ASPI-0418S-8R2N-T3 Equivalent & Substitute Parts

Part Overview

The ASPI-0418S-8R2N-T3 is an 8.2 µH shielded drum core wirewound inductor manufactured by Abracon LLC, rated for 1.1 A maximum current with 163mOhm DC resistance. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing production and maintenance applications. The substitute part SRP4012TA-8R2M from Bourns Inc. maintains the same inductance value while offering improved current handling and active product status.

Key Parameters

Parameter	Value
Inductance	8.2 µH
Inductance Tolerance	±30%
Current Rating	1.1 A
DC Resistance (DCR)	163mOhm Max
Core Material	Ferrite
Shielding	Shielded
Mounting Type	Surface Mount
Operating Temperature Range	-25°C ~ 100°C
Package Type	Nonstandard
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ASPI-0418S-8R2N-T3 with SRP4012TA-8R2M is based on the following critical parameters:

Matching Parameters:

Inductance value: 8.2 µH (identical)
Inductance test frequency: 100 kHz (identical)
Shielding: Both shielded designs
Mounting type: Surface mount
RoHS3 compliance: Both compliant
Core type: Both drum core wirewound construction

Allowable Variations:

Current rating: 1.1 A (main part) vs. 1.4 A (substitute) — substitute provides higher current capacity
DC resistance: 163mOhm (main part) vs. 376mOhm (substitute) — substitute has higher DCR but remains within acceptable operating parameters for equivalent inductance
Core material: Ferrite (main part) vs. Carbonyl Powder (substitute) — both materials support shielded drum core construction
Tolerance: ±30% (main part) vs. ±20% (substitute) — substitute offers tighter tolerance
Operating temperature: -25°C ~ 100°C (main part) vs. -40°C ~ 150°C (substitute) — substitute supports extended range
Package dimensions: Nonstandard (main part) vs. 2-SMD (substitute) — both surface mount configurations

Parameter Comparison

Parameter	ASPI-0418S-8R2N-T3	SRP4012TA-8R2M
Manufacturer	Abracon LLC	Bourns Inc.
Inductance	8.2 µH	8.2 µH
Inductance Tolerance	±30%	±20%
Current Rating (Amps)	1.1 A	1.4 A
Current - Saturation (Isat)	900mA	1.6A
DC Resistance (DCR)	163mOhm Max	376mOhm Max
Core Material	Ferrite	Carbonyl Powder
Shielding	Shielded	Shielded
Q @ Freq	—	10 @ 100kHz
Frequency - Self Resonant	—	25MHz
Operating Temperature	-25°C ~ 100°C	-40°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	Nonstandard	2-SMD
Size / Dimension	0.165" L x 0.165" W (4.20mm x 4.20mm)	0.175" L x 0.160" W (4.45mm x 4.06mm)
Height - Seated (Max)	0.071" (1.80mm)	0.047" (1.20mm)
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The SRP4012TA-8R2M is the designated substitute for the obsolete ASPI-0418S-8R2N-T3 based on the following factors:

Product Status: The main part is obsolete, while the substitute maintains active product status with established supply chain availability.

Compliance & Certifications: Both parts are ROHS3 compliant and REACH unaffected. The substitute carries AEC-Q200 qualification, providing automotive-grade reliability assurance.

Electrical Equivalence: Both inductors maintain 8.2 µH inductance at 100 kHz test frequency. The substitute's higher current rating (1.4 A vs. 1.1 A) and saturation current (1.6A vs. 900mA) provide design margin for applications operating near the original part's current limits.

Physical Compatibility: Dimensional differences are minimal. The substitute is slightly larger in length (4.45mm vs. 4.20mm) and width (4.06mm vs. 4.20mm) but significantly lower in height (1.20mm vs. 1.80mm). PCB layout verification is required for height-constrained applications.

Core Material Transition: The shift from ferrite to carbonyl powder core material maintains shielding performance while offering improved saturation characteristics. This transition is standard practice in inductor substitution for equivalent inductance values.

Frequently Asked Questions (FAQ)

Q: Can SRP4012TA-8R2M be used as a direct replacement for ASPI-0418S-8R2N-T3?

A: Yes, for applications where the circuit operates at or below 1.1 A. The substitute's higher current rating ensures compatibility. PCB layout must accommodate the dimensional differences, particularly the reduced height (1.20mm vs. 1.80mm).

Q: What is the impact of the higher DC resistance in the substitute part?

A: The SRP4012TA-8R2M has 376mOhm DCR compared to 163mOhm in the original part. This increases power dissipation proportionally to current squared. For a 1.1 A circuit, the substitute dissipates approximately 0.45 W versus 0.20 W in the original. Thermal design review is necessary for power-sensitive applications.

Q: Are there package compatibility concerns?

A: The main part uses a nonstandard package while the substitute uses 2-SMD configuration. Both are surface mount designs. Verify PCB footprint compatibility and reflow profile suitability before production transition.

Q: Does the core material change affect circuit performance?

A: Both ferrite and carbonyl powder cores support shielded drum core construction at 8.2 µH. The carbonyl powder core in the substitute provides superior saturation performance (1.6A vs. 900mA) and defined Q factor (10 @ 100kHz). For linear operation below saturation, performance is equivalent.

Q: What is the temperature operating range difference?

A: The substitute operates from -40°C to 150°C versus -25°C to 100°C for the original part. This extended range provides additional design flexibility for industrial and automotive applications.

Q: Is AEC-Q200 qualification relevant for my application?

A: AEC-Q200 certification indicates automotive-grade reliability testing. This qualification is beneficial for automotive, industrial, and mission-critical applications but not required for general commercial use.

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