions) |
| Total Power Dissipation | 250 mW (at Tamb ≤ 25 °C on standard FR4; sets continuous DC power limit) |
| Junction Temperature Limit | 150 °C (enables operation in under-hood automotive environments) |
Pinout & Package
SOT23 plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body, with tin-plated terminations and standard reflow footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node in reverse-biased Zener configuration; forward conduction path when used as rectifier |
| 2 | Not Connected (n.c.) | Internally unconnected terminal; must remain floating - no PCB trace or solder joint required |
| 3 | Cathode (K) | Connects to higher-potential node; primary current entry point during Zener breakdown; thermal path to PCB via cathode tab |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Qualified for automotive applications including engine control units and ADAS sensors |
| Low test current operation | Specified at 50 µA - reduces quiescent current in always-on battery circuits |
| Optimized leakage profile | Intentional minor IR rise per AN90031 improves switching speed and broadband noise rejection |
| Thermal performance | 330 K/W junction-to-solder-point resistance enables reliable heat transfer through cathode pad |
| Small-footprint packaging | SOT23 footprint compatible with high-density PCB layouts and automated assembly |
Applications
| Automotive Sensor Biasing | Microcontroller Reference Clamping |
|---|---|
Use Scenario: Providing stable bias voltage to analog front-end circuits in wheel-speed or pressure sensors within engine compartments. IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp protecting ADC input stages. Use Value: ±5 % tolerance and 150 °C junction rating ensure accuracy and reliability across automotive temperature ranges without external compensation. |
Use Scenario: Clamping VREF pins of 3.3 V or 5 V microcontrollers against supply transients in infotainment modules. IC Role / Device Role / Timing Role: Precision shunt regulator maintaining reference integrity during load dump events. Use Value: 40 W non-repetitive surge capability absorbs ISO 7637-2 pulse 5a transients without degradation. |
| Portable Device Power Monitoring | Industrial Signal Conditioning |
Use Scenario: Monitoring battery voltage in Bluetooth trackers using a resistive divider into an MCU ADC, with Zener-based overvoltage protection. IC Role / Device Role / Timing Role: Low-leakage (0.05 µA) voltage clamp preventing ADC saturation during charging peaks. Use Value: Ultra-low reverse current preserves battery life while maintaining fast response to overvoltage conditions. |
Use Scenario: Stabilizing excitation voltage for 4–20 mA loop-powered transmitters in factory automation systems. IC Role / Device Role / Timing Role: Shunt regulator establishing precise 39 V headroom for current-loop driver ICs. Use Value: 350 Ω dynamic impedance ensures <10 mV output shift across 0–2 mA load variations in transmitter bias networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C39 | Non-AEC-Q101; ±5 % tolerance; identical 39 V nominal, but lacks automotive qualification and optimized leakage profile | Restricted to commercial-grade consumer or industrial equipment without automotive lifecycle requirements | Select when AEC-Q101 compliance is unnecessary and cost sensitivity outweighs long-term reliability validation |
| MMSZ5245B | ±5 % tolerance; 39 V nominal; 500 mW Ptot; higher 500 Ω rdiff at 20 mA; no AEC-Q101 qualification | Higher power handling but poorer regulation slope and unqualified for automotive use | Prefer only if board space allows larger SOD-123 and system requires >250 mW continuous dissipation |
Compared with BZX8450-C39-Q, BZX84-C39 omits automotive qualification and leakage optimization, while MMSZ5245B trades AEC-Q101 compliance for higher power and looser regulation - making the BZX8450-C39-Q uniquely suited for space-constrained, safety-conscious automotive subsystems demanding low-leakage precision.
Availability
BZX8450-C39-Q is available at Aetrix Electronics and suitable for automotive sensor biasing, microcontroller reference clamping, and portable device power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX8450-C39-Q 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 BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for low-current voltage regulation in harsh-environment automotive electronics where precision, longevity, and noise resilience are mandatory.
FAQ
What is the maximum continuous reverse power dissipation for BZX8450-C39-Q?
The BZX8450-C39-Q has a total power dissipation limit of 250 mW at ambient temperatures ≤25 °C when mounted on a standard FR4 PCB with single-sided 70 µm copper. Derating is required above 25 °C at 2.0 mW/°C based on its 500 K/W junction-to-ambient thermal resistance.
Does BZX8450-C39-Q support bidirectional transient protection?
No - BZX8450-C39-Q is a unidirectional Zener diode configured for reverse-bias regulation only. Its anode and cathode terminals are not symmetrical; it conducts in forward bias up to 0.9 V at 10 mA but provides no clamping or protection in forward direction beyond that threshold.
How does the "intentional minor rise of leakage current" benefit circuit performance?
Per AN90031, the controlled increase in leakage improves carrier sweep-out speed during turn-off, reducing recovery time and minimizing high-frequency ringing in switching nodes - directly enhancing noise immunity in sensitive analog signal paths and fast-switching power supplies.
Can BZX8450-C39-Q be used in parallel for higher power handling?
No - Zener diodes exhibit manufacturing spread in breakdown voltage, causing current imbalance when paralleled. Even with matched units, thermal runaway risk remains due to positive temperature coefficient. For higher power, select a single higher-rated Zener or implement active regulation instead.
BZX8450-C39-QVL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8450
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 29.6 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:
- TO-236AB
BZX8450-C39-QVL FAQ
1.How can I place an order for BZX8450-C39-QVL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C39-QVL 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 BZX8450-C39-QVL reliable?
The price and inventory of BZX8450-C39-QVL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C39-QVL is usually 5 days.
3.What payment methods are accepted for BZX8450-C39-QVL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C39-QVL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C39-QVL?
BZX8450-C39-QVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C39-QVL 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 BZX8450-C39-QVL?
For technical support, including BZX8450-C39-QVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C39-QVL requirements.
6.How does Aetrix verify that BZX8450-C39-QVL is sourced from the original manufacturer or authorized distributors?
All BZX8450-C39-QVL 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 BZX8450-C39-QVL meets industry standards.
7.What is the process for return or replacement of BZX8450-C39-QVL?
All BZX8450-C39-QVL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C39-QVL, 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 BZX8450-C39-QVL part is unused and in its original packaging.
Return procedure for BZX8450-C39-QVL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C39-QVL 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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