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Microchip Technology 1N747D/TR
- Part No.:
- 1N747D/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N747D/TR.pdf
- Description:
- DIODE ZENER 3.6V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:7,048
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Product details
Overview
1N747D/TR from Microsemi is a 500 mW, 3.6 V ±1% tolerance silicon Zener diode in DO-35 glass axial package, qualified to JANTXV level per MIL-PRF-19500/127, with 22 Ω dynamic impedance at 30 mA and -0.065 %/°C temperature coefficient - used for precision voltage reference and regulation in military power supply monitoring circuits.
For engineers reviewing the 1N747D/TR datasheet, 1N747D/TR pinout, 1N747D/TR application, or 1N747D/TR equivalent, this page delivers verified electrical specs, military-grade thermal derating behavior, DO-35 terminal polarity marking, RoHS-compliant commercial variant availability, and direct alternatives with documented Zener voltage tolerance and temperature coefficient differences.
Technical Context
The 1N747D/TR operates as a reverse-biased voltage reference device with a nominal Zener voltage of 3.6 V at 30 mA test current (IZT), exhibiting low dynamic impedance (22 Ω) and tight ±1% initial tolerance (denoted by 'D' suffix). Its metallurgically bonded junction ensures stable breakdown characteristics across -65°C to +175°C operating range.
It features a cathode band marking for unambiguous polarity, requires banded end to be positive during regulation, and maintains minimal capacitance and ESD insensitivity per MIL-STD-750 method 1020 - enabling use in high-reliability analog signal conditioning and biasing where long-term voltage stability under thermal stress is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 3.6 V at IZT = 30 mA - defines precise regulation point for low-voltage reference circuits |
| Zener Tolerance | ±1% - enables tighter system-level voltage margin control vs. standard ±5% variants |
| Dynamic Impedance ZZT | 22 Ω at 30 mA - determines output voltage variation under load current changes |
| Max Power Dissipation | 500 mW at TL = 50°C (0.375″ lead length) - sets thermal design boundary for PCB layout |
| Temp Coefficient αVZ | -0.065 %/°C - quantifies voltage drift over temperature; negative slope aids compensation in multi-diode networks |
| Reverse Leakage IR | 3 µA at VR = 1.0 V - confirms low standby current in battery-powered sensing nodes |
| Forward Voltage VF | 1.1 V at IF = 200 mA - supports bidirectional protection or dual-mode circuit integration |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial package with tin-lead or RoHS-compliant matte-tin plating; cathode indicated by single black band on body; leads solderable per MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current sink in forward bias; reference ground node in Zener mode | Connected to system ground or lower-potential rail during regulation |
| Cathode (banded end) | Regulated output node in reverse bias; current source in forward bias | Applied positive potential relative to anode to activate Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| JANTXV qualification | MIL-PRF-19500/127 certified for aerospace and defense systems requiring extended reliability screening |
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal cycling, ensuring long-term Zener voltage stability |
| Low capacitance | Enables use in high-frequency noise filtering and RF bias networks without signal degradation |
| Radiation hardness | Inherently resistant to total ionizing dose (TID), per Microsemi MicroNote 050 - suitable for space-qualified designs |
| ESD insensitivity | Non-sensitive per MIL-STD-750 method 1020 - reduces handling sensitivity in production environments |
Applications
| Avionics Power Monitoring | Test Equipment Reference |
|---|---|
Use Scenario: Monitoring regulated 3.3 V rail in flight control computer power modules under wide temperature excursions. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 3.6 V threshold for comparator-based undervoltage lockout (UVLO). Use Value: ±1% tolerance and -0.065 %/°C TC ensure UVLO trip point remains within 25 mV over -55°C to +125°C ambient. | Use Scenario: Calibrating benchtop multimeter front-end ADC reference in metrology-grade instruments. IC Role / Device Role / Timing Role: Precision shunt reference establishing known 3.6 V baseline for analog-to-digital conversion accuracy verification. Use Value: 22 Ω dynamic impedance minimizes loading error when sourcing <1 mA into reference buffer amplifier. |
| Industrial Sensor Biasing | Military Radio Front-End |
Use Scenario: Providing stable bias voltage to MEMS pressure sensor bridge in oil-field downhole telemetry units. IC Role / Device Role / Timing Role: Low-noise Zener regulator supplying excitation voltage to Wheatstone bridge elements. Use Value: Hermetic DO-35 package and -65°C to +175°C rating withstand extreme thermal shock during drilling operations. | Use Scenario: Clamping transient voltages on 5 V supply lines feeding RF power amplifier stages in manpack radios. IC Role / Device Role / Timing Role: Transient suppression element leveraging fast Zener turn-on and low capacitance to protect sensitive GaAs MMICs. Use Value: Minimal capacitance avoids detuning of matching networks while maintaining 3.6 V clamping threshold under ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N747C/TR | ±2% tolerance (C suffix), same VZ = 3.6 V, identical DO-35 package and thermal specs | Lower cost for non-critical references where ±2% margin suffices | Select when system-level calibration compensates for wider initial tolerance |
| 1N747A/TR | ±5% tolerance (A suffix), otherwise identical electrical and mechanical specifications | Used in legacy designs or cost-sensitive industrial controls with relaxed voltage accuracy | Choose only if downstream regulation or feedback loop corrects for initial VZ variance |
Compared with 1N747C/TR and 1N747A/TR, the 1N747D/TR provides the tightest initial voltage accuracy (±1%), directly reducing calibration effort in high-precision instrumentation and enabling single-point trimming in avionics power monitors - without altering PCB layout or thermal management.
Availability
1N747D/TR is available at Aetrix Electronics and suitable for avionics power monitoring, test equipment reference, industrial sensor biasing, and military radio front-end applications requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N747D/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 analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N747D/TR belongs to Microsemi's legacy MIL-PRF-19500/127 qualified Zener diode family, designed specifically for voltage regulation and reference in mission-critical systems where long-term stability, radiation tolerance, and extreme temperature operation are mandatory.
FAQ
What is the Zener voltage and test current for the 1N747D/TR?
The 1N747D/TR has a nominal Zener voltage of 3.6 V measured at a test current (IZT) of 30 mA. This value is guaranteed within ±1% tolerance at 25°C, and the device maintains stable regulation across its full operating temperature range of -65°C to +175°C. The 1N747D/TR uses a metallurgically bonded junction to preserve this specification under thermal stress.
Is the 1N747D/TR RoHS compliant?
The 1N747D/TR is not RoHS compliant, as the 'TR' suffix denotes tape-and-reel packaging of the standard military-grade part, which retains tin-lead plating. RoHS-compliant versions (e3 suffix) are available only for commercial-grade variants (e.g., 1N747DUR-1), not for JANTXV-qualified 1N747D/TR. Always verify plating specification against orderable part number before procurement.
What does the 'D' in 1N747D/TR signify?
The 'D' in 1N747D/TR indicates ±1% Zener voltage tolerance, per Microsemi's part nomenclature. It follows the JEDEC 1N747 base type and precedes the '-1' metallurgical bond designation and 'TR' tape-and-reel packaging suffix. This tight tolerance distinguishes the 1N747D/TR from ±2% (C) and ±5% (A) variants in the same voltage grade.
How is polarity marked on the 1N747D/TR?
The 1N747D/TR uses a single black cathode band on the glass DO-35 body to indicate polarity. During Zener regulation, the banded (cathode) end must be held at a higher potential than the unbanded (anode) end. This marking is consistent across all Microsemi 1N7xx series diodes and aligns with JEDEC standard orientation for axial-leaded Zeners.
What is the maximum power dissipation of the 1N747D/TR at 75°C ambient?
When mounted on a standard FR4 PCB with 1 oz copper, the 1N747D/TR's maximum rated power dissipation linearly derates from 400 mW at 55°C ambient to zero at 175°C. At 75°C ambient, its usable power is approximately 333 mW - calculated using the published derating curve in Figure 2 of T4-LDS-0288. Lead-length thermal resistance (250 °C/W) applies only for lead-temperature-limited mounting.
1N747D/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):
- 3.6 V
- Tolerance:
- ±1%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 24 Ohms
- Current - Reverse Leakage @ Vr:
- 10 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-204AH (DO-35)
1N747D/TR FAQ
1.How can I place an order for 1N747D/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N747D/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 1N747D/TR reliable?
The price and inventory of 1N747D/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N747D/TR is usually 5 days.
3.What payment methods are accepted for 1N747D/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N747D/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N747D/TR?
1N747D/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N747D/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 1N747D/TR?
For technical support, including 1N747D/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N747D/TR requirements.
6.How does Aetrix verify that 1N747D/TR is sourced from the original manufacturer or authorized distributors?
All 1N747D/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 1N747D/TR meets industry standards.
7.What is the process for return or replacement of 1N747D/TR?
All 1N747D/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N747D/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 1N747D/TR part is unused and in its original packaging.
Return procedure for 1N747D/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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