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Microchip Technology 1N4148UB/TR
- Part No.:
- 1N4148UB/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- 3-SMD, No Lead
- Datasheet:
-
1N4148UB/TR.pdf
- Description:
- DIODE GEN PURP 75V 200MA UB
- Quantity:
- Payment:
- Shipping:
Inventory:3,262
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Product details
Overview
1N4148UB/TR from Microsemi is a military-qualified surface-mount silicon switching diode in 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 interface networks and Ethernet 10 Base-T data lines.
For engineers reviewing the 1N4148UB/TR datasheet, 1N4148UB/TR pinout, 1N4148UB/TR application, or 1N4148UB/TR equivalent, key selection criteria include MIL-PRF-19500/116 qualification level (JAN/JANTX/JANTXV), low-profile ceramic packaging, unidirectional polarity, thermal resistance of 120 °C/W junction-to-solder pad, and RoHS-compliant construction.
Technical Context
This diode operates as a unidirectional signal-level switching device with fast transient response, optimized for high-speed digital and communication line protection. Its ceramic UB package enables stable operation from –65 °C to +200 °C junction temperature and supports reliable solder-pad thermal dissipation.
The 1N4148UB/TR exhibits 0.8 V forward voltage at 10 mA and 1.2 V at 100 mA, with reverse leakage limited to 25 nA at 20 V and 0.5 µA at 75 V (25 °C); capacitance drops from 4.0 pF (0 V) to 2.8 pF (1.5 V), supporting RF-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage | 75 V - maximum continuous reverse bias before breakdown in normal operation |
| Reverse Recovery Time | 5 ns - enables clean switching up to ~70 MHz in digital signal paths |
| Capacitance @ 0 V | 4.0 pF - minimizes signal loading on high-speed data lines like RS-422 |
| Avg. Rectified Current @ 75 °C | 200 mA - defines sustained forward conduction capability with derating above ambient |
| Junction Temperature Range | –65 to +200 °C - supports deployment in aerospace, defense, and industrial environments |
| Forward Voltage @ 10 mA | 0.8 V max - ensures low power loss in clamping and logic-level translation circuits |
Pinout & Package
Ceramic surface-mount UB package with two terminals: gold-plated nickel underplate leads, <0.04 g weight, and dimensions per Microsemi T4-LDS-0281-2 (BL: 2.92–3.25 mm, BW: 2.16–2.74 mm, BH: 1.17–1.42 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to higher-potential node during conduction; marked side indicates cathode |
| Cathode | Forward current exit point | Internally connected to metallized ceramic lid; serves as reference for polarity-sensitive clamping |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/116 qualification | JAN/JANTX/JANTXV levels confirmed - meets military screening, testing, and traceability requirements |
| Ceramic UB package | Hermetic, low-profile SMT construction - eliminates moisture ingress and supports reflow compatibility |
| 5 ns reverse recovery time | Enables use in >10 MHz clocked logic interfaces without tail current distortion |
| RoHS compliant by design | No lead, cadmium, mercury, hexavalent chromium, PBBs, or PBDEs - compliant with EU Directive 2011/65/EU |
Applications
| RS-232 Interface Protection | Ethernet 10 Base-T Line Clamping |
|---|---|
Use Scenario: Protecting UART transceivers against ESD and line transients in rugged serial communication links. IC Role / Device Role: Unidirectional clamping diode placed between data line and ground/VCC rail. Use Value: 5 ns trr and 75 V VRWM allow fast transient suppression without distorting 115.2 kbps signal edges. | Use Scenario: Signal integrity preservation on twisted-pair Ethernet PHY outputs. IC Role / Device Role: Low-capacitance steering diode in common-mode choke bypass networks. Use Value: 4.0 pF capacitance at 0 V avoids impedance mismatch and jitter in 10 Mbps differential signaling. |
| LAN Transceiver Input Protection | High-Frequency Data Line Snubbing |
Use Scenario: Guarding RJ-45 port PHY inputs against induced surges in industrial LAN nodes. IC Role / Device Role: Reverse-biased protection element shunting overvoltage to ground. Use Value: 200 °C max junction temperature and ceramic hermeticity ensure reliability in unventilated enclosures. | Use Scenario: Damping ringing on fast-switching digital control lines (e.g., SPI clock, reset). IC Role / Device Role: Passive snubber diode across inductive traces or connectors. Use Value: 0.8 V VF at 10 mA provides predictable turn-on threshold without excessive forward drop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4148W-7-F (Diodes Inc.) | Plastic SOD-123 package; 100 V V(BR); 4 ns trr; 4 pF C; commercial-grade only | Lacks MIL-PRF-19500/116 qualification and ceramic hermeticity | Select when cost-sensitive commercial designs prioritize speed over environmental robustness |
| NSR0230HT1G (ON Semiconductor) | Schottky architecture; 30 V VRWM; 0.3 V VF; no reverse recovery; 10 pF C | Lower VF but higher capacitance and reduced reverse voltage rating | Select for ultra-low-loss 3.3 V logic clamping where reverse blocking >30 V is not required |
Compared with 1N4148UB/TR, the 1N4148W-7-F offers faster trr but lacks military qualification and ceramic reliability, while the NSR0230HT1G eliminates reverse recovery entirely but sacrifices reverse voltage headroom and increases capacitive loading - making 1N4148UB/TR optimal for MIL-spec, high-VR, low-C signal routing.
Availability
1N4148UB/TR is available at Aetrix Electronics and suitable for RS-232 interface protection, Ethernet 10 Base-T line clamping, and high-frequency data line snubbing requiring stable component supply across extended temperature and lifecycle-critical programs.
Supply support for 1N4148UB/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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal ICs, discrete devices, and timing solutions for aerospace, defense, and industrial markets.
The 1N4148UB/TR belongs to Microsemi's military-qualified discrete diode product line, engineered specifically for signal integrity and environmental resilience in mission-critical communication and data interface systems.
FAQ
What is the qualified reliability level for the 1N4148UB/TR?
The 1N4148UB/TR is qualified per MIL-PRF-19500/116 at JAN, JANTX, and JANTXV levels - verified through rigorous screening including temperature cycling, burn-in, and lot acceptance testing. Each 1N4148UB/TR unit carries full traceability documentation and conforms to military-grade quality assurance protocols defined in the specification.
Does the 1N4148UB/TR have a specified forward voltage at 100 mA?
Yes, the 1N4148UB/TR has a maximum forward voltage of 1.2 V at 100 mA forward current and 25 °C, as confirmed in the Electrical Characteristics table on page 3 of Microsemi T4-LDS-0281-2. This value ensures predictable power dissipation in high-duty-cycle clamping applications and is validated across the full qualified temperature range.
Is the 1N4148UB/TR RoHS compliant?
Yes, the 1N4148UB/TR is RoHS compliant by design, containing no lead, cadmium, mercury, hexavalent chromium, PBBs, or PBDEs - fully aligned with EU Directive 2011/65/EU. Compliance is documented in Microsemi's material declarations and supported by manufacturing process controls verified during qualification.
What is the thermal resistance junction-to-solder pad for the 1N4148UB/TR?
The 1N4148UB/TR has a thermal resistance of 120 °C/W from junction to solder pad (RθJSP), measured under standard PCB mounting conditions per Figure 2 in T4-LDS-0281-2. This parameter enables accurate thermal modeling for high-density layouts where heat removal via solder pads is critical to maintaining the –65 to +200 °C junction operating range.
Can the 1N4148UB/TR be used in place of axial-leaded 1N4148-1 in SMT designs?
Yes, the 1N4148UB/TR is the surface-mount ceramic equivalent of the JEDEC-registered 1N4148, designed specifically to replace axial-leaded variants like 1N4148-1 in space-constrained, high-reliability SMT assemblies. Its UB package maintains identical electrical characteristics while delivering enhanced thermal and mechanical stability over the DO-35 version.
1N4148UB/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 3-SMD, No Lead
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 75 V
- Current - Average Rectified (Io):
- 200mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 100 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 20 ns
- Current - Reverse Leakage @ Vr:
- 500 nA @ 75 V
- Capacitance @ Vr, F:
- 4pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- UB
- Operating Temperature - Junction:
- -65°C ~ 200°C
1N4148UB/TR FAQ
1.How can I place an order for 1N4148UB/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4148UB/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 1N4148UB/TR reliable?
The price and inventory of 1N4148UB/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4148UB/TR is usually 5 days.
3.What payment methods are accepted for 1N4148UB/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4148UB/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4148UB/TR?
1N4148UB/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4148UB/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 1N4148UB/TR?
For technical support, including 1N4148UB/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4148UB/TR requirements.
6.How does Aetrix verify that 1N4148UB/TR is sourced from the original manufacturer or authorized distributors?
All 1N4148UB/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 1N4148UB/TR meets industry standards.
7.What is the process for return or replacement of 1N4148UB/TR?
All 1N4148UB/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4148UB/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 1N4148UB/TR part is unused and in its original packaging.
Return procedure for 1N4148UB/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4148UB/TR Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
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MMBD914LT3G
onsemi
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BAS16HT1G
onsemi
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1N914BWT
onsemi
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BAS21LT1G
onsemi
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LL4148
onsemi
-
BAS16LT1G
onsemi
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MMSD914T1G
onsemi
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BAV21W-7-F
Diodes Incorporated
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