Original Part
Alternative Part
Mixed Signal Translator Unidirectional 1 Circuit 2 Channel 8-SOIC
1. SY100ELT22LZG-TR Substitution Conclusion
As a direct replacement, the SY100ELT22LZG-TR is highly feasible, with one key distinction to note. It shares identical core architecture (unidirectional, 2-channel, mixed-signal translation) and package with the original part MC100ELT22DG. The primary difference lies in the input signal standard: the original part accepts TTL, whereas the substitute is specified for LVTTL. LVTTL features lower voltage thresholds (typically Vih ≥ 2.0V, Vil ≤ 0.8V) compared to standard TTL. The substitute can safely interface with and correctly interpret standard TTL output signals (Voh typically ≥ 2.4V). However, if the upstream driver output in the original system operates near the lower TTL voltage margin or if noise margin is tight, verification is required to ensure the minimum high-level output reliably exceeds the LVTTL Vih threshold. In most 5V system applications, this substitution can be implemented directly.
2. MC100EPT22DG Substitution Conclusion
The MC100EPT22DG is a possible substitute but presents critical electrical compatibility issues; it is generally not recommended as a direct, drop-in replacement without verification. Two differences exist: first, it offers wider input signal compatibility (supporting LVCMOS and LVTTL); second, its output standard changes to LVPECL. The output difference is decisive: the original part provides standard 5V PECL outputs (VCC = 5V, output swing approximately VCC – 1.3V), whereas the MC100EPT22DG delivers 3.3V LVPECL outputs (VCC = 3.3V, output common-mode voltage about VCC – 1.3V). After substitution, the absolute voltage and common-mode voltage of the differential output pair will be significantly lower. If the downstream receiver is designed for 5V PECL levels and bias, this may result in insufficient signal amplitude and common-mode mismatch, preventing proper reception. It is essential to ensure that the subsequent circuitry is compatible with the 3.3V LVPECL standard or to incorporate a level-translation stage.
Analysis ID: 2281-3CBF000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com