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onsemi 1N4755A-T50A
- Part No.:
- 1N4755A-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4755A-T50A.pdf
- Description:
- DIODE ZENER 43V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
1N4755A-T50A from ON Semiconductor is a 43 V ±5% Zener diode in DO-41 glass package, rated for 1.0 W power dissipation at TL ≤ 50°C with 6.67 mW/°C derating, 25 Ω maximum Zener impedance at 39 mA test current, and 0.25 μA leakage current at 34.8 V reverse voltage. It regulates voltage in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N4755A-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal derating behavior, Zener impedance at specified IZ, peak reverse surge capability (70 mA), and DO-41 mechanical compatibility with through-hole PCB layouts.
Technical Context
The 1N4755A-T50A operates as a two-terminal voltage reference device relying on controlled reverse-biased avalanche breakdown. Its 43 V nominal Zener voltage is specified at 39 mA test current with tight 5% tolerance and 25 Ω dynamic impedance, ensuring stable regulation under moderate load variation.
Designed for operation across –65°C to +200°C junction temperature range, it supports high-reliability industrial and automotive environments. The DO-41 package enables standard lead-forming and wave-soldering processes, with cathode band marking for unambiguous polarity identification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40.85–45.15 V @ 39 mA - defines regulated output voltage window under nominal bias |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZ) | 25 Ω max @ IZ = 39 mA - determines output voltage stability against load current changes |
| Leakage Current (IR) | 0.25 μA max @ VR = 34.8 V - ensures minimal standby current in high-impedance bias networks |
| Peak Reverse Surge (IZSM) | 70 mA @ 8.3 ms - supports transient overvoltage clamping without degradation |
| Operating Temperature | –65°C to +200°C - enables use in under-hood automotive, industrial control, and aerospace environments |
| Tolerance | ±5% - guarantees predictable regulation band for precision reference design |
Pinout & Package
DO-41 glass axial package with cathode band marking; leads are non-polarized terminals requiring orientation during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower potential side in shunt regulator configuration |
| Cathode | Zener breakdown terminal / Regulated output node | Connected to input supply via series resistor; delivers stable 43 V reference to load |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage with tight tolerance | 43 V ±5% ensures consistent reference accuracy across production lots and temperature |
| Low dynamic impedance | 25 Ω max at 39 mA minimizes output voltage shift under varying load conditions |
| High surge current rating | 70 mA non-repetitive peak reverse current enables robust transient suppression |
| Wide operating temperature range | –65°C to +200°C junction rating supports deployment in extreme environmental conditions |
| Standard DO-41 footprint | Enables drop-in replacement in legacy through-hole designs and compatibility with automated insertion equipment |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Providing stable 43 V reference for linear regulator feedback or ADC reference divider networks. IC Role / Device Role / Timing Role: Shunt voltage reference element maintaining precise DC bias point. Use Value: Tight ±5% tolerance and low 25 Ω ZZ ensure <1% output error across load and temperature variations. |
Use Scenario: Clamping transient surges on 36 V automotive battery rails or industrial 48 V DC systems. IC Role / Device Role / Timing Role: Passive overvoltage clamp limiting voltage excursions above 45.15 V. Use Value: 70 mA 8.3 ms surge rating absorbs energy without parametric shift or failure. |
| Signal Level Translation | Current Source Biasing |
Use Scenario: Establishing fixed 43 V bias for op-amp input stages or comparator thresholds in sensor interfaces. IC Role / Device Role / Timing Role: Precision DC offset generator defining signal swing boundaries. Use Value: Low 0.25 μA leakage at 34.8 V prevents loading of high-impedance sensor nodes. |
Use Scenario: Setting constant current in LED driver or transistor bias circuits using series resistor + Zener configuration. IC Role / Device Role / Timing Role: Stable voltage reference enabling predictable IOUT = (VIN − 43 V)/RS. Use Value: 1.0 W power rating supports ≥23 mA constant current at 43 V with adequate thermal margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4755A-TP (Micro Commercial) | Same 43 V ±5% VZ, DO-41 package, but 20 Ω max ZZ @ 39 mA and 1.0 W rating at TL = 50°C | Lower ZZ improves regulation accuracy in high-precision references; identical thermal profile | Select when tighter dynamic regulation is required and Micro Commercial's qualification meets program requirements |
| BZX85C43 (Nexperia) | 43 V ±5% VZ, DO-41, but 1.3 W PD rating and 30 Ω max ZZ @ 35 mA; different test current | Higher power rating suits higher-current shunt applications; slightly higher impedance affects load regulation | Choose for enhanced power margin where 1.3 W continuous dissipation is needed and 30 Ω ZZ is acceptable |
Compared with 1N4755A-T50A, the 1N4755A-TP offers improved dynamic regulation (20 Ω vs. 25 Ω), while BZX85C43 provides greater power headroom (1.3 W vs. 1.0 W) at the cost of slightly reduced impedance performance - both require validation of thermal layout and leakage behavior in final design.
Availability
1N4755A-T50A is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, signal level translation, and current source biasing applications requiring stable component supply and long-term manufacturability.
Supply support for 1N4755A-T50A 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 is a global semiconductor manufacturer specializing in power management, analog, sensors, and discrete devices, with a focus on energy-efficient and reliable components.
The 1N47xxA series was developed for general-purpose voltage regulation and protection in industrial, automotive, and consumer electronics, emphasizing robustness, tight tolerance, and wide temperature operation.
FAQ
What is the nominal Zener voltage of the 1N4755A-T50A?
The 1N4755A-T50A has a nominal Zener voltage of 43 V, with a guaranteed minimum of 40.85 V and maximum of 45.15 V at 39 mA test current and 25°C ambient. This 5% tolerance band is measured under standardized thermal conditions (TL = 30°C ± 1°C, 3/8″ lead length), and the 1N4755A-T50A maintains this specification across its full operating temperature range.
What is the maximum power dissipation for the 1N4755A-T50A?
The 1N4755A-T50A is rated for 1.0 W power dissipation at lead temperature (TL) ≤ 50°C with 3/8″ lead length. Above 50°C, it derates linearly at 6.67 mW/°C. This thermal limit applies to continuous DC operation; the 1N4755A-T50A also supports 70 mA non-repetitive peak reverse current for 8.3 ms transients without permanent parameter shift.
Does the 1N4755A-T50A have a defined Zener impedance value?
Yes, the 1N4755A-T50A specifies a maximum Zener impedance (ZZ) of 25 Ω at 39 mA test current and 25°C. This value reflects dynamic resistance in the breakdown region and directly impacts regulation accuracy under varying load conditions. The 1N4755A-T50A also defines ZZK = 700 Ω at IZK = 0.25 mA for low-current knee behavior.
What is the leakage current specification for the 1N4755A-T50A?
The 1N4755A-T50A exhibits a maximum leakage current (IR) of 0.25 μA at 34.8 V reverse voltage and 25°C. This low leakage ensures minimal parasitic current draw in high-impedance reference networks and bias circuits. The 1N4755A-T50A maintains this specification across its full –65°C to +200°C operating temperature range.
Which package type does the 1N4755A-T50A use?
The 1N4755A-T50A uses the DO-41 glass axial package with a cathode band marking for polarity identification. This industry-standard through-hole package supports wave soldering, hand assembly, and automated insertion. The 1N4755A-T50A's DO-41 footprint ensures mechanical compatibility with legacy designs and existing pick-and-place tooling.
1N4755A-T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 32.7 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4755A-T50A FAQ
1.How can I place an order for 1N4755A-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4755A-T50A 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 1N4755A-T50A reliable?
The price and inventory of 1N4755A-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4755A-T50A is usually 5 days.
3.What payment methods are accepted for 1N4755A-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4755A-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4755A-T50A?
1N4755A-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4755A-T50A 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 1N4755A-T50A?
For technical support, including 1N4755A-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4755A-T50A requirements.
6.How does Aetrix verify that 1N4755A-T50A is sourced from the original manufacturer or authorized distributors?
All 1N4755A-T50A 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 1N4755A-T50A meets industry standards.
7.What is the process for return or replacement of 1N4755A-T50A?
All 1N4755A-T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4755A-T50A, 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 1N4755A-T50A part is unused and in its original packaging.
Return procedure for 1N4755A-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4755A-T50A Tags
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