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onsemi 1N5992B_T50A
- Part No.:
- 1N5992B_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5992B_T50A.pdf
- Description:
- DIODE ZENER 4.7V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:4,297
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Product details
Overview
1N5992B_T50A from Fairchild Semiconductor is a 4.7 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 70 Ω zener impedance at 5 mA test current and 3 mA maximum leakage current at 1.5 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits.
For engineers reviewing the 1N5992B_T50A datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode identification per DO-35 marking convention, and direct alternative options for voltage reference design.
Technical Context
The 1N5992B_T50A operates as a silicon planar Zener diode with sharp reverse breakdown at nominal 4.7 V, stabilized by controlled doping and junction geometry. Its 70 Ω dynamic impedance at IZ = 5 mA ensures stable regulation under moderate load variation, while the 250 µA knee current (ZZK = 2200 Ω) defines low-current regulation onset.
Thermal performance is defined by 4.0 mW/°C derating above 75°C lead temperature, with junction and storage temperature spanning –65°C to +200°C. The DO-35 glass package provides hermetic sealing and standard axial lead form factor compatible with through-hole PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.465 V min / 4.7 V typ / 4.935 V max at IZ = 5 mA - defines tight 5% tolerance band for stable reference generation |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous DC power handling in standard lead-length condition |
| Zener Impedance (ZZ) | 70 Ω @ IZ = 5 mA - determines output voltage deviation under load current change |
| Leakage Current (IR) | 3 mA max @ VR = 1.5 V - specifies maximum reverse conduction before breakdown onset |
| Max Zener Current (IZM) | 106 mA - derived from PD and VZ, limits peak surge capability without thermal runaway |
| Operating Temp Range | –65°C to +200°C - supports deployment in automotive under-hood and industrial high-temp environments |
Pinout & Package
DO-35 glass axial package with cathode identified by color band on body; anode and cathode leads are unmarked but follow standard diode polarity convention (band = cathode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse bias reference return | Connected to lower-potential node in shunt regulator configuration; carries full load current when regulating |
| Cathode | Zener breakdown terminal / Reference output node | Provides stable 4.7 V reference point relative to anode; marked by visible color band per JEDEC DO-35 standard |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Ensures predictable reference accuracy across production lots without post-manufacture trimming |
| DO-35 glass hermetic package | Guarantees long-term parameter stability and moisture resistance in harsh ambient conditions |
| 4.0 mW/°C thermal derating | Enables precise power budgeting in thermally constrained layouts with known lead temperature rise |
| 2200 Ω knee impedance (ZZK) | Defines usable regulation range down to microamp-level currents for ultra-low-power sensing |
| –65°C to +200°C operating range | Validates suitability for extended-temperature applications including engine control and downhole electronics |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Signal Conditioning |
|---|---|
Use Scenario: Provides stable 4.7 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 independent of supply rail variation. Use Value: Maintains amplifier common-mode input range accuracy within ±1% over temperature due to tight 5% VZ tolerance and low ZZ. |
Use Scenario: Protects ADC inputs from transient overvoltage during ESD events in industrial pressure transducers. IC Role / Device Role / Timing Role: Fast-acting crowbar element clamping signal lines to 4.7 V before damage threshold is exceeded. Use Value: Limits peak excursion to ≤4.935 V (max VZ) with <100 ns response, preventing ADC saturation and data corruption. |
| Low-Power Microcontroller Reset Circuit | Current-Limited LED Bias Reference |
Use Scenario: Generates clean reset threshold for 3.3 V MCUs using resistor-divider feedback into supervisor IC. IC Role / Device Role / Timing Role: Precision threshold generator defining exact voltage at which reset assertion occurs. Use Value: Enables repeatable reset activation at 4.7 V ±0.235 V, eliminating false triggers caused by supply ripple or noise. |
Use Scenario: Sets constant current for indicator LEDs in HVAC control panels via series resistor + Zener drop. IC Role / Device Role / Timing Role: Stable voltage sink enabling predictable current calculation (ILED ≈ (VCC − 4.7 V)/R). Use Value: Delivers consistent LED brightness across 0–70°C ambient due to low thermal coefficient of VZ and DO-35 thermal mass. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4732A (ON Semiconductor) | Same 4.7 V nominal rating, 5% tolerance, DO-41 package (larger than DO-35), 1.0 W PD | Higher power handling supports higher current clamping but requires larger PCB footprint | Select when >500 mW dissipation or enhanced surge robustness is required |
| BZX55-C4V7 (Vishay) | 4.7 V ±5%, DO-35 package, 500 mW rating, but 100 Ω ZZ @ 5 mA (vs. 70 Ω for 1N5992B_T50A) | Slightly higher dynamic impedance reduces regulation precision under varying load | Select when cross-compatibility with legacy BZX55 designs is prioritized over minimal ZZ |
Compared with 1N4732A and BZX55-C4V7, the 1N5992B_T50A offers optimal balance of DO-35 footprint, 70 Ω low-impedance regulation, and proven thermal stability-making it preferred for space-constrained, precision-biased analog subsystems.
Availability
1N5992B_T50A is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection, and low-power reset circuitry requiring stable component supply and traceable sourcing.
Supply support for 1N5992B_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 semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The 1N5992B_T50A belongs to Fairchild's legacy 1N59xxB Zener diode family, engineered for general-purpose voltage regulation and reference applications in consumer, industrial, and computing systems.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5992B_T50A?
The 1N5992B_T50A has a nominal Zener voltage of 4.7 V with a guaranteed tolerance of ±5%, meaning the actual VZ falls between 4.465 V and 4.935 V when measured at IZ = 5 mA and TL = 30°C. This tolerance is factory-tested and specified per Fairchild's Rev. C2 datasheet, ensuring consistent performance across production lots without user calibration.
What is the maximum power dissipation and thermal derating behavior of the 1N5992B_T50A?
The 1N5992B_T50A is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C with 3/8″ lead length. Above 75°C, it derates linearly at 4.0 mW/°C - for example, at TL = 100°C, maximum allowable power drops to 400 mW. This derating curve is defined in the Absolute Maximum Ratings table and must be applied in thermal design to prevent junction overheating.
How is cathode polarity identified on the 1N5992B_T50A package?
The cathode of the 1N5992B_T50A is identified by a visible color band on the DO-35 glass body, consistent with JEDEC standard marking for axial-leaded diodes. The band marks the cathode terminal, while the unmarked end is the anode. This marking is confirmed in the "Top Mark Information" section of the Fairchild datasheet and applies identically across all 1N59xxB variants.
What is the Zener impedance of the 1N5992B_T50A and why does it matter?
The 1N5992B_T50A exhibits a Zener impedance (ZZ) of 70 Ω at IZ = 5 mA, as specified in the Electrical Characteristics table. This value quantifies how much the output voltage changes per unit change in current - lower ZZ means tighter regulation under varying load, critical for precision reference and low-noise biasing applications where voltage drift must be minimized.
Can the 1N5992B_T50A be used in high-temperature environments?
Yes, the 1N5992B_T50A is rated for operation from –65°C to +200°C, making it suitable for high-temperature environments such as automotive under-hood modules or industrial motor controls. Its DO-35 glass package maintains parameter stability across this full range, and the 4.0 mW/°C derating rule ensures safe operation up to the maximum junction temperature when thermal design accounts for lead temperature rise.
1N5992B_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):
- 4.7 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N5992B_T50A FAQ
1.How can I place an order for 1N5992B_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5992B_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 1N5992B_T50A reliable?
The price and inventory of 1N5992B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5992B_T50A is usually 5 days.
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1N5992B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5992B_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 1N5992B_T50A?
For technical support, including 1N5992B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5992B_T50A requirements.
6.How does Aetrix verify that 1N5992B_T50A is sourced from the original manufacturer or authorized distributors?
All 1N5992B_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 1N5992B_T50A meets industry standards.
7.What is the process for return or replacement of 1N5992B_T50A?
All 1N5992B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5992B_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 1N5992B_T50A part is unused and in its original packaging.
Return procedure for 1N5992B_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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