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Microchip Technology 1N484B
- Part No.:
- 1N484B
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N484B.pdf
- Description:
- DIODE GEN PURP 125V 200MA DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,867
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Product details
Overview
1N484B from Central Semiconductor is a DO-35 glass-encapsulated silicon rectifier diode rated for 125 V peak inverse voltage, 0.2 A average rectified current, and 1.0 V forward voltage drop at 0.1 A, operating across -65°C to +200°C junction temperature - used in high-temperature power supply rectification and signal steering.
For engineers reviewing the 1N484B datasheet, 1N484B pinout, 1N484B application, or 1N484B equivalent, key selection factors include its 125 V PIV rating, 200°C max junction temperature, DO-35 glass package with Sigma Bond™ plated leads, 250 mW power dissipation, and compatibility with high-temp IR reflow on ceramic substrates.
Technical Context
The 1N484B is a general-purpose axial-lead silicon rectifier optimized for high-temperature reliability: its DO-35 glass package provides hermetic sealing and thermal stability, while the thermally matched system eliminates fatigue under thermal cycling between -65°C and +200°C.
It delivers 0.2 A average forward current with only 1.0 V VF at 0.1 A, exhibits ≤0.025 µA leakage at 25°C and ≤5 µA at 150°C, and supports non-repetitive surge currents up to 2.0 A (8.3 ms half-sine), making it suitable for transient-tolerant industrial and aerospace power conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Inverse Voltage (PIV) | 125 V - maximum reverse voltage before breakdown; defines safe blocking capability in AC-to-DC rectifiers. |
| Average Forward Current (IO) | 0.2 A - continuous DC current handling at 25°C ambient; derating not required up to 200°C junction. |
| Forward Voltage Drop (VF) | 1.0 V @ 0.1 A - low conduction loss enabling efficient low-power rectification and clamping. |
| Junction Temperature Range | -65°C to +200°C - enables operation in extreme environments including downhole, engine bay, and military avionics. |
| Max Power Dissipation | 250 mW - sets thermal limit for PCB trace design and heatsinking requirements in compact layouts. |
| Leakage Current (IR) | ≤0.025 µA @ 25°C - ensures minimal reverse-bias power loss in precision biasing and sample-hold circuits. |
Pinout & Package
DO-35 glass axial package: cylindrical body (1.0 mm diameter × 3.05–5.08 mm length), tin-plated copper leads (0.458–0.558 mm diameter), hermetically sealed with humidity-proof construction and Sigma Bond™ plating for 100% solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward current entry point | Connected to positive side of AC source or load return in half-wave rectifier configurations. |
| Cathode (K) | Forward current exit point | Marked by band; ties to ground or negative rail; defines polarity-sensitive placement in clipping/steering networks. |
Key Features
| Feature | Design Value |
|---|---|
| Humidity-proof glass encapsulation | Prevents moisture ingress and corrosion in humid or condensing environments without conformal coating. |
| Sigma Bond™ plated contacts | Ensures reliable solder wetting and joint integrity during automated reflow, even after extended storage. |
| Thermally matched system | Eliminates internal stress during thermal cycling, preventing hermetic seal failure from coefficient mismatch. |
| Operation up to 200°C junction | Enables direct mounting on high-temp substrates (e.g., ceramic PCBs) without derating or external heatsinks. |
Applications
| High-Temperature Power Supply Rectification | Signal Clipping & Limiting |
|---|---|
Use Scenario: Converting 12–24 VAC transformer output to DC in engine control units exposed to under-hood temperatures exceeding 150°C. IC Role / Device Role / Timing Role: Rectifier diode conducting during positive half-cycles while blocking reverse voltage. Use Value: Maintains stable 125 V PIV margin and ≤1.0 V VF at elevated temperature, avoiding thermal runaway or leakage-induced ripple. | Use Scenario: Protecting ADC input pins from overvoltage transients in industrial sensor interfaces. IC Role / Device Role / Timing Role: Clamp diode limiting input swing to ±0.7 V relative to rails using forward conduction. Use Value: Low 0.025 µA leakage at 25°C preserves signal integrity; 200°C rating allows co-location with hot sensors. |
| Harsh-Environment Signal Steering | Ceramic-Board High-Reliability Rectification |
Use Scenario: Routing analog signals between isolated domains in oil & gas downhole telemetry modules. IC Role / Device Role / Timing Role: Steering diode directing current flow directionally while blocking reverse paths. Use Value: Hermetic DO-35 glass package withstands high-pressure, high-humidity, and chemical exposure without degradation. | Use Scenario: Full-wave rectification stage on alumina ceramic PCBs in military-grade power converters. IC Role / Device Role / Timing Role: Primary rectifier handling 0.2 A DC output with no derating up to 200°C junction. Use Value: Compatible with IR reflow profiles for ceramic substrates; Sigma Bond™ plating ensures void-free solder joints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N484 | Same PIV (125 V), IO (0.2 A), VF (1.0 V), but lacks Sigma Bond™ plating and 200°C-rated packaging. | Not qualified for >150°C operation or high-humidity assembly; limited to commercial-grade power supplies. | Select 1N484B when hermeticity, 200°C capability, or automated solderability are required. |
| LL4148 | Lower PIV (100 V), higher VF (1.0 V @ 10 mA), smaller LL-34 package; faster recovery (~4 ns) but lower surge rating (0.5 A). | Optimized for high-speed switching, not power rectification; unsuitable for 0.2 A continuous loads or 125 V blocking. | Choose LL4148 only for low-current, high-frequency signal routing - not as a functional replacement for 1N484B. |
Compared with 1N484 and LL4148, the 1N484B uniquely combines 125 V PIV, 0.2 A IO, 200°C operation, and hermetic DO-35 packaging - making it irreplaceable in high-reliability, high-temperature rectification where leakage, surge tolerance, and long-term seal integrity are critical.
Availability
1N484B is available at Aetrix Electronics and suitable for high-temperature power supply rectification, harsh-environment signal steering, and ceramic-board-based military power conversion requiring stable component supply across extended temperature and lifecycle windows.
Supply support for 1N484B 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
Central Semiconductor Corp. is a U.S.-based manufacturer specializing in discrete semiconductors, with emphasis on high-reliability, high-temperature, and hermetically sealed devices for industrial and aerospace markets.
The 1N484B belongs to Central's DO-35 glass rectifier family designed specifically for applications demanding extended temperature operation, moisture resistance, and robust automated assembly performance.
FAQ
What is the maximum junction temperature rating for the 1N484B?
The 1N484B has a specified junction temperature range of -65°C to +200°C. This rating is validated per Central Semiconductor's datasheet and enables operation in extreme environments such as engine compartments, downhole tools, and military avionics without derating. The 1N484B maintains its 125 V PIV and 0.2 A IO specifications across this full range.
Does the 1N484B have a hermetic package?
Yes, the 1N484B uses a DO-35 glass axial package that is hermetically sealed. Its humidity-proof glass construction prevents moisture ingress and corrosion, supporting long-term reliability in high-humidity, high-pressure, or chemically aggressive environments without conformal coating. This hermeticity is integral to the 1N484B's qualification for harsh applications.
What is the forward voltage drop of the 1N484B at 0.1 A?
The 1N484B exhibits a maximum forward voltage drop of 1.0 V at 0.1 A and 25°C, as confirmed in Central Semiconductor's published characteristics table. This value remains stable across temperature, contributing to predictable power loss in rectifier and clamping designs where the 1N484B is deployed.
Can the 1N484B be used with lead-free reflow soldering on ceramic PCBs?
Yes, the 1N484B is compatible with lead-free IR reflow processes on ceramic substrates. Its Sigma Bond™ plated leads ensure 100% guaranteed solderability, and its 200°C junction rating supports standard high-temp reflow profiles. The 1N484B is explicitly recommended for use on ceramic boards alongside high-temperature soldering in Central Semiconductor's application notes.
How does the 1N484B compare to the 1N483B in terms of peak inverse voltage?
The 1N484B has a peak inverse voltage (PIV) rating of 125 V, whereas the 1N483B is rated for 60 V. This 65 V increase makes the 1N484B suitable for higher-voltage AC line rectification and transient-blocking applications where the 1N483B would experience breakdown. Both share identical forward characteristics and thermal ratings, but PIV is the key differentiator between these adjacent family members.
1N484B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 125 V
- Current - Average Rectified (Io):
- 200mA
- 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 @ 125 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
- Operating Temperature - Junction:
- -65°C ~ 200°C
1N484B FAQ
1.How can I place an order for 1N484B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N484B 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 1N484B reliable?
The price and inventory of 1N484B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N484B is usually 5 days.
3.What payment methods are accepted for 1N484B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N484B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N484B?
1N484B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N484B 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 1N484B?
For technical support, including 1N484B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N484B requirements.
6.How does Aetrix verify that 1N484B is sourced from the original manufacturer or authorized distributors?
All 1N484B 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 1N484B meets industry standards.
7.What is the process for return or replacement of 1N484B?
All 1N484B units undergo pre-shipment inspection (PSI). If there is an issue with 1N484B, 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 1N484B part is unused and in its original packaging.
Return procedure for 1N484B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N484B 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
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