AISC-0402F-70NM-T Equivalent & Substitute Parts

Part Overview

The AISC-0402F-70NM-T is a 70 nH unshielded drum core wirewound inductor manufactured by Abracon LLC in a 0402 (1005 Metric) surface mount package. This component is rated for 820 mA continuous current with a maximum DC resistance of 120 mOhm and operates across the temperature range of -40°C to 85°C. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production continuity.

Substiute Parts

AISC-0402F-70NM-T

Abracon LLCIn Stock: 996AISC-0402F-70NM-T Datasheet

Current PartRFQ

AISC-0402HP-68NJ-T

Abracon LLCIn Stock: 1056AISC-0402HP-68NJ-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AISC-0402F-70NM-T is evaluated based on the following critical parameters:

Package Compatibility: Both the main part and substitute must use the 0402 (1005 Metric) surface mount package to ensure mechanical and electrical compatibility on printed circuit boards.

Inductance Value: The substitute AISC-0402HP-68NJ-T provides 68 nH, which falls within the tolerance band of the original 70 nH specification (±20% tolerance = 56 nH to 84 nH range).

Current Rating: The substitute part is rated for 320 mA continuous current, which is lower than the original 820 mA rating. This represents a significant derating and restricts the substitute to applications with reduced current requirements.

DC Resistance: The substitute exhibits 950 mOhm maximum DC resistance compared to the original 120 mOhm maximum. This higher resistance increases power dissipation and thermal effects in the circuit.

Shielding Configuration: Both parts are unshielded drum core wirewound inductors, maintaining electromagnetic compatibility characteristics.

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity.

Parameter Comparison

Engineering Selection Recommendations

The AISC-0402HP-68NJ-T serves as a functional substitute for the obsolete AISC-0402F-70NM-T in applications where the following conditions are satisfied:

Current Requirement Constraint: Circuit designs must operate at or below 320 mA. Applications requiring the full 820 mA current capacity of the original part cannot use this substitute without risking component failure or thermal damage.

DC Resistance Tolerance: The 7.9× increase in DC resistance (from 120 mOhm to 950 mOhm) results in proportionally higher power dissipation. Circuit designs must accommodate this increased resistive loss, particularly in high-frequency or high-current pulse applications.

Inductance Accuracy: The substitute's ±5% tolerance provides superior inductance accuracy compared to the original ±20% tolerance, benefiting applications with tight inductance specifications.

Temperature Operating Range: The substitute supports operation to 125°C, extending the upper temperature limit by 40°C relative to the original part. This is advantageous for high-temperature environments.

Core Material Difference: The substitute uses ceramic core material versus the original ferrite core. This affects frequency response characteristics and Q-factor performance. The substitute exhibits a higher self-resonant frequency (1.84 GHz versus 1.3 GHz), which may influence high-frequency circuit behavior.

Regulatory and Compliance Status: Both parts maintain ROHS3 compliance and REACH unaffected status. The substitute is in active production, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the AISC-0402HP-68NJ-T directly replace the AISC-0402F-70NM-T in all applications?

A: No. The substitute is suitable only for applications operating at 320 mA or below. The original part supports 820 mA continuous current. Applications requiring higher current must source alternative parts rated for the necessary current level.

Q: How does the inductance difference of 2 nH affect circuit performance?

A: The 2 nH difference (70 nH to 68 nH) represents 2.9% of the original value and falls within the original part's ±20% tolerance specification. For most RF and filtering applications, this difference is negligible. However, precision applications with tight inductance requirements should evaluate the substitute's ±5% tolerance specification against design margins.

Q: What impact does the 950 mOhm DC resistance have compared to 120 mOhm?

A: The higher DC resistance increases power dissipation proportionally to the square of the current. At 320 mA (the substitute's maximum rating), dissipation is approximately 97 mW. At the original part's 820 mA rating, dissipation would exceed 600 mW, which the substitute cannot support. Circuit thermal analysis must account for this increased resistive loss.

Q: Are the physical dimensions compatible for PCB assembly?

A: Yes. Both parts use the 0402 (1005 Metric) surface mount package with identical footprints. The substitute's slightly smaller physical dimensions (1.00 mm × 0.55 mm versus 1.10 mm × 0.60 mm) and lower height (0.60 mm versus 0.70 mm) present no assembly compatibility issues.

Q: Does the ceramic core material affect circuit performance differently than ferrite?

A: Yes. Ceramic and ferrite cores exhibit different frequency response characteristics. The substitute's ceramic core produces a higher self-resonant frequency (1.84 GHz versus 1.3 GHz). In applications sensitive to frequency response, such as wideband RF circuits, this difference may require circuit re-evaluation or tuning adjustments.

Q: Is the substitute suitable for high-temperature applications?

A: The substitute supports operation to 125°C, compared to the original part's 85°C maximum. For applications requiring extended temperature operation, the substitute provides a 40°C advantage. However, the higher DC resistance increases temperature rise due to resistive heating, which must be factored into thermal design calculations.

Q: What is the significance of the different inductance test frequencies?

A: The original part is tested at 100 MHz, while the substitute is tested at 200 MHz. Inductance values can vary with frequency due to core material properties. For applications operating at frequencies significantly different from these test points, actual inductance performance should be verified against the manufacturer's frequency response curves.

Q: Are both parts available in the same packaging format?

A: The original part is supplied in bulk packaging (not specified), while the substitute is supplied in Tape & Reel (TR) format. Both are 0402 (1005 Metric) surface mount components compatible with automated assembly equipment. Packaging format does not affect electrical or mechanical compatibility.