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onsemi BZX85C43_T50R
- Part No.:
- BZX85C43_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C43_T50R.pdf
- Description:
- DIODE ZENER 43V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:5,356
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Product details
Overview
BZX85C43_T50R from onsemi is a 43 V ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, with zener impedance of 6 Ω at 50 mA and leakage current ≤0.25 μA at 30 V, used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the BZX85C43_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, power derating above 50°C (6.67 mW/°C), thermal resistance (150°C/W), and cathode-band polarity marking per JEDEC DO-41 mechanical standard.
Technical Context
This device operates as a two-terminal voltage reference, maintaining stable reverse-biased conduction at its nominal 43 V zener voltage when current exceeds the knee point (IZK = 50 mA). It exhibits low dynamic impedance (6 Ω) under rated test conditions and supports operation across -65°C to +200°C junction temperature range.
The DO-41 glass package provides hermetic sealing and thermal performance suitable for industrial-grade power regulation. Its 1.0 W power rating at 25°C ambient is derated linearly above 50°C, enabling predictable thermal design in compact PCB layouts without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40 V min / 46 V max at IZ = 50 mA - defines regulated output voltage window for feedback or clamp use |
| Zener Impedance (ZZ) | 6 Ω at IZ = 50 mA - ensures minimal output voltage variation under load transients |
| Power Dissipation (PD) | 1.0 W at TA = 25°C - sets maximum continuous power handling before thermal shutdown risk |
| Leakage Current (IR) | ≤0.25 μA at VR = 30 V - guarantees negligible standby current in high-impedance bias networks |
| Operating Temp Range | -65°C to +200°C - supports deployment in automotive engine compartments and industrial motor drives |
| Thermal Derating | 6.67 mW/°C above 50°C - enables accurate power budgeting for elevated ambient environments |
| Forward Voltage (VF) | 1.2 V max at IF = 200 mA - defines forward conduction loss during transient surge events |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single color band on the body; leads are tinned copper alloy, 3/8″ length standard for thermal testing per JEDEC DO-204AL.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to lower potential node in zener regulation | Accepts forward current up to 200 mA; must be routed with adequate trace width for thermal dissipation |
| Cathode | Negative terminal in forward bias; connected to higher potential node in zener regulation | Marked by color band; carries reverse current during regulation; requires proper grounding or reference connection |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener Voltage Tolerance | Enables tight regulation without post-production trimming in cost-sensitive power supplies |
| Low Zener Impedance (6 Ω) | Minimizes output voltage deviation under varying load currents in feedback paths |
| Hermetic Glass DO-41 Package | Ensures long-term reliability and moisture resistance in harsh industrial environments |
| Wide Operating Temperature Range | Supports uninterrupted function in under-hood automotive and outdoor telecom applications |
| Controlled Leakage Current | Reduces quiescent power loss in battery-backed or energy-harvesting systems |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold in secondary-side control circuitry. Use Value: Maintains ±1.5% output accuracy across line/load/temperature with 6 Ω dynamic impedance limiting gain error. |
Use Scenario: Clamps transient surges on 36–48 V DC bus lines in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Two-terminal shunt protector diverting excess energy to ground during ESD or inductive kick events. Use Value: Limits peak voltage to ≤46 V with <0.25 μA leakage, preserving downstream MOSFET gate integrity. |
| Reference Voltage Generator | Temperature-Stable Bias Network |
Use Scenario: Provides stable 43 V reference for analog-to-digital converter input scaling in data acquisition front-ends. IC Role / Device Role / Timing Role: Precision voltage source establishing known full-scale input range for 16-bit ADCs. Use Value: Delivers <10 ppm/°C effective tempco via matched thermal design and low ZZ, reducing calibration drift. |
Use Scenario: Biases high-voltage op-amp stages in sensor signal conditioning circuits operating at 40–50 V rails. IC Role / Device Role / Timing Role: Stable DC bias node generator compensating for transistor VBE shift over temperature. Use Value: Enables <±0.5% bias stability from -40°C to +125°C using inherent zener tempco compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | 43 V nominal, ±5%, 1.0 W, DO-41, but higher ZZ = 9 Ω at 50 mA and IR = 5 μA at 30 V | Less suitable for low-leakage bias networks; acceptable in general-purpose clamping where leakage <5 μA is tolerable | Select when legacy footprint compatibility is required and tighter leakage is not critical |
| MMSZ43ET1G | 43 V nominal, ±5%, 500 mW SOD-123 surface-mount package, ZZ = 100 Ω at 1 mA - not rated at 50 mA | Not interchangeable in high-current regulation; limited to low-power bias or sensing roles due to power and impedance limits | Choose only for space-constrained PCBs where 1.0 W dissipation is unnecessary and 100 Ω impedance is acceptable |
Compared with 1N4749A and MMSZ43ET1G, BZX85C43_T50R delivers superior leakage performance (0.25 μA vs. 5 μA or unspecified), lower dynamic impedance (6 Ω vs. 9 Ω or 100 Ω), and full 1.0 W capability - making it optimal for industrial power regulation where stability and thermal margin are critical.
Availability
BZX85C43_T50R is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, precision reference generators, and temperature-stable bias networks requiring stable component supply and long-lifecycle support.
Supply support for BZX85C43_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, sensor, and logic solutions for automotive, industrial, cloud, and consumer markets.
The BZX85C series is part of onsemi's discrete Zener diode portfolio designed specifically for robust, high-reliability voltage regulation and transient suppression in demanding industrial and automotive power systems.
FAQ
What is the zener voltage tolerance for BZX85C43_T50R?
The BZX85C43_T50R has a zener voltage tolerance of ±5%, meaning its actual breakdown voltage falls between 40 V and 46 V when tested at 50 mA. This tolerance is specified per the onsemi BZX85C3V3–BZX85C56 datasheet Rev. 2 (October 2017), and applies directly to the BZX85C43_T50R variant. Tight tolerance enables consistent regulation without external trimming in production designs.
Does BZX85C43_T50R support operation at elevated temperatures?
Yes, BZX85C43_T50R is rated for junction and storage temperatures from -65°C to +200°C. Its power dissipation is derated linearly at 6.67 mW/°C above 50°C ambient, allowing safe operation up to 150°C case temperature with appropriate heatsinking. This makes BZX85C43_T50R suitable for under-hood automotive and industrial motor drive applications where thermal margins are constrained.
What is the zener impedance of BZX85C43_T50R and why does it matter?
The zener impedance (ZZ) of BZX85C43_T50R is 6 Ω measured at 50 mA test current. This low value indicates minimal change in regulated voltage under varying load conditions - critical for maintaining accuracy in feedback loops and reference circuits. Higher impedance would cause greater output deviation during current transients, degrading system stability and measurement fidelity in the BZX85C43_T50R application.
How is cathode polarity marked on the BZX85C43_T50R package?
The cathode of BZX85C43_T50R is marked by a single color band on the glass body of its DO-41 axial package. This band aligns with JEDEC DO-204AL mechanical standards and corresponds to the cathode terminal - the terminal that connects to the higher-potential node during reverse-biased zener operation. Correct orientation is essential to avoid forward conduction failure in regulation circuits using BZX85C43_T50R.
Is BZX85C43_T50R suitable for low-leakage bias applications?
Yes, BZX85C43_T50R specifies leakage current ≤0.25 μA at 30 V reverse voltage, making it well-suited for low-power bias networks, battery-operated sensors, and high-impedance reference nodes. This leakage performance is significantly lower than alternatives like 1N4749A (5 μA), ensuring minimal quiescent current draw and improved long-term stability in the BZX85C43_T50R implementation.
BZX85C43_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):
- 43 V
- Tolerance:
- ±7%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 50 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 30 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
BZX85C43_T50R FAQ
1.How can I place an order for BZX85C43_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C43_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 BZX85C43_T50R reliable?
The price and inventory of BZX85C43_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C43_T50R is usually 5 days.
3.What payment methods are accepted for BZX85C43_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C43_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C43_T50R?
BZX85C43_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C43_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 BZX85C43_T50R?
For technical support, including BZX85C43_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C43_T50R requirements.
6.How does Aetrix verify that BZX85C43_T50R is sourced from the original manufacturer or authorized distributors?
All BZX85C43_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 BZX85C43_T50R meets industry standards.
7.What is the process for return or replacement of BZX85C43_T50R?
All BZX85C43_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C43_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 BZX85C43_T50R part is unused and in its original packaging.
Return procedure for BZX85C43_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C43_T50R Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
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
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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