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onsemi 1N4371A_T50A
- Part No.:
- 1N4371A_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4371A_T50A.pdf
- Description:
- DIODE ZENER 2.7V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,694
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Product details
Overview
1N4371A_T50A from Fairchild Semiconductor is a 2.7 V ±5% 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 150 mA maximum Zener current. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the 1N4371A_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal derating (4.0 mW/°C above 75°C), cathode-band polarity marking, and DO-35 mechanical compatibility with through-hole PCB layouts.
Technical Context
This device operates in reverse breakdown mode to maintain stable DC voltage regulation across varying load currents. Its 2.7 V nominal Zener voltage is specified at 20 mA test current, with 30 Ω dynamic impedance ensuring minimal output voltage variation under small-signal perturbations.
The DO-35 glass package supports operation from –65°C to +200°C, and its 3/8″ lead length requirement defines thermal resistance limits. Power dissipation is strictly limited to 500 mW below 75°C, decreasing linearly at 4.0 mW/°C above that temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ @ IZ = 20mA | 2.7 V nominal, min 2.57 V / max 2.84 V - defines regulated output voltage under standard test condition |
| ZZ @ IZ = 20mA | 30 Ω - determines sensitivity of output voltage to current changes in regulation region |
| IZM | 150 mA - maximum safe continuous Zener current before thermal runaway risk |
| PD @ TL ≤ 75°C | 500 mW - absolute power limit for reliable operation with 3/8″ leads |
| IR @ VR = 1V | 100 µA - reverse leakage level indicating junction quality and low-voltage blocking integrity |
| Tolerance | ±5% - specifies allowable deviation of actual VZ from nominal value at 25°C |
| Package | DO-35 - axial glass package with cathode band, standardized for manual and wave soldering |
Pinout & Package
DO-35 glass axial package with cathode identified by a single color band on the body. Leads are unmarked but functionally asymmetric: anode (unbanded end) and cathode (banded end). No internal terminals beyond two leads; no polarity-sensitive mounting orientation other than band alignment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to lower-potential side in shunt regulator configuration; carries forward current up to 200 mA (VF ≤ 1.5 V) |
| Cathode | Zener breakdown terminal / regulated output node | Connected to higher-potential side; maintains stable 2.7 V relative to anode when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage reference | 2.7 V ±5% tolerance enables stable biasing in sensor interfaces and op-amp references |
| Low dynamic impedance | 30 Ω at 20 mA ensures <10 mV output shift per 0.3 mA load change in regulation zone |
| High-temperature operation | –65°C to +200°C junction range supports under-hood automotive and industrial control environments |
| Standardized DO-35 footprint | Enables drop-in replacement across legacy Zener families without PCB redesign |
| Low leakage at low VR | 100 µA @ 1 V reverse bias confirms low-noise performance in high-impedance sensing nodes |
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 Zener reference providing fixed 2.7 V bias to Wheatstone bridge, independent of supply rail fluctuations. Use Value: Maintains <0.5% full-scale error in 12-bit ADC readings despite ±10% 5 V rail variation due to tight VZ tolerance and low ZZ. | Use Scenario: Generating accurate reference for internal ADC or brown-out detection in battery-powered MCU systems. IC Role / Device Role / Timing Role: Passive voltage clamp establishing known threshold for reset logic or analog comparator inputs. Use Value: Enables reliable 2.7 V BOD triggering with <±20 mV hysteresis margin, leveraging stable VZ and low IR drift over temperature. |
| Automotive Cabin Temperature Monitoring | Legacy Analog Meter Driver Circuit |
Use Scenario: Regulating supply to thermistor interface circuit in HVAC control units exposed to under-dash thermal cycling. IC Role / Device Role / Timing Role: Temperature-stable Zener shunt maintaining constant bias current for NTC thermistor ladder network. Use Value: Delivers <±1.2°C measurement accuracy from –40°C to +125°C ambient, validated by TJ range and derating curve compliance. | Use Scenario: Providing fixed reference voltage to drive moving-coil panel meters in industrial control panels. IC Role / Device Role / Timing Role: Low-noise DC voltage source setting full-scale deflection point for analog meter movement. Use Value: Ensures <±0.8% pointer position repeatability across 10-year service life, supported by glass-package hermeticity and low IR stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal VZ, same DO-35 package, 500 mW rating, ±5% tolerance | Higher reference voltage; requires circuit recalibration if replacing 1N4371A_T50A | Select only when 3.3 V bias is required and layout allows identical physical fit |
| BZX55C2V7 | 2.7 V VZ, ±5% tolerance, DO-35, 500 mW, but 35 Ω ZZ vs. 30 Ω for 1N4371A_T50A | Slightly higher dynamic impedance may increase regulation error under dynamic load steps | Acceptable where <5 mV additional ripple is tolerable; verify thermal margin with same lead length |
Compared with 1N4371A_T50A, the 1N4728A shifts system reference upward by 0.6 V and demands recalibration, while the BZX55C2V7 matches voltage but trades 5 Ω higher impedance for broader manufacturer support and RoHS compliance-both require validation of thermal derating behavior in target layout.
Availability
1N4371A_T50A is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, low-power microcontroller voltage reference, and automotive cabin temperature monitoring requiring stable component supply and long-term obsolescence management.
Supply support for 1N4371A_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
Fairchild Semiconductor was a U.S.-based designer of high-performance analog and discrete semiconductors, acquired by ON Semiconductor in 2016; its legacy Zener diodes remain widely deployed in industrial and automotive systems.
The 1N4371A_T50A belongs to Fairchild's 1N437x series of general-purpose Zener diodes engineered for precision voltage regulation in cost-sensitive, high-reliability through-hole applications.
FAQ
What is the Zener voltage tolerance for 1N4371A_T50A?
The 1N4371A_T50A has a Zener voltage tolerance of ±5% at 25°C, meaning its actual breakdown voltage falls between 2.57 V and 2.84 V when tested at 20 mA. This tolerance is guaranteed across the full operating temperature range and is critical for designs requiring predictable clamping or referencing behavior without post-calibration.
Can 1N4371A_T50A be used in surface-mount designs?
No, the 1N4371A_T50A uses a DO-35 glass axial package designed exclusively for through-hole mounting. It lacks SMD-compatible terminations or thermal pad structure. For surface-mount equivalents, consider SOD-123 or SOD-323 packaged Zeners like BZT52-B2V7, but note differences in thermal resistance and derating curves.
What is the maximum power dissipation for 1N4371A_T50A at 100°C ambient?
At 100°C ambient, the 1N4371A_T50A must be derated from its 500 mW rating at ≤75°C. With a 4.0 mW/°C derating slope, power drops to 400 mW (500 − [4.0 × (100 − 75)] = 400 mW). This assumes 3/8″ lead length; shorter leads reduce heat transfer and require further derating.
How is cathode polarity identified on 1N4371A_T50A?
The cathode of the 1N4371A_T50A is marked by a single color band on the DO-35 glass body. The unbanded end is the anode. This marking follows JEDEC standards and is visible under standard visual inspection-no multimeter verification is needed for correct orientation during hand assembly or wave soldering.
Does 1N4371A_T50A support bidirectional ESD protection?
No, the 1N4371A_T50A is a unidirectional Zener diode optimized for reverse-bias voltage regulation, not transient suppression. Its forward voltage is 1.5 V max at 200 mA, but it lacks symmetric clamping characteristics or specified ESD ratings. For bidirectional protection, use dedicated TVS diodes such as P6KE27CA.
1N4371A_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 2.7 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 75 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
1N4371A_T50A FAQ
1.How can I place an order for 1N4371A_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4371A_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 1N4371A_T50A reliable?
The price and inventory of 1N4371A_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4371A_T50A is usually 5 days.
3.What payment methods are accepted for 1N4371A_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4371A_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4371A_T50A?
1N4371A_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4371A_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 1N4371A_T50A?
For technical support, including 1N4371A_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4371A_T50A requirements.
6.How does Aetrix verify that 1N4371A_T50A is sourced from the original manufacturer or authorized distributors?
All 1N4371A_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 1N4371A_T50A meets industry standards.
7.What is the process for return or replacement of 1N4371A_T50A?
All 1N4371A_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4371A_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 1N4371A_T50A part is unused and in its original packaging.
Return procedure for 1N4371A_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4371A_T50A Tags
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