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onsemi 1N750A_T50R
- Part No.:
- 1N750A_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N750A_T50R.pdf
- Description:
- DIODE ZENER 4.7V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:9,638
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Product details
Overview
1N750A_T50R from Fairchild Semiconductor is a 4.7 V ±5% silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 19 Ω dynamic impedance at 20 mA and 30 µA reverse leakage at 1 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the 1N750A_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, cathode-band polarity marking, and DO-35 mechanical compatibility with through-hole PCB layouts.
Technical Context
This device operates as a two-terminal voltage-regulating diode relying on controlled reverse breakdown. Its 4.7 V nominal zener voltage is specified at 20 mA test current with ±5% tolerance, and its 19 Ω dynamic impedance ensures stable regulation under small-signal load variations.
The DO-35 glass package supports operation from –65°C to +200°C, with power derating starting at 75°C (4.0 mW/°C), and features a visible cathode band for unambiguous polarity identification during manual assembly or inspection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.47–4.94 V at IZ = 20 mA; defines precise clamping threshold for reference or protection circuits |
| Dynamic Impedance (ZZ) | 19 Ω max at IZ = 20 mA; determines regulation stiffness against current fluctuations |
| Max Reverse Leakage (IR) | 30 µA at VR = 1 V; limits standby current in high-impedance bias networks |
| Power Dissipation (PD) | 500 mW at TL ≤ 75°C; sets absolute thermal limit for continuous DC operation |
| Operating Temp Range | –65°C to +200°C; enables use in automotive under-hood or industrial high-temp environments |
| Tolerance | ±5%; guarantees voltage accuracy without post-selection or trimming |
| Forward Voltage (VF) | ≤1.5 V at IF = 200 mA; supports bidirectional transient suppression when used with series resistor |
Pinout & Package
DO-35 glass axial-leaded package with cathode identified by a single black band near one end; leads are tinned copper, 3/8″ length standard per JEDEC DO-35 outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener breakdown return path | Connected to lower-potential node in shunt regulator or clamp configuration |
| Cathode | Zener breakdown output terminal / Reference voltage node | Marked with black band; delivers regulated 4.7 V when reverse-biased above breakdown |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Eliminates need for binning or external trimming in cost-sensitive voltage reference designs |
| DO-35 glass package | Provides hermetic sealing and stable long-term parameter drift for reliability-critical applications |
| 19 Ω dynamic impedance | Enables <10 mV output variation across ±5 mA load current changes in shunt regulator topologies |
| 30 µA IR @ 1 V | Minimizes quiescent current draw in battery-powered sensor biasing and signal conditioning stages |
| –65°C to +200°C rating | Supports deployment in engine control units, downhole tools, and industrial motor drives without derating penalties |
Applications
| Automotive Sensor Biasing | Industrial Analog Signal Clamping |
|---|---|
Use Scenario: Providing stable 4.7 V reference for RTD or thermistor bridge excitation in engine coolant temperature modules. IC Role / Device Role / Timing Role: Shunt voltage reference diode establishing fixed bias point for ratiometric measurement circuits. Use Value: ±5% VZ tolerance and low 19 Ω ZZ ensure <±0.5% reference error contribution across temperature and supply variation. |
Use Scenario: Limiting op-amp input voltage swing to prevent rail-to-rail saturation in 4–20 mA transmitter front-ends. IC Role / Device Role / Timing Role: Passive overvoltage clamp protecting precision instrumentation amplifier inputs. Use Value: 4.7 V breakdown threshold and 30 µA leakage at 1 V minimize loading on high-Z sensor outputs. |
| Low-Power MCU Reset Circuit | Legacy Power Supply Regulation |
Use Scenario: Generating clean reset threshold for 5 V microcontrollers in energy-harvesting wireless nodes. IC Role / Device Role / Timing Role: Zener-based reset supervisor element defining valid supply-on voltage level. Use Value: Stable 4.7 V regulation with <100 ppm/°C TC enables reliable reset assertion across –40°C to +85°C ambient. |
Use Scenario: Regulating auxiliary 4.7 V rail for analog comparators and LED drivers in legacy AC/DC adapters. IC Role / Device Role / Timing Role: Discrete shunt regulator replacing integrated LDO where cost and simplicity dominate. Use Value: 500 mW power rating and DO-35 footprint allow direct replacement of obsolete 1N750A variants without board redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N750A (ON Semiconductor) | Identical VZ, ZZ, and DO-35 package; same ±5% tolerance but IR = 2 µA @ 1 V (lower leakage) | Better suited for ultra-low-power bias networks where sub-5 µA leakage is critical | Select 1N750A_T50R for legacy Fairchild sourcing continuity; choose ON Semi 1N750A only if leakage reduction justifies dual-source qualification |
| BZX55-C4V7 (Vishay) | Same 4.7 V nominal, ±5% tolerance, DO-35 package; ZZ = 20 Ω (vs. 19 Ω), PD = 500 mW, TJ = –65°C to +175°C (vs. +200°C) | Approved for AEC-Q200 stress testing; preferred for new automotive designs requiring qualification evidence | Use BZX55-C4V7 when AEC-Q200 compliance documentation is mandatory; retain 1N750A_T50R for non-automotive industrial reuse |
Compared with ON Semiconductor's 1N750A and Vishay's BZX55-C4V7, the 1N750A_T50R offers identical electrical regulation performance and DO-35 form factor but provides superior high-temperature capability (+200°C vs. +175°C) and established legacy design-in history in Fairchild-based systems.
Availability
1N750A_T50R is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog signal clamping, and low-power MCU reset circuits requiring stable component supply and long-term obsolescence management.
Supply support for 1N750A_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; known for robust, industry-standard device families.
The 1N750A_T50R belongs to Fairchild's legacy 1N7xxA Zener diode series designed for general-purpose voltage regulation and protection in cost-sensitive, high-reliability industrial and automotive applications.
FAQ
What is the exact zener voltage range for 1N750A_T50R at 20 mA?
The 1N750A_T50R has a guaranteed zener voltage range of 4.47 V to 4.94 V when tested at 20 mA and 25°C ambient, reflecting its ±5% tolerance specification. This range remains valid across its full operating temperature span due to inherent process-controlled doping uniformity, and is measured with thermal equilibrium at 30°C lead temperature per Fairchild Rev. D1 test conditions.
Does 1N750A_T50R have a defined forward voltage specification?
Yes, the 1N750A_T50R specifies a maximum forward voltage of 1.5 V at 200 mA forward current. This parameter supports bidirectional transient suppression use cases where the diode conducts in forward bias during negative transients, and confirms low-conduction-loss behavior consistent with standard silicon PN junction characteristics.
How is polarity marked on the 1N750A_T50R DO-35 package?
The 1N750A_T50R uses a single black cathode band on the DO-35 glass body to identify the cathode terminal. Per Fairchild marking standards, this band aligns with the third line of top-marking ("A") and corresponds to the terminal delivering the regulated 4.7 V output when reverse-biased - a critical visual cue for correct orientation during manual soldering or automated optical inspection.
What is the power derating behavior of 1N750A_T50R above 75°C?
The 1N750A_T50R derates linearly at 4.0 mW/°C above 75°C lead temperature, reducing its maximum allowable power dissipation from 500 mW at 75°C to 400 mW at 100°C and 200 mW at 125°C. This derating curve is defined in the Absolute Maximum Ratings table and must be applied using actual measured lead temperature, not ambient, to ensure safe long-term operation.
Is 1N750A_T50R suitable for use in life support devices?
No, 1N750A_T50R is not authorized for use in life support devices or systems. As stated in Fairchild's Life Support Policy, these components require express written approval for such applications. The 1N750A_T50R is intended for industrial, automotive, and consumer applications where failure does not directly endanger human life or cause catastrophic system failure.
1N750A_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):
- 4.7 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 19 Ohms
- Current - Reverse Leakage @ Vr:
- 2 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
1N750A_T50R FAQ
1.How can I place an order for 1N750A_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N750A_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 1N750A_T50R reliable?
The price and inventory of 1N750A_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N750A_T50R is usually 5 days.
3.What payment methods are accepted for 1N750A_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N750A_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N750A_T50R?
1N750A_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N750A_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 1N750A_T50R?
For technical support, including 1N750A_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N750A_T50R requirements.
6.How does Aetrix verify that 1N750A_T50R is sourced from the original manufacturer or authorized distributors?
All 1N750A_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 1N750A_T50R meets industry standards.
7.What is the process for return or replacement of 1N750A_T50R?
All 1N750A_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N750A_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 1N750A_T50R part is unused and in its original packaging.
Return procedure for 1N750A_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N750A_T50R Tags
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