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onsemi BZX85C3V9_T50R
- Part No.:
- BZX85C3V9_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C3V9_T50R.pdf
- Description:
- DIODE ZENER 3.9V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:2,786
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Product details
Overview
BZX85C3V9_T50R from onsemi is a 3.9 V, ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, rated for 1 mA test current, with 60 Ω dynamic impedance at 5 mA and 5 μA maximum leakage at 1 V reverse bias, used for voltage regulation and reference in low-power linear power supplies and overvoltage protection circuits.
For engineers reviewing the BZX85C3V9_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, power dissipation derating above 50°C, thermal resistance, cathode identification via color band, and compatibility with through-hole PCB assembly processes.
Technical Context
This device operates as a two-terminal silicon junction diode optimized for stable reverse-breakdown behavior under controlled DC bias. It maintains regulation across 1 mA to 76 mA operating range, with thermal equilibrium defined at 30°C lead temperature per JEDEC test method.
The DO-41 glass package provides hermetic sealing and supports 200°C maximum junction temperature. Derating begins at 50°C ambient, with 6.67 mW/°C linear reduction in power capability up to TJ = 200°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.7 V min / 4.1 V max at IZ = 1 mA - defines regulated output range under nominal bias |
| Power Dissipation (PD) | 1.0 W @ TA = 25°C - sets maximum continuous DC power handling in free-air |
| Zener Impedance (ZZ) | 60 Ω @ IZ = 5 mA - determines regulation stiffness and AC ripple rejection |
| Leakage Current (IR) | 5 μA max @ VR = 1 V - ensures minimal standby current in high-impedance bias networks |
| Operating Temp Range | −65°C to +200°C - enables use in automotive under-hood and industrial control environments |
| Forward Voltage (VF) | 1.2 V max @ IF = 200 mA - supports use as clamping diode in bidirectional protection schemes |
Pinout & Package
DO-41 glass axial package with cathode identified by single black band near one lead end. Leads are tinned copper-clad steel, suitable for wave soldering and hand assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener breakdown reference node | Connected to lower-potential side of regulated circuit; establishes reference ground point in shunt regulator topology |
| Cathode | Reverse-biased breakdown terminal / voltage reference output | Marked with black band; connected to input rail in shunt configuration to clamp excess voltage |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-assembly trimming in cost-sensitive consumer and industrial designs |
| 1.0 W power rating with 6.67 mW/°C derating | Supports robust operation in compact enclosures with limited airflow and moderate ambient temperatures |
| DO-41 glass hermetic package | Provides long-term stability and moisture resistance for applications requiring >10-year field life |
| Low 5 μA leakage at 1 V | Minimizes quiescent current draw in battery-powered sensor nodes and always-on monitoring circuits |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Low-cost linear regulator feedback network in wall-adaptor-derived 5 V or 3.3 V supplies. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise output setpoint for series pass transistor or op-amp error amplifier. Use Value: Maintains ±2% output accuracy across load and line variations without external trimming components. |
Use Scenario: Input-stage protection for microcontroller GPIO pins exposed to transient surges. IC Role / Device Role / Timing Role: Bidirectional clamping element limiting voltage excursions to safe levels during ESD or inductive kick events. Use Value: Limits peak voltage to ≤4.1 V while dissipating <100 mJ per event, preserving I/O integrity. |
| Temperature-Stable Bias Network | Calibration Reference |
Use Scenario: Biasing of precision op-amp input stages in analog front-ends for industrial sensors. IC Role / Device Role / Timing Role: Low-drift DC reference source compensating for amplifier offset drift over temperature. Use Value: Delivers <50 ppm/°C effective TC when combined with matched resistor dividers in Wheatstone bridge interfaces. |
Use Scenario: Factory calibration point in handheld test equipment requiring traceable 3.9 V reference. IC Role / Device Role / Timing Role: Primary voltage standard against which ADC full-scale and gain are adjusted during production test. Use Value: Enables 12-bit accuracy calibration with <±0.5 LSB error contribution from reference instability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | Same 3.3 V nominal rating but ±5% tolerance; 1.0 W rating; DO-41 package; higher ZZ (10 Ω @ 76 mA) | Higher test current shifts regulation point; less stable at low bias currents (<5 mA) | Select when higher power margin at elevated IZ is required, not for low-current references |
| BZX55C3V9 | Same 3.9 V rating and ±5% tolerance; 500 mW rating; DO-35 glass package; ZZ = 90 Ω @ 5 mA | Lower power rating limits sustained dissipation; smaller DO-35 body reduces thermal mass | Choose for space-constrained layouts where 0.5 W suffices and footprint reduction is critical |
Compared with BZX85C3V9_T50R, the 1N4728A offers higher current capability but poorer low-current regulation, while the BZX55C3V9 trades power and thermal performance for smaller size-making BZX85C3V9_T50R optimal for general-purpose 1 W shunt regulation where stability at 1–10 mA is essential.
Availability
BZX85C3V9_T50R is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage protection, and analog biasing applications requiring stable component supply across automotive, industrial control, and consumer electronics programs.
Supply support for BZX85C3V9_T50R 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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX85 series belongs to onsemi's general-purpose Zener diode product line, designed specifically for cost-effective, reliable voltage regulation and clamping in high-volume, through-hole assembled electronics.
FAQ
What is the exact Zener voltage range for BZX85C3V9_T50R?
The BZX85C3V9_T50R has a guaranteed Zener voltage range of 3.7 V to 4.1 V at 1 mA test current, per its ±5% tolerance specification. This range remains valid across the full −65°C to +200°C operating temperature span, with typical variation of ±0.02%/°C beyond 25°C ambient. The BZX85C3V9_T50R achieves this stability using a diffusion-controlled silicon junction optimized for low-noise regulation.
Can BZX85C3V9_T50R be used in surface-mount designs?
No, the BZX85C3V9_T50R is exclusively offered in the axial DO-41 glass package and is not compatible with SMT reflow or pick-and-place processes. Its leads require through-hole mounting and wave or hand soldering. For SMT equivalents, consider the MMBZ5227B (SOT-23, 3.9 V) or NZ9F3V9 (SOD-123), both of which maintain similar electrical specs but differ in thermal performance and layout requirements compared to the BZX85C3V9_T50R.
What is the maximum allowable reverse voltage before breakdown for BZX85C3V9_T50R?
The BZX85C3V9_T50R exhibits sharp reverse breakdown starting at approximately 3.7 V, with full regulation established by 4.1 V at 1 mA. Below 3.7 V, leakage remains ≤5 μA at 1 V reverse bias. Applying >4.1 V without current limiting risks thermal runaway, as the device lacks intrinsic current-limiting capability-external series resistance must be sized to keep power within 1.0 W at worst-case input conditions for safe BZX85C3V9_T50R operation.
How does the DO-41 package affect thermal performance of BZX85C3V9_T50R?
The DO-41 glass package of the BZX85C3V9_T50R delivers a junction-to-ambient thermal resistance (RθJA) of ~150°C/W in free air, enabling 1.0 W dissipation only at ≤25°C ambient. Above 50°C, power must be linearly derated at 6.67 mW/°C. Mounting on copper pour or adding heatsinking leads can reduce RθJA by up to 40%, but the BZX85C3V9_T50R's glass body limits direct thermal interface options compared to plastic-packaged alternatives.
Is BZX85C3V9_T50R suitable for precision voltage reference applications?
The BZX85C3V9_T50R is appropriate for moderate-precision applications (±2% system-level accuracy) but not for high-precision references requiring <0.1% stability. Its ±5% VZ tolerance, 60 Ω dynamic impedance, and ~0.02%/°C temperature coefficient limit absolute accuracy. For precision uses, the BZX85C3V9_T50R should be paired with trimming resistors or used in closed-loop feedback-not as a standalone reference. Higher-grade alternatives like the LM4040 series offer <0.1% initial accuracy and <20 ppm/°C TC.
BZX85C3V9_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
BZX85C3V9_T50R FAQ
1.How can I place an order for BZX85C3V9_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C3V9_T50R 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 BZX85C3V9_T50R reliable?
The price and inventory of BZX85C3V9_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C3V9_T50R is usually 5 days.
3.What payment methods are accepted for BZX85C3V9_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C3V9_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C3V9_T50R?
BZX85C3V9_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C3V9_T50R 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 BZX85C3V9_T50R?
For technical support, including BZX85C3V9_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C3V9_T50R requirements.
6.How does Aetrix verify that BZX85C3V9_T50R is sourced from the original manufacturer or authorized distributors?
All BZX85C3V9_T50R 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 BZX85C3V9_T50R meets industry standards.
7.What is the process for return or replacement of BZX85C3V9_T50R?
All BZX85C3V9_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C3V9_T50R, 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 BZX85C3V9_T50R part is unused and in its original packaging.
Return procedure for BZX85C3V9_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C3V9_T50R Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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