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SST5484-E3 Equivalent & Substitute Parts
Part Overview
The SST5484-E3 is an N-Channel JFET transistor manufactured by Vishay Siliconix, rated for 25 V breakdown voltage with 350 mW power dissipation in a surface mount SOT-23 package. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage ratings, current characteristics, and thermal performance while conforming to the same physical package specification.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| FET Type | N-Channel JFET | — |
| Voltage - Breakdown (V(BR)GSS) | 25 | V |
| Current - Drain (Idss) @ Vds (Vgs=0) | 1 | mA @ 15 V |
| Voltage - Cutoff (VGS off) @ Id | 300 | mV @ 10 nA |
| Input Capacitance (Ciss) (Max) @ Vds | 5 | pF @ 15 V |
| Power - Max | 350 | mW |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | TO-236-3, SC-59, SOT-23-3 | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution eligibility for the SST5484-E3 is determined by the following criteria:
Primary Compatibility Requirements:
- N-Channel JFET configuration
- Voltage - Breakdown (V(BR)GSS) rating of 25 V or higher
- Surface mount SOT-23-3 package (TO-236-3, SC-59)
- Operating temperature range supporting -55°C to 150°C
- RoHS3 compliance and MSL 1 rating
Secondary Electrical Considerations:
- Current - Drain (Idss) characteristics must not exceed application maximum current requirements
- Voltage - Cutoff (VGS off) must be compatible with gate drive circuitry
- Input Capacitance (Ciss) should align with circuit switching speed requirements
- Power dissipation capability must meet or exceed 350 mW
The substitute parts listed below satisfy the primary compatibility requirements and maintain electrical performance within acceptable operating margins for direct substitution in applications designed for the SST5484-E3.
Parameter Comparison
| Part Number | Manufacturer | V(BR)GSS (V) | Idss @ 15V (mA) | VGS off @ 10nA (V) | Ciss @ 15V (pF) | Power Max (mW) | Product Status | Package |
|---|---|---|---|---|---|---|---|---|
| SST5484-E3 | Vishay Siliconix | 25 | 1 | 0.3 | 5 | 350 | Obsolete | SOT-23-3 |
| MMBFJ108 | onsemi | 25 | 80 | 3 | — | 350 | Active | SOT-23-3 |
| MMBFJ110 | onsemi | 25 | 10 | 4 | — | 460 | Active | SOT-23-3 |
| MMBFJ211 | onsemi | 25 | — | — | — | — | Active | SOT-23-3 |
| MMBFJ309LT1G | onsemi | 25 | — | — | — | — | Active | SOT-23-3 |
| MMBFJ310LT1G | onsemi | 25 | — | — | — | — | Active | SOT-23-3 |
| MMBFJ310LT3G | onsemi | 25 | — | — | — | — | Active | SOT-23-3 |
| MMBFU310LT1G | onsemi | 25 | 24 | 2.5 | 5 | 225 | Active | SOT-23-3 |
| MMBF5484 | onsemi | 25 | — | — | — | — | Active | SOT-23-3 |
| MMBF5485 | onsemi | 25 | — | — | — | — | Active | SOT-23-3 |
| MMBF5486 | onsemi | 25 | — | — | — | — | Active | SOT-23-3 |
Engineering Selection Recommendations
All listed substitute parts are manufactured by onsemi and carry active product status, ensuring long-term availability and manufacturing support. Each substitute maintains RoHS3 compliance and MSL 1 rating, meeting the environmental and reliability standards of the original SST5484-E3.
MMBFJ108 and MMBFU310LT1G provide the most direct electrical alignment with the SST5484-E3, both offering 25 V breakdown voltage and matching input capacitance specifications. MMBFJ108 is available in Cut Tape packaging with 1,106 units in stock, while MMBFU310LT1G offers higher current capacity (24 mA Idss) with 28,400 units available in Cut Tape format.
MMBFJ110 extends power dissipation capability to 460 mW and is available in Tape & Reel packaging with 1,616 units in stock, suitable for applications requiring enhanced thermal margin.
MMBF5484, MMBF5485, and MMBF5486 represent the onsemi RF MOSFET JFET series with 400 MHz frequency capability. These parts maintain 25 V rated voltage and SOT-23-3 package compatibility. MMBF5485 offers the highest inventory availability at 65,200 units in Tape & Reel format.
MMBFJ309LT1G, MMBFJ310LT1G, and MMBFJ310LT3G are RF MOSFET JFET variants with 25 V rated voltage and SOT-23-3 packaging. MMBFJ310LT1G and MMBFJ310LT3G feature 12 dB gain specification and are available in high quantities (33,758 and 9,201 units respectively).
MMBFJ211 is an active RF MOSFET JFET option with 25 V rating and 1,620 units in stock.
Selection should prioritize parts with highest inventory availability and active manufacturing status to ensure supply chain continuity.
Frequently Asked Questions (FAQ)
Q: Can MMBFJ108 directly replace SST5484-E3 in all applications?
A: MMBFJ108 meets the primary compatibility criteria: N-Channel JFET, 25 V breakdown voltage, SOT-23-3 package, and matching input capacitance (5 pF @ 15 V). However, Idss is significantly higher (80 mA vs. 1 mA), which may affect circuit biasing. Verify gate drive and current limiting circuitry can accommodate this difference.
Q: What is the difference between MMBFJ310LT1G and MMBFJ310LT3G?
A: Both parts are electrically identical N-Channel JFETs with 25 V rating, 10 V test voltage, 60 mA current rating, and 12 dB gain. The primary difference is packaging: MMBFJ310LT1G is supplied in Cut Tape (CT) & Digi-Reel format, while MMBFJ310LT3G is supplied in Tape & Reel (TR) format. Select based on procurement and assembly requirements.
Q: Are MMBF5484, MMBF5485, and MMBF5486 interchangeable?
A: All three parts share N-Channel JFET configuration, 25 V rated voltage, 400 MHz frequency, and SOT-23-3 packaging. The primary difference is current rating: MMBF5484 at 5 mA, MMBF5485 at 10 mA, and MMBF5486 at 20 mA. Select based on application current requirements.
Q: Does MMBFU310LT1G have lower power dissipation than SST5484-E3?
A: Yes. MMBFU310LT1G is rated for 225 mW maximum power dissipation compared to SST5484-E3 at 350 mW. Verify thermal requirements in your application before substitution.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts carry RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental standards of the original SST5484-E3.
Q: Which substitute offers the best inventory availability?
A: MMBF5485 provides the highest stock level at 65,200 units in Tape & Reel format, followed by MMBFJ310LT1G at 33,758 units in Cut Tape format.
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