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Microchip Technology UM4306SM
- Part No.:
- UM4306SM
- Manufacturer:
- Microchip Technology
- Category:
- RF Diodes
- Package:
- SQ-MELF
- Datasheet:
-
UM4306SM.pdf
- Description:
- SI PPIN HERMETIC MELF
- Quantity:
- Payment:
- Shipping:
Inventory:7,010
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Product details
Overview
UM4306SM from Microsemi is a surface-mount PIN diode optimized for RF switching and linear attenuator applications up to 1 GHz, with 600 V reverse voltage rating, 2.2 pF maximum capacitance at 100 V, 1.5 Ω max series resistance at 100 mA/100 MHz, and 20 W power dissipation capability in stud-mounted configurations. It features an extremely thick intrinsic region (≥250 µm) enabling low-distortion operation below 5 MHz transit time frequency.
For engineers reviewing the UM4306SM datasheet, UM4306SM pinout, UM4306SM application, or UM4306SM equivalent, this page delivers verified electrical parameters, thermal performance data, package-specific mounting guidance, and validated alternatives for RF front-end design, high-voltage switch matrices, and precision analog attenuators.
Technical Context
The UM4306SM implements a non-cavity, thermally matched PIN structure with isolated stud packaging option, enabling stable RF impedance control under high-power RF signal conditions. Its carrier lifetime ≥6.0 µs and I-region width ≥250 µm directly support low-harmonic distortion in linear attenuator topologies operating from HF to 1 GHz.
Designed for DC-biased RF switching, it sustains reverse voltages up to 600 V while maintaining <10 µA leakage, and exhibits dynamic resistance range from 1.5 Ω (forward conduction) to ≥200 kΩ (reverse bias), critical for high-isolation RF switch designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage | 600 V - supports RF signal swing up to ±600 V peak in series-switch configurations |
| Capacitance (CT) | 2.2 pF @ 100 V, 1 MHz - enables broadband matching in 50 Ω systems up to 1 GHz |
| Series Resistance (RS) | 1.5 Ω max @ 100 mA, 100 MHz - ensures low insertion loss (<0.1 dB) in shunt-switch layouts |
| Carrier Lifetime (τ) | 6.0 µs min - guarantees sub-5 MHz transit frequency for ultra-low THD in analog attenuators |
| I-Region Width (W) | ≥250 µm - provides high breakdown voltage and linearity under RF power stress |
| Power Dissipation (PD) | 15 W @ 25°C end-cap temperature (SM package) - defines thermal derating curve for PCB layout |
| Reverse Current (IR) | 10 µA max @ rated VR - ensures minimal leakage-induced drift in precision attenuation paths |
Pinout & Package
UM4306SM uses a surface-mount "Style SM" package with two terminals: anode and cathode. The package is non-isolated, with mechanical footprint matching Microsemi's documented "UM4300 Style SM, B Size" outline (see Page 5 of datasheet). Thermal path is via end-cap conduction to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / RF signal input in series configuration | Must be DC-biased positive relative to cathode to achieve low-RS conduction state |
| Cathode | Forward current return / RF ground reference in shunt configuration | Serves as RF return path; requires low-inductance connection to ground plane for >500 MHz operation |
Key Features
| Feature | Design Value |
|---|---|
| Extremely low distortion performance | Transit time frequency <5 MHz enables THD <−70 dBc in 10–100 MHz linear attenuators |
| Thermally matched construction | Low thermal resistance (20 °C/W end-cap) maintains RS stability across −40°C to +125°C ambient |
| Non-cavity design | Eliminates parasitic resonances above 3 GHz, preserving broadband S-parameter predictability |
| Isolated stud package option | Available as UM4306SM variant with electrically isolated cathode for floating-bias RF switch arrays |
| Surface mount compatibility | "B Size" footprint supports automated pick-and-place (0.005″ placement tolerance per datasheet) |
Applications
| High-Voltage RF Switch Matrix | Precision Analog Attenuator |
|---|---|
Use Scenario: Multi-port RF signal routing in test instrumentation requiring >40 dB isolation at 900 MHz and 600 V hold-off. IC Role / Device Role / Timing Role: Series-connected PIN diode acting as voltage-controlled RF transmission gate. Use Value: 600 V reverse rating and 1.5 Ω on-resistance enable >55 dB isolation with <0.15 dB insertion loss at 1 GHz. | Use Scenario: Programmable gain control in wideband receiver IF chain (10–500 MHz) demanding <−65 dBc harmonic distortion. IC Role / Device Role / Timing Role: Variable-resistance element in π-type attenuator network controlled by analog bias current. Use Value: 6.0 µs carrier lifetime and ≥250 µm I-region ensure distortion remains below specification across full 0–20 dB range. |
| HF Transmitter Power Control | EMI Filter Tuning Element |
Use Scenario: Forward-power limiting in 3–30 MHz HF amplifiers using diode-based automatic level control (ALC). IC Role / Device Role / Timing Role: Shunt-connected RF sensing element whose resistance modulates amplifier output stage bias. Use Value: 200 kΩ parallel resistance at 100 V reverse bias ensures minimal loading of HF tank circuits during ALC idle state. | Use Scenario: Adaptive EMI filter impedance tuning in MIL-STD-461G-compliant avionics power supplies. IC Role / Device Role / Timing Role: Bias-tunable capacitor in LC trap network, adjusting notch frequency via DC control voltage. Use Value: 2.2 pF capacitance with <10 µA leakage allows stable 10–100 kHz notch tuning without DC path disruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PIN diode switching and attenuation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UMX4306SM | RoHS-compliant version with identical electrical specs and SM footprint | No functional difference; required for EU/China RoHS-regulated production | Select UMX4306SM when lead-free compliance is mandated; same thermal and RF performance |
| UM4306C | Stud-mount package (θ = 7.5 °C/W), 20 W PD, higher thermal mass | Better suited for continuous-wave RF power handling >5 W; not surface-mountable | Choose UM4306C for high-reliability base station transceivers; UM4306SM preferred for compact SMT assemblies |
Compared with UMX4306SM, the UM4306SM offers identical RF performance but lacks RoHS certification; versus UM4306C, it trades thermal robustness for PCB area savings and automated assembly compatibility-critical for space-constrained RF modules.
Availability
UM4306SM is available at Aetrix Electronics and suitable for RF switch matrix design, precision analog attenuator development, and HF transmitter power control requiring stable component supply across industrial, defense, and test equipment programs.
Supply support for UM4306SM 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 RF, timing, and power management solutions for aerospace, defense, and industrial markets.
The UM4300 series was developed specifically for high-linearity, high-voltage RF switching and analog attenuation in military-grade communication systems and precision test instrumentation.
FAQ
What is the maximum RF frequency range supported by UM4306SM?
The UM4306SM is characterized for operation from HF through 1 GHz, with verified performance in linear attenuator and switching applications up to 1 GHz. Its 2.2 pF capacitance and 1.5 Ω series resistance support broadband 50 Ω matching in this range; operation beyond 1 GHz is possible but requires empirical validation due to uncharacterized S-parameters above that point.
Does UM4306SM require a heatsink in surface-mount applications?
UM4306SM has a thermal resistance of 20 °C/W referenced to end-cap temperature. At 15 W maximum dissipation, junction-to-end-cap rise would be 300°C-exceeding silicon limits. Therefore, the UM4306SM must be operated within its derated power envelope (e.g., ≤1.5 W at 85°C ambient) using PCB copper as heatsink; active heatsinking is not feasible due to SM package constraints.
How does UM4306SM differ from UM7306SM in RF attenuator use?
UM4306SM offers lower series resistance (1.5 Ω vs. 3.0 Ω) and higher power capability, making it preferable for high-current attenuator legs. UM7306SM provides lower capacitance (0.7 pF vs. 2.2 pF), better suited for >500 MHz applications where capacitive loading dominates. Both share identical 600 V rating and ≥6 µs carrier lifetime.
Is UM4306SM pin-compatible with other UM4300-series SM packages?
Yes-UM4306SM shares the same "B Size" surface-mount footprint with all UM4300-style SM variants (e.g., UM4301SM, UM4302SM). Mechanical dimensions, terminal width, and solder pad layout are identical per Page 5 of the datasheet, enabling drop-in replacement across voltage grades without PCB redesign.
What is the recommended DC bias circuit for UM4306SM in shunt-switch mode?
For shunt-switch operation, apply 100 mA forward current via a 50 Ω RF choke and 100 nF DC-blocking capacitor. The UM4306SM's 1.5 Ω on-resistance ensures <0.1 dB insertion loss; reverse bias must remain ≤600 V with <10 µA leakage. Bias network impedance should exceed 1 kΩ at RF frequencies to prevent signal leakage.
UM4306SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Diode Type:
- PIN - Single
- Voltage - Peak Reverse (Max):
- 600V
- Current - Max:
- -
- Capacitance @ Vr, F:
- 2.2pF @ 100V, 1MHz
- Resistance @ If, F:
- 1.5Ohm @ 100mA, 100MHz
- Power Dissipation (Max):
- 15 W
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- -
UM4306SM FAQ
1.How can I place an order for UM4306SM through Aetrix?
Please submit a Request for Quotation (RFQ) for UM4306SM 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 UM4306SM reliable?
The price and inventory of UM4306SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UM4306SM is usually 5 days.
3.What payment methods are accepted for UM4306SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UM4306SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UM4306SM?
UM4306SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UM4306SM 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 UM4306SM?
For technical support, including UM4306SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UM4306SM requirements.
6.How does Aetrix verify that UM4306SM is sourced from the original manufacturer or authorized distributors?
All UM4306SM 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 UM4306SM meets industry standards.
7.What is the process for return or replacement of UM4306SM?
All UM4306SM units undergo pre-shipment inspection (PSI). If there is an issue with UM4306SM, 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 UM4306SM part is unused and in its original packaging.
Return procedure for UM4306SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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