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Microchip Technology 1N6636US/TR
- Part No.:
- 1N6636US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
1N6636US/TR.pdf
- Description:
- DIODE ZENER 4.7V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
1N6636US/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 4.7 V ±5%, dynamic impedance of 2.0 Ω at 260 mA test current, and reverse leakage ≤0.60 V at 20 μA - used in precision voltage regulation for high-reliability military and aerospace power supply rails.
For engineers reviewing the 1N6636US/TR datasheet, 1N6636US/TR pinout, 1N6636US/TR application, or 1N6636US/TR equivalent, key selection criteria include its MIL-PRF-19500/356 qualification, Category III metallurgical bond, -65°C to +175°C operating temperature range, and hermetic glass package with tungsten slugs - critical for radiation-hardened and extended-temperature designs.
Technical Context
This device operates as a two-terminal voltage reference in reverse breakdown mode, delivering stable regulation across 10–50% of IZM (1010 mA), with voltage regulation ΔVZ ≤0.60 V over that range. Its thermal resistance is 10°C/W junction-to-end-cap, and it sustains 15.3 A non-repetitive surge current at 8.3 ms.
The 1N6636US/TR uses triple-layer passivation and exhibits ESD immunity per MIL-STD-750 Method 1020. Its temperature coefficient is ±0.025%/°C at IZT, enabling predictable drift behavior in wide-temperature environments without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.7 V ±5% at 260 mA - defines regulated output level for low-voltage reference circuits |
| Power Dissipation | 5 W @ TEC = 125°C - sets maximum continuous thermal load before derating begins |
| Dynamic Impedance ZZ | 2.0 Ω @ IZT = 260 mA - determines output voltage stability under load transients |
| Reverse Leakage IR | 20 μA @ VR = 0.60 V - ensures minimal quiescent current in standby regulation |
| Surge Current IZSM | 15.3 A @ 8.3 ms - supports transient overvoltage clamping in protection circuits |
| Operating Temperature | -65°C to +175°C - enables deployment in extreme-environment avionics and downhole tools |
| Thermal Resistance | 10°C/W junction-to-end-cap - informs heatsinking requirements for sustained 5 W operation |
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; "E" package (also known as "D-5B").
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in regulation path; forward voltage ≤1.50 V @ 1.0 A |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher-potential node; regulates voltage when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass construction | Eliminates internal delamination risk and moisture ingress - essential for >20-year field life in sealed systems |
| Category III metallurgical bond | Ensures mechanical integrity under thermal cycling and vibration stress in aerospace mounting |
| MIL-PRF-19500/356 qualification | Validates compliance with military screening, testing, and traceability requirements for Class H reliability |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling without special grounding protocols during board assembly and rework |
| Inherent radiation hardness | Per MicroNote 050 - suitable for low-dose-rate space applications without shielding overhead |
Applications
| Aerospace Power Conditioning | Military Avionics Reference |
|---|---|
|
Use Scenario: Regulating auxiliary 5 V rail in flight control computer power module exposed to -55°C to +125°C ambient. IC Role / Device Role / Timing Role: Two-terminal Zener reference providing stable bias for op-amps and ADC references. Use Value: Maintains <±1% output deviation across full temperature range due to ±0.025%/°C tempco and 2.0 Ω ZZ. |
Use Scenario: Voltage clamp in radar receiver front-end protection circuit subject to lightning-induced surges. IC Role / Device Role / Timing Role: Transient suppressor absorbing 15.3 A 8.3 ms surges while holding clamped voltage ≤5.3 V. Use Value: Survives repeated surge events without parameter shift thanks to voidless glass and Category III bond. |
| Satellite Onboard Instrumentation | Downhole Oilfield Sensor Module |
|
Use Scenario: Precision reference for gamma-ray spectrometer analog front-end operating in low-dose radiation environment. IC Role / Device Role / Timing Role: Radiation-hardened voltage reference replacing TCXO-based solutions where timing not required. Use Value: No parametric degradation after 10 krad(Si) exposure per MicroNote 050 - avoids recalibration cycles. |
Use Scenario: Overvoltage protection for pressure transducer signal conditioning in 175°C wellhead electronics. IC Role / Device Role / Timing Role: High-temperature-stable Zener shunt regulator maintaining 4.7 V reference at junction temperatures up to 175°C. Use Value: Operates continuously at 175°C with no derating loss - eliminates need for active cooling or thermal margining. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6636US (no TR suffix) | Identical electrical specs and package; differs only in packaging - bulk vs. tape-and-reel | No functional difference; TR version optimized for automated SMT placement | Select 1N6636US/TR for pick-and-place production; choose 1N6636US for manual prototyping or low-volume repair |
| 1N6635US/TR | 4.3 V nominal Zener voltage (vs. 4.7 V); same 5 W rating, 2.0 Ω ZZ, and -65°C to +175°C range | Used where 4.3 V regulation is required instead of 4.7 V - e.g., legacy interface voltage matching | Choose 1N6635US/TR only when system-level voltage tolerance requires 4.3 V; otherwise retain 1N6636US/TR for 4.7 V compliance |
Compared with 1N6636US/TR, the 1N6636US offers identical performance in bulk form but lacks tape-and-reel logistics support, while 1N6635US/TR shifts regulation to 4.3 V - requiring schematic and layout verification if substituted.
Availability
1N6636US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, military avionics reference, and downhole oilfield sensor modules requiring stable component supply with full MIL-PRF-19500 traceability and extended-temperature assurance.
Supply support for 1N6636US/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 defense, aerospace, and industrial markets.
The 1N6636US/TR belongs to Microsemi's military-qualified Zener series designed specifically for failure-intolerant voltage regulation in harsh-environment systems where hermeticity, radiation tolerance, and extended temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance for 1N6636US/TR?
The 1N6636US/TR has a nominal Zener voltage of 4.7 V with a standard tolerance of ±5%, as specified in the SD44A datasheet. 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 260 mA test current and 25°C ambient.
Does 1N6636US/TR meet MIL-PRF-19500/356 requirements?
Yes, the 1N6636US/TR is qualified to MIL-PRF-19500/356 as a JAN, JANTX, JANTXV, or JANS device depending on screening level - confirmed in the official SD44A datasheet. It undergoes rigorous environmental, electrical, and mechanical testing including thermal shock, vibration, and hermeticity validation per the specification.
What is the maximum continuous Zener current for 1N6636US/TR?
The maximum continuous Zener current (IZM) for 1N6636US/TR is 1010 mA at TEC = 125°C, derived from its 5 W power rating and 4.7 V nominal Zener voltage. Current must be derated linearly above 125°C ambient case temperature, reaching zero at 175°C junction temperature.
Is 1N6636US/TR suitable for surface-mount assembly?
Yes, the 1N6636US/TR uses the "E" package (also designated "D-5B"), a surface-mount hermetic glass outline with end-cap terminations. It is compatible with standard reflow profiles and supports tape-and-reel feeding (TR suffix denotes EIA-481-B compliance), making it fully suitable for automated SMT production.
What is the thermal resistance of 1N6636US/TR?
The thermal resistance (RθJC) of 1N6636US/TR is 10°C/W junction-to-end-cap, as documented in the SD44A datasheet. This value applies specifically to the 1N6632US–1N6637US family and reflects the thermal path through tungsten slugs and copper end caps - critical for calculating junction temperature rise under load.
1N6636US/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):
- 4.7 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 20 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
1N6636US/TR FAQ
1.How can I place an order for 1N6636US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6636US/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 1N6636US/TR reliable?
The price and inventory of 1N6636US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6636US/TR is usually 5 days.
3.What payment methods are accepted for 1N6636US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6636US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6636US/TR?
1N6636US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6636US/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 1N6636US/TR?
For technical support, including 1N6636US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6636US/TR requirements.
6.How does Aetrix verify that 1N6636US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6636US/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 1N6636US/TR meets industry standards.
7.What is the process for return or replacement of 1N6636US/TR?
All 1N6636US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6636US/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 1N6636US/TR part is unused and in its original packaging.
Return procedure for 1N6636US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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