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onsemi 1N747A_T50R
- Part No.:
- 1N747A_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N747A_T50R.pdf
- Description:
- DIODE ZENER 3.6V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:9,468
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Product details
Overview
1N747A_T50R from Fairchild Semiconductor is a 3.6 V ±5% silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 24 Ω dynamic impedance at 20 mA and 10 µA reverse leakage at 1 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the 1N747A_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, cathode band identification, and compatibility with through-hole PCB layouts requiring stable 3.6 V regulation under 20 mA test current.
Technical Context
This device operates as a two-terminal voltage reference diode relying on controlled reverse-biased avalanche breakdown. Its 3.6 V nominal zener voltage is specified at 20 mA test current with ±5% tolerance, and its 24 Ω dynamic impedance directly determines output voltage stability under varying load currents.
The DO-35 glass package enables operation across –65°C to +200°C junction temperature range, with power derating starting at 75°C (4.0 mW/°C), and cathode identification via a single axial color band - critical for correct polarity orientation in shunt regulator and clamp configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ @ IZ = 20mA | 3.6 V nominal, ±5% tolerance - defines regulated output voltage in shunt configuration at standard test condition |
| ZZ @ IZ = 20mA | 24 Ω - quantifies voltage change per mA of current variation; lower value improves regulation accuracy |
| PD @ TL ≤ 75°C | 500 mW - maximum continuous power dissipation before thermal derating begins |
| IR @ VR = 1V | 10 µA - reverse leakage magnitude at sub-zener bias; impacts standby current in low-power designs |
| TJ Range | –65°C to +200°C - wide operating temperature span supports industrial and automotive under-hood applications |
| Package | DO-35 glass axial - industry-standard through-hole package with cathode band marking |
Pinout & Package
DO-35 glass axial package with cathode identified by a single color band on the body; leads are unmarked anode/cathode terminals, with cathode terminal electrically connected to the banded end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node in shunt regulator | Connected to circuit ground or lower-potential node; carries forward current up to 200 mA (VF ≤ 1.5 V) |
| Cathode | Zener breakdown terminal / Regulated output node | Connected to input supply via series resistor; maintains 3.6 V relative to anode when reverse-biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables predictable 3.6 V regulation without post-manufacture trimming in cost-sensitive analog references |
| DO-35 glass construction | Provides hermetic sealing and high-temperature reliability up to +200°C junction temperature |
| 500 mW power rating | Supports stable operation in low-to-medium power shunt regulators without heatsinking |
| Cathode band marking | Ensures unambiguous polarity identification during manual or automated assembly |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Voltage Reference |
|---|---|
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing 3.6 V bias to Wheatstone bridge, absorbing excess current via series resistor. Use Value: Tight ±5% VZ tolerance ensures consistent sensor gain calibration across production batches without individual trimming. | Use Scenario: Supplying precise reference voltage to ADC inputs of battery-powered IoT edge nodes. IC Role / Device Role / Timing Role: Low-current zener clamp establishing stable 3.6 V reference for 12-bit SAR ADC conversion. Use Value: 10 µA IR at 1 V minimizes quiescent current draw, extending coin-cell battery life beyond 5 years. |
| Overvoltage Clamp in RS-232 Interface | Power Supply Rail Clamp in Automotive Body Control Module |
Use Scenario: Protecting UART transceiver inputs against ESD-induced transients on legacy serial lines. IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverting >2 kV HBM spikes away from IC pins using 3.6 V breakdown threshold. Use Value: DO-35 glass package withstands repeated transient events without parameter shift due to hermetic seal integrity. | Use Scenario: Clamping 5 V logic rail against load-dump surges in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Standby-mode zener suppressor holding rail voltage below 3.9 V (VZ max) during 200 ms surge events. Use Value: –65°C to +200°C TJ range ensures reliable clamping performance across cold-cranking and under-hood thermal extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4729A | 3.6 V nominal, ±5%, 1.0 W power rating, DO-41 package | Higher power handling but larger footprint; requires different PCB pad layout | Select when higher surge energy absorption or extended thermal margin is required |
| BZX55-C3V6 | 3.6 V nominal, ±5%, 500 mW, DO-35 package, tighter 2 µA IR @ VR = 1 V | Lower leakage enables ultra-low-power applications; same mechanical form factor | Select when sub-5 µA reverse leakage is mandatory for battery-operated systems |
Compared with 1N747A_T50R, 1N4729A offers greater power capacity in a larger package, while BZX55-C3V6 matches the DO-35 footprint but delivers significantly lower leakage - making it preferable for energy-constrained designs where 1N747A_T50R's 10 µA IR may impact system sleep current.
Availability
1N747A_T50R is available at Aetrix Electronics and suitable for industrial sensor conditioning, low-power microcontroller reference, and RS-232 overvoltage protection requiring stable component supply and long-term obsolescence management.
Supply support for 1N747A_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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The 1N747A_T50R belongs to Fairchild's legacy 1N7xxA Zener diode family, designed for general-purpose voltage regulation and clamping in cost-sensitive, through-hole assembled industrial and consumer electronics.
FAQ
What is the nominal zener voltage and tolerance of the 1N747A_T50R?
The 1N747A_T50R has a nominal zener voltage of 3.6 V with a ±5% tolerance, measured at 20 mA test current and 25°C ambient. This means the actual VZ falls between 3.42 V and 3.78 V under those conditions. The tolerance is guaranteed across the full operating temperature range and is marked on the device body as "47A" in the third line of top marking.
What is the maximum power dissipation and thermal derating behavior of the 1N747A_T50R?
The 1N747A_T50R is rated for 500 mW power dissipation at lead temperature ≤ 75°C with 3/8″ lead length. Above 75°C, it derates linearly at 4.0 mW/°C. At 125°C lead temperature, the usable power drops to 300 mW. This derating curve must be applied in PCB layouts with limited copper area or elevated ambient temperatures.
How is cathode polarity identified on the 1N747A_T50R package?
The 1N747A_T50R uses a DO-35 glass axial package with a single color band (typically black or dark gray) denoting the cathode terminal. The banded end connects to the cathode; the opposite end is the anode. This marking complies with JEDEC standards and is visible under standard visual inspection or AOI systems.
What is the reverse leakage current specification for the 1N747A_T50R?
The 1N747A_T50R exhibits a maximum reverse leakage current (IR) of 10 µA when biased at VR = 1 V and TA = 25°C. At elevated temperatures (125°C), IR increases to 30 µA. This parameter directly affects quiescent current in always-on reference circuits and must be accounted for in battery-life calculations.
Is the 1N747A_T50R suitable for automotive under-hood applications?
Yes, the 1N747A_T50R supports junction temperatures from –65°C to +200°C and is constructed in a hermetically sealed DO-35 glass package, making it suitable for under-hood automotive environments. However, system-level validation is required for specific surge, vibration, and lifetime requirements - the 1N747A_T50R itself meets the base thermal and reliability envelope.
1N747A_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):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 24 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N747A_T50R FAQ
1.How can I place an order for 1N747A_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N747A_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 1N747A_T50R reliable?
The price and inventory of 1N747A_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N747A_T50R is usually 5 days.
3.What payment methods are accepted for 1N747A_T50R?
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1N747A_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N747A_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 1N747A_T50R?
For technical support, including 1N747A_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N747A_T50R requirements.
6.How does Aetrix verify that 1N747A_T50R is sourced from the original manufacturer or authorized distributors?
All 1N747A_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 1N747A_T50R meets industry standards.
7.What is the process for return or replacement of 1N747A_T50R?
All 1N747A_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N747A_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 1N747A_T50R part is unused and in its original packaging.
Return procedure for 1N747A_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N747A_T50R Tags
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