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onsemi 1N5993B_T50A
- Part No.:
- 1N5993B_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5993B_T50A.pdf
- Description:
- DIODE ZENER 5.1V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,331
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Product details
Overview
1N5993B_T50A from Fairchild Semiconductor is a 5.1 V, ±5% tolerance Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 50 Ω zener impedance at 5 mA test current and 2 mA maximum leakage current at 4.845 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in low-power analog regulators and signal conditioning circuits.
For engineers reviewing the 1N5993B_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include verified zener voltage tolerance, thermal derating behavior (4.0 mW/°C above 75°C), junction temperature range (–65°C to +200°C), and DO-35 mechanical compatibility in space-constrained PCB layouts.
Technical Context
This discrete Zener diode operates in reverse breakdown mode to maintain stable voltage regulation under controlled current conditions. Its electrical behavior is defined by three critical operating points: nominal zener voltage (4.845 V min / 5.355 V max), dynamic impedance (50 Ω at IZ = 5 mA), and knee impedance (2050 Ω at IZK = 250 μA), ensuring predictable clamping across varying load currents.
The device uses a planar-diffused silicon junction in a hermetically sealed DO-35 glass package with cathode band marking. Thermal performance is governed by lead temperature (TL) at 3/8″ length, requiring careful PCB trace design to meet the 75°C thermal limit for full 500 mW rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.845 V (min) to 5.355 V (max) at 5 mA - defines usable regulation window for 5.1 V nominal reference |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power before thermal derating begins |
| Zener Impedance (ZZ) | 50 Ω @ IZ = 5 mA - determines output voltage variation under load current changes |
| Leakage Current (IR) | 2 mA max @ VR = 4.845 V - limits standby power loss in high-impedance bias networks |
| Operating Temperature | –65°C to +200°C - enables use in automotive under-hood or industrial motor control environments |
| Forward Voltage (VF) | 1.2 V max @ IF = 200 mA - supports bidirectional ESD protection when used with series resistor |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal connections beyond anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener breakdown return path | Connected to lower potential node in regulation or clamp configuration |
| Cathode | Reverse breakdown terminal / Zener voltage reference node | Marked with band; connected to regulated output or protected signal line |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables tight regulation without post-assembly trimming in cost-sensitive consumer power supplies |
| DO-35 glass package | Provides hermetic sealing and stable long-term parametric drift for 10+ year field life |
| 2050 Ω knee impedance | Ensures reliable turn-on at low currents (250 μA), supporting micropower sensor biasing |
| 4.0 mW/°C thermal derating | Allows accurate power budgeting in thermally constrained enclosures using standard FR-4 PCB layout |
Applications
| Voltage Reference for Op-Amp Circuits | Overvoltage Clamp in Signal Conditioning |
|---|---|
Use Scenario: Providing stable 5.1 V reference to instrumentation amplifier input stages in portable medical sensors. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference, establishing precise common-mode bias point. Use Value: ±5% tolerance and low 50 Ω dynamic impedance minimize offset drift across temperature and supply variations. | Use Scenario: Protecting ADC input pins from transient overvoltage during ESD events in industrial data acquisition modules. IC Role / Device Role / Timing Role: Zener diode functions as passive clamp, diverting excess energy to ground before damage threshold. Use Value: 2050 Ω knee impedance ensures activation at 250 μA, enabling fast response without loading the signal source. |
| Low-Power Regulator for Microcontroller Peripherals | Reference Source for Analog Switch Biasing |
Use Scenario: Generating local 5.1 V rail for EEPROM programming circuitry in battery-powered IoT edge nodes. IC Role / Device Role / Timing Role: Zener diode serves as simple shunt regulator, sinking excess current from series resistor. Use Value: 500 mW rating and –65°C to +200°C range support intermittent high-current pulses without thermal runaway. | Use Scenario: Setting threshold voltage for analog multiplexer on-resistance control in audio routing ICs. IC Role / Device Role / Timing Role: Zener diode provides fixed bias voltage to gate driver network of CMOS analog switches. Use Value: Stable 4.845–5.355 V range ensures consistent switch conduction characteristics across process and temperature corners. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | Same 5.1 V nominal, but ±5% tolerance achieved via tighter binning; 1.0 mA leakage at 4.8 V vs. 2 mA for 1N5993B_T50A | Lower leakage supports ultra-low-power sleep modes where <1 μA standby current is required | Select 1N4733A when sub-microamp leakage dominates system power budget |
| BZX55-C5V1 | Same 5.1 V, ±5%, but DO-35 package with different marking and 600 mW rating; 70 Ω ZZ vs. 50 Ω | Higher power rating allows higher current operation without external heatsinking | Select BZX55-C5V1 when sustained >50 mA zener current is needed in ambient >75°C environments |
Compared with 1N4733A and BZX55-C5V1, the 1N5993B_T50A offers the lowest dynamic impedance (50 Ω) among the three, delivering superior regulation stability under dynamic load transients, while maintaining identical DO-35 footprint and thermal profile.
Availability
1N5993B_T50A is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and low-power regulation applications requiring stable component supply, long-term parametric consistency, and DO-35 mechanical compatibility.
Supply support for 1N5993B_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 1N5993B_T50A belongs to Fairchild's legacy 1N59xxB Zener diode family, designed for general-purpose voltage regulation and clamping in cost-sensitive, high-reliability industrial and consumer electronics.
FAQ
What is the exact zener voltage range for 1N5993B_T50A at 25°C?
The 1N5993B_T50A has a guaranteed zener voltage range of 4.845 V (minimum) to 5.355 V (maximum) when tested at 5 mA current and 25°C ambient temperature, per Fairchild's Rev. C2 datasheet. This 5.1 V nominal rating with ±5% tolerance reflects manufacturing binning and ensures predictable regulation performance across production lots.
Does 1N5993B_T50A support operation above 75°C ambient?
Yes, the 1N5993B_T50A can operate up to +200°C junction temperature, but its power dissipation must be derated linearly at 4.0 mW/°C above a lead temperature of 75°C. For example, at TL = 100°C, maximum allowable power drops to 400 mW. PCB layout must ensure adequate heat sinking to maintain safe thermal margins.
What is the forward voltage specification for 1N5993B_T50A?
The 1N5993B_T50A has a maximum forward voltage of 1.2 V at 200 mA forward current, as specified in the Absolute Maximum Ratings table. This parameter supports dual-use scenarios such as reverse-biased regulation and forward-biased ESD protection paths, though it is not intended for continuous forward conduction.
How is the cathode identified on the 1N5993B_T50A DO-35 package?
The cathode of the 1N5993B_T50A is marked by a distinct color band on the DO-35 glass body, consistent with industry-standard polarity marking. The band aligns with the third-line marking "3B" visible under magnification, confirming device identity and orientation during manual or automated placement.
Is 1N5993B_T50A suitable for precision voltage reference applications?
The 1N5993B_T50A provides ±5% zener voltage tolerance and 50 Ω dynamic impedance, making it suitable for moderate-precision applications like power supply feedback, signal clamping, and bias generation. For sub-1% accuracy, externally trimmed references or bandgap-based ICs are recommended instead of the 1N5993B_T50A.
1N5993B_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):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 50 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 2 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
1N5993B_T50A FAQ
1.How can I place an order for 1N5993B_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5993B_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 1N5993B_T50A reliable?
The price and inventory of 1N5993B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5993B_T50A is usually 5 days.
3.What payment methods are accepted for 1N5993B_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5993B_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5993B_T50A?
1N5993B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5993B_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 1N5993B_T50A?
For technical support, including 1N5993B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5993B_T50A requirements.
6.How does Aetrix verify that 1N5993B_T50A is sourced from the original manufacturer or authorized distributors?
All 1N5993B_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 1N5993B_T50A meets industry standards.
7.What is the process for return or replacement of 1N5993B_T50A?
All 1N5993B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5993B_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 1N5993B_T50A part is unused and in its original packaging.
Return procedure for 1N5993B_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5993B_T50A Tags
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