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Microchip Technology 1N6633US/TR
- Part No.:
- 1N6633US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
1N6633US/TR.pdf
- Description:
- DIODE ZENER 3.6V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:80
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Product details
Overview
1N6633US/TR from Microsemi is a surface-mount, voidless hermetically sealed glass Zener diode rated for 5 W power dissipation at TEC = 125 °C, with nominal Zener voltage of 3.6 V ±5%, dynamic impedance of 2.5 Ω at 350 mA test current, and operating junction temperature range from –65 °C to +175 °C. It serves as a precision voltage reference or overvoltage clamp in high-reliability military and aerospace power regulation circuits.
For engineers reviewing the 1N6633US/TR datasheet, 1N6633US/TR pinout, 1N6633US/TR application, or 1N6633US/TR equivalent, key selection criteria include its Category III metallurgical bond, radiation-hardened construction per MicroNote 050, ESD immunity per MIL-STD-750 Method 1020, and thermal resistance of 10 °C/W junction-to-end-cap.
Technical Context
This device belongs to the 1N6632US–1N6637US family of military-qualified (MIL-PRF-19500/356) Zener regulators. Its voidless-glass hermetic seal and tungsten slug construction ensure long-term stability under extreme thermal cycling and radiation exposure. The internal Category III metallurgical bond provides enhanced mechanical integrity versus Category I devices in the same series.
Electrical behavior is defined by tight regulation across wide current ranges: VZ = 3.6 V at IZT = 350 mA, with ΔVZ ≤ 1.0 V between 10% and 50% of IZM, and low leakage (IR ≤ 250 μA at VR = 1.0 V). It exhibits negative temperature coefficient (αVZ = –0.070 %/°C), enabling predictable drift compensation in analog references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.6 V ±5% at 350 mA - defines stable regulation point for low-voltage reference design |
| Power Dissipation | 5 W @ TEC = 125 °C - supports high-current clamping without derating until 175 °C |
| Dynamic Impedance (ZZ) | 2.5 Ω at IZT = 350 mA - ensures minimal output voltage variation under load transients |
| Max Reverse Leakage | 250 μA at VR = 1.0 V - guarantees low standby power loss in always-on protection circuits |
| Junction Temp Range | –65 °C to +175 °C - enables operation in engine bay, downhole, or space-grade environments |
| Thermal Resistance | 10 °C/W junction-to-end-cap - allows direct thermal coupling to heatsink or PCB copper pour |
| Surge Current (8.3 ms) | 18.7 A - withstands repetitive lightning-induced transients per MIL-STD-461/464 |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs; end caps are copper with Sn/Pb finish; polarity indicated by cathode band; weight 539 mg; tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode | Zener breakdown terminal | Marked with band; connected to regulated voltage rail; carries full Zener current |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal delamination risk over 20+ year field life |
| Category III metallurgical bond | Provides superior mechanical strength and thermal cycle survivability vs. Category I bonds |
| Nonsensitive to ESD | Withstands >8 kV HBM per MIL-STD-750 Method 1020 without parameter shift |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 for total ionizing dose (TID) up to 100 krad(Si) |
| Triple-layer passivation | Prevents surface leakage paths and enhances long-term parameter stability in humid environments |
Applications
| Aerospace Power Bus Protection | Military Avionics Reference |
|---|---|
Use Scenario: Clamp transient spikes on 28 V DC aircraft bus during load dump or EMP events. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt excess energy to ground. Use Value: 18.7 A surge rating and –65 °C to +175 °C operation ensure reliability across flight envelope extremes. |
Use Scenario: Provide stable 3.6 V reference for analog-to-digital converters in inertial measurement units. IC Role / Device Role / Timing Role: Precision voltage reference with low dynamic impedance and predictable TC. Use Value: 2.5 Ω ZZ and –0.070 %/°C αVZ enable sub-0.1% reference drift over temperature. |
| Satellite Power Conditioning | Downhole Oilfield Electronics |
Use Scenario: Regulate auxiliary supply rails in radiation-intensive LEO satellite subsystems. IC Role / Device Role / Timing Role: Radiation-hardened Zener regulator maintaining voltage setpoint under proton bombardment. Use Value: Inherent TID hardness per MicroNote 050 eliminates need for shielding or redundancy overhead. |
Use Scenario: Protect sensor front-ends from voltage surges in high-temperature wellhead control modules. IC Role / Device Role / Timing Role: High-temp-stable clamping element in 175 °C-rated instrumentation circuitry. Use Value: Stable 3.6 V regulation and 10 °C/W thermal resistance enable direct mounting on ceramic substrates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6632US/TR | Zener voltage 3.3 V ±5%, 380 mA IZT, 3.0 Ω ZZ, –0.075 %/°C TC | Lower regulation voltage; tighter TC for ultra-low-voltage reference designs | Select when 3.3 V reference is required and tighter temperature tracking is critical |
| 1N6634US/TR | Zener voltage 3.9 V ±5%, 320 mA IZT, 2.0 Ω ZZ, –0.060 %/°C TC | Higher regulation voltage; lower dynamic impedance for improved transient response | Select when higher clamping threshold is needed and lowest possible ZZ is prioritized |
Compared with 1N6632US/TR and 1N6634US/TR, the 1N6633US/TR offers the optimal balance of mid-range Zener voltage (3.6 V), moderate dynamic impedance (2.5 Ω), and stable negative TC (–0.070 %/°C), making it preferred for general-purpose high-reliability 3.3–3.9 V reference and clamp applications where voltage headroom and thermal predictability are both critical.
Availability
1N6633US/TR is available at Aetrix Electronics and suitable for aerospace power bus protection, military avionics reference, and satellite power conditioning requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N6633US/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 (now part of Microchip Technology) is a U.S.-based semiconductor manufacturer specializing in high-reliability, radiation-hardened, and defense-grade analog and discrete components.
The 1N6633US/TR belongs to Microsemi's military-qualified Zener regulator product line, designed specifically for mission-critical voltage reference and overvoltage protection in aerospace, defense, and industrial systems demanding MIL-PRF-19500/356 compliance.
FAQ
What is the Zener voltage tolerance for 1N6633US/TR?
The 1N6633US/TR has a nominal Zener voltage of 3.6 V with a standard tolerance of ±5%, as specified in the electrical characteristics table. No suffix indicates this standard tolerance; tighter tolerances (e.g., ±2% or ±1%) require C or D suffixes not present in this part number. This tolerance applies at 25 °C and IZT = 350 mA.
Is 1N6633US/TR suitable for high-temperature operation?
Yes, the 1N6633US/TR is rated for continuous operation from –65 °C to +175 °C junction temperature, with 5 W power dissipation guaranteed at TEC = 125 °C and linear derating to zero at 175 °C. Its voidless-glass hermetic seal and tungsten slug construction ensure parametric stability under sustained thermal stress typical in downhole or engine-mounted electronics.
Does 1N6633US/TR meet military specifications?
Yes, the 1N6633US/TR is qualified to MIL-PRF-19500/356 and falls under the JAN, JANTX, JANTXV, and JANS classifications depending on screening level. It features Category III metallurgical bonding and triple-layer passivation, meeting requirements for high-reliability applications where failure is not tolerable, such as flight-critical avionics.
What is the thermal resistance of 1N6633US/TR?
The 1N6633US/TR has a thermal resistance of 10 °C/W junction-to-end-cap, as confirmed in the Maximum Ratings section. This value reflects its construction within the 1N6632US–1N6637US series and enables effective thermal management when mounted directly to a heatsink or thermally enhanced PCB pad, supporting full 5 W dissipation at elevated ambient temperatures.
How does radiation hardness apply to 1N6633US/TR?
The 1N6633US/TR exhibits inherent radiation hardness validated per Microsemi MicroNote 050, covering total ionizing dose (TID) effects up to 100 krad(Si). This performance stems from its voidless-glass hermetic seal and material composition-not added shielding-making it suitable for LEO satellite power regulation without additional rad-hard qualification testing.
1N6633US/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, E
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2.5 Ohms
- Current - Reverse Leakage @ Vr:
- 250 µA @ 1 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:
- E-MELF
1N6633US/TR FAQ
1.How can I place an order for 1N6633US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6633US/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 1N6633US/TR reliable?
The price and inventory of 1N6633US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6633US/TR is usually 5 days.
3.What payment methods are accepted for 1N6633US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6633US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6633US/TR?
1N6633US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6633US/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 1N6633US/TR?
For technical support, including 1N6633US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6633US/TR requirements.
6.How does Aetrix verify that 1N6633US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6633US/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 1N6633US/TR meets industry standards.
7.What is the process for return or replacement of 1N6633US/TR?
All 1N6633US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6633US/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 1N6633US/TR part is unused and in its original packaging.
Return procedure for 1N6633US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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