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onsemi 1N4370A_T50R
- Part No.:
- 1N4370A_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4370A_T50R.pdf
- Description:
- DIODE ZENER 2.4V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,069
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Product details
Overview
1N4370A_T50R from Fairchild Semiconductor is a 2.4 V ±5% silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 30 Ω dynamic impedance at 20 mA and 100 µA reverse leakage at 1 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the 1N4370A_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), thermal derating slope (4.0 mW/°C above 75°C), cathode band marking, and DO-35 mechanical compatibility with legacy through-hole designs.
Technical Context
The 1N4370A_T50R operates as a two-terminal voltage-regulating diode with sharp reverse breakdown at nominal 2.4 V, specified under thermal equilibrium conditions at lead temperature TL = 30°C ±1°C and 3/8″ lead length. Its zener voltage is defined at IZ = 20 mA, with guaranteed min/max bounds of 2.28 V and 2.52 V.
It exhibits 30 Ω dynamic impedance (ZZ) at 20 mA, supports up to 150 mA maximum zener current (IZM), and maintains IR ≤ 100 µA at VR = 1 V. Absolute maximum junction/storage temperature range is –65°C to +200°C, with 5% voltage tolerance and DO-35 glass encapsulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V nominal, 2.28–2.52 V range at IZ = 20 mA - defines stable regulation point for low-voltage reference circuits |
| Dynamic Impedance (ZZ) | 30 Ω max at IZ = 20 mA - determines output voltage stability under load variation |
| Max Zener Current (IZM) | 150 mA - sets upper limit for continuous power handling before thermal runaway |
| Power Dissipation (PD) | 500 mW at TL ≤ 75°C, derated 4.0 mW/°C above - constrains PCB layout and heatsinking requirements |
| Reverse Leakage (IR) | ≤100 µA at VR = 1 V - ensures minimal quiescent current in standby or sensing paths |
| Forward Voltage (VF) | ≤1.5 V at IF = 200 mA - enables use as clamping diode in bidirectional protection schemes |
| Package | DO-35 glass case with cathode band - standard axial-leaded form factor for manual assembly and wave soldering |
Pinout & Package
DO-35 glass axial package: hermetically sealed, 3.8 mm diameter × 9.5 mm length, cathode indicated by color band on body. Leads are tinned copper, 0.45 mm diameter, 3/8″ (9.5 mm) lead length standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to lower potential during regulation | Accepts current flow toward cathode when reverse-biased; must be routed to ground or return path in shunt regulator topology |
| Cathode | Negative terminal in forward bias; marked by color band; higher potential during regulation | Connected to regulated voltage node; carries full zener current in shunt configuration; polarity critical for correct operation |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-production trimming in cost-sensitive consumer and industrial controls |
| DO-35 glass encapsulation | Provides hermetic sealing and long-term stability for high-reliability analog references in harsh environments |
| Low dynamic impedance (30 Ω) | Minimizes output voltage deviation across 5–25 mA load current changes in feedback-sensing applications |
| Wide operating temperature range | –65°C to +200°C TJ/TSTG allows deployment in automotive engine compartments and industrial motor drives |
| Cathode band marking | Ensures unambiguous polarity identification during manual placement and automated optical inspection (AOI) |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Provides stable 2.4 V reference to bias input stages of rail-to-rail op-amps in battery-powered instrumentation. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise DC offset for analog signal conditioning. Use Value: Tight 5% tolerance and low ZZ ensure <±5 mV drift over 10–20 mA load variation, improving ADC measurement accuracy. |
Use Scenario: Clamps ESD transients on 3.3 V I²C lines connecting MEMS accelerometers to microcontrollers. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting bus voltage to safe levels during electrostatic discharge events. Use Value: Fast response and 1.5 V forward drop allow bidirectional clamping without interfering with normal logic-level signaling. |
| Power Supply Feedback Divider | Current-Limited Bias Source |
Use Scenario: Sets feedback voltage for adjustable DC-DC converter output in isolated flyback power supplies. IC Role / Device Role / Timing Role: Precision shunt element defining regulation threshold for optocoupler-coupled feedback loop. Use Value: Stable VZ over temperature ensures ±1.5% output regulation across –40°C to +85°C ambient range. |
Use Scenario: Supplies fixed 2.4 V bias to gate of low-side MOSFET in LED driver constant-current sink. IC Role / Device Role / Timing Role: Self-limiting current source formed with series resistor, leveraging VZ and ZZ characteristics. Use Value: Predictable 150 mA IZM and 500 mW PD enable robust 10–12 mA bias current with <2% variation over line voltage swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal VZ, same DO-35 package, 100 Ω ZZ, 100 mA IZM | Higher regulation voltage; less suitable for sub-3 V analog rails but better for 3.3 V logic clamping | Select when 3.3 V reference or clamp level is required; verify thermal margin due to lower IZM |
| BZX55C2V4 | 2.4 V VZ, ±5%, DO-35, 60 Ω ZZ, 590 mW PD, 100 µA IR @ 1 V | Higher power rating and identical voltage spec; different manufacturer (ON Semi) and marking convention | Preferred for higher-power shunt regulation where 500 mW margin is insufficient; verify cathode band orientation matches layout |
Compared with 1N4370A_T50R, the 1N4728A shifts regulation to 3.3 V with reduced current capability, while BZX55C2V4 retains 2.4 V but offers +90 mW power headroom and tighter thermal performance-making it suitable for extended ambient temperature operation.
Availability
1N4370A_T50R is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and bias generation applications requiring stable component supply in industrial control, sensor interface, and power management designs.
Supply support for 1N4370A_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 1N4370A_T50R belongs to Fairchild's legacy 1N-series Zener diode family, designed for general-purpose voltage regulation and transient suppression in cost-sensitive, high-volume consumer and industrial electronics.
FAQ
What is the zener voltage tolerance for the 1N4370A_T50R?
The 1N4370A_T50R has a zener voltage tolerance of ±5%, with a nominal VZ of 2.4 V and guaranteed range of 2.28 V to 2.52 V at IZ = 20 mA and TA = 25°C. This tolerance is measured under thermal equilibrium at lead temperature TL = 30°C ±1°C with 3/8″ lead length, per Fairchild Rev. D1 specification.
Does the 1N4370A_T50R support operation above 75°C?
Yes, the 1N4370A_T50R operates from –65°C to +200°C junction/storage temperature, but its power dissipation must be derated linearly at 4.0 mW/°C above TL = 75°C. At 100°C lead temperature, maximum allowable PD drops to 400 mW, ensuring safe thermal operation in elevated ambient environments.
How is cathode polarity identified on the 1N4370A_T50R?
The cathode of the 1N4370A_T50R is marked by a distinct color band on the DO-35 glass body. Per Fairchild top-marking specification, this band aligns with Line 3 "0A" and serves as the sole polarity indicator-no alphanumeric coding denotes cathode; the band must face the regulated voltage node in shunt configurations.
What is the maximum reverse leakage current for the 1N4370A_T50R?
The 1N4370A_T50R specifies IR ≤ 100 µA at VR = 1 V and TA = 25°C. At elevated temperatures (e.g., 125°C), leakage increases to ≤200 µA per the datasheet table. This low leakage supports use in high-impedance bias networks where current draw must remain below 0.1 mA.
Can the 1N4370A_T50R be used as a forward-biased diode?
Yes-the 1N4370A_T50R has VF ≤ 1.5 V at IF = 200 mA, confirming usable forward conduction. It is commonly deployed in bidirectional clamping circuits (e.g., I²C bus protection), where the anode and cathode handle both reverse breakdown and forward conduction during transient events without damage.
1N4370A_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):
- 2.4 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 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
1N4370A_T50R FAQ
1.How can I place an order for 1N4370A_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4370A_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 1N4370A_T50R reliable?
The price and inventory of 1N4370A_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4370A_T50R is usually 5 days.
3.What payment methods are accepted for 1N4370A_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4370A_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4370A_T50R?
1N4370A_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4370A_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 1N4370A_T50R?
For technical support, including 1N4370A_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4370A_T50R requirements.
6.How does Aetrix verify that 1N4370A_T50R is sourced from the original manufacturer or authorized distributors?
All 1N4370A_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 1N4370A_T50R meets industry standards.
7.What is the process for return or replacement of 1N4370A_T50R?
All 1N4370A_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N4370A_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 1N4370A_T50R part is unused and in its original packaging.
Return procedure for 1N4370A_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4370A_T50R Tags
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