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onsemi BZX79C43_T50R
- Part No.:
- BZX79C43_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C43_T50R.pdf
- Description:
- DIODE ZENER 43V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,740
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Product details
Overview
BZX79C43_T50R from ON Semiconductor is a 43 V, 5% tolerance, 500 mW DO-35 glass-case Zener diode optimized for voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and precision biasing networks. It delivers stable Zener voltage at 5 mA test current with 150 Ω dynamic impedance and operates across –65°C to +200°C.
For engineers reviewing the BZX79C43_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy (40–46 V), thermal coefficient (–3.5 mV/°C), leakage current (≤0.05 μA at 30.1 V), junction capacitance (21 pF at 0 V), and DO-35 mechanical compatibility in space-constrained analog designs.
Technical Context
The BZX79C43_T50R functions as a two-terminal voltage reference device operating in reverse breakdown mode. Its Zener voltage is specified at 5 mA (IZ), with a maximum dynamic impedance of 150 Ω and a negative temperature coefficient of –3.5 mV/°C - indicating decreasing voltage with rising temperature.
It is rated for 500 mW power dissipation at lead temperature ≤75°C, derating linearly at 4.0 mW/°C above that threshold. The device meets industrial-grade reliability with an operating temperature range of –65°C to +200°C and uses a glass-passivated DO-35 package with cathode band marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40 V min / 46 V max at IZ = 5 mA - defines usable regulation window under nominal bias |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling before thermal derating applies |
| Dynamic Impedance (ZZ) | 150 Ω max at IZ = 5 mA - determines output voltage stability under load variation |
| Leakage Current (IR) | ≤0.05 μA at VR = 30.1 V - ensures minimal error current in high-impedance reference paths |
| Junction Capacitance (CJ) | 21 pF at VR = 0 V, f = 1 MHz - impacts high-frequency noise rejection and transient response |
| Temperature Coefficient (TC) | –3.5 mV/°C - quantifies voltage drift per degree Celsius rise, critical for temperature-stable references |
| Package | DO-35 glass case with cathode band - enables manual or automated through-hole assembly and visual polarity identification |
Pinout & Package
DO-35 glass axial package: hermetically sealed, 2.0 mm diameter × 4.5 mm length, cathode identified by color band. Leads are tinned copper-clad steel, suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side in Zener operation | Connected to lower potential node when used in reverse-biased regulation |
| Cathode | Zener breakdown terminal / high-voltage side in Zener operation | Marked with color band; connects to regulated output or reference point |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Ensures predictable regulation within ±2.15 V of nominal 43 V, simplifying design margining |
| Negative temperature coefficient | –3.5 mV/°C enables compensation pairing with positive-TC components in precision references |
| Low leakage current | ≤0.05 μA at 30.1 V minimizes error in high-resistance divider networks and battery-powered circuits |
| DO-35 glass encapsulation | Provides hermetic sealing and long-term parameter stability in humid or corrosive environments |
| Wide operating temperature range | –65°C to +200°C supports deployment in automotive engine compartments and industrial control cabinets |
Applications
| Power Supply Regulation | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator circuits or switching power supply error amplifiers. IC Role / Device Role / Timing Role: Voltage reference element providing precise 43 V setpoint for error comparator input. Use Value: Maintains output regulation accuracy within ±5% despite input ripple and load transients due to stable Zener characteristics at 5 mA. | Use Scenario: Clamping transient surges on DC rails in industrial sensors and motor drives. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground when rail exceeds 43 V. Use Value: Limits peak voltage to ≤46 V (max VZ) with fast response and no external control logic required. |
| Reference Voltage Source | Signal Level Translation |
Use Scenario: Generating stable bias points for op-amp comparators or ADC reference dividers. IC Role / Device Role / Timing Role: Precision DC reference node in analog signal conditioning chains. Use Value: Delivers <0.05 μA leakage and 150 Ω ZZ, minimizing loading error and drift in high-impedance networks. | Use Scenario: Shifting logic-level signals between incompatible voltage domains (e.g., 48 V to 5 V interface). IC Role / Device Role / Timing Role: Clamp diode establishing upper voltage limit for level-shifter input stage. Use Value: Prevents damage to downstream 5 V logic by clamping at 43 V with DO-35's robust surge capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | Same 43 V nominal rating, 5% tolerance, but DO-41 package (larger footprint, higher PD = 1 W) | Suitable for higher-power regulation where thermal mass matters; not drop-in due to larger DO-41 body and longer leads | Select when >500 mW dissipation or enhanced thermal robustness is required |
| BZX55C43 | Same 43 V / 5% spec, but older BZX55 series with higher ZZ (200 Ω max) and wider temp range (–65°C to +175°C) | Acceptable for legacy designs or cost-sensitive volume production; slightly less stable regulation than BZX79C43_T50R | Choose for backward compatibility or where 150 Ω ZZ is not critical |
Compared with 1N4749A and BZX55C43, the BZX79C43_T50R offers tighter dynamic impedance (150 Ω vs. 200 Ω/-), smaller DO-35 footprint for dense PCB layouts, and superior high-temperature operation up to +200°C - making it optimal for compact, thermally demanding analog references.
Availability
BZX79C43_T50R is available at Aetrix Electronics and suitable for power supply regulation, overvoltage protection, and precision reference voltage generation requiring stable component supply across automotive, industrial control, and instrumentation programs.
Supply support for BZX79C43_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
ON Semiconductor (now part of onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX79C43_T50R belongs to the BZX79C2V4–BZX79C56 family of general-purpose Zener diodes designed for reliable voltage regulation and reference in cost-sensitive, high-volume analog circuits with stringent thermal and stability requirements.
FAQ
What is the Zener voltage tolerance of the BZX79C43_T50R?
The BZX79C43_T50R has a ±5% Zener voltage tolerance, meaning its measured breakdown voltage falls between 40 V and 46 V when tested at 5 mA. This tolerance is guaranteed across the full operating temperature range and is marked on the device as "43" in the third line of its DO-35 top marking. The BZX79C43_T50R maintains this specification without requiring external calibration or trimming.
Does the BZX79C43_T50R have a positive or negative temperature coefficient?
The BZX79C43_T50R exhibits a negative temperature coefficient of –3.5 mV/°C, meaning its Zener voltage decreases as junction temperature increases. This behavior is consistent across the BZX79C2V4–BZX79C56 family for devices rated ≥4.7 V. The BZX79C43_T50R's TC value is specified in the Electrical Characteristics table and must be accounted for in temperature-critical reference designs.
What is the maximum power dissipation for the BZX79C43_T50R at 100°C lead temperature?
At a lead temperature of 100°C, the BZX79C43_T50R's power dissipation is derated from its 500 mW rating at ≤75°C. Using the 4.0 mW/°C derating factor, the allowable power is 500 mW – (100°C – 75°C) × 4.0 mW/°C = 400 mW. This value ensures safe operation without exceeding junction temperature limits, and applies specifically to the BZX79C43_T50R in standard DO-35 mounting with 3/8″ lead length.
Can the BZX79C43_T50R be used in surface-mount designs?
No - the BZX79C43_T50R is packaged exclusively in the through-hole DO-35 glass axial case and is not compatible with SMT reflow or pick-and-place processes. It requires axial lead insertion and wave/hand soldering. For surface-mount equivalents, consider the MMBZ5262B (SOT-23, 43 V) or BZT52-B43 (SOD-123), but note these differ in ZZ, leakage, and thermal performance versus the BZX79C43_T50R.
What is the typical junction capacitance of the BZX79C43_T50R at zero bias?
The BZX79C43_T50R has a typical junction capacitance of 21 pF measured at VR = 0 V and f = 1 MHz, as specified in the manufacturer's datasheet. This value directly affects high-frequency noise filtering and transient response in regulation circuits. The BZX79C43_T50R's CJ remains stable across its rated voltage range and is confirmed under standardized test conditions using 1 MHz AC signal injection.
BZX79C43_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 100 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
BZX79C43_T50R FAQ
1.How can I place an order for BZX79C43_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C43_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 BZX79C43_T50R reliable?
The price and inventory of BZX79C43_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C43_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C43_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C43_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C43_T50R?
BZX79C43_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C43_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 BZX79C43_T50R?
For technical support, including BZX79C43_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C43_T50R requirements.
6.How does Aetrix verify that BZX79C43_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C43_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 BZX79C43_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C43_T50R?
All BZX79C43_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C43_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 BZX79C43_T50R part is unused and in its original packaging.
Return procedure for BZX79C43_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C43_T50R Tags
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