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Microchip Technology 1N6632US/TR
- Part No.:
- 1N6632US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
1N6632US/TR.pdf
- Description:
- DIODE ZENER 3.3V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:89
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Product details
Overview
1N6632US/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 3.3 V ±5%, dynamic impedance of 3.0 Ω at 380 mA test current, and operating junction temperature range of −65 °C to +175 °C. It serves as a precision voltage reference and regulation element in high-reliability military and aerospace power conditioning circuits.
For engineers reviewing the 1N6632US/TR datasheet, 1N6632US/TR pinout, 1N6632US/TR application, or 1N6632US/TR equivalent, this part is selected for demanding DC voltage stabilization where hermetic sealing, radiation hardness, ESD insensitivity, and MIL-PRF-19500/356 qualification are mandatory design requirements.
Technical Context
This device operates in reverse breakdown mode with a specified Zener voltage of 3.3 V at IZT = 380 mA, exhibiting low dynamic impedance (3.0 Ω) and tight regulation (ΔVZ ≤ 0.90 V between 10% and 50% of IZM). Its Category III internal metallurgical bond ensures mechanical robustness under thermal cycling and shock.
The 1N6632US/TR uses a voidless hard-glass package with tungsten slugs and copper end caps finished with Sn/Pb, enabling stable thermal resistance of 10 °C/W (junction-to-end-cap) and surge current handling up to 20.0 A (8.3 ms square wave). It is polarity-marked with a cathode band and supplied in EIA-481-B tape-and-reel format.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 3.3 V ±5% at IZT = 380 mA - defines stable regulation point for low-voltage biasing and reference generation |
| Power Dissipation | 5 W @ TEC = 125 °C - supports continuous operation in high-temperature avionics and downhole electronics |
| Dynamic Impedance ZZ | 3.0 Ω @ IZT - ensures minimal output voltage variation under load transients |
| Junction Temperature Range | −65 °C to +175 °C - enables deployment in extreme-environment systems without derating penalties |
| Thermal Resistance θJC | 10 °C/W (junction-to-end-cap) - determines heatsinking requirements for sustained 5 W operation |
| Surge Current IZSM | 20.0 A (8.3 ms square wave) - withstands transient overvoltage events in power supply protection circuits |
| Reverse Leakage IR | 300 μA @ VR = 0.90 V - confirms low standby power loss in always-on reference designs |
Pinout & Package
Package: Hermetically sealed voidless hard-glass case with tungsten slugs and copper end caps (Sn/Pb finish); identified as "E" or "D-5B" outline per Microsemi SD44A.pdf. Cathode indicated by band on glass body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown return path | Connected to system ground or lower-potential rail; forms current return during Zener regulation |
| Cathode | Zener breakdown terminal / Regulated output node | Provides stable 3.3 V reference when biased above VZ; marked with visible band on glass body |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass construction | Eliminates moisture ingress and internal delamination risks in long-life space and defense systems |
| Category III metallurgical bond | Guarantees mechanical integrity under MIL-STD-883 vibration and thermal shock testing |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling and assembly without special static control beyond standard Class 1A protocols |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 for total ionizing dose (TID) tolerance in satellite electronics |
| MIL-PRF-19500/356 qualified | Meets screening, testing, and traceability requirements for JAN, JANTX, JANTXV, and JANS grades |
Applications
| Aerospace Power Bus Regulation | Defense System Reference Voltage |
|---|---|
Use Scenario: Stabilizing 3.3 V supply rails in satellite command & data handling (C&DH) modules exposed to wide thermal swings and radiation. IC Role / Device Role / Timing Role: Primary Zener shunt regulator providing low-drift voltage reference for ADCs and LDO feedback networks. Use Value: Maintains regulation accuracy within ±5% across −65 °C to +175 °C without external compensation, reducing BOM count and calibration overhead. |
Use Scenario: Generating trusted reference voltage for missile guidance sensor signal conditioning in hardened ground vehicles. IC Role / Device Role / Timing Role: High-reliability voltage clamp protecting analog front-end inputs against ESD and load dump transients. Use Value: Withstands 20.0 A surge current and exhibits <300 μA leakage at 0.9 V, ensuring fail-safe operation during electromagnetic threats. |
| Nuclear Instrumentation Bias Supply | Downhole Oil & Gas Sensor Conditioning |
Use Scenario: Providing stable bias for radiation detector photomultiplier tube (PMT) anode chains in reactor monitoring systems. IC Role / Device Role / Timing Role: Precision Zener reference establishing calibrated gain scaling in high-voltage analog chains. Use Value: Category III bond and voidless glass ensure zero parametric drift after 105 rads (Si) exposure, eliminating recalibration cycles. |
Use Scenario: Regulating auxiliary 3.3 V supplies for MEMS pressure/temperature sensors in geothermal drill string telemetry. IC Role / Device Role / Timing Role: Hermetically sealed shunt regulator maintaining reference integrity at 175 °C ambient wellhead temperatures. Use Value: 10 °C/W thermal resistance allows direct mounting to stainless steel housings, avoiding discrete heatsinks in confined borehole assemblies. |
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 (no /TR suffix) | Identical electrical specs and package; differs only in packaging format (bulk vs. tape-and-reel) | No functional difference; /TR denotes EIA-481-B compliant tape-and-reel for automated SMT placement | Select 1N6632US/TR when using pick-and-place equipment; choose bulk 1N6632US for manual prototyping or low-volume hand-soldering |
| 1N4954US | Same 5 W rating but higher VZ = 3.3 V, different thermal resistance (7 °C/W), and Category I bond instead of Category III | Designed for less severe mechanical stress environments; not qualified for JANS-grade radiation-hardened use | 1N4954US offers lower thermal resistance but lacks Category III bond and radiation hardness documentation required for spaceflight |
Compared with 1N6632US/TR, the 1N4954US provides better thermal performance but sacrifices mechanical ruggedness and radiation assurance; the non-/TR variant shares identical die and construction but requires manual handling-making 1N6632US/TR optimal for high-integrity automated production of mission-critical hardware.
Availability
1N6632US/TR is available at Aetrix Electronics and suitable for aerospace power bus regulation, defense system reference voltage generation, nuclear instrumentation bias supply, and downhole oil & gas sensor conditioning requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N6632US/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 company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N6632US/TR belongs to Microsemi's military-qualified Zener regulator family designed specifically for MIL-PRF-19500/356-compliant voltage reference and shunt regulation in extreme-environment electronics.
FAQ
What is the Zener voltage tolerance of the 1N6632US/TR?
The 1N6632US/TR has a nominal Zener voltage of 3.3 V with a standard tolerance of ±5%, as confirmed in the Electrical Characteristics table of Microsemi SD44A.pdf. No suffix indicates this standard tolerance; tighter tolerances (e.g., ±2% or ±1%) require C or D suffixes not present in this part number.
Does the 1N6632US/TR meet MIL-PRF-19500/356 requirements?
Yes, the 1N6632US/TR is explicitly qualified to MIL-PRF-19500/356 and supports JAN, JANTX, JANTXV, and JANS screening levels. Its Category III metallurgical bond, voidless glass construction, and full environmental test data per the specification are documented in the official Microsemi datasheet SD44A.pdf.
What is the maximum continuous Zener current for the 1N6632US/TR?
The maximum continuous Zener current (IZM) for the 1N6632US/TR is 1440 mA, derived from its 5 W power rating and 3.3 V nominal Zener voltage (P = V × I). This value is listed in the Electrical Characteristics table and assumes operation at TEC = 125 °C with appropriate thermal management.
Is the 1N6632US/TR radiation-hardened?
Yes, the 1N6632US/TR is inherently radiation-hardened as described in Microsemi MicroNote 050. Its voidless hermetic glass package and Category III bond provide proven tolerance to total ionizing dose (TID), making it suitable for satellite and nuclear instrumentation applications without additional shielding or derating.
What does the "/TR" suffix indicate in 1N6632US/TR?
The "/TR" suffix in 1N6632US/TR denotes EIA-481-B compliant tape-and-reel packaging optimized for automated surface-mount assembly. The underlying semiconductor die, electrical specifications, and hermetic glass package are identical to the bulk 1N6632US; only the packaging format differs.
1N6632US/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):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 3 Ohms
- Current - Reverse Leakage @ Vr:
- 300 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
1N6632US/TR FAQ
1.How can I place an order for 1N6632US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6632US/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 1N6632US/TR reliable?
The price and inventory of 1N6632US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6632US/TR is usually 5 days.
3.What payment methods are accepted for 1N6632US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6632US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6632US/TR?
1N6632US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6632US/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 1N6632US/TR?
For technical support, including 1N6632US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6632US/TR requirements.
6.How does Aetrix verify that 1N6632US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6632US/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 1N6632US/TR meets industry standards.
7.What is the process for return or replacement of 1N6632US/TR?
All 1N6632US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6632US/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 1N6632US/TR part is unused and in its original packaging.
Return procedure for 1N6632US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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