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Microchip Technology 1N747A/TR
- Part No.:
- 1N747A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N747A/TR.pdf
- Description:
- DIODE ZENER 3.6V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:9,954
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Product details
Overview
1N747A/TR from Microsemi is a 500 mW, 3.6 V ±5% axial-leaded silicon Zener diode in DO-35 (DO-204AH) glass package, qualified to JANTX level per MIL-PRF-19500/127, with 22 Ω dynamic impedance at 20 mA and -0.065 %/°C temperature coefficient - used for precision voltage regulation in military power supplies and analog reference circuits.
For engineers reviewing the 1N747A/TR datasheet, 1N747A/TR pinout, 1N747A/TR application, or 1N747A/TR equivalent, this page delivers verified electrical parameters, military-grade qualification status, thermal derating behavior, DO-35 mechanical dimensions, and RoHS-compliant commercial availability with TR tape-and-reel packaging.
Technical Context
The 1N747A/TR operates as a reverse-biased voltage reference diode with nominal Zener voltage of 3.6 V at 20 mA test current (IZT), exhibiting low dynamic impedance (22 Ω) and tight thermal stability (-0.065 %/°C). It maintains regulation across -65 °C to +175 °C junction temperature range.
Its hermetically sealed DO-35 glass package features internal metallurgical bonding, tin-lead or RoHS-compliant matte-tin plating, and cathode band polarity marking. The device is rated for 0.5 W average power dissipation at 50 °C lead temperature, derating linearly to zero at 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.6 V at IZT = 20 mA - defines stable regulation point for low-voltage reference designs |
| Zener Tolerance | ±5% - ensures predictable voltage window without requiring post-selection trimming |
| Dynamic Impedance | 22 Ω at IZT = 20 mA - limits output voltage variation under load current changes |
| Max Power Dissipation | 0.5 W at TL = 50 °C - sets thermal design boundary for lead-mounted PCB layouts |
| Temp Coefficient αVZ | -0.065 %/°C - enables predictable drift compensation in wide-temperature environments |
| Reverse Leakage IR | 3 µA at VR = 1.0 V - confirms low standby current in high-impedance bias networks |
| Junction Temp Range | -65 °C to +175 °C - supports operation in aerospace, downhole, and defense electronics |
Pinout & Package
Package: DO-35 (DO-204AH), axial-leaded, hermetically sealed glass case with cathode indicated by colored 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; forward conduction path when biased positively |
| Cathode | Banded end | Connected to higher-potential node during Zener regulation; defines reference output node |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/127 Qualification | JANTX-level screening ensures reliability for defense and space-qualified systems |
| Internal Metallurgical Bond | Enhances thermal cycling endurance and long-term parameter stability vs. epoxy-bonded alternatives |
| Low Capacitance | Minimizes signal coupling in RF bias and high-speed switching applications |
| ESD Robustness | Non-sensitive per MIL-STD-750 method 1020 - eliminates need for external ESD protection in board layout |
| Radiation Hardness | Inherently radiation tolerant per Microsemi MicroNote 050 - suitable for low-dose space environments |
Applications
| Avionics Power Monitoring | Military Radio Biasing |
|---|---|
Use Scenario: Stable 3.6 V reference for ADC input scaling in airborne environmental sensors. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed threshold for analog-to-digital conversion. Use Value: -0.065 %/°C tempco ensures <±1.5% total error over -55 °C to +125 °C operating range. | Use Scenario: Bias voltage source for RF amplifier stages in handheld tactical radios. IC Role / Device Role / Timing Role: Low-noise DC reference generator stabilizing transistor operating points. Use Value: 22 Ω dynamic impedance maintains <50 mV output ripple under 10–30 mA load transients. |
| Downhole Instrumentation | Secure Crypto Module Reference |
Use Scenario: Voltage clamp in high-temp wellhead control units exposed to 150 °C ambient. IC Role / Device Role / Timing Role: Overvoltage protection and regulation element in isolated sensor front-ends. Use Value: Rated operation up to +175 °C junction temperature enables direct mounting near heat sources. | Use Scenario: Tamper-resistant voltage reference for hardware security keys in encrypted comms modules. IC Role / Device Role / Timing Role: Physically unclonable reference node hardened against probing and fault injection. Use Value: Hermetic DO-35 glass package and JANTX qualification provide resistance to decapsulation and parametric manipulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4729A | 3.6 V ±5%, 1 W rating, DO-41 package, no military qualification | Commercial-only use; lacks MIL-PRF-19500 screening and extended temp range | Select when cost sensitivity outweighs reliability requirements and thermal margin exceeds 0.5 W |
| BZX55C3V6 | 3.6 V ±5%, 500 mW, DO-35, AEC-Q200 qualified, not MIL-qualified | Automotive-grade alternative; no JANTX screening or radiation hardness data | Choose for automotive ECUs where industrial temp range suffices and RoHS compliance is mandatory |
Compared with 1N747A/TR, 1N4729A offers higher power but no military screening, while BZX55C3V6 provides automotive qualification but omits radiation tolerance and extreme-temperature validation - making 1N747A/TR uniquely suited for defense and aerospace voltage references requiring guaranteed reliability under stress.
Availability
1N747A/TR is available at Aetrix Electronics and suitable for avionics power monitoring, military radio biasing, and downhole instrumentation requiring stable component supply across extended temperature and lifecycle demands.
Supply support for 1N747A/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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and military-qualified components for aerospace, defense, and industrial markets.
The 1N747A/TR belongs to Microsemi's legacy MIL-PRF-19500/127-qualified Zener diode family, designed specifically for precision voltage regulation in mission-critical systems where parameter stability, thermal resilience, and long-term reliability are non-negotiable.
FAQ
What is the Zener voltage and tolerance of the 1N747A/TR?
The 1N747A/TR has a nominal Zener voltage of 3.6 V at 20 mA test current (IZT), with a tolerance of ±5% as indicated by the "A" suffix in its nomenclature. This tolerance is confirmed in the Electrical Characteristics table on page 3 of Microsemi's T4-LDS-0288 datasheet, and applies across the full operating temperature range.
Is the 1N747A/TR qualified to military standards?
Yes, the 1N747A/TR is qualified to JANTX level per MIL-PRF-19500/127, as explicitly stated in the DESCRIPTION section of the datasheet. This includes screening for vibration, shock, temperature cycling, and burn-in - distinguishing it from commercial-only variants like the RoHS-compliant "e3" versions.
What package type does the 1N747A/TR use?
The 1N747A/TR uses the DO-35 (DO-204AH) axial-leaded, hermetically sealed glass package. Mechanical dimensions, including body diameter (0.055–0.090 inch), body length (0.120–0.200 inch), and lead diameter (0.018–0.023 inch), are specified on page 6 of the T4-LDS-0288 datasheet.
Does the 1N747A/TR have RoHS compliance?
The 1N747A/TR is available in both RoHS-compliant (e3 suffix) and non-RoHS versions, but RoHS compliance applies only to commercial-grade units - JANTX-qualified units like the 1N747A/TR retain traditional tin-lead plating per MIL-STD-750 method 2026 unless otherwise specified in ordering documentation.
What is the maximum power dissipation for the 1N747A/TR?
The 1N747A/TR has an average rated power dissipation of 0.5 W at a lead temperature (TL) of +50 °C with 0.375 inch lead length, derating linearly to zero at +175 °C. When mounted on a PCB, it is rated for 0.4 W at +55 °C ambient, per the Maximum Ratings table on page 1 of the datasheet.
1N747A/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 24 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-7 (DO-204AA)
1N747A/TR FAQ
1.How can I place an order for 1N747A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N747A/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 1N747A/TR reliable?
The price and inventory of 1N747A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N747A/TR is usually 5 days.
3.What payment methods are accepted for 1N747A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N747A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N747A/TR?
1N747A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N747A/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 1N747A/TR?
For technical support, including 1N747A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N747A/TR requirements.
6.How does Aetrix verify that 1N747A/TR is sourced from the original manufacturer or authorized distributors?
All 1N747A/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 1N747A/TR meets industry standards.
7.What is the process for return or replacement of 1N747A/TR?
All 1N747A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N747A/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 1N747A/TR part is unused and in its original packaging.
Return procedure for 1N747A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N747A/TR Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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