Reference Designs

Domestic replacement, shortage replacement & selection guides — each with application scenario, replacement matrix, core components and BOM notes.

Published by the Sky Century technical team; sources are noted on each detail page. More designs are being added continuously.
Domestic ReplacementRS232Interface IC 2026-08-22

RS232 Transceiver Pin-to-Pin Domestic Replacement

MAX232 / MAX3232 → UMW MAX232ESE / 3PEAK TP3232N-SR — SOP-16 pin-compatible drop-in with ample domestic stock, no board change, significant cost savings (quote for latest volume pricing).

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Shortage ReplacementPower ManagementDC-DC 2026-08-22

TI TPS62913 Shortage Replacement Plan

TI official site confirms TPS62913RPUR OutOfStock (day 12) → Chipown AP65xx/AP66xx redesign (4–8 wks) as priority, TPS62912 (2A pin-to-pin sibling) for emergency, 411 pcs LCSC stock lockable.

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Domestic ReplacementOp-AmpAnalog IC 2026-08-24

ADI/TI Precision & General-Purpose Op-Amp Replacement

OPA2188 / OPA2333 / LM358 / LM324 → RUNIC RS855x / SGMICRO SGM358/SGM324 — high pin-to-pin ratio for zero-drift and general-purpose op-amps, ample domestic stock, lead time <4 weeks, significant cost advantage (quote for latest pricing).

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Domestic ReplacementPower ManagementDC-DC 2026-08-24

TI Power Management IC Replacement Plan

TPS5430 / TPS54331 / TLV1117-33 → Chipown AP65xx/AP61xx, Silergy SY8120, etc. — full DC-DC/LDO coverage, domestic lead 4–8 weeks, significant cost advantage (quote for latest pricing).

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Domestic ReplacementMOSFETIGBT 2026-08-24

Infineon/ST Power Device (MOSFET/IGBT) Replacement Plan

IRF840 / IRFP460 / IKW40N120 → Silan SVF/SGL, CR Micro CRJ, NCE — full high-voltage MOS and IGBT coverage, domestic lead 4–8 weeks, cost advantage 8–14:1 (quote for latest pricing).

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Domestic ReplacementMLCCInductor 2026-08-24

Murata/TDK Passive (MLCC/Inductor/Bead) Replacement Plan

GRM188R71C104KA01D / LQM2HPN1R0MG0L → Fenghua/Sunlord/CCTC — regular MLCC and beads are direct drop-ins with 50–80% savings (quote), domestic lead 1–3 days; lock domestic long-term for high-capacitance parts.

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Domestic ReplacementMCUARM 2026-08-24

ST/NXP MCU Replacement Plan

STM32F103 series / ATmega328P → GigaDevice GD32F103, Geehy APM32F103 — pin-to-pin verified, 6–9:1 price gap (quote for latest pricing), domestic lead 4–8 weeks.

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