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Microchip Technology 1N5246A/TR
- Part No.:
- 1N5246A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5246A/TR.pdf
- Description:
- DIODE ZENER 16V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:4,957
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Product details
Overview
1N5246A/TR from Microsemi is a 16 V, ±10% 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 provides stable voltage regulation in low-power reference and protection circuits.
For engineers reviewing the 1N5246A/TR datasheet, 1N5246A/TR pinout, 1N5246A/TR application, or 1N5246A/TR equivalent, this part serves as a precision, temperature-stable, axial-leaded Zener regulator with RoHS-compliant plating, tape-and-reel packaging (TR suffix), and MIL-PRF-19500 screening options.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable 16 V reference across its cathode–anode terminals under controlled current conditions. Its 600 Ω zener impedance at IZK = 0.25 mA and +0.083 %/°C temperature coefficient define its regulation stability over temperature and load variation.
The device uses a hermetically sealed glass DO-35 package with tin-lead or RoHS-compliant matte-tin plating, rated for 0.5 W at 25 °C with 250 °C/W junction-to-lead thermal resistance at 3/8″ lead length. Forward voltage is ≤1.5 V at 200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 16 V @ 7.8 mA - precise regulation point for low-power biasing and reference generation |
| Zener Tolerance | ±10% (A suffix) - defines worst-case voltage spread in production batches |
| Power Dissipation | 500 mW at 25 °C - sets maximum continuous power before thermal derating applies |
| Zener Impedance | 600 Ω @ IZK = 0.25 mA - indicates regulation stiffness near knee region |
| Temp. Coefficient | +0.083 %/°C - quantifies voltage drift per degree Celsius above 25 °C |
| Max Reverse Current | 10 μA @ VR = 12.8 V - leakage limit defining off-state integrity below breakdown |
| Operating Temp. | –65 °C to +175 °C - supports harsh-environment use in industrial and aerospace systems |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-lead package with cathode indicated by a single black band. Leads are tinned copper, solderable per MIL-STD-750 Method 2026. Weight: 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection in reverse-bias configuration | Must be held positive relative to anode to enter breakdown; polarity critical for regulation |
| Anode (unbanded end) | Zener cathode connection in reverse-bias configuration | Reference ground or return node; forms regulated output node when cathode is biased |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered DO-35 construction | Ensures mechanical and electrical interchangeability across qualified suppliers |
| RoHS-compliant plating (e3 option) | Meets environmental compliance without sacrificing solderability or reliability |
| Tape-and-reel packaging (TR suffix) | Enables automated SMT-compatible placement despite axial-lead form factor |
| Radiation-hardened design | Inherently radiation-tolerant per MicroNote 050 - suitable for space-qualified applications |
| ESD-insensitive (MIL-STD-750 Method 1020) | Eliminates need for handling precautions during assembly and testing |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 16 V reference to bias input stages of precision instrumentation amplifiers. IC Role / Device Role / Timing Role: Zener diode acts as two-terminal shunt reference, sinking excess current to hold node voltage constant. Use Value: Delivers ±10% initial accuracy and <0.1%/°C drift contribution over –40 °C to +85 °C ambient, enabling sub-mV offset stability. |
Use Scenario: Protecting ADC inputs from transient overvoltage events exceeding 16 V in automotive pressure sensor modules. IC Role / Device Role / Timing Role: Functions as passive crowbar clamp, conducting only when input exceeds 16 V + forward drop. Use Value: Limits peak clamped voltage to ≤17.5 V with <100 ns response, preserving downstream analog front-end integrity. |
| Low-Power Power Supply Regulation | Temperature-Stable Oscillator Biasing |
Use Scenario: Regulating 16 V rail for microcontroller reset circuitry in battery-backed industrial controllers. IC Role / Device Role / Timing Role: Shunt regulator maintains stable supply during brownout conditions by diverting excess current from series resistor. Use Value: Supports operation down to 7.8 mA minimum Zener current, ensuring regulation even at 100 μA standby loads. |
Use Scenario: Biasing varactor diodes in VCOs requiring thermally stable tuning voltage in RF test equipment. IC Role / Device Role / Timing Role: Provides temperature-compensated DC bias point using its known +0.083 %/°C coefficient matched against oscillator drift. Use Value: Enables <±50 ppm/°C net frequency drift reduction when used in compensated bias networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 12 V nominal, 1 W rating, DO-41 package, 22 Ω ZT @ 21 mA | Higher power, lower voltage, larger footprint - unsuitable for space-constrained 16 V references | Select only if higher power dissipation (>500 mW) and 12 V regulation are required |
| BZX55C16 | 16 V nominal, ±5% tolerance (C suffix), 500 mW, DO-35, 40 Ω ZT @ 5 mA | Tighter tolerance and lower impedance but no MIL screening or radiation hardness claims | Prefer for commercial-grade cost-sensitive designs where military specs are unnecessary |
Compared with 1N5246A/TR, 1N4742A offers higher power but mismatched voltage and package, while BZX55C16 delivers tighter tolerance and lower impedance at the expense of radiation hardness and extended temperature qualification - making 1N5246A/TR optimal for high-reliability, wide-temperature, or aerospace-critical 16 V regulation.
Availability
1N5246A/TR is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection, and low-power supply regulation requiring stable component supply across industrial control, aerospace subsystems, and test equipment manufacturing.
Supply support for 1N5246A/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-performance analog and mixed-signal components.
The 1N52xx series was designed specifically for ruggedized, low-power Zener regulation in military, aerospace, and industrial environments where wide temperature range, hermetic sealing, and long-term stability are mandatory.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5246A/TR?
The 1N5246A/TR has a nominal Zener voltage of 16 V with a ±10% tolerance, as indicated by the "A" suffix per Microsemi's documentation. This means the actual measured VZ at 7.8 mA test current falls between 14.4 V and 17.6 V across production units.
Does the 1N5246A/TR support military-grade screening?
Yes - the 1N5246A/TR can be ordered with MIL-PRF-19500 screening levels (JAN, JANTX, JANTXV, JANS) by adding MQ, MX, MV, or MSP prefixes respectively, provided the part number also includes the "-1" internal bond suffix. Standard 1N5246A/TR is commercial-grade unless explicitly screened.
What is the maximum power dissipation and thermal derating behavior of the 1N5246A/TR?
The 1N5246A/TR is rated for 500 mW at 25 °C ambient or lead temperature. Derating begins linearly above 25 °C at 4 mW/°C (250 °C/W junction-to-lead), reaching zero dissipation at 150 °C lead temperature - consistent with Figure 1 in the Microsemi datasheet.
Is the 1N5246A/TR RoHS compliant?
Yes - RoHS-compliant versions are available by specifying the "e3" suffix (e.g., 1N5246Ae3/TR), indicating annealed matte-tin plating per MIL-STD-750 Method 2026. Standard 1N5246A/TR may use tin-lead plating unless e3 is explicitly called out.
What does the "TR" suffix indicate in 1N5246A/TR?
The "TR" suffix denotes tape-and-reel packaging per EIA-296 standard, enabling automated pick-and-place assembly. It does not affect electrical or thermal specifications - the 1N5246A/TR retains identical Zener voltage, impedance, and temperature characteristics as the bulk version.
1N5246A/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:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 11.4 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)
1N5246A/TR FAQ
1.How can I place an order for 1N5246A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5246A/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 1N5246A/TR reliable?
The price and inventory of 1N5246A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5246A/TR is usually 5 days.
3.What payment methods are accepted for 1N5246A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5246A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5246A/TR?
1N5246A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5246A/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 1N5246A/TR?
For technical support, including 1N5246A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5246A/TR requirements.
6.How does Aetrix verify that 1N5246A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5246A/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 1N5246A/TR meets industry standards.
7.What is the process for return or replacement of 1N5246A/TR?
All 1N5246A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5246A/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 1N5246A/TR part is unused and in its original packaging.
Return procedure for 1N5246A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5246A/TR Tags
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MM5Z5V1ST1G
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