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Microchip Technology UM4001SM/TR
- Part No.:
- UM4001SM/TR
- Manufacturer:
- Microchip Technology
- Category:
- RF Diodes
- Package:
- SQ-MELF
- Datasheet:
-
UM4001SM/TR.pdf
- Description:
- SI PPIN HERMETIC MELF
- Quantity:
- Payment:
- Shipping:
Inventory:2,694
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Product details
Overview
UM4001SM/TR from Microsemi is a high-power RF PIN diode in surface-mount package, rated for 200 V reverse voltage, 0.5 Ω series resistance at 100 MHz, and 5–10 µs carrier lifetime. It operates in HF through S-band frequencies and is used in low-distortion RF switches and attenuators for antenna selector and cavity network applications.
For engineers reviewing the UM4001SM/TR datasheet, UM4001SM/TR pinout, UM4001SM/TR application, or UM4001SM/TR equivalent, key selection criteria include reverse voltage rating (200 V), thermal resistance under stud-mount conditions (6 °C/W), RF capacitance at 100 V (≤3 pF), parallel resistance (>10 kΩ), and compatibility with automatic insertion equipment.
Technical Context
This PIN diode leverages a thick intrinsic (I) region and long minority-carrier lifetime (>5 µs) to enable high RF power control with low DC bias current. Its non-cavity construction minimizes parasitic inductance and supports stable performance up to 3 GHz.
Designed for high-linearity RF signal routing, it exhibits low capacitance (2.4–3 pF at 100 V, 1 MHz) and high parallel resistance (10–15 kΩ at 100 V, 100 MHz), ensuring minimal insertion loss and high isolation in switched filter networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage | 200 V - Supports operation in high-voltage RF switching nodes without breakdown. |
| Series Resistance | 0.3–0.5 Ω at 100 mA / 100 MHz - Enables low insertion loss in transmit/receive paths. |
| Capacitance | 2.4–3 pF at 100 V / 1 MHz - Ensures minimal detuning of HF–S-band resonant circuits. |
| Carrier Lifetime | 5–10 µs - Allows efficient RF conduction control with modest forward bias current. |
| Parallel Resistance | 10–15 kΩ at 100 V / 100 MHz - Delivers high off-state isolation in RF attenuator stages. |
| Forward Voltage | 1.0 V at 100 mA - Defines DC bias power requirement for turn-on state. |
Pinout & Package
UM4001SM/TR uses a surface-mount (SM) package with two terminals: anode and cathode. The SM footprint accommodates solder fillet formation on both ends with ±0.005″ placement tolerance and supports adhesive-assisted mounting per Microsemi mechanical notes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward-biased terminal | DC current entry point; controls RF conduction when biased above ~1 V. |
| Cathode | Reverse-biased terminal | DC return path; defines RF signal reference during reverse-bias isolation mode. |
Key Features
| Feature | Design Value |
|---|---|
| Thermally matched configuration | Enables stable RF performance across temperature swings in high-power phase shifters. |
| Low capacitance at 0 V bias | Reduces signal leakage and maintains impedance match in unpowered RF paths. |
| Non-cavity design | Eliminates resonant cavity effects that cause spurious response in broadband filters. |
| Compatible with automatic insertion equipment | Supports high-volume PCB assembly without manual handling or rework. |
Applications
| Antenna Selector Networks | High-Power RF Attenuators |
|---|---|
Use Scenario: Switching between multiple antennas in radar or SATCOM front-ends while maintaining signal integrity across S-band. IC Role / Device Role / Timing Role: PIN diode acts as a low-loss, high-isolation RF switch element controlled by DC bias. Use Value: 200 V reverse rating and <3 pF capacitance prevent detuning and support >30 dB isolation at 3 GHz. | Use Scenario: Precision variable attenuation in test equipment and transmitter output stages operating up to 2 kW peak. IC Role / Device Role / Timing Role: Functions as a voltage-controlled RF resistor via forward bias current modulation. Use Value: 5–10 µs carrier lifetime enables linear attenuation control with sub-100 mA bias current. |
| UHF Phase Shifters | Megawatt Duplexers |
Use Scenario: Digital phase shifting in active electronically scanned arrays (AESA) requiring repeatable 22.5°/45° steps. IC Role / Device Role / Timing Role: Switches inductive/capacitive elements into cavity-based delay lines. Use Value: Thermally matched configuration ensures phase stability over 1000+ hours of continuous operation. | Use Scenario: Transmit/receive isolation in pulsed radar systems handling 100 kW peak RF pulses. IC Role / Device Role / Timing Role: High-charge-storage PIN diode provides fast recovery and low distortion during pulse transitions. Use Value: 100 kW pulse rating and >10 kΩ parallel resistance sustain isolation during high-dV/dt events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-power RF PIN diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UMX4001SM | RoHS-compliant matte tin finish; identical electrical specs and SM package. | No functional difference; selected where lead-free compliance is mandatory. | Direct drop-in replacement for UM4001SM/TR in RoHS-regulated designs. |
| UM4901SM | Same 200 V rating and SM package, but higher power dissipation (37.5 W vs. 20 W) and lower thermal resistance (4 °C/W vs. 7 °C/W). | Better suited for continuous-wave (CW) high-duty-cycle applications requiring enhanced thermal management. | Preferred when ambient temperature or PCB copper area limits thermal performance of UM4001SM/TR. |
Compared with UM4001SM/TR, UMX4001SM offers identical RF performance with lead-free compliance, while UM4901SM delivers superior thermal capability at the cost of higher price and slightly larger die-making each optimal for distinct reliability or regulatory requirements.
Availability
UM4001SM/TR is available at Aetrix Electronics and suitable for antenna selector networks, high-power RF attenuators, and UHF phase shifters requiring stable component supply across aerospace, defense, and test instrumentation programs.
Supply support for UM4001SM/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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and RF components for aerospace, defense, and industrial markets.
The UM4000/UM4900 series was designed specifically for high-power, low-distortion RF switching in mission-critical microwave systems including radar, SATCOM, and electronic warfare platforms.
FAQ
What is the maximum reverse voltage rating for UM4001SM/TR?
The UM4001SM/TR has a specified reverse voltage rating of 200 V at 10 µA leakage current. This rating is validated under standard test conditions and supports reliable operation in high-voltage RF switching applications such as antenna selectors and duplexers. Exceeding this voltage risks irreversible junction breakdown. The UM4001SM/TR datasheet confirms this value on Page 1 under "VOLTAGE RATINGS".
Does UM4001SM/TR support automatic PCB assembly?
Yes, UM4001SM/TR is explicitly designed for compatibility with automatic insertion equipment, as stated in the "KEY FEATURES" section of the official Microsemi datasheet. Its SM package footprint, defined on Page 6, includes dimensional tolerances and solder fillet allowances optimized for pick-and-place and reflow processes. No manual handling or post-assembly adjustment is required.
How does carrier lifetime affect UM4001SM/TR performance in RF switches?
The UM4001SM/TR features a carrier lifetime of 5–10 µs, enabling efficient RF conduction control with low forward bias current. Longer lifetime improves linearity and reduces harmonic distortion in high-power switching, especially in S-band phase shifters. This parameter directly impacts intermodulation performance and is measured per the IF = 10 mA condition specified in the Electrical Parameters table on Page 2.
What is the thermal resistance of UM4001SM/TR under end-cap mounting?
Under 25 °C end-cap temperature condition (Package Type SM), the UM4001SM/TR has a thermal resistance (θ) of 7 °C/W, as listed in the "ABSOLUTE MAXIMUM RATINGS" table on Page 1. This value reflects the thermal path from junction to end-cap and determines maximum allowable power dissipation in surface-mount configurations with limited heatsinking.
Is UM4001SM/TR RoHS compliant?
No, UM4001SM/TR uses a standard Sn/Pb finish and is not RoHS compliant. For RoHS-compliant versions, Microsemi specifies the UMX prefix (e.g., UMX4001SM), which uses matte tin plating per EU Directive 2002/95/EC. The distinction is clearly documented on Page 1 under "DESCRIPTION" and "IMPORTANT" notes.
UM4001SM/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- UM4000
- Package/Case:
- SQ-MELF
- Packaging:
- Tray
- Product Status:
- Active
- Diode Type:
- PIN - Single
- Voltage - Peak Reverse (Max):
- 100V
- Current - Max:
- -
- Capacitance @ Vr, F:
- 3pF @ 100V, 1MHz
- Resistance @ If, F:
- 500mOhm @ 100mA, 100MHz
- Power Dissipation (Max):
- 100000 W
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- -
UM4001SM/TR FAQ
1.How can I place an order for UM4001SM/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for UM4001SM/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 UM4001SM/TR reliable?
The price and inventory of UM4001SM/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UM4001SM/TR is usually 5 days.
3.What payment methods are accepted for UM4001SM/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UM4001SM/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UM4001SM/TR?
UM4001SM/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UM4001SM/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 UM4001SM/TR?
For technical support, including UM4001SM/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UM4001SM/TR requirements.
6.How does Aetrix verify that UM4001SM/TR is sourced from the original manufacturer or authorized distributors?
All UM4001SM/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 UM4001SM/TR meets industry standards.
7.What is the process for return or replacement of UM4001SM/TR?
All UM4001SM/TR units undergo pre-shipment inspection (PSI). If there is an issue with UM4001SM/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 UM4001SM/TR part is unused and in its original packaging.
Return procedure for UM4001SM/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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