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Microchip Technology UM4001SM
- Part No.:
- UM4001SM
- Manufacturer:
- Microchip Technology
- Category:
- RF Diodes
- Package:
- SQ-MELF
- Datasheet:
-
UM4001SM.pdf
- Description:
- SI PPIN HERMETIC MELF
- Quantity:
- Payment:
- Shipping:
Inventory:3,281
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Product details
Overview
UM4001SM 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 µs minimum carrier lifetime. It operates in HF–S band switches and attenuators with low distortion, supporting antenna selector and cavity network switching in UHF phase shifters and megawatt duplexers.
For engineers reviewing the UM4001SM datasheet, UM4001SM pinout, UM4001SM application, or UM4001SM 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 uses 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 design and thermally matched configuration support stable operation under pulsed RF loads up to 100 kW peak.
Electrical equivalence between UM4000 and UM4900 families is confirmed, but UM4001SM belongs specifically to the UM4000 series with Sn/Pb finish and 200 V reverse voltage rating. It shares Style "SM" footprint and mechanical dimensions per Microsemi's Page 6 mechanical drawings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage | 200 V - Maximum blocking voltage before leakage exceeds 10 µA; defines safe RF peak-voltage margin in switch/attenuator designs. |
| Series Resistance | 0.5 Ω max at 100 MHz, 100 mA - Directly impacts insertion loss and power handling in RF conduction path. |
| Carrier Lifetime | ≥5 µs - Enables efficient RF control at HF–S band with low bias current; critical for low-distortion switching. |
| Capacitance | ≤3 pF at 100 V, 1 MHz - Determines off-state isolation and tuning range in filter/cavity networks. |
| Parallel Resistance | ≥10 kΩ at 100 V, 100 MHz - Sets off-state RF leakage and attenuation depth in high-isolation applications. |
| Forward Voltage | 1.0 V typ at 100 mA - Defines DC drive requirements and thermal dissipation during forward conduction. |
Pinout & Package
UM4001SM uses a two-terminal surface-mount package (Style "SM") with symmetrical anode/cathode terminals on opposite ends of a rectangular ceramic body. No polarity marking; device is bidirectional in RF function but requires correct DC bias polarity for intended switching state.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC forward bias input / RF signal entry in series switch | Applied positive DC bias enables low-RS conduction path; RF signal flows through I-region when forward-biased. |
| Cathode | DC return / RF signal exit in series switch | Completes DC bias loop; serves as RF output node in series configuration or ground reference in shunt configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Thermally matched configuration | Enables stable RF performance across temperature swings in high-power UHF phase shifters without recalibration. |
| Non-cavity design | Eliminates resonant modes and parasitic coupling in S-band operation; improves broadband matching stability. |
| Low capacitance at 0 V bias | Minimizes off-state RF feedthrough and preserves filter stopband rejection in antenna coupler applications. |
| Compatible with automatic insertion equipment | Supports high-volume manufacturing of RF front-end modules using standard pick-and-place systems. |
Applications
| UHF Phase Shifters | Megawatt Peak-Power Duplexers |
|---|---|
Use Scenario: Beam steering arrays in radar transceivers requiring precise, repeatable phase control over wide temperature ranges. IC Role / Device Role / Timing Role: PIN diode switch element controlling RF path length via switched delay lines in distributed phase shifter topologies. Use Value: Long carrier lifetime (>5 µs) and thermally matched construction ensure phase error < ±2° over –40°C to +125°C. | Use Scenario: Transmit/receive isolation in high-power ground-based radar systems operating at S-band with 100 kW peak pulses. IC Role / Device Role / Timing Role: High-peak-power RF switch protecting receiver front-end during transmitter pulse bursts. Use Value: 100 kW pulse rating and 200 V reverse voltage allow safe operation with >3× safety margin versus 60 V typical T/R switch bias. |
| Antenna Selector Networks | Cavity Filter Tuning |
Use Scenario: Multi-band base station radios selecting among directional antennas based on traffic load and channel conditions. IC Role / Device Role / Timing Role: RF series/shunt switch enabling reconfiguration of antenna feed paths without mechanical relays. Use Value: Low series resistance (0.5 Ω) and low capacitance (≤3 pF) maintain VSWR <1.25 across 30–3000 MHz bandwidth. | Use Scenario: Adaptive filtering in electronic warfare jammers where cavity resonance must be dynamically shifted across threat bands. IC Role / Device Role / Timing Role: Shunt-connected PIN diode switching inductors/capacitors into/out of cavity coupling loops. Use Value: High parallel resistance (>10 kΩ) ensures minimal loaded-Q degradation when diode is reverse-biased. |
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; same 200 V rating and 0.5 Ω RS. | Required for new designs targeting EU compliance; no change in RF performance or thermal behavior. | Select UMX4001SM when RoHS compliance is mandatory; otherwise UM4001SM remains valid for legacy Sn/Pb assembly. |
| UM4001D | Stud-mount package (Style "D"), 25 W power dissipation at 25°C stud temp, θJA = 6 °C/W; same 200 V, 0.5 Ω, ≥5 µs specs. | Used in high-power chassis-mounted amplifiers and broadcast transmitters where forced-air or liquid cooling is available. | Choose UM4001D for higher continuous power (25 W vs. UM4001SM's 20 W end-cap limit) and direct thermal sinking; UM4001SM suits compact SMT layouts. |
Compared with UM4001SM, UMX4001SM offers identical RF performance with RoHS compliance, while UM4001D trades surface-mount convenience for higher thermal capacity via stud mounting-enabling 25% more continuous power in cooled systems.
Availability
UM4001SM is available at Aetrix Electronics and suitable for UHF phase shifters, megawatt duplexers, antenna selector networks, and cavity filter tuning requiring stable component supply across military, aerospace, and broadcast RF programs.
Supply support for UM4001SM 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) designs high-reliability analog and RF semiconductors for defense, aerospace, and communications infrastructure.
The UM4000 series was developed specifically for high-power RF switching in radar, EW, and broadcast systems where low distortion, thermal stability, and proven field reliability are mandatory.
FAQ
What is the maximum reverse voltage rating for UM4001SM?
The UM4001SM has a reverse voltage rating of 200 V at 10 µA leakage current, as specified in Microsemi's UM4000/UM4900 datasheet. This rating ensures reliable blocking of RF signals in high-isolation switch and attenuator configurations up to S-band frequencies. The UM4001SM maintains this rating across its full operating temperature range when mounted per Style "SM" footprint guidelines.
Does UM4001SM support automatic placement in SMT assembly lines?
Yes, UM4001SM is explicitly designed for compatibility with automatic insertion equipment, as confirmed in the "KEY FEATURES" section of the Microsemi datasheet. Its Style "SM" footprint, symmetrical terminal geometry, and Sn/Pb finish enable reliable pick-and-place accuracy within ±0.005″, supporting high-yield RF module manufacturing without manual rework.
How does UM4001SM achieve low distortion in RF switches?
UM4001SM achieves low distortion through a thick intrinsic region and long carrier lifetime (>5 µs), which allows high RF current swing with minimal harmonic generation under low DC bias. Its 0.5 Ω series resistance and ≤3 pF capacitance ensure linear conduction and clean off-state isolation-key for maintaining EVM and ACPR in broadband RF switch applications.
What is the thermal resistance of UM4001SM under standard mounting conditions?
UM4001SM is rated for 20 W power dissipation at 25°C end-cap temperature, corresponding to a thermal resistance of 7 °C/W (θEC) as listed in the Absolute Maximum Ratings table. This value assumes proper solder attachment to a thermally conductive PCB pad per Style "SM" footprint notes; forced-air cooling or copper pour can further reduce effective θJA.
Is UM4001SM suitable for pulsed RF applications like radar duplexers?
Yes, UM4001SM is qualified for pulsed RF applications including megawatt peak-power duplexers, with a 100 kW single-pulse rating at 1 µs pulse width. Its robust construction, non-cavity design, and high parallel resistance (>10 kΩ) prevent arcing and maintain isolation during rapid RF transitions-validated by thousands of operational hours in deployed radar systems.
UM4001SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- UM4000
- Package/Case:
- SQ-MELF
- Packaging:
- Tape & Reel (TR)
- 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 FAQ
1.How can I place an order for UM4001SM through Aetrix?
Please submit a Request for Quotation (RFQ) for UM4001SM 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 reliable?
The price and inventory of UM4001SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UM4001SM is usually 5 days.
3.What payment methods are accepted for UM4001SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UM4001SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UM4001SM?
UM4001SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UM4001SM 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?
For technical support, including UM4001SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UM4001SM requirements.
6.How does Aetrix verify that UM4001SM is sourced from the original manufacturer or authorized distributors?
All UM4001SM 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 meets industry standards.
7.What is the process for return or replacement of UM4001SM?
All UM4001SM units undergo pre-shipment inspection (PSI). If there is an issue with UM4001SM, 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 part is unused and in its original packaging.
Return procedure for UM4001SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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