My Inquiry
My Account
Microchip Technology 1N485
- Part No.:
- 1N485
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N485.pdf
- Description:
- DIODE GEN PURP 180V 100MA DO7
- Quantity:
- Payment:
- Shipping:
Inventory:9,200
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N485 from Microsemi is a hermetically sealed glass-packaged switching diode with 180 V DC reverse voltage rating, 200 mA maximum operating current at 25°C, and 500 mW total power dissipation. It features metallurgical bonding, double plug construction, and operates across -65°C to +175°C for high-reliability aerospace and military timing and signal routing applications.
For engineers reviewing the 1N485 datasheet, 1N485 pinout, 1N485 application, or 1N485 equivalent, key selection factors include its MIL-PRF-19500/118 DO-7 hermetic package, 70°C/W thermal impedance, 2A 8.3ms surge capability, and strict temperature derating behavior above 25°C and 150°C.
Technical Context
The 1N485 is a silicon switching diode optimized for fast recovery and stable operation in harsh environments. Its metallurgically bonded junction and hermetic DO-7 glass package ensure low leakage (≤0.025 µA at 180 V, 25°C) and robustness against thermal cycling and humidity.
It exhibits forward voltage of 0.8–1.0 V at 100 mA and 25°C, with reverse leakage rising to ≤5.0 µA at 180 V and 150°C. Derating follows two linear segments: 1.2 mA/°C from 25°C to 150°C, then 1.0 mA/°C beyond 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DC Reverse Voltage (VRWM) | 180 V - Maximum continuous blocking voltage before significant leakage or breakdown |
| Max Operating Current (25°C) | 200 mA - Continuous forward current limit at ambient 25°C before thermal derating applies |
| Total Power Dissipation (25°C) | 500 mW - Maximum steady-state power handling at case temperature 25°C |
| Thermal Impedance (ZθJX) | 70°C/W - Junction-to-ambient thermal resistance under specified mounting conditions |
| Surge Current (8.3 ms sine) | 2 A - Peak non-repetitive forward surge current the device can withstand without failure |
| Operating Temperature Range | -65°C to +175°C - Full functional range per MIL-PRF-19500/118, validated for extended life in extreme environments |
Pinout & Package
Hermetically sealed glass DO-7 package per MIL-PRF-19500/118, with copper-clad steel leads and tin/lead finish. Cathode identified by blue body coat with black digits and a visible band at the cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to P-type region; must be at higher potential than cathode for conduction |
| Cathode | Forward current exit point | Banded end; connected to N-type region; referenced as circuit ground or return in clamp/signal routing |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic DO-7 glass package | Prevents moisture ingress and long-term parameter drift; required for MIL-PRF-19500/118 qualification |
| Metallurgical junction bond | Enables reliable high-temperature operation up to +175°C without interfacial degradation |
| Double plug construction | Improves mechanical stability and thermal path integrity between die and leads |
| Low reverse leakage | ≤0.025 µA at 180 V, 25°C - critical for precision clamping and hold-off circuits |
Applications
| Aerospace Power Sequencing | Military Radar Pulse Clamping |
|---|---|
Use Scenario: Controlling power-up order of avionics subsystems using discrete diode-based OR-ing and isolation networks. IC Role / Device Role / Timing Role: Switching diode providing unidirectional current flow and transient isolation between rail domains. Use Value: Stable 180 V reverse blocking and 200 mA current handling enable reliable sequencing across -65°C to +175°C operational envelope. |
Use Scenario: Protecting receiver front-end components from high-voltage radar transmit pulses via fast clamping. IC Role / Device Role / Timing Role: Fast-switching clamp diode shunting transient energy to ground during pulse transmission. Use Value: Low 0.8–1.0 V forward drop ensures rapid turn-on, while hermetic DO-7 package prevents performance degradation in humid, high-vibration radar bays. |
| Satellite Command Decoding | High-Temp Industrial Sensor Interface |
Use Scenario: Signal-level translation and polarity conditioning in command decoder logic chains on LEO satellites. IC Role / Device Role / Timing Role: Discrete switching diode used in wired-OR logic and level-shifting networks. Use Value: Metallurgically bonded junction maintains consistent VF and IR over 15+ year mission lifetimes under radiation and thermal cycling. |
Use Scenario: Isolating analog sensor outputs in downhole oil/gas instrumentation exposed to >150°C ambient. IC Role / Device Role / Timing Role: Reverse-biased protection diode preventing backfeed into sensor excitation circuits. Use Value: Validated operation at 150°C with 50 mA rated current and 1.0 mA/°C derating enables use without active cooling in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N485A | Same DO-7 package and electrical specs; differs only in screening level (JAN vs JANTX per MIL-PRF-19500/118) | Approved for higher-reliability programs requiring JANTX screening (e.g., flight-critical subsystems) | Select 1N485A when JANTX-level test documentation and lot traceability are contractually mandated |
| 1N485B | Identical electrical and thermal specs; qualified to JANTXV level with additional burn-in and parametric testing | Required for space-grade applications where enhanced radiation tolerance and zero-defect screening are enforced | Choose 1N485B when mission assurance requirements exceed JANTX, such as NASA Class S or ESA ESCC 4001 |
Compared with 1N485, the 1N485A and 1N485B offer identical electrical performance and packaging but differ in reliability screening depth-JAN (baseline), JANTX (enhanced), and JANTXV (most rigorous)-enabling tiered qualification without circuit redesign.
Availability
1N485 is available at Aetrix Electronics and suitable for aerospace power sequencing, military radar pulse clamping, satellite command decoding, and high-temp industrial sensor interface applications requiring stable component supply across extended temperature ranges and long lifecycle support.
Supply support for 1N485 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 ICs and discrete devices for defense, aerospace, and industrial markets.
The 1N485 belongs to Microsemi's legacy MIL-PRF-19500/118 qualified discrete diode family, designed specifically for mission-critical switching, clamping, and isolation in extreme-environment electronics.
FAQ
What is the maximum reverse voltage rating for the 1N485?
The 1N485 has a DC reverse voltage (VRWM) rating of 180 V, meaning it can reliably block up to 180 V in the reverse-biased direction at 25°C without exceeding specified leakage limits. This rating remains valid across its full operating temperature range of -65°C to +175°C, though reverse leakage increases with temperature-up to 5.0 µA at 180 V and 150°C.
Does the 1N485 have a defined pinout or terminal configuration?
Yes-the 1N485 uses a two-terminal DO-7 glass package with anode and cathode terminals. The cathode is marked by a visible band on the blue-coated glass body and black digit marking. Polarity is fixed: current flows from anode to cathode when forward biased, and the banded end must connect to the lower-potential node in circuit design.
How does thermal derating work for the 1N485 above 25°C?
The 1N485 applies dual-stage thermal derating: from 25°C to 150°C, maximum operating current decreases by 1.2 mA per °C rise; above 150°C, the rate changes to 1.0 mA per °C. At 150°C, rated current drops to 50 mA. This behavior is defined in the manufacturer's DC electrical characteristics table and must be applied in thermal design margins.
Is the 1N485 suitable for high-reliability aerospace applications?
Yes-the 1N485 is manufactured per MIL-PRF-19500/118 and qualified as a JAN-level device, with hermetic DO-7 packaging, metallurgical bonding, and full -65°C to +175°C operation. It supports aerospace applications where long-term stability, radiation tolerance, and proven field history are required, including avionics power control and telemetry signal conditioning.
What is the forward voltage drop of the 1N485 at typical operating conditions?
The 1N485 exhibits a forward voltage (VF) of 0.8 V minimum and 1.0 V maximum at 100 mA and 25°C. At lower currents (e.g., 10 mA), VF drops further, while at elevated temperatures (e.g., 150°C), VF decreases slightly due to semiconductor physics. These values are measured under controlled DC conditions and define conduction loss in switching and clamping paths.
1N485 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 180 V
- Current - Average Rectified (Io):
- 100mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 100 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 25 nA @ 180 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-7
- Operating Temperature - Junction:
- -65°C ~ 175°C
1N485 FAQ
1.How can I place an order for 1N485 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N485 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 1N485 reliable?
The price and inventory of 1N485 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N485 is usually 5 days.
3.What payment methods are accepted for 1N485?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N485 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N485?
1N485 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N485 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 1N485?
For technical support, including 1N485 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N485 requirements.
6.How does Aetrix verify that 1N485 is sourced from the original manufacturer or authorized distributors?
All 1N485 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 1N485 meets industry standards.
7.What is the process for return or replacement of 1N485?
All 1N485 units undergo pre-shipment inspection (PSI). If there is an issue with 1N485, 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 1N485 part is unused and in its original packaging.
Return procedure for 1N485:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N485 Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
