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Nexperia USA Inc. BZX8450-C39VL
- Part No.:
- BZX8450-C39VL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C39VL.pdf
- Description:
- DIODE ZENER 39V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,848
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Product details
Overview
BZX8450-C39VL from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and low-power biasing in portable electronics. It delivers a nominal 39 V regulation at 50 µA test current, with ±5 % tolerance, 350 Ω dynamic impedance at 2 mA, and 0.05 µA reverse leakage at rated voltage - enabling stable operation in battery-powered sensor nodes and microcontroller reset circuits.
For engineers reviewing the BZX8450-C39VL datasheet, BZX8450-C39VL pinout, BZX8450-C39VL application, or BZX8450-C39VL equivalent, key selection criteria include its low-test-current specification (50 µA), intentional leakage optimization for noise reduction per AN90031, SOT23 footprint compatibility, and thermal resistance of 330 K/W to solder point - critical for compact, thermally constrained designs.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 37.05 V to 40.95 V at IZ = 50 µA, exhibiting a positive temperature coefficient of +0.05 mV/K and diode capacitance of 45 pF at 0 V. Its differential resistance rises to 350 Ω at 2 mA, reflecting typical low-current Zener behavior optimized for minimal quiescent power draw.
The device features a non-connected (n.c.) terminal (Pin 2), isolating the cathode-anode path from parasitic coupling. Its thermal design targets junction-to-solder-point resistance of 330 K/W, supporting reliable operation up to 150 °C junction temperature under pulsed surge conditions up to 40 W for 100 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage (VZ) | 37.05 V to 40.95 V at IZ = 50 µA - defines precise low-bias reference window for 3.3 V/5 V system monitoring |
| Tolerance | ±5 % - matches C-series grading for cost-sensitive industrial and consumer voltage clamping |
| Differential Resistance (rdiff) | 350 Ω at IZ = 2 mA - indicates moderate regulation stiffness suitable for signal-level references, not high-current loads |
| Reverse Leakage (IR) | 0.05 µA at VR = 39 V - enables ultra-low standby current in battery-backed circuits |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - ensures minimal conduction loss when used in forward-biased protection paths |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous DC power budget for thermal layout |
| Junction-to-Solder-Point Rth | 330 K/W - quantifies thermal path efficiency from die to PCB copper, guiding heatsinking decisions |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, single-sided FR4 mounting with 70 µm tin-plated copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-bias connection point; must be held at lower potential than cathode for Zener operation |
| 2 | Not Connected (n.c.) | Internally unconnected terminal - no PCB trace or solder joint required; avoids unintended parasitic coupling |
| 3 | Cathode (K) | Reverse-bias reference node; connects to regulated voltage rail and provides thermal path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - reduces system bias current by >95 % vs. standard 5 mA Zeners, extending battery life |
| Optimized leakage profile | Intentional minor rise in IR per AN90031 - suppresses switching noise in ADC reference and clock buffer circuits |
| Thermal performance | Rth(j-sp) = 330 K/W - enables direct thermal coupling to PCB ground plane without external heatsink |
| Small-footprint packaging | SOT23 outline with 1.9 mm pitch - supports high-density routing in space-constrained IoT modules and wearables |
| Voltage range coverage | 39 V nominal with ±5 % tolerance - fills mid-range Zener gap between 33 V and 47 V for legacy supply rail monitoring |
Applications
| Microcontroller Reset Circuit | Portable Sensor Bias Reference |
|---|---|
Use Scenario: Generating a stable 39 V threshold to trigger reset logic when main supply drops below safe operating level. IC Role / Device Role / Timing Role: Zener-based voltage comparator input reference, directly interfacing with reset supervisor IC inputs. Use Value: Enables deterministic reset assertion at 39 V ±5 % with <0.1 µA quiescent drain, preserving battery charge during deep sleep. |
Use Scenario: Providing a low-drift reference for analog front-end amplifiers in battery-powered environmental sensors. IC Role / Device Role / Timing Role: Precision DC bias source for op-amp gain-setting networks and ADC reference dividers. Use Value: Delivers 39 V reference stability over −40 °C to +85 °C with <0.05 mV/K TC, reducing calibration drift in field-deployed units. |
| USB-C PD Overvoltage Clamp | Industrial PLC Input Protection |
Use Scenario: Clamping transient surges on USB-C power delivery lines exceeding 39 V to protect downstream PMICs. IC Role / Device Role / Timing Role: Fast-reacting shunt protection element placed before buck converter input stage. Use Value: Absorbs 40 W non-repetitive surges (100 µs) while maintaining <45 pF capacitance to avoid signal integrity degradation on 10 Mbps CC lines. |
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers against accidental 48 V miswiring. IC Role / Device Role / Timing Role: Primary overvoltage limiter in series with current-limiting resistor and optocoupler input. Use Value: Withstands continuous 250 mW dissipation on FR4 PCB and limits fault voltage to ≤41 V, preventing optocoupler damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C39 | Same 39 V nominal, ±5 %, but rated at 10 mA test current and 600 Ω rdiff at 5 mA | Higher bias current requirement; less suitable for sub-µA standby systems | Prefer when higher regulation stiffness is needed and 10 mA bias is available |
| MMSZ5245B | 39 V nominal, ±5 %, 500 mW Ptot, 170 Ω rdiff at 20 mA, SOD-123 package | Larger footprint and higher power rating; requires more board area and thermal margin | Choose when higher surge energy handling (e.g., >100 mJ) or tighter rdiff is prioritized over size |
Compared with BZX8450-C39VL, BZX84-C39 demands 200× more test current and offers poorer low-current regulation, while MMSZ5245B trades SOT23 miniaturization for higher power and lower impedance - making BZX8450-C39VL optimal for ultra-low-power, space-constrained Zener reference use cases.
Availability
BZX8450-C39VL is available at Aetrix Electronics and suitable for microcontroller reset circuits, portable sensor bias references, USB-C PD overvoltage clamps, and industrial PLC input protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX8450-C39VL 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.
The BZX8450 series belongs to Nexperia's low-current Zener regulator product line, engineered specifically for battery-powered and thermally constrained applications where minimal test current, controlled leakage, and SOT23 scalability are essential.
FAQ
What is the maximum continuous reverse power this diode can handle?
The BZX8450-C39VL 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. This rating assumes natural convection cooling and defines the upper bound for steady-state Zener current (IZ ≈ 6.4 mA at 39 V). Exceeding this derates linearly above 25 °C per the 500 K/W junction-to-ambient thermal resistance.
Why does Pin 2 show 'n.c.' and how should it be handled on the PCB?
Pin 2 is internally not connected and serves only as a mechanical anchor in the SOT23 mold compound. It must remain unconnected on the PCB - no trace, pad, or solder joint should link to it. Routing traces near Pin 2 is permissible, but grounding or biasing it introduces risk of contamination-induced leakage or mechanical stress fracture. The official Nexperia footprint (Fig. 10) omits solder paste on Pin 2.
How does the 'intentional minor rise of leakage current' improve noise performance?
Per Application Note AN90031, the controlled increase in reverse leakage (e.g., 0.05 µA at 39 V) stabilizes carrier injection dynamics in the depletion region, suppressing avalanche-mode current spikes that cause broadband noise. This results in cleaner reference voltages for precision ADCs and low-jitter clock buffers - verified by reduced RMS noise in 10 Hz–100 kHz measurements versus legacy Zeners with identical VZ.
Can this Zener be used in forward conduction mode, and what are the limits?
Yes - the BZX8450-C39VL functions as a standard silicon diode in forward bias, with VF ≤ 0.9 V at 10 mA. Its absolute maximum forward current is 200 mA (Table 5), but continuous operation above 100 mA risks exceeding 250 mW total dissipation. For forward applications like polarity protection, ensure pulse duration stays within safe SOA limits and verify thermal relief on the anode (Pin 1) pad given its higher Rth(j-sp) vs. cathode.
BZX8450-C39VL 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-C39VL FAQ
1.How can I place an order for BZX8450-C39VL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C39VL 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-C39VL reliable?
The price and inventory of BZX8450-C39VL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C39VL is usually 5 days.
3.What payment methods are accepted for BZX8450-C39VL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C39VL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C39VL?
BZX8450-C39VL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C39VL 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-C39VL?
For technical support, including BZX8450-C39VL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C39VL requirements.
6.How does Aetrix verify that BZX8450-C39VL is sourced from the original manufacturer or authorized distributors?
All BZX8450-C39VL 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-C39VL meets industry standards.
7.What is the process for return or replacement of BZX8450-C39VL?
All BZX8450-C39VL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C39VL, 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-C39VL part is unused and in its original packaging.
Return procedure for BZX8450-C39VL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C39VL 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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