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Microchip Technology 1N5246B/TR
- Part No.:
- 1N5246B/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5246B/TR.pdf
- Description:
- DIODE ZENER 16V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,586
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Product details
Overview
1N5246B/TR from Microsemi is a 16 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 7.8 mA test current and 600 Ω dynamic impedance at 0.25 mA, operating from −65 °C to +175 °C. It serves as a precision voltage reference or shunt regulator in low-power analog circuits, power supply feedback paths, and overvoltage protection.
For engineers reviewing the 1N5246B/TR datasheet, 1N5246B/TR pinout, 1N5246B/TR application, or 1N5246B/TR equivalent, key selection criteria include its 16 V nominal Zener voltage, 5% tolerance, 600 Ω Zener impedance at low current, −65 °C to +175 °C operating range, and DO-35 axial-leaded mechanical form factor suitable for through-hole prototyping and high-reliability industrial PCBs.
Technical Context
This discrete Zener diode operates in reverse breakdown mode with cathode band indicating polarity. Its regulation performance is defined at 7.8 mA test current (IZT), with dynamic impedance measured at both IZT and 0.25 mA (IZK), ensuring stable knee characteristics per MicroNote 202.
Thermal resistance is 250 °C/W junction-to-lead (3/8″ lead length) and 310 °C/W junction-to-ambient on FR4 board; derating begins above 50 °C lead temperature or 25 °C ambient, supporting use in thermally constrained environments without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 16 V ±5% - defines regulated output voltage under 7.8 mA test current, critical for reference accuracy in feedback loops |
| Power Dissipation (PD) | 500 mW at 25 °C - sets maximum continuous DC power handling before thermal derating applies |
| Zener Impedance (ZZT) | 600 Ω at IZK = 0.25 mA - indicates voltage stability under light-load conditions typical in sensing or biasing |
| Reverse Current (IR) | 10 μA max @ 12.8 V - ensures low leakage below breakdown, preserving efficiency in standby circuits |
| Temperature Coefficient (αVZ) | +0.083 %/°C - quantifies voltage drift with temperature, enabling compensation in wide-temperature designs |
| Operating Temperature Range | −65 °C to +175 °C - supports deployment in aerospace, downhole, and automotive under-hood applications |
| Forward Voltage (VF) | 1.5 V max @ 200 mA - defines conduction threshold in forward-biased protection or clamping roles |
Pinout & Package
Hermetically sealed DO-35 (DO-204AH) glass axial-leaded package with cathode indicated by a single dark band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node during Zener operation; forward conduction path when biased positively |
| Cathode | Banded end | Connected to higher-potential node during regulation; defines polarity for correct shunt placement in voltage reference circuits |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N52xxB series | Ensures standardized electrical behavior and interchangeability across qualified suppliers |
| RoHS-compliant option (e3 suffix) | Enables compliance with environmental directives without sacrificing electrical or thermal performance |
| Minimal capacitance (typ. <2 pF) | Preserves high-frequency signal integrity in RF biasing and fast transient suppression |
| Radiation-hardened per MicroNote 050 | Supports operation in space-grade and nuclear instrumentation systems without parameter shift |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for external ESD protection during handling and assembly in production environments |
Applications
| Industrial Power Supply Feedback | Automotive Sensor Reference |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated DC-DC converters to regulate output voltage within ±1%. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 16 V reference to TL431 or similar error amplifier input. Use Value: Enables tight output regulation despite line/load variations due to low 600 Ω ZZK and +0.083%/°C tempco. | Use Scenario: Supplies precise bias voltage to pressure transducer bridge amplifiers in engine control units. IC Role / Device Role / Timing Role: Low-drift Zener reference establishing common-mode level for ratiometric sensor excitation. Use Value: Maintains accuracy over −40 °C to +125 °C engine bay temperatures thanks to specified −65 °C to +175 °C rating and known tempco. |
| Aerospace Voltage Clamp | Test Equipment Calibration Reference |
Use Scenario: Protects ADC inputs in flight data recorders against transient overvoltage events up to 200 V. IC Role / Device Role / Timing Role: Fast-response shunt clamp absorbing surge energy while holding node voltage near 16 V. Use Value: Survives repeated surges due to hermetic DO-35 glass construction and radiation hardness per MicroNote 050. | Use Scenario: Serves as primary 16 V calibration standard in bench multimeters and automated test fixtures. IC Role / Device Role / Timing Role: Precision voltage reference traceable to NIST via manufacturer's test data and JEDEC registration. Use Value: Delivers ±5% initial tolerance and predictable tempco for metrology-grade repeatability without active circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5246B | No TR suffix; bulk packaging instead of tape-and-reel | Same electrical specs but unsuitable for automated pick-and-place assembly | Select 1N5246B/TR when requiring reel-fed SMT line compatibility and consistent feed reliability |
| MMBZ5246B-TP | Surface-mount SOT-23 package; 225 mW power rating; 16 V ±5% | Limited to low-power PCBs with space constraints; not interchangeable in through-hole layouts | Choose MMBZ5246B-TP only when board real estate is critical and thermal load remains below 225 mW |
Compared with 1N5246B/TR, the 1N5246B lacks tape-and-reel packaging for automated assembly, while MMBZ5246B-TP trades mechanical robustness and power handling for miniaturization-making 1N5246B/TR optimal for high-reliability through-hole designs needing full 500 mW capability and JEDEC-standardized form factor.
Availability
1N5246B/TR is available at Aetrix Electronics and suitable for industrial power supply feedback, aerospace voltage clamp, and test equipment calibration reference requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1N5246B/TR 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and high-voltage analog components for aerospace, defense, and industrial markets.
The 1N52xxB series was designed for precision voltage regulation in mission-critical systems where long-term stability, wide temperature operation, and JEDEC-standardized interchangeability are mandatory.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5246B/TR?
The 1N5246B/TR has a nominal Zener voltage of 16 V with a guaranteed tolerance of ±5%, as indicated by the "B" suffix per JEDEC specification. This tolerance is verified at 7.8 mA test current and 25 °C ambient, making it suitable for applications requiring moderate voltage reference accuracy without trimming.
Does the 1N5246B/TR have a specified Zener impedance, and at what condition is it measured?
Yes, the 1N5246B/TR has a maximum Zener impedance (ZZK) of 600 Ω, measured at 0.25 mA Zener knee current (IZK). This value reflects dynamic resistance near the breakdown knee and is critical for evaluating regulation stability under light-load conditions in reference or bias circuits.
What is the maximum operating temperature range for the 1N5246B/TR?
The 1N5246B/TR is rated for operation from −65 °C to +175 °C, as confirmed in the Microsemi datasheet. This extended range supports use in harsh environments such as automotive under-hood electronics, downhole oilfield tools, and military avionics where conventional diodes would fail.
Is the 1N5246B/TR RoHS compliant, and how is compliance indicated?
Yes, RoHS-compliant versions of the 1N5246B/TR are available with the "e3" suffix (e.g., 1N5246B-e3/TR). The base 1N5246B/TR may use tin-lead plating unless otherwise specified; RoHS compliance requires explicit ordering with the e3 designation per Microsemi's packaging guidelines.
What does the "TR" suffix signify in the 1N5246B/TR part number?
The "TR" suffix in 1N5246B/TR indicates tape-and-reel packaging per EIA-296 standard, enabling automated surface-mount or through-hole placement. It does not alter electrical specifications-only packaging format-and is essential for high-volume manufacturing with pick-and-place equipment.
1N5246B/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 12 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5246B/TR FAQ
1.How can I place an order for 1N5246B/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5246B/TR 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 1N5246B/TR reliable?
The price and inventory of 1N5246B/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5246B/TR is usually 5 days.
3.What payment methods are accepted for 1N5246B/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5246B/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5246B/TR?
1N5246B/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5246B/TR 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 1N5246B/TR?
For technical support, including 1N5246B/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5246B/TR requirements.
6.How does Aetrix verify that 1N5246B/TR is sourced from the original manufacturer or authorized distributors?
All 1N5246B/TR 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 1N5246B/TR meets industry standards.
7.What is the process for return or replacement of 1N5246B/TR?
All 1N5246B/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5246B/TR, 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 1N5246B/TR part is unused and in its original packaging.
Return procedure for 1N5246B/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5246B/TR Tags
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