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onsemi 1N4740A-T50A
- Part No.:
- 1N4740A-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4740A-T50A.pdf
- Description:
- DIODE ZENER 10V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:5,651
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Product details
Overview
1N4740A-T50A from ON Semiconductor is a 10 V, 1 W silicon Zener diode in DO-41 glass package, designed for precision voltage regulation and reference applications at 25 mA test current, with 25 Ω dynamic impedance, ±5% tolerance, and operation from –65 °C to +200 °C - used in power supply feedback loops and analog voltage references.
For engineers reviewing the 1N4740A-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy (9.5–10.5 V), thermal derating (6.67 mW/°C above 50 °C), peak reverse surge capability (454 mA), and DO-41 mechanical compatibility in board-level voltage clamping and regulation circuits.
Technical Context
This device operates as a two-terminal, reverse-biased silicon junction diode optimized for stable breakdown conduction. Its zener voltage is specified at IZ = 25 mA with 25 Ω impedance at that current, and it maintains regulation down to IZK = 7 mA where impedance rises to 500 Ω.
The 1N4740A-T50A exhibits low leakage (<0.25 µA at 7.6 V), supports non-repetitive peak reverse currents up to 454 mA (8.3 ms square wave), and is rated for 1.0 W power dissipation at lead temperature ≤50 °C - requiring thermal management in continuous high-current operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.5–10.5 V at IZ = 25 mA - defines nominal regulation point with ±5% tolerance for stable reference generation |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50 °C - sets maximum continuous DC power handling before thermal derating begins |
| Zener Impedance (ZZ) | 25 Ω @ IZ = 25 mA - indicates small-signal AC resistance affecting regulation stability under load transients |
| Test Current (IZ) | 25 mA - standardized operating point for VZ measurement and impedance specification |
| Leakage Current (IR) | <0.25 µA @ VR = 7.6 V - ensures minimal error current in high-impedance reference paths |
| Peak Reverse Surge (IZSM) | 454 mA (8.3 ms) - defines transient overvoltage clamping capability without damage |
| Operating Temperature | –65 °C to +200 °C - enables use in automotive under-hood, industrial, and aerospace environments |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single color band. Leads are tinned copper-clad steel; case is hermetically sealed glass with axial symmetry. Standard lead length is 3/8″ for thermal rating compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side | Connected to circuit ground or lower potential node when used in reverse-bias regulation |
| Cathode | Zener breakdown terminal / high-voltage side | Connected to unregulated input; provides stable output voltage referenced to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-assembly trimming in cost-sensitive power supplies |
| 1.0 W power rating at 50 °C lead temp | Supports robust DC voltage reference design with margin for ambient temperature rise |
| 25 Ω dynamic impedance at 25 mA | Minimizes output voltage variation under moderate load current changes (e.g., ±5 mA) |
| Low 0.25 µA leakage at 7.6 V | Preserves accuracy in high-resistance divider networks and battery-powered reference circuits |
| DO-41 glass package with cathode band | Ensures mechanical reliability and visual polarity identification during manual or automated assembly |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting precise feedback threshold for TL431 or similar shunt regulator. Use Value: 10 V nominal breakdown enables accurate scaling of secondary-side voltage to match primary controller reference, with 25 Ω impedance limiting loop gain variation. |
Use Scenario: Providing stable excitation voltage for resistive bridge sensors in factory automation systems. IC Role / Device Role / Timing Role: Precision voltage reference source for Wheatstone bridge biasing and ADC reference scaling. Use Value: ±5% tolerance and <0.25 µA leakage ensure bridge offset drift remains below 0.1% FS across –40 °C to +85 °C operating range. |
| Overvoltage Protection Clamp | Microcontroller Reset Circuit |
|
Use Scenario: Clamping transient surges on 12 V rail in automotive body control modules. IC Role / Device Role / Timing Role: Passive crowbar element diverting excess energy during load dump events. Use Value: 454 mA non-repetitive surge rating allows safe absorption of ISO 7637-2 Pulse 5a without failure, leveraging DO-41 thermal mass. |
Use Scenario: Generating clean reset signal for PIC or ARM microcontrollers during brown-out conditions. IC Role / Device Role / Timing Role: Threshold detector in RC-based reset generator with hysteresis. Use Value: Sharp 10 V breakdown onset and low leakage enable reliable reset assertion at 9.5 V while minimizing standby current drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A (DO-41, no -T50A suffix) | Identical electrical specs; -T50A denotes tape-and-reel packaging per EIA-481 standard, not performance difference | No functional difference - same regulation behavior, thermal rating, and pinout | Select 1N4740A-T50A for automated SMT placement; choose bulk 1N4740A for hand-solder prototyping |
| BZX55C10 (DO-35) | Same 10 V, ±5%, 500 mW rating; smaller DO-35 package limits power dissipation and surge handling | Not suitable for 1 W continuous or 454 mA surge applications; limited to low-power references | Choose BZX55C10 only when board space is constrained and thermal/power demands are ≤500 mW |
Compared with 1N4740A-T50A, the standard 1N4740A offers identical regulation performance but lacks tape-and-reel packaging for pick-and-place; BZX55C10 provides comparable voltage accuracy in a smaller footprint but sacrifices 50% power rating and surge capacity - making 1N4740A-T50A optimal for robust, production-ready 1 W reference designs.
Availability
1N4740A-T50A is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, and overvoltage protection circuits requiring stable component supply, consistent Zener voltage tolerance, and DO-41 mechanical compatibility.
Supply support for 1N4740A-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 energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The 1N47xxA series was developed for general-purpose, high-reliability voltage regulation - targeting cost-effective, thermally robust Zener references in legacy and new-design power conversion and protection circuits.
FAQ
What is the Zener voltage tolerance of the 1N4740A-T50A?
The 1N4740A-T50A has a Zener voltage tolerance of ±5%, meaning its breakdown voltage is guaranteed between 9.5 V and 10.5 V when tested at 25 mA. This tolerance is measured under standard conditions (TA = 25 °C, lead length = 3/8″) and applies across the full operating temperature range. The 1N4740A-T50A achieves this consistency using silicon process controls validated per ON Semiconductor's 1N4728A–1N4758A family specifications.
Can the 1N4740A-T50A be used in place of the 1N4740A?
Yes - the 1N4740A-T50A is functionally identical to the 1N4740A in all electrical and thermal specifications; the "-T50A" suffix denotes tape-and-reel packaging per EIA-481 standard, not a parametric change. Both share the same DO-41 package, 10 V Zener voltage, 1 W power rating, and 25 Ω impedance. The 1N4740A-T50A is intended for automated assembly, while bulk 1N4740A suits manual soldering.
What is the maximum non-repetitive peak reverse current for the 1N4740A-T50A?
The 1N4740A-T50A supports a non-repetitive peak reverse current (IZSM) of 454 mA under an 8.3 ms square-wave surge condition, as defined in ON Semiconductor's 1N4728A–1N4758A datasheet. This rating reflects the device's ability to safely clamp transient overvoltages without degradation, provided the surge duration and repetition rate remain within specification limits.
How does thermal derating apply to the 1N4740A-T50A?
The 1N4740A-T50A must be derated at 6.67 mW/°C above a lead temperature of 50 °C, reducing its usable power dissipation linearly - e.g., at 75 °C lead temperature, max power drops to 0.833 W. This derating is based on DO-41 package thermal resistance and requires proper PCB copper area or heatsinking to maintain safe junction temperatures within the –65 °C to +200 °C operating range.
Is the 1N4740A-T50A RoHS compliant?
Yes, the 1N4740A-T50A is RoHS compliant per ON Semiconductor's product documentation and conforms to Directive 2011/65/EU. It contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE) above threshold limits. Compliance is verified through material declarations and third-party testing aligned with ON Semiconductor's environmental policy.
1N4740A-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):
- 10 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 7.6 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4740A-T50A FAQ
1.How can I place an order for 1N4740A-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4740A-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 1N4740A-T50A reliable?
The price and inventory of 1N4740A-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4740A-T50A is usually 5 days.
3.What payment methods are accepted for 1N4740A-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4740A-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4740A-T50A?
1N4740A-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4740A-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 1N4740A-T50A?
For technical support, including 1N4740A-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4740A-T50A requirements.
6.How does Aetrix verify that 1N4740A-T50A is sourced from the original manufacturer or authorized distributors?
All 1N4740A-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 1N4740A-T50A meets industry standards.
7.What is the process for return or replacement of 1N4740A-T50A?
All 1N4740A-T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4740A-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 1N4740A-T50A part is unused and in its original packaging.
Return procedure for 1N4740A-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4740A-T50A Tags
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