MSASU168SB5105KTNA01 Taiyo Yuden MLCC Replacement Guide

MSASU168SB5105KTNA01 Taiyo Yuden MLCC is a 1 uF, 50 V, X5R, 0603 MLCC in Taiyo Yuden's updated part-number system. The confirmed previous part number is UMK107BJ105KA-T, so engineers and buyers should treat the pair as a naming-transition item, not as an unchecked substitute. Use this article to review applications, selection rules, replacement risk and sourcing checks before placing the part into a BOM. Search In-Fortune for MSASU168SB5105KTNA01 or contact In-Fortune for sourcing support.

What is MSASU168SB5105KTNA01?

MSASU168SB5105KTNA01 is a two-terminal surface-mount multilayer ceramic capacitor for compact decoupling, bypass and smoothing positions. Taiyo Yuden lists it as 1 uF, 50 V, X5R, 0603 MLCC with a 0603 / 1608 metric body and reflow soldering. In a design review, the important point is not only the headline capacitance; the dielectric code, voltage rating, temperature range, thickness and old-to-new part-number relationship also affect whether the component is acceptable.

The older code UMK107BJ105KA-T appears in legacy BOMs, distributor systems, AVL files and historical engineering drawings. The newer MSASU168SB5105KTNA01 code is the part number to use when a customer wants the updated Taiyo Yuden naming structure. The electrical intent may be close, but procurement should still confirm the approved part-number wording, document revision and application category before changing a released BOM.

How MSASU168SB5105KTNA01 is used

Typical circuit role

In practical circuit work, MSASU168SB5105KTNA01 is normally placed close to IC supply pins, converter rails, logic domains, display modules, communication modules or secondary-side smoothing nodes. The capacitor provides a local low-impedance path for high-frequency current, reduces rail movement during load transitions and helps keep sensitive signal or clock domains stable. Because it is non-polarized, the pinout question is mainly a land-pattern and assembly question rather than a positive/negative orientation issue.

Designers should place the capacitor with short traces to the supply and return nodes, use a ground plane or low-inductance return path where possible, and avoid routing the part through long thin traces that cancel the value of a small MLCC. For converter outputs or input bypass banks, the real capacitance under DC bias can be lower than the nominal value, especially for high-K dielectric parts. Check the Taiyo Yuden characteristic data and validate the final rail ripple or transient response on the real PCB.

Layout and process notes

The 0603 / 1608 metric size makes MSASU168SB5105KTNA01 suitable for dense boards, but small MLCCs are still sensitive to solder-joint stress and board flex. Keep the land pattern aligned with the manufacturer drawing, avoid placing the capacitor across high-bend areas, and review the reflow profile for the board stack and nearby thermal mass. If this part is used in a high-reliability device, confirm whether the general-purpose version is acceptable or whether a different Taiyo Yuden application category is required.

Key specifications for MSASU168SB5105KTNA01

MSASU168SB5105KTNA01 selection guide

Select MSASU168SB5105KTNA01 when the design requires 1 uF nominal capacitance, 50 V rating, X5R dielectric behavior and the 0603 / 1608 metric footprint. It is a practical candidate for bypass, decoupling and local smoothing where the applied voltage, ripple current, board temperature and mechanical environment stay inside the reviewed limits. For a legacy drawing that still calls out UMK107BJ105KA-T, the new number can simplify sourcing communication, but only after engineering and procurement agree on the naming transition.

Do not choose the part only because the nominal capacitance is the same as another MLCC. A 1 uF or 2.2 uF capacitor can behave very differently after voltage bias, temperature change and aging. If the circuit depends on minimum effective capacitance, run the calculation with derating margin. If the rail is near the rated voltage, consider a higher voltage class. If the operating temperature exceeds the listed range, review a higher temperature dielectric or a different product category. If the PCB footprint is already frozen, do not change body size or thickness without assembly review.

For replacement work, the decision path should be explicit: confirm the old part number, confirm MSASU168SB5105KTNA01 as the intended new number, compare the datasheet and characteristic curves, then validate the circuit and production documents. A naming transition is easier to approve than a functional substitute, but it still belongs in the change-control record.

Alternatives and cross references for MSASU168SB5105KTNA01

Possible alternatives can support sourcing discussions, but none should be treated as automatically interchangeable. Before approving a replacement for MSASU168SB5105KTNA01, compare capacitance, voltage rating, dielectric, temperature range, DC-bias curve, package, thickness, land pattern, soldering requirements, lifecycle status, qualification category and customer approval requirements.

Buying notes and sourcing checks

Before issuing an RFQ for MSASU168SB5105KTNA01, confirm the complete Taiyo Yuden part number, the previous number UMK107BJ105KA-T, the customer AVL entry, package size, reel or cut handling requirement, date-code requirement, batch consistency requirement, original factory condition, documentation request and delivery schedule. If the purchasing request comes from an older BOM, include both the previous and new part number so sales can check the transition without guessing.

Contact In-Fortune to confirm MSASU168SB5105KTNA01 specifications and sourcing path. Send an RFQ with your required quantity, target delivery schedule, accepted substitute range and whether the old part number UMK107BJ105KA-T is still allowed by your engineering team. If your build requires RoHS, REACH, halogen-free, customer-specific approval, PPAP-like files or restricted-use review, list those requirements before the quote process starts.

MSASU168SB5105KTNA01 FAQ

Where can I find the MSASU168SB5105KTNA01 datasheet?

Start with the Taiyo Yuden TY-COMPAS product page for MSASU168SB5105KTNA01 and request the latest supplier documentation when preparing a released BOM.

Is UMK107BJ105KA-T the same as MSASU168SB5105KTNA01?

Taiyo Yuden identifies UMK107BJ105KA-T as the previous part number for MSASU168SB5105KTNA01. Treat it as a confirmed part-number transition, but still check the drawing, suffix and customer approval before changing a BOM.

What is the MSASU168SB5105KTNA01 pinout?

As a two-terminal MLCC, the part is non-polarized. The practical pinout check is the pad geometry, terminations, solder fillet and land-pattern match to the 0603 / 1608 metric package.

What applications fit MSASU168SB5105KTNA01?

Typical uses include IC bypassing, local decoupling, power-rail smoothing, converter input or output support and compact signal-board supply filtering.

Can I replace another 0603 capacitor with MSASU168SB5105KTNA01?

Only after checking capacitance, voltage, dielectric, DC bias, temperature range, thickness, land pattern and approval status. Same case size alone is not enough.

What should procurement confirm before buying MSASU168SB5105KTNA01?

Confirm the full new part number, previous part number, Taiyo Yuden brand, packaging, date code, batch requirements, documentation, delivery schedule and accepted substitute range.

Does In-Fortune have an exact product detail page for MSASU168SB5105KTNA01?

No exact In-Fortune product detail URL was found in the checked local product-link index at the time of this article. Use the In-Fortune model search or RFQ page, and replace the search link with an exact product detail link once it is available.

Related internal links

• Search In-Fortune for MSASU168SB5105KTNA01
• Search In-Fortune for previous part number UMK107BJ105KA-T
• Taiyo Yuden manufacturer page on In-Fortune
• Ceramic capacitor and electronic component product search
• Request sourcing support from In-Fortune
• MSASE168SB5225KTNA01 / EMK107BJ225KA-T - 2.2 uF, 16 V, X5R, JIS B, 0603 MLCC
• MSASE168SB7105KTNA01 / EMK107B7105KA-T - 1 uF, 16 V, X7R, 0603 MLCC
• MSAST168SB7105KTNA01 / TMK107B7105KA-T - 1 uF, 25 V, X7R, 0603 MLCC

Missing or uncertain data

• Exact In-Fortune product detail page for MSASU168SB5105KTNA01: to be confirmed with supplier or site product-data team.
• Customer-specific acceptance of replacing UMK107BJ105KA-T with MSASU168SB5105KTNA01: to be confirmed with engineering and procurement.
• Latest production document package, batch requirement and delivery schedule: to be confirmed with supplier.
• Final compliance documents required by the end product: to be confirmed with supplier.