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Microchip Technology 1N4148UBCD
- Part No.:
- 1N4148UBCD
- Manufacturer:
- Microchip Technology
- Category:
- Diode Arrays
- Package:
- 3-SMD, No Lead
- Datasheet:
-
1N4148UBCD.pdf
- Description:
- DIODE ARRAY GEN PURP 75V 1A UBC
- Quantity:
- Payment:
- Shipping:
Inventory:9,202
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Product details
Overview
1N4148UBCD from Microsemi is a military-qualified surface-mount silicon switching diode in a ceramic UB package, featuring 75 V working peak reverse voltage, 200 mA average rectified current at 75 °C, 5 ns reverse recovery time, and 4.0 pF capacitance at 0 V - used in high-frequency RS-232/RS-422 interfaces and Ethernet 10 Base-T data lines.
For engineers reviewing the 1N4148UBCD datasheet, 1N4148UBCD pinout, 1N4148UBCD application, or 1N4148UBCD equivalent, this page delivers verified military-grade diode specifications, polarity options (including common anode), thermal resistance (120 °C/W junction-to-solder pad), RoHS compliance status, and direct alternatives for MIL-PRF-19500/116-compliant designs.
Technical Context
This diode implements a planar-diffused silicon PN junction optimized for fast unidirectional signal switching in harsh environments. Its ceramic UB package provides hermetic sealing and thermal stability across –65 °C to +200 °C junction temperature range, with gold-plated terminals ensuring reliable solderability and corrosion resistance.
Electrical behavior is defined by low forward voltage (0.8 V @ 10 mA), minimal reverse leakage (25 nA @ 20 V), and tightly controlled capacitance (4.0 pF @ 0 V, 2.8 pF @ 1.5 V), enabling stable performance in >10 MHz digital signal paths without parasitic loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage | 75 V - maximum continuous DC reverse bias before breakdown in operational temperature range |
| Reverse Recovery Time | 5 ns - enables clean switching in >10 MHz digital signal routing and interface circuits |
| Capacitance @ 0 V | 4.0 pF - minimizes signal distortion and crosstalk on high-speed data lines |
| Average Rectified Current | 200 mA @ TA = 75 °C - supports sustained signal-level clamping and protection in compact layouts |
| Junction Temperature Range | –65 °C to +200 °C - certified for extended operation in aerospace, defense, and downhole electronics |
| Thermal Resistance J-to-SP | 120 °C/W - allows direct thermal coupling to PCB copper for passive heat dissipation |
Pinout & Package
Ceramic surface-mount UB package (2-pin, non-polarized outline per Microsemi T4-LDS-0281-2); dimensions: 3.25 mm × 2.74 mm × 1.42 mm (L × W × H); gold-plated nickel terminals; marking includes part number, date code, and manufacturer ID.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pad 1 | Anode | Forward current entry point; connects to positive-side signal or supply rail in clamping/steering roles |
| Pad 2 | Cathode | Forward current exit point; ties to reference ground or return path in high-speed logic interfaces |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/116 qualification | JAN/JANTX/JANTXV levels confirmed - meets screening, testing, and traceability requirements for defense procurement |
| Ceramic hermetic construction | Eliminates moisture ingress and long-term parameter drift in humid or corrosive environments |
| Low capacitance (4.0 pF) | Preserves signal edge integrity in RS-422 differential pairs and Ethernet 10 Base-T PHY layers |
| Fast trr (5 ns) | Reduces switching loss and prevents false triggering in clocked data acquisition systems |
Applications
| RS-232 Interface Protection | Ethernet 10 Base-T Signal Clamping |
|---|---|
Use Scenario: Protecting UART transceivers against ESD and line transients in industrial serial gateways. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between TX/RX lines and local ground. Use Value: 5 ns trr ensures transient suppression without distorting 115.2 kbps asynchronous framing. | Use Scenario: Biasing and signal conditioning in 10 Mbps Ethernet PHY front-end circuits. IC Role / Device Role / Timing Role: Fast-switching steering diode in Manchester-encoded signal paths. Use Value: 4.0 pF capacitance avoids skew between differential pair legs in transformer-coupled links. |
| High-Frequency Data Line Steering | Aerospace Avionics Signal Isolation |
Use Scenario: Routing multiplexed sensor data from analog front-ends to ADC inputs in real-time control systems. IC Role / Device Role / Timing Role: Low-capacitance signal path selector in precision timing-sensitive measurement chains. Use Value: 0.8 V VF at 10 mA enables accurate level-shifting without adding propagation delay. | Use Scenario: Isolating discrete logic signals across power domain boundaries in flight control computers. IC Role / Device Role / Timing Role: MIL-qualified unidirectional isolation element in radiation-tolerant I/O buffers. Use Value: –65 °C to +200 °C operating range supports operation in sealed, conduction-cooled avionics enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4148UBC | Ceramic lid variant (UBC) with identical electrical specs but different mechanical sealing method | Preferred where lid-based hermeticity verification is required per MIL-STD-883 test methods | Select 1N4148UBC when lid seal integrity must be independently validated beyond standard UB qualification |
| 1N4148UB2 | Same die in 2-pin surface-mount UB2 package; identical trr, VF, and capacitance; slightly larger footprint (3.25 mm × 2.74 mm vs. 3.25 mm × 2.74 mm - same L/W, different terminal geometry) | Used in legacy board designs with wider pad spacing or automated optical inspection constraints | Choose 1N4148UB2 only if existing stencil or placement tooling requires UB2 land pattern compatibility |
Compared with 1N4148UBCD, the 1N4148UBC offers enhanced lid-seal verification for mission-critical hermeticity, while 1N4148UB2 maintains full electrical equivalence with minor mechanical layout adaptation - neither is pin-compatible due to distinct terminal configurations within the UB family.
Availability
1N4148UBCD is available at Aetrix Electronics and suitable for RS-232 interface protection, Ethernet 10 Base-T signal clamping, and aerospace avionics signal isolation requiring stable component supply under MIL-PRF-19500/116 compliance.
Supply support for 1N4148UBCD 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 Corporation (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 1N4148UBCD belongs to Microsemi's military-qualified switching diode product line, designed specifically to replace legacy axial-leaded 1N4148 in surface-mount, high-reliability systems demanding MIL-PRF-19500/116 conformance.
FAQ
What is the reverse recovery time specification for the 1N4148UBCD?
The 1N4148UBCD has a reverse recovery time (trr) of 5 ns under standard test conditions (IF = IR = 10 mA, RL = 100 Ω). This value is measured per Microsemi T4-LDS-0281-2 and confirms its suitability for high-speed digital signal routing up to 10 MHz. The 1N4148UBCD achieves this performance through optimized silicon doping and junction geometry, not external circuitry.
Is the 1N4148UBCD RoHS compliant?
Yes, the 1N4148UBCD is RoHS compliant by design per Microsemi documentation T4-LDS-0281-2 Rev. 1. It contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE) above threshold limits. Compliance applies to both the silicon die and the ceramic UB package materials.
What polarity options are available for the 1N4148UBCD?
The 1N4148UBCD is supplied as a unidirectional device (no suffix), but Microsemi's 1N4148UB family includes CA (common anode), CC (common cathode), and D (doubler) variants. The 1N4148UBCD itself is unidirectional - Pad 1 is anode, Pad 2 is cathode - and does not support internal dual-diode configurations.
Does the 1N4148UBCD meet MIL-PRF-19500/116 requirements?
Yes, the 1N4148UBCD is qualified to MIL-PRF-19500/116 at JAN, JANTX, and JANTXV reliability levels. This includes environmental stress screening, burn-in, and parametric testing per the specification. Qualification is documented in Microsemi's T4-LDS-0281-2 datasheet and supported by traceable lot-level certification.
What is the thermal resistance from junction to solder pad for the 1N4148UBCD?
The 1N4148UBCD has a thermal resistance of 120 °C/W from junction to solder pad (RӨJSP), as specified in the "Maximum Ratings" table of T4-LDS-0281-2. This value enables effective passive heat transfer to PCB copper planes and is critical for maintaining junction temperature below 200 °C during 200 mA operation at elevated ambient temperatures.
1N4148UBCD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 3-SMD, No Lead
- Packaging:
- Bulk
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Series Connection
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 75 V
- Current - Average Rectified (Io) (per Diode):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 800 mV @ 100 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 5 ns
- Current - Reverse Leakage @ Vr:
- 25 nA @ 20 V
- Operating Temperature - Junction:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- UBC
1N4148UBCD FAQ
1.How can I place an order for 1N4148UBCD through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4148UBCD 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 1N4148UBCD reliable?
The price and inventory of 1N4148UBCD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4148UBCD is usually 5 days.
3.What payment methods are accepted for 1N4148UBCD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4148UBCD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4148UBCD?
1N4148UBCD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4148UBCD 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 1N4148UBCD?
For technical support, including 1N4148UBCD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4148UBCD requirements.
6.How does Aetrix verify that 1N4148UBCD is sourced from the original manufacturer or authorized distributors?
All 1N4148UBCD 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 1N4148UBCD meets industry standards.
7.What is the process for return or replacement of 1N4148UBCD?
All 1N4148UBCD units undergo pre-shipment inspection (PSI). If there is an issue with 1N4148UBCD, 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 1N4148UBCD part is unused and in its original packaging.
Return procedure for 1N4148UBCD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4148UBCD Tags
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BAV99-7-F
Diodes Incorporated
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BAT54C-7-F
Diodes Incorporated
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BAV99,215
Nexperia USA Inc.
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BAT54SLT1G
onsemi
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BAV70LT1G
onsemi
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BAT54CLT1G
onsemi
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BAT54S-7-F
Diodes Incorporated
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BAV99LT1G
onsemi
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BAT54S,215
Nexperia USA Inc.
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BAS40-04LT1G
onsemi
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MMBD1503-TP
Micro Commercial Co
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BAV99WT1G
onsemi
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