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onsemi 1N4740A_T50R
- Part No.:
- 1N4740A_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4740A_T50R.pdf
- Description:
- DIODE ZENER 10V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:7,653
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Product details
Overview
1N4740A_T50R from ON Semiconductor is a 10 V, 1 W silicon Zener diode in DO-41 glass package, rated for ±5% tolerance at 25 °C with 25 Ω dynamic impedance at 25 mA test current and 0.25 μA leakage at 7.6 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in power supply regulation, analog signal conditioning, and microcontroller reset circuits.
For engineers reviewing the 1N4740A_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal derating (6.67 mW/°C above 50 °C), junction temperature range (–65 °C to +200 °C), and DO-41 mechanical compatibility in through-hole PCB designs.
Technical Context
This device operates in reverse breakdown mode with a nominal Zener voltage of 10.0 V at IZ = 25 mA, maintaining regulation across load and line variations. Its 25 Ω Zener impedance (ZZ @ IZ) ensures stable output under moderate current transients, while low 0.25 μA leakage at VR = 7.6 V supports high-impedance bias networks.
The 1N4740A_T50R is thermally rated for 1.0 W dissipation at lead temperature ≤50 °C, with linear derating to zero at 200 °C junction temperature. Its DO-41 package features axial leads and a cathode band marking, enabling direct replacement in legacy linear regulator feedback paths and voltage reference shunt configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10.0 V ±5% at IZ = 25 mA - defines regulated output voltage in shunt reference applications |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50 °C - sets maximum continuous power handling in free-air mounting |
| Zener Impedance (ZZ) | 25 Ω @ IZ = 25 mA - determines voltage deviation under load current changes |
| Leakage Current (IR) | 0.25 μA @ VR = 7.6 V - ensures minimal error in high-resistance bias networks |
| Operating Temperature | –65 °C to +200 °C - supports industrial and automotive under-hood environments |
| Thermal Derating | 6.67 mW/°C above 50 °C - enables safe operation at elevated ambient temperatures |
| Non-repetitive Peak Reverse Current | 454 mA @ 8.3 ms surge - withstands transient overvoltage events without failure |
Pinout & Package
DO-41 glass axial-leaded package with cathode indicated by a single color band on the body. Leads are tinned copper-clad steel, suitable for wave or hand soldering. Mechanical dimensions conform to JEDEC DO-41 standard: body diameter 2.0–2.7 mm, overall length 4.5–5.5 mm, lead diameter 0.4–0.6 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in shunt regulation; forms return path for Zener current |
| Cathode | Reverse breakdown terminal / regulated output node | Connected to regulated voltage rail; polarity marked by colored band on DO-41 body |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-manufacture trimming in cost-sensitive designs |
| Low 0.25 μA leakage at 7.6 V | Minimizes quiescent current error in battery-powered sensor bias networks |
| 1.0 W power rating with linear derating | Supports robust operation in unregulated DC supplies with variable load conditions |
| DO-41 glass package with axial leads | Ensures mechanical reliability and thermal stability in through-hole assembly processes |
| –65 °C to +200 °C operating range | Validates use in extended-temperature industrial control and automotive subsystems |
Applications
| Power Supply Regulation | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Stabilizing 10 V reference in linear regulator feedback loop for 5 V or 3.3 V LDO outputs. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise feedback to error amplifier. Use Value: Maintains ±5% output accuracy over temperature and line variation without external trimming components. |
Use Scenario: Generating clean, temperature-stable reset threshold for ARM Cortex-M0+ MCU during brown-out conditions. IC Role / Device Role / Timing Role: Zener-clamped voltage divider setting reset comparator trip point. Use Value: Ensures deterministic reset assertion at 7.6 V with sub-microamp leakage preserving battery life. |
| Analog Signal Clamping | Overvoltage Protection |
|
Use Scenario: Limiting op-amp input swing to ±10 V in data acquisition front-end stages. IC Role / Device Role / Timing Role: Bidirectional clamping diode pair (with series resistor) referenced to ground. Use Value: Prevents ADC saturation and op-amp phase reversal using 25 Ω low-impedance Zener knee. |
Use Scenario: Protecting CAN transceiver inputs against ISO 7637-2 pulse 1 and pulse 2 transients. IC Role / Device Role / Timing Role: Shunt clamping element diverting surge energy to ground. Use Value: Absorbs 454 mA non-repetitive peak reverse current without parametric shift or failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A (ON Semiconductor) | Same Zener voltage (10 V), identical DO-41 package, but no "_T50R" suffix - indicates standard tape-and-reel packaging vs. bulk or custom reel. | No functional difference; _T50R denotes specific reel size (500 pcs/reel) and packaging compliance per ON Semi standards. | Select 1N4740A_T50R when automated SMT placement requires verified tape-and-reel format with EIA-481 compliance. |
| BZX55C10 (Vishay) | 10 V ±5%, DO-35 package (smaller glass body, 1.8 mm max diameter), 500 mW rating, 20 Ω ZZ @ 5 mA. | Lower power rating and different thermal profile; suited for space-constrained, low-power analog circuits only. | Choose BZX55C10 only if board area is critical and power dissipation remains below 500 mW; not interchangeable in 1 W designs. |
Compared with 1N4740A_T50R, the base 1N4740A offers identical electrical performance but lacks traceable reel-level packaging data, while BZX55C10 trades power capability and thermal margin for miniaturization-making it unsuitable for high-current or high-temperature regulation roles.
Availability
1N4740A_T50R is available at Aetrix Electronics and suitable for power supply regulation, microcontroller reset circuits, analog signal clamping, and overvoltage protection requiring stable component supply and full traceability.
Supply support for 1N4740A_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 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 designed as a general-purpose, high-reliability Zener diode family for voltage reference and regulation in cost-sensitive, high-volume applications across consumer, industrial, and automotive electronics.
FAQ
What is the Zener voltage tolerance of the 1N4740A_T50R?
The 1N4740A_T50R has a Zener voltage tolerance of ±5% at 25 °C, meaning its nominal 10.0 V rating falls between 9.5 V and 10.5 V under specified test conditions (IZ = 25 mA). This tolerance is guaranteed per ON Semiconductor's 1N4728A–1N4758A datasheet Rev. 8 and applies directly to the 1N4740A_T50R variant.
Does the 1N4740A_T50R have the same electrical specifications as the standard 1N4740A?
Yes, the 1N4740A_T50R shares identical electrical specifications-including 10.0 V Zener voltage, 25 Ω impedance, 1.0 W power rating, and –65 °C to +200 °C temperature range-with the base 1N4740A. The "_T50R" suffix denotes tape-and-reel packaging (500 units per reel) compliant with EIA-481 standards, not a parametric change.
What is the maximum allowable junction temperature for the 1N4740A_T50R?
The 1N4740A_T50R has a maximum junction temperature (TJ) of +200 °C, as specified in the Absolute Maximum Ratings table of the ON Semiconductor 1N4728A–1N4758A datasheet. This rating enables operation in high-ambient environments such as engine control units or industrial motor drives when properly heatsinked or mounted with adequate lead length.
Can the 1N4740A_T50R be used in surface-mount designs?
No, the 1N4740A_T50R uses a DO-41 axial-leaded glass package intended for through-hole mounting only. It is not compatible with SMT reflow or wave soldering processes. For surface-mount equivalents, consider SOD-123 or SOD-323 packaged Zeners like MMBZ5240B, which offer similar 10 V regulation but require layout and thermal redesign.
What is the Zener impedance of the 1N4740A_T50R at its rated test current?
The Zener impedance (ZZ) of the 1N4740A_T50R is 25 Ω measured at IZ = 25 mA and TA = 25 °C, per the Electrical Characteristics table in the official ON Semiconductor datasheet. This value reflects dynamic resistance in the breakdown region and directly impacts output voltage stability under varying load currents.
1N4740A_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):
- 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_T50R FAQ
1.How can I place an order for 1N4740A_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4740A_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 1N4740A_T50R reliable?
The price and inventory of 1N4740A_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4740A_T50R is usually 5 days.
3.What payment methods are accepted for 1N4740A_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4740A_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4740A_T50R?
1N4740A_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4740A_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 1N4740A_T50R?
For technical support, including 1N4740A_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4740A_T50R requirements.
6.How does Aetrix verify that 1N4740A_T50R is sourced from the original manufacturer or authorized distributors?
All 1N4740A_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 1N4740A_T50R meets industry standards.
7.What is the process for return or replacement of 1N4740A_T50R?
All 1N4740A_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N4740A_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 1N4740A_T50R part is unused and in its original packaging.
Return procedure for 1N4740A_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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