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Microchip Technology 1N4462US/TR
- Part No.:
- 1N4462US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, A
- Datasheet:
-
1N4462US/TR.pdf
- Description:
- DIODE ZENER 7.5V 1.5W D5A
- Quantity:
- Payment:
- Shipping:
Inventory:99
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Product details
Overview
1N4462US/TR from Microsemi is a hermetically sealed, voidless glass MELF surface-mount Zener diode rated for 1.5 W steady-state power dissipation, with a nominal Zener voltage of 7.5 V at 34 mA test current, 2.5 Ω dynamic impedance, and operating junction temperature range of –65 °C to +175 °C. It serves as a precision voltage reference or regulator in high-reliability military and aerospace power conditioning circuits.
For engineers reviewing the 1N4462US/TR datasheet, 1N4462US/TR pinout, 1N4462US/TR application, or 1N4462US/TR equivalent, key selection criteria include its MIL-PRF-19500/406 qualification (JAN/JANTXV levels), 5% voltage tolerance, Category 1 internal metallurgical bond, and thermal resistance of 20 °C/W junction-to-end cap.
Technical Context
This device operates in reverse breakdown to maintain stable voltage across wide current (1.0 mA to 191 mA) and temperature ranges. Its voidless glass construction and triple-layer passivation ensure long-term stability under thermal cycling and radiation exposure.
The 1N4462US/TR uses a tungsten slug end-cap package with tin/lead or RoHS-compliant matte tin terminations, cathode indicated by a band, and is qualified to MIL-PRF-19500/406 for JAN, JANTX, JANTXV, and JANS reliability levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±5% at 34 mA - defines regulation setpoint for precision biasing |
| Power Dissipation (PD) | 1.5 W @ TA = 25 °C - supports continuous operation in compact, conduction-cooled layouts |
| Dynamic Impedance (ZZT) | 2.5 Ω @ IZT = 34 mA - ensures low output voltage variation under load transients |
| Junction Temperature Range | –65 °C to +175 °C - enables deployment in extreme environmental conditions |
| Thermal Resistance (RθJEC) | 20 °C/W - allows accurate thermal modeling when mounted to metalized PCB pads or heat sinks |
| Reverse Leakage (IR) | 0.5 µA @ 5.46 V - guarantees minimal quiescent current in low-power standby modes |
| Forward Voltage (VF) | 1.0 V @ 200 mA - supports use as clamping diode in bidirectional protection schemes |
Pinout & Package
Package: A (D-5A) MELF - hermetically sealed voidless glass case with tungsten slugs; cathode identified by single polarity band; weight 193 mg; dimensions BD = 0.091–0.103 in (2.31–2.62 mm), BL = 0.168–0.200 in (4.28–5.08 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in Zener configuration | Connected to ground or lower-potential node when used as shunt regulator |
| Cathode | Reverse breakdown terminal / high-side connection in Zener configuration | Marked with band; connected to input rail to clamp or regulate voltage |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and internal corrosion over 20+ year service life in sealed enclosures |
| Category 1 metallurgical bond | Ensures mechanical integrity under shock/vibration up to 100 g and thermal cycling beyond 1000 cycles |
| MIL-PRF-19500/406 qualification | Validates performance to military screening including burn-in, temperature cycling, and lot acceptance testing |
| Triple-layer passivation | Suppresses surface leakage currents and enhances stability in high-humidity or contaminated environments |
| Non-sensitive to ESD | Withstands >4 kV HBM per MIL-STD-750 Method 1020 without parameter shift or failure |
Applications
| Avionics Power Supply Regulation | Satellite Onboard Computer Reference |
|---|---|
Use Scenario: Regulating auxiliary 5–12 V rails in flight-critical avionics modules where voltage drift must remain below ±10 mV over –55 °C to +125 °C. IC Role / Device Role / Timing Role: Shunt Zener reference providing stable bias to op-amps and ADC references. Use Value: 7.5 V nominal voltage with <2.5 Ω dynamic impedance maintains regulation accuracy despite input ripple and load step changes. | Use Scenario: Providing primary voltage reference for radiation-tolerant ADCs and DACs in LEO satellite payloads. IC Role / Device Role / Timing Role: Precision voltage reference element in analog front-end signal chains. Use Value: Inherent radiation hardness per MicroNote 050 and –65 °C to +175 °C junction rating support unmitigated operation in space vacuum and thermal extremes. |
| Tactical Radio Transceiver Biasing | Nuclear Instrumentation Front-End Protection |
Use Scenario: Establishing stable local oscillator and mixer bias points in handheld SDR radios exposed to rapid ambient temperature swings. IC Role / Device Role / Timing Role: Zener shunt regulator for RF IC bias networks requiring low-noise, low-drift DC sources. Use Value: 5% tolerance and <0.5 µA leakage at 73% of VZ minimize current draw and thermal self-heating in battery-powered units. | Use Scenario: Clamping transient overvoltage on sensor inputs in reactor monitoring systems where failure is unacceptable. IC Role / Device Role / Timing Role: Overvoltage protection element safeguarding high-impedance amplifier inputs. Use Value: 1.5 W surge capability and 174 mA maximum continuous Zener current enable robust handling of EMI-induced spikes without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4462US | Same electrical specs and package; differs only in packaging format (bulk vs. tape-and-reel) | No functional difference; identical qualification level and reliability screening | Select 1N4462US/TR for automated SMT assembly; choose 1N4462US for manual prototyping or low-volume hand-soldering |
| 1N4462 | Same Zener voltage and power rating but non-hermetic DO-41 axial package; no MIL-PRF-19500 qualification | Limited to commercial-grade industrial applications; unsuitable for aerospace or defense deployments | Choose 1N4462 only for cost-sensitive, non-military designs where hermeticity and extended temperature range are not required |
Compared with 1N4462US/TR, the 1N4462US offers identical performance in tape-and-reel form factor for production lines, while the legacy 1N4462 provides lower-cost access to the same Zener voltage in through-hole format-but without hermetic sealing or military qualification.
Availability
1N4462US/TR is available at Aetrix Electronics and suitable for avionics power supply regulation, satellite onboard computer reference, and tactical radio transceiver biasing requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4462US/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 1N4462US/TR belongs to Microsemi's military-qualified Zener diode family designed specifically for voltage regulation in mission-critical systems where failure is not an option-emphasizing hermeticity, radiation tolerance, and extended temperature operation.
FAQ
What is the Zener voltage tolerance for the 1N4462US/TR?
The 1N4462US/TR has a nominal Zener voltage of 7.5 V with a standard tolerance of ±5%, as specified in the Electrical Characteristics table on page 3 of the T4-LDS-0183-1 datasheet. Tighter tolerances (±2% or ±1%) are available under different suffixes (C or D), but the /TR variant corresponds to the standard 5% version.
Is the 1N4462US/TR RoHS compliant?
The 1N4462US/TR is available in both RoHS-compliant and non-RoHS versions. Per the nomenclature guide on page 2, RoHS compliance is indicated by the "e3" suffix (e.g., 1N4462US e3 /TR); the base part number without "e3" denotes standard Sn/Pb termination. Commercial-grade units support RoHS; military-grade (JAN/JANTXV) versions do not.
What does the "/TR" suffix mean in 1N4462US/TR?
The "/TR" suffix in 1N4462US/TR indicates tape-and-reel packaging per EIA-481-B standard, optimized for automated surface-mount assembly. This format includes standardized carrier tape, cover tape, and reel quantities-distinct from bulk or ammo-pack options-and is explicitly referenced in the Mechanical and Packaging section on page 2.
What is the maximum continuous Zener current for the 1N4462US/TR?
The maximum continuous Zener current (IZM) for the 1N4462US/TR is 191 mA, derived from its 1.5 W power rating and 7.5 V nominal Zener voltage (PD/VZ ≈ 200 mA, derated per thermal limits). The datasheet specifies 191 mA in the Electrical Characteristics table, reflecting safe operation at TA = 25 °C with proper end-cap thermal path.
Does the 1N4462US/TR require heatsinking in typical applications?
The 1N4462US/TR has a junction-to-end-cap thermal resistance of 20 °C/W and is designed to transfer heat directly through its tungsten slugs to a metalized PCB pad or heatsink. While not requiring external heatsinks at full 1.5 W in controlled environments, thermal design must account for board copper area and ambient temperature; derating is required above 25 °C per Figure 2's power-temperature curve.
1N4462US/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, A
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 7.5 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 2.5 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 4.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 1 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D-5A
1N4462US/TR FAQ
1.How can I place an order for 1N4462US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4462US/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 1N4462US/TR reliable?
The price and inventory of 1N4462US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4462US/TR is usually 5 days.
3.What payment methods are accepted for 1N4462US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4462US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4462US/TR?
1N4462US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4462US/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 1N4462US/TR?
For technical support, including 1N4462US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4462US/TR requirements.
6.How does Aetrix verify that 1N4462US/TR is sourced from the original manufacturer or authorized distributors?
All 1N4462US/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 1N4462US/TR meets industry standards.
7.What is the process for return or replacement of 1N4462US/TR?
All 1N4462US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4462US/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 1N4462US/TR part is unused and in its original packaging.
Return procedure for 1N4462US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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