My Inquiry
My Account
Microchip Technology 1N4148UBCA
- Part No.:
- 1N4148UBCA
- Manufacturer:
- Microchip Technology
- Category:
- Diode Arrays
- Package:
- 3-SMD, No Lead
- Datasheet:
-
1N4148UBCA.pdf
- Description:
- DIODE ARRAY GP 75V 200MA UBC
- Quantity:
- Payment:
- Shipping:
Inventory:5,769
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4148UBCA from Microsemi is a military-grade surface-mount switching diode in a ceramic UB package with common-anode polarity, featuring 5 ns reverse recovery time, 75 V working peak reverse voltage, and 200 mA average rectified current at 75 °C - used in high-frequency RS-232/RS-422 interface networks and Ethernet 10 Base-T receivers.
For engineers reviewing the 1N4148UBCA datasheet, 1N4148UBCA pinout, 1N4148UBCA application, or 1N4148UBCA equivalent, key selection criteria include MIL-PRF-19500/116 JAN qualification level, low 4.0 pF capacitance at 0 V, unidirectional/common-anode polarity options, thermal resistance of 120 °C/W junction-to-solder pad, and ceramic package reliability for aerospace and defense systems.
Technical Context
This device implements a silicon planar epitaxial PN junction structure optimized for fast transient response in signal routing paths. Its 5 ns reverse recovery time (trr) and 20 ns forward recovery time (tfr) enable reliable operation in >10 MHz digital switching applications, while the gold-plated nickel terminals ensure stable interconnect performance under thermal cycling.
The ceramic UB package provides hermetic sealing and a maximum junction temperature of +200 °C, supporting operation in extended ambient ranges. With 325 °C/W junction-to-ambient thermal resistance and 120 °C/W junction-to-solder pad resistance, thermal management relies on PCB copper area and solder pad design per Figure 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Recovery Time | 5 ns - enables clean signal edge transitions in >10 MHz data lines without tailing or ringing |
| Working Peak Reverse Voltage | 75 V - supports safe operation across RS-232 line transients and Ethernet PHY bias rails |
| Forward Voltage @ 10 mA | 0.8 V max - minimizes conduction loss in low-voltage logic-level clamping circuits |
| Junction Temperature Range | –65 to +200 °C - qualified for aerospace avionics and downhole instrumentation environments |
| Capacitance @ 0 V | 4.0 pF - preserves signal integrity in high-speed differential receivers (e.g., RS-422) |
| Average Rectified Current | 200 mA @ TA = 75 °C - defines continuous DC clamp current capability with derating above ambient |
| Thermal Resistance J–SP | 120 °C/W - quantifies temperature rise per watt dissipated into PCB solder pad, critical for layout design |
Pinout & Package
Ceramic UB surface-mount package with two terminals: base-mounted metallized pads, gold-plated nickel terminations, and hermetically sealed ceramic body per MIL-PRF-19500/116. Dimensions: 3.25 mm × 2.74 mm × 1.42 mm (L × W × H), weight < 0.04 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pad 1 | Anode (Common Anode configuration) | Shared anode connection for dual-diode topology; ties to positive rail or logic-high reference |
| Pad 2 | Cathode | Signal return path; connects to ground or logic-low node in clamping or steering functions |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/116 Qualification | JAN level - ensures traceable lot control, screening, and failure analysis per military reliability standards |
| Ceramic Hermetic Package | Immunity to moisture ingress and long-term parameter drift in humid or corrosive environments |
| Low Capacitance (4.0 pF) | Preserves bandwidth in >100 MHz signal paths without loading effects on transmission lines |
| Fast trr (5 ns) | Enables use in pulse shaping, sample-and-hold discharge, and high-speed logic isolation |
| Common-Anode Polarity (CA) | Supports dual-diode configurations for bidirectional ESD protection or dual-rail clamping |
Applications
| RS-232 Line Receiver Protection | Ethernet 10 Base-T Transceiver Clamping |
|---|---|
Use Scenario: Protecting UART receiver inputs against ±15 V ESD transients and cable-induced surges in industrial serial interfaces. IC Role / Device Role / Timing Role: Signal-level clamping diode placed between RS-232 input pin and local VCC/GND rails. Use Value: 75 V VRWM and 5 ns trr prevent latch-up and maintain data integrity during fast edge transitions. | Use Scenario: Limiting differential voltage swing on twisted-pair Ethernet PHY inputs to avoid overvoltage damage. IC Role / Device Role / Timing Role: Common-anode dual-diode pair providing symmetrical clamping to +3.3 V and GND rails. Use Value: 4.0 pF capacitance avoids signal distortion at 10 Mbps signaling rates; ceramic package ensures long-term stability. |
| Avionics Data Bus Interface | Downhole Sensor Signal Conditioning |
Use Scenario: Isolating ARINC 429 or MIL-STD-1553 bus receivers from induced transients in aircraft wiring harnesses. IC Role / Device Role / Timing Role: Fast-switching protection element in front-end analog conditioning stage. Use Value: –65 to +200 °C junction range and JAN qualification support operation across flight envelope extremes. | Use Scenario: Protecting analog sensor outputs in oil/gas wellhead electronics exposed to high ambient temperatures and vibration. IC Role / Device Role / Timing Role: Low-leakage signal path switch enabling multiplexed sensor readout. Use Value: 0.5 µA IR2 @ 75 V ensures minimal offset error in precision 4–20 mA loops at elevated temperatures. |
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 | Commercial-grade SOD-123 package; 4 ns trr; 100 V V(BR); no MIL qualification | Lacks JAN screening and ceramic hermeticity; unsuitable for aerospace or extended-temp deployments | Select when cost-sensitive commercial designs require faster trr but do not demand military reliability or temperature range |
| CMKD7000 TR | Dual common-cathode configuration in SOT-363; 3.5 ns trr; 70 V VRWM; RoHS-compliant | Not pin-compatible; requires PCB redesign; lower VRWM limits use in 75 V systems | Choose for space-constrained PCBs needing dual-diode function where 70 V rating suffices and MIL compliance is not required |
Compared with 1N4148UBCA, 1N4148W-7-F offers marginally faster switching but lacks hermetic packaging and military qualification, while CMKD7000 TR provides dual-diode integration in a smaller footprint at the expense of reduced reverse voltage rating and non-interchangeable pinout.
Availability
1N4148UBCA is available at Aetrix Electronics and suitable for RS-232 interface protection, Ethernet 10 Base-T transceiver clamping, and avionics data bus conditioning requiring stable component supply across extended temperature and reliability requirements.
Supply support for 1N4148UBCA 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 RF solutions for aerospace, defense, and industrial markets.
The 1N4148UBCA belongs to Microsemi's military-qualified switching diode product line, designed specifically to meet MIL-PRF-19500/116 requirements for high-reliability signal routing, transient suppression, and interface protection in mission-critical systems.
FAQ
What does the 'CA' suffix mean in 1N4148UBCA?
The 'CA' suffix in 1N4148UBCA denotes Common Anode polarity - indicating a dual-diode configuration where both anodes are internally connected to Pad 1, and cathodes terminate separately at Pad 2. This allows bidirectional clamping or dual-rail protection using a single 1N4148UBCA device in compact layouts.
Is 1N4148UBCA qualified to MIL-PRF-19500/116?
Yes, 1N4148UBCA is qualified to MIL-PRF-19500/116 at the JAN reliability level. This includes full screening per Method 5005, burn-in, temperature cycling, and hermeticity testing - all documented in Microsemi's T4-LDS-0281-2 datasheet for the 1N4148UBCA device.
What is the maximum operating temperature for 1N4148UBCA?
The 1N4148UBCA has a specified junction and storage temperature range of –65 °C to +200 °C. Its ceramic UB package and gold-plated nickel terminations sustain this full range, making it suitable for downhole, avionics, and high-temperature industrial environments where standard plastic-packaged diodes fail.
How does the 4.0 pF capacitance of 1N4148UBCA affect high-speed circuit design?
The 4.0 pF capacitance (measured at 0 V, 1 MHz) of 1N4148UBCA minimizes loading on high-frequency signal paths - preserving rise/fall times in RS-422 receivers and Ethernet PHY inputs. At 10 Mbps, this value introduces negligible delay or reflection, unlike higher-capacitance alternatives that degrade eye diagrams.
Can 1N4148UBCA replace standard 1N4148 through-hole diodes in new designs?
1N4148UBCA is the surface-mount ceramic equivalent of the JEDEC 1N4148, but it is not a direct drop-in replacement due to different package (UB vs. DO-35), polarity options (CA vs. unidirectional), and qualification level. Use 1N4148UBCA only when MIL-PRF-19500/116 compliance, hermetic sealing, or common-anode functionality is required.
1N4148UBCA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 3-SMD, No Lead
- Packaging:
- Bulk
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Common Anode
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 75 V
- Current - Average Rectified (Io) (per Diode):
- 200mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 100 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 5 ns
- Current - Reverse Leakage @ Vr:
- 500 nA @ 75 V
- Operating Temperature - Junction:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- UBC
1N4148UBCA FAQ
1.How can I place an order for 1N4148UBCA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4148UBCA 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 1N4148UBCA reliable?
The price and inventory of 1N4148UBCA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4148UBCA is usually 5 days.
3.What payment methods are accepted for 1N4148UBCA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4148UBCA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4148UBCA?
1N4148UBCA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4148UBCA 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 1N4148UBCA?
For technical support, including 1N4148UBCA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4148UBCA requirements.
6.How does Aetrix verify that 1N4148UBCA is sourced from the original manufacturer or authorized distributors?
All 1N4148UBCA 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 1N4148UBCA meets industry standards.
7.What is the process for return or replacement of 1N4148UBCA?
All 1N4148UBCA units undergo pre-shipment inspection (PSI). If there is an issue with 1N4148UBCA, 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 1N4148UBCA part is unused and in its original packaging.
Return procedure for 1N4148UBCA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4148UBCA Tags
-
BAV99-7-F
Diodes Incorporated
-
BAT54C-7-F
Diodes Incorporated
-
BAV99,215
Nexperia USA Inc.
-
BAT54SLT1G
onsemi
-
BAV70LT1G
onsemi
-
BAT54CLT1G
onsemi
-
BAT54S-7-F
Diodes Incorporated
-
BAV99LT1G
onsemi
-
BAT54S,215
Nexperia USA Inc.
-
BAS40-04LT1G
onsemi
-
MMBD1503-TP
Micro Commercial Co
-
BAV99WT1G
onsemi
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…
