SST5486-E3 JFET N-Channel Equivalent & Substitute Parts

Part Overview

The SST5486-E3 is a JFET N-Channel transistor rated for 25 V breakdown voltage with 350 mW power dissipation in a surface mount SOT-23 package. Manufactured by Vishay Siliconix, this component is classified as obsolete. Due to its obsolete status and limited inventory (795 pcs), identifying active equivalent and substitute parts is necessary for design continuity and procurement reliability.

Key Parameters

Parameter	Value
FET Type	N-Channel JFET
Voltage - Breakdown (V(BR)GSS)	25 V
Current - Drain (Idss) @ Vds (Vgs=0)	8 mA @ 15 V
Voltage - Cutoff (VGS off) @ Id	2 V @ 10 nA
Input Capacitance (Ciss) (Max) @ Vds	5 pF @ 15 V
Power - Max	350 mW
Operating Temperature	-55°C ~ 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 SST5486-E3 is determined by the following critical parameters:

Package Compatibility: All substitutes must use TO-236-3, SC-59, or SOT-23-3 surface mount packaging
Voltage Rating: Minimum V(BR)GSS of 25 V required
Power Dissipation: Minimum 350 mW power rating
Configuration: N-Channel JFET technology
Temperature Range: Operating range of -55°C to 150°C (TJ)
Compliance: ROHS3 compliance and MSL 1 rating

The substitute parts are grouped into two categories based on electrical performance alignment:

Category A - Direct Functional Equivalents (MMBF5457, MMBFJ108, MMBFJ110, MMBFJ211): Active parts with matching voltage ratings, package specifications, and temperature ranges. These parts maintain the same mechanical footprint and electrical operating envelope.

Category B - Performance-Variant Substitutes (MMBF5484, MMBF5485, MMBF5486, MMBFJ309LT1G, MMBFJ310LT1G, MMBFJ310LT3G): Active parts with identical package and voltage specifications but differing drain current (Idss) or cutoff voltage characteristics. These require circuit-level verification for application suitability.

Parameter Comparison

Part Number	Manufacturer	Product Status	V(BR)GSS (V)	Idss @ 15V (mA)	VGS off @ 10nA (V)	Ciss @ 15V (pF)	Power Max (mW)	Package	Temp Range (°C)
SST5486-E3	Vishay Siliconix	Obsolete	25	8	2	5	350	SOT-23-3	-55 ~ 150
MMBF5457	onsemi	Active	25	1	0.5	7	350	SOT-23-3	-55 ~ 150
MMBF5484	onsemi	Active	25	5	—	—	—	SOT-23-3	—
MMBF5485	onsemi	Active	25	10	—	—	—	SOT-23-3	—
MMBF5486	onsemi	Active	25	20	—	—	—	SOT-23-3	—
MMBFJ108	onsemi	Active	25	80	3	—	350	SOT-23-3	-55 ~ 150
MMBFJ110	onsemi	Active	25	10	4	—	460	SOT-23-3	—
MMBFJ211	onsemi	Active	25	20	—	—	—	SOT-23-3	—
MMBFJ309LT1G	onsemi	Active	25	30	—	—	—	SOT-23-3	—
MMBFJ310LT1G	onsemi	Active	25	60	—	—	—	SOT-23-3	—
MMBFJ310LT3G	onsemi	Active	25	60	—	—	—	SOT-23-3	—

Engineering Selection Recommendations

Primary Recommendation: MMBF5457

The MMBF5457 from onsemi is the preferred substitute for the SST5486-E3. This part maintains active product status with established supply chain availability (35,400 pcs in stock). It shares identical voltage rating (25 V), power dissipation (350 mW), package specification (SOT-23-3), and operating temperature range (-55°C to 150°C). Both components carry ROHS3 compliance and MSL 1 rating. The primary electrical difference is lower Idss (1 mA vs. 8 mA), which represents a more conservative operating point suitable for most applications designed for the original part.

Secondary Recommendations: MMBFJ108, MMBFJ110

MMBFJ108 and MMBFJ110 are active onsemi alternatives with matching voltage and package specifications. MMBFJ108 exhibits higher Idss (80 mA), requiring circuit validation for drain current compatibility. MMBFJ110 provides 460 mW power rating, exceeding the original specification. Both maintain ROHS3 and MSL 1 compliance.

Alternative Options: MMBF5484, MMBF5485, MMBF5486, MMBFJ211, MMBFJ309LT1G, MMBFJ310LT1G, MMBFJ310LT3G

These parts meet package and voltage requirements but exhibit varying drain current specifications (5 mA to 60 mA). Selection requires verification that circuit design accommodates the specified Idss range. All maintain ROHS3 compliance and SOT-23-3 packaging.

Frequently Asked Questions (FAQ)

Q: Can MMBFJ108 directly replace SST5486-E3 in all applications?

A: MMBFJ108 shares the same package, voltage rating, and temperature range. However, its Idss of 80 mA is significantly higher than the original 8 mA specification. Direct substitution is valid only if the circuit design accommodates this higher drain current. Review bias network and load impedance calculations before implementation.

Q: What is the difference between MMBFJ310LT1G and MMBFJ310LT3G?

A: Both parts are electrically identical with 25 V rating and 60 mA Idss. The difference is packaging format: LT1G is supplied in Cut Tape (CT) & Digi-Reel format, while LT3G is supplied in Tape & Reel (TR) format. Selection depends on procurement and assembly requirements.

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 original SST5486-E3 specifications.

Q: Why does MMBF5457 have lower Idss than SST5486-E3?

A: Idss variation is inherent to JFET manufacturing tolerances and design parameters. MMBF5457's lower Idss (1 mA) represents a different design point within the 25 V N-Channel JFET category. Circuit performance depends on application requirements; lower Idss may provide improved bias stability in certain configurations.

Q: Can I use MMBFJ310LT1G as a direct replacement?

A: MMBFJ310LT1G meets package and voltage requirements but operates at 60 mA Idss, significantly higher than the original 8 mA. This part is suitable only if circuit design verification confirms compatibility with the higher drain current specification.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. ECCN classification is EAR99 for all parts.

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