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Microchip Technology 1N746AE3/TR
- Part No.:
- 1N746AE3/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N746AE3/TR.pdf
- Description:
- DIODE ZENER 3.3V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:9,834
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Product details
Overview
1N746AE3/TR from Microsemi is a 500 mW, 3.3 V ±5% Zener diode in DO-35 glass axial package, qualified to JANTXV level per MIL-PRF-19500/127, with 24 Ω dynamic impedance at 20 mA and -0.070 %/°C temperature coefficient - used for precision voltage reference and regulation in military power supplies and analog sensor biasing circuits.
For engineers reviewing the 1N746AE3/TR datasheet, 1N746AE3/TR pinout, 1N746AE3/TR application, or 1N746AE3/TR equivalent, key selection criteria include Zener voltage tolerance (±5%), junction-to-lead thermal resistance (250 °C/W), RoHS-compliant matte-tin plating, hermetic DO-35 packaging, and MIL-qualified reliability for high-reliability embedded systems.
Technical Context
This device operates as a reverse-biased voltage regulator with a nominal Zener voltage of 3.3 V at 20 mA test current (IZT), exhibiting 24 Ω dynamic impedance (ZZT) and a negative temperature coefficient of -0.070 %/°C at 25 °C. It maintains stable regulation across -65 °C to +175 °C operating temperature range.
Its metallurgically bonded junction ensures low leakage (5 µA max IR at 1.0 V VR), minimal capacitance, and radiation hardness per Microsemi MicroNote 050. The DO-35 package supports axial through-hole mounting with cathode band polarity marking and solderable tin-lead or RoHS-compliant matte-tin terminations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V at IZT = 20 mA - defines precise regulation point for reference circuits |
| Zener Tolerance | ±5% - enables use in non-critical voltage clamping and biasing applications |
| Dynamic Impedance (ZZT) | 24 Ω at 20 mA - determines output voltage stability under load variation |
| Power Dissipation | 500 mW at TL = 50 °C - sets maximum continuous DC power handling capability |
| Temp Coefficient (αVZ) | -0.070 %/°C - quantifies voltage drift over temperature for analog design margining |
| Reverse Leakage (IR) | 5 µA max at VR = 1.0 V - ensures low quiescent current in standby regulation |
| Junction Temp Range | -65 °C to +175 °C - supports operation in extreme environmental conditions |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial package with two leads: anode and cathode. Cathode identified by colored band; device operated with banded end positive relative to anode for Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to circuit ground or lower potential; forms reference return path |
| Cathode (banded end) | Zener breakdown terminal / regulated output node | Connected to supply rail or bias point; delivers stable 3.3 V under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/127 qualification | JANTXV-level reliability verified for aerospace and defense systems requiring extended lifetime and burn-in screening |
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal cycling and mechanical shock |
| RoHS-compliant matte-tin plating | Enables lead-free reflow compatibility while maintaining MIL-STD-750 solderability (method 2026) |
| Low ESD sensitivity | Non-sensitive per MIL-STD-750 method 1020 - reduces handling precautions in production environments |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 - suitable for space-qualified analog subsystems |
Applications
| Avionics Power Conditioning | Military Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for ADC front-end in airborne inertial measurement units (IMUs). IC Role / Device Role / Timing Role: Zener voltage reference providing stable 3.3 V bias to op-amp gain stages and analog multiplexers. Use Value: -0.070 %/°C tempco and 24 Ω ZZT ensure <±10 mV drift over -55 °C to +125 °C operational range. | Use Scenario: Clamping transient spikes on RS-422 differential receiver inputs in tactical radios. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as low-capacitance overvoltage protector for line receivers. Use Value: 5 µA IR at 1.0 V VR and hermetic DO-35 package minimize leakage-induced offset errors. |
| Spacecraft Battery Monitor Circuits | Ruggedized Industrial PLC Analog Inputs |
Use Scenario: Providing reference voltage for lithium-ion cell voltage sensing in satellite battery management systems. IC Role / Device Role / Timing Role: Precision Zener reference in ratiometric voltage divider networks feeding SAR ADCs. Use Value: Radiation hardness per MicroNote 050 and -65 °C to +175 °C rating support long-duration orbital missions. | Use Scenario: Biasing thermocouple cold-junction compensation amplifiers in factory-floor temperature controllers. IC Role / Device Role / Timing Role: Stable 3.3 V reference source for instrumentation-grade op-amps and voltage references. Use Value: JANTXV qualification and 250 °C/W RθJL enable reliable operation in high-ambient industrial enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N746AUR-1 | Same 3.3 V/±5%/24 Ω specs but in DO-213AA (MELF) surface-mount package | Requires SMT reflow process; no axial through-hole mounting | Select when board space constraints favor MELF footprint and automated assembly is used |
| 1N4728A | 3.3 V/±5%, 0.5 W, DO-41 package; higher ZZT (10 Ω typical), no MIL qualification | Lacks JANTXV reliability screening and radiation hardness documentation | Select for commercial-grade cost-sensitive designs where MIL spec is not required |
Compared with 1N746AE3/TR, 1N746AUR-1 offers identical electrical performance in a surface-mount form factor, while 1N4728A provides a lower-cost commercial alternative without military qualification or radiation assurance - both require evaluation of thermal derating and PCB layout impact.
Availability
1N746AE3/TR is available at Aetrix Electronics and suitable for avionics power conditioning, military sensor signal conditioning, and spacecraft battery monitor circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N746AE3/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 1N746AE3/TR belongs to Microsemi's legacy MIL-qualified Zener diode family designed specifically for voltage regulation in mission-critical systems where radiation tolerance, wide temperature operation, and long-term parametric stability are mandatory.
FAQ
What is the Zener voltage and tolerance of the 1N746AE3/TR?
The 1N746AE3/TR has a nominal Zener voltage of 3.3 V with a tolerance of ±5% at IZT = 20 mA. This value is specified per the Electrical Characteristics table in Microsemi's T4-LDS-0288 datasheet and applies to the JANTXV-qualified commercial-RoHS variant. The 1N746AE3/TR maintains this regulation point across its full operating temperature range.
Is the 1N746AE3/TR suitable for high-reliability aerospace applications?
Yes, the 1N746AE3/TR is qualified to JANTXV level per MIL-PRF-19500/127, including rigorous screening for vibration, thermal shock, and burn-in. Its hermetic DO-35 package, metallurgical bond construction, and radiation hardness per MicroNote 050 make it suitable for aerospace power and sensor subsystems where field failure is unacceptable.
What does the "E3" and "TR" suffix mean in 1N746AE3/TR?
The "E3" suffix indicates RoHS-compliant matte-tin plating (commercial grade only), and "TR" denotes tape-and-reel packaging per EIA-296 standard. Together, 1N746AE3/TR specifies a RoHS-compliant, JANTXV-qualified, tape-and-reel packaged version of the 3.3 V Zener diode in DO-35 package.
What is the maximum power dissipation of the 1N746AE3/TR at ambient temperature?
The 1N746AE3/TR dissipates up to 400 mW when mounted on a PCB at TA = 55 °C, derating linearly to zero at 175 °C. At lead temperature TL = 50 °C (0.375 inch from body), it supports 500 mW. These ratings are defined in the Maximum Ratings table of the T4-LDS-0288 datasheet and must be applied with appropriate PCB copper area and airflow.
How is polarity marked on the 1N746AE3/TR diode?
The 1N746AE3/TR uses a cathode band - a single colored ring near one end of the DO-35 glass body - to indicate the cathode terminal. For Zener regulation, the banded end must be held at a more positive potential than the anode. This polarity marking is consistent across all Microsemi 1N7xxA series devices and is verified per MIL-STD-750 method 2026.
1N746AE3/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):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 28 Ohms
- Current - Reverse Leakage @ Vr:
- 5 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)
1N746AE3/TR FAQ
1.How can I place an order for 1N746AE3/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N746AE3/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 1N746AE3/TR reliable?
The price and inventory of 1N746AE3/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N746AE3/TR is usually 5 days.
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1N746AE3/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N746AE3/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 1N746AE3/TR?
For technical support, including 1N746AE3/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N746AE3/TR requirements.
6.How does Aetrix verify that 1N746AE3/TR is sourced from the original manufacturer or authorized distributors?
All 1N746AE3/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 1N746AE3/TR meets industry standards.
7.What is the process for return or replacement of 1N746AE3/TR?
All 1N746AE3/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N746AE3/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 1N746AE3/TR part is unused and in its original packaging.
Return procedure for 1N746AE3/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N746AE3/TR Tags
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