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onsemi 1N5998B_T50R
- Part No.:
- 1N5998B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5998B_T50R.pdf
- Description:
- DIODE ZENER 8.2V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:4,182
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Product details
Overview
1N5998B_T50R from Fairchild Semiconductor is a 5% tolerance, 7.79 V nominal Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 4.0 mW/°C derating, designed for precision voltage regulation and reference applications in analog power supplies and signal conditioning circuits.
For engineers reviewing the 1N5998B_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), dynamic impedance (7 Ω @ 5 mA), leakage current (0.5 mA @ 6.5 V), and thermal stability across –65°C to +200°C operating range.
Technical Context
The 1N5998B_T50R operates as a reverse-biased voltage reference diode with tightly controlled Zener breakdown at 7.79 V (min 7.125 V, max 8.61 V) under 5 mA test current. Its low dynamic impedance (7 Ω) ensures stable regulation under varying load conditions.
It features a DO-35 axial glass package with cathode band marking, supports lead temperature–based power derating, and maintains specified electrical characteristics over –65°C to +200°C junction/storage temperature range without requiring external biasing circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.125–8.61 V @ 5 mA - defines regulated output voltage window under nominal test condition |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - maximum steady-state power handling before thermal derating applies |
| Zener Impedance (ZZ) | 7 Ω @ IZ = 5 mA - low dynamic resistance enables tight voltage regulation during load transients |
| Leakage Current (IR) | 0.5 mA @ VR = 6.5 V - quantifies off-state conduction limiting error in high-impedance reference nodes |
| Operating Temperature | –65°C to +200°C - supports operation in automotive under-hood, industrial control, and aerospace environments |
| Forward Voltage (VF) | 1.2 V max @ IF = 200 mA - ensures predictable forward conduction if used in bidirectional protection or clamping |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal connections beyond anode and cathode leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference return path | Connected to lower-potential node in reverse-bias regulation configuration; carries full load current in shunt regulator topology |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with color band; connected to regulated voltage node; referenced to system ground or common rail in feedback loops |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables use in ±5% accuracy reference designs without trimming or calibration |
| Low Zener impedance (7 Ω) | Minimizes output voltage deviation under ±10% load current variation in shunt regulators |
| Wide temperature range (–65°C to +200°C) | Eliminates need for external thermal compensation in high-reliability industrial and automotive systems |
| DO-35 glass package with cathode band | Provides visual polarity identification and hermetic sealing for long-term parameter stability |
Applications
| Voltage Reference for ADC/DAC | Overvoltage Clamp in Signal Path |
|---|---|
Use Scenario: Providing stable 7.79 V reference to 12-bit SAR ADC input stage in industrial data acquisition module. IC Role / Device Role / Timing Role: Precision shunt voltage reference establishing known full-scale input threshold. Use Value: Enables <±0.5 LSB integral nonlinearity by maintaining <10 mV drift over –40°C to +85°C ambient. |
Use Scenario: Clamping op-amp output to prevent excursion beyond 8.2 V in sensor amplifier front-end. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as fast-acting voltage limiter on analog signal line. Use Value: Limits transient overshoot to <8.61 V while drawing <1 mA leakage at 6.5 V, preserving signal integrity. |
| Power Supply Feedback Divider | Microcontroller Reset Threshold |
Use Scenario: Setting feedback voltage for adjustable DC-DC converter output at 15.58 V using resistive divider. IC Role / Device Role / Timing Role: Stable Zener reference replacing resistor-only divider to improve load regulation. Use Value: Reduces output voltage drift from ±3% to ±0.8% over line/load/temperature due to low ZZ and tight VZ tolerance. |
Use Scenario: Generating precise 7.79 V reset threshold for 3.3 V microcontroller supervisory circuit. IC Role / Device Role / Timing Role: Zener-based comparator reference enabling brown-out detection at defined margin. Use Value: Ensures reset assertion within 100 µs of supply drop below 7.125 V, meeting MIL-STD-704F startup requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5237B (ON Semiconductor) | Same 7.5 V nominal rating, 5% tolerance, but higher ZZ (10 Ω) and lower PD (500 mW @ 50°C only) | Less stable under dynamic load; requires tighter thermal management in enclosed enclosures | Select when legacy ON Semi BOM compatibility required and thermal margin >15°C exists |
| BZX55-C7V5 (Vishay) | 7.5 V nominal, 5% tolerance, DO-35, but higher leakage (1.0 mA @ 6.0 V) and wider VZ spread (7.13–7.88 V) | Higher reference error in precision analog circuits; unsuitable for sub-0.5% accuracy designs | Prefer for cost-sensitive consumer applications where ±1% regulation suffices |
Compared with 1N5998B_T50R, the 1N5237B offers identical nominal voltage but reduced thermal robustness, while the BZX55-C7V5 trades tighter voltage control for broader process variation-making 1N5998B_T50R optimal for industrial-grade voltage references demanding low ZZ and wide temperature resilience.
Availability
1N5998B_T50R is available at Aetrix Electronics and suitable for industrial power supplies, analog sensor interfaces, and embedded microcontroller reset circuits requiring stable component supply and long-term parametric consistency.
Supply support for 1N5998B_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; its legacy Zener diodes remain widely deployed in industrial and automotive systems.
The 1N59xxB series was engineered for high-stability voltage reference and regulation in harsh-environment analog circuits, emphasizing tight tolerance, low dynamic impedance, and extended temperature capability over cost-optimized alternatives.
FAQ
What is the exact Zener voltage range for 1N5998B_T50R at 25°C?
The 1N5998B_T50R has a guaranteed Zener voltage range of 7.125 V (minimum) to 8.61 V (maximum) when tested at 5 mA and 25°C ambient, per Fairchild's Rev. C2 datasheet. This 5% tolerance window reflects manufacturing spread and ensures predictable regulation behavior across production lots without post-manufacture sorting.
Does 1N5998B_T50R support operation above 100°C junction temperature?
Yes, the 1N5998B_T50R is rated for continuous operation from –65°C to +200°C junction and storage temperature. Its DO-35 glass package and silicon die construction maintain electrical specifications up to +200°C, making it suitable for under-hood automotive and downhole industrial applications where thermal stress exceeds standard commercial-grade parts.
How does the 7 Ω Zener impedance of 1N5998B_T50R affect load regulation performance?
The 7 Ω Zener impedance (ZZ) of 1N5998B_T50R directly determines how much the output voltage shifts with load current changes: for every 10 mA change in shunt current, voltage varies by ~70 mV. This low value enables stable regulation in precision analog circuits where load transients must not induce >100 mV error in the reference node.
Can 1N5998B_T50R be used in forward-bias applications?
Yes-the 1N5998B_T50R specifies a maximum forward voltage of 1.2 V at 200 mA, confirming usable forward conduction. While optimized for reverse-bias Zener operation, it can serve as a low-drop rectifier or clamp diode in dual-purpose protection circuits, provided forward current remains within SOA limits defined by thermal derating curves.
What is the meaning of the "T50R" suffix in 1N5998B_T50R?
The "T50R" suffix denotes Fairchild's tape-and-reel packaging option: T = tape, 50 = 50 mm tape width, R = reel. It indicates the part is supplied in EIA-481-compliant carrier tape on 7-inch reels, typically containing 2,000 units per reel, enabling automated SMT placement despite the DO-35 axial form factor requiring radial-to-axial conversion feeders.
1N5998B_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):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 6.5 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
1N5998B_T50R FAQ
1.How can I place an order for 1N5998B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5998B_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 1N5998B_T50R reliable?
The price and inventory of 1N5998B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5998B_T50R is usually 5 days.
3.What payment methods are accepted for 1N5998B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5998B_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5998B_T50R?
1N5998B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5998B_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 1N5998B_T50R?
For technical support, including 1N5998B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5998B_T50R requirements.
6.How does Aetrix verify that 1N5998B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N5998B_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 1N5998B_T50R meets industry standards.
7.What is the process for return or replacement of 1N5998B_T50R?
All 1N5998B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N5998B_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 1N5998B_T50R part is unused and in its original packaging.
Return procedure for 1N5998B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5998B_T50R Tags
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