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Microchip Technology 1N746D
- Part No.:
- 1N746D
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
1N746D.pdf
- Description:
- ZENER DIODE
- Quantity:
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- Shipping:
Inventory:3,954
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Product details
Overview
1N746D from Microsemi is a 500 mW, 3.3 V ±1% tolerance silicon Zener diode in DO-35 glass axial package, qualified to JANTXV level per MIL-PRF-19500/127, with dynamic impedance of 24 Ω at 20 mA and temperature coefficient of –0.070 %/°C - used for precision voltage reference and regulation in military power supply monitoring circuits.
For engineers reviewing the 1N746D datasheet, 1N746D pinout, 1N746D application, or 1N746D equivalent, key selection factors include its 1% Zener voltage tolerance, hermetically sealed DO-35 package, JANTXV qualification, low dynamic impedance, and radiation-hardened construction per MicroNote 050.
Technical Context
The 1N746D operates as a reverse-biased voltage reference device with nominal Zener voltage of 3.3 V at 20 mA test current (IZT), exhibiting a negative temperature coefficient (–0.070 %/°C) indicating decreasing VZ with rising temperature. Its metallurgical bond construction ensures stable breakdown characteristics across –65 °C to +175 °C operating range.
It delivers regulated output under varying load and temperature conditions with maximum reverse leakage of 5 µA at 1.0 V and maximum Zener current of 120 mA. Thermal resistance is 250 °C/W junction-to-lead (0.375″ lead length) and 300 °C/W junction-to-ambient on PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.3 V at IZT = 20 mA - defines precise regulation point for low-voltage reference circuits |
| Zener Voltage Tolerance | ±1% - enables tighter system-level voltage accuracy vs. standard ±5% variants |
| Dynamic Impedance | 24 Ω at IZT - determines output voltage stability under load transients |
| Max Power Dissipation | 500 mW at TL = 50 °C - sets thermal design margin for axial-leaded mounting |
| Temp Coefficient αVZ | –0.070 %/°C - quantifies VZ drift over temperature; critical for wide-range operation |
| Reverse Leakage IR | 5 µA at VR = 1.0 V - defines minimum bias current needed to maintain regulation |
| Max Zener Current IZM | 120 mA - establishes safe DC current limit before thermal runaway |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-glass package with cathode indicated by 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 side; forward conduction path when biased positively |
| Cathode | Banded end | Connected to higher potential side during Zener operation; defines regulation polarity |
Key Features
| Feature | Design Value |
|---|---|
| JANTXV qualification | MIL-PRF-19500/127 certified for high-reliability military systems requiring extended temperature and radiation tolerance |
| 1% Zener tolerance | Enables tighter closed-loop feedback accuracy in precision analog regulators without trimming |
| Metallurgical bond construction | Ensures long-term parameter stability and reduced parameter drift under thermal cycling |
| Radiation hardness | Inherently radiation-hard per Microsemi MicroNote 050 - suitable for space-qualified subsystems |
| Low capacitance | Minimizes signal coupling in high-frequency bias networks and RF detector applications |
Applications
| Power Supply Reference | Aerospace Sensor Biasing |
|---|---|
Use Scenario: Stable 3.3 V reference for op-amp feedback networks in DC-DC converter error amplifiers. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed regulation node for comparator threshold setting. Use Value: ±1% tolerance and –0.070 %/°C TC ensure <±20 mV drift over –55 °C to +125 °C, meeting MIL-STD-704E line regulation specs. | Use Scenario: Biasing bridge sensors in inertial measurement units exposed to cosmic radiation. IC Role / Device Role / Timing Role: Radiation-hardened voltage reference stabilizing Wheatstone bridge excitation voltage. Use Value: Inherent radiation hardness and JANTXV qualification eliminate need for shielding or derating in LEO missions. |
| Test Equipment Calibration | Military Radio Front-End |
Use Scenario: Primary reference in handheld multimeter analog section requiring traceable voltage standards. IC Role / Device Role / Timing Role: Precision shunt regulator establishing calibration-grade 3.3 V node for ADC reference buffers. Use Value: 24 Ω dynamic impedance and 5 µA leakage at 1 V enable sub-0.01% linearity in 3½-digit DMM designs. | Use Scenario: Local regulation for RF amplifier bias rails in tactical HF transceivers operating in extreme environments. IC Role / Device Role / Timing Role: Low-noise Zener source supplying stable gate voltage to GaAs FET driver stages. Use Value: Hermetic DO-35 package and –65 °C to +175 °C rating support operation in unheated vehicle-mounted radios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N746A-1 | ±5% Zener tolerance, same VZ = 3.3 V, identical DO-35 package and JANTXV qualification | Lower accuracy requirement; acceptable where ±165 mV variation is tolerable | Select when cost sensitivity outweighs precision needs and full 1% tolerance is unnecessary |
| 1N746C-1 | ±2% Zener tolerance, same VZ = 3.3 V, identical package and qualification level | Moderate accuracy demand; balances cost and performance between A and D grades | Choose for industrial control systems needing better than ±5% but not requiring full 1% spec |
Compared with 1N746A-1 and 1N746C-1, the 1N746D provides the tightest voltage tolerance (±1%) while retaining identical military qualification, thermal ratings, and package - making it optimal for calibration-critical or radiation-exposed applications where parameter stability is non-negotiable.
Availability
1N746D is available at Aetrix Electronics and suitable for military avionics power monitoring, aerospace sensor biasing, and test equipment calibration requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N746D 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 defense-qualified components.
The 1N746D belongs to Microsemi's legacy MIL-PRF-19500/127-qualified Zener diode family, designed specifically for precision voltage regulation in mission-critical military, aerospace, and industrial systems where long-term stability and environmental resilience are mandatory.
FAQ
What is the Zener voltage and tolerance of the 1N746D?
The 1N746D has a nominal Zener voltage of 3.3 V at 20 mA test current (IZT) with a tight ±1% tolerance. This means its actual breakdown voltage falls within 3.267 V to 3.333 V at 25 °C, enabling high-accuracy voltage referencing in precision analog circuits where standard ±5% Zeners would introduce unacceptable error.
Is the 1N746D qualified to military specifications?
Yes, the 1N746D is qualified to JANTXV level per MIL-PRF-19500/127, confirming compliance with rigorous environmental, reliability, and screening requirements including extended temperature operation (–65 °C to +175 °C), hermetic sealing, and radiation hardness per Microsemi MicroNote 050 - making it suitable for deployed military platforms.
What package type does the 1N746D use?
The 1N746D uses the DO-35 (DO-204AH) hermetically sealed axial-leaded glass package with cathode identified by a band. Its dimensions conform to JEDEC standards, with body diameter 1.40–2.29 mm and lead length 25.4–38.1 mm, supporting through-hole mounting and compatibility with legacy military board assemblies.
How does the temperature coefficient affect 1N746D performance?
The 1N746D has a temperature coefficient of –0.070 %/°C, meaning its Zener voltage decreases by approximately 2.31 mV/°C near 3.3 V. This predictable negative drift must be accounted for in wide-temperature designs; however, its consistency supports compensation in high-stability references where linear TC behavior is preferable to zero-TC variants with higher impedance.
Can the 1N746D be used in surface-mount applications?
No - the 1N746D is exclusively offered in the axial DO-35 through-hole package. For surface-mount equivalents, Microsemi offers MELF versions (e.g., 1N746AUR-1), but the 1N746D itself is not available in SMT form. Designers requiring SMT must select alternate part numbers or use adapter solutions, as no RoHS-compliant or tape-and-reel variants exist for the 1N746D.
1N746D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
1N746D FAQ
1.How can I place an order for 1N746D through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N746D 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 1N746D reliable?
The price and inventory of 1N746D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N746D is usually 5 days.
3.What payment methods are accepted for 1N746D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N746D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N746D?
1N746D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N746D 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 1N746D?
For technical support, including 1N746D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N746D requirements.
6.How does Aetrix verify that 1N746D is sourced from the original manufacturer or authorized distributors?
All 1N746D 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 1N746D meets industry standards.
7.What is the process for return or replacement of 1N746D?
All 1N746D units undergo pre-shipment inspection (PSI). If there is an issue with 1N746D, 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 1N746D part is unused and in its original packaging.
Return procedure for 1N746D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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