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MC74VHC1GT125DF2G

Single 3-state buffer, VHC, 2-5.5V, TTL inputs, active-low OE, 3.5ns@5V, OVT, Ioff, SC-88A

5000

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MC74VHC1GT125DF2G

الحزمة ： الحزمة

SC-88A / SC-70-5 / SOT-353 (2.0 x 1.25 x 0.9mm)

الوصف

نظرة عامة على المنتج

The MC74VHC1GT125DF2G is a single non-inverting 3-state buffer from onsemi with TTL-compatible input thresholds (T suffix). The 3-state output enables bus sharing and signal isolation, while the 7V-tolerant inputs and Ioff circuitry support level translation and hot insertion. With 3.5ns propagation delay, ±8mA output drive, and SC-88A (SC-70-5) packaging, it is ideal for bus buffering and voltage translation in space-constrained designs.

المواصفات الرئيسية

Logic Function	Single Non-Inverting 3-State Buffer
جهد الإمداد	2.0V to 5.5V
Input Threshold	TTL-compatible (T suffix)
تأخير الانتشار	3.5ns typ @ 5V
Output Drive	±8mA @ 3V; ±8mA @ 4.5V
نوع الإخراج	3-State (OE active-low enables output)
Input Voltage Tolerance	Up to 5.5V (overvoltage tolerant)
دعم Ioff	Yes (partial power-down protection)
تيار التهدئة	1µA max @ 25°C
3-State Leakage	±0.25µA max @ 25°C
ESD Protection	2000V HBM, 1000V CDM
الحزمة	SC-88A / SC-70-5 / SOT-353 (2.0 x 1.25mm)
درجة حرارة التشغيل	-55 درجة مئوية إلى +125 درجة مئوية

الميزات

Single non-inverting 3-state buffer with active-low OE
TTL-compatible input thresholds (T suffix)
3.5ns propagation delay at 5V
5.5V-tolerant inputs for level translation
Ioff supports partial power-down and hot insertion
±8mA output drive at 3V
3-state output for bus sharing
1µA max quiescent current
Available in SC-88A, SC-74A, TSOP-5, SOT-953, UDFN6
Pb-free, halogen-free, RoHS compliant

التطبيقات

Bus buffer with enable control
3-state bus sharing and multiplexing
Level translation with output isolation
Hot insertion signal buffering
GPIO expansion with tri-state control

مقدمة المنتج:MC74VHC1GT125DF2G مقدمة المنتج

The MC74VHC1GT125DF2G from onsemi is a single non-inverting 3-state buffer with TTL-compatible input thresholds. The device passes the input signal to the output (Y = A) when the output enable (OE) pin is low, and enters a high-impedance state when OE is high. The T suffix provides TTL-compatible input thresholds (VIH ≈ 1.4V at 3V VCC), enabling interface with bipolar TTL devices. The VHC technology delivers 3.5ns propagation delay at 5V — matching Schottky TTL speed — while consuming only 1µA quiescent current. The 5.5V-tolerant inputs accept signals from higher-voltage domains, and the Ioff circuitry ensures the output goes high-impedance when VCC is removed, supporting hot insertion and partial power-down scenarios. The DF2 suffix indicates SC-88A (SC-70-5) tape-and-reel packaging in a tiny 2.0 x 1.25mm footprint.

مبدأ العمل:MC74VHC1GT125DF2G مبدأ العمل

The MC74VHC1GT125DF2G combines a non-inverting buffer with a 3-state output stage controlled by the active-low OE pin. When OE is low, the buffer is active and Y = A — the input signal passes through to the output. When OE is high, both the PMOS pull-up and NMOS pull-down transistors in the output stage are turned off, placing the output in a high-impedance (Hi-Z) state. This allows multiple devices to share a common bus without contention. The T suffix input stage has TTL-compatible switching thresholds, accepting TTL logic levels (VIH ≥ 2.0V, VIL ≤ 0.8V at 4.5V VCC) while producing full CMOS output swings. The input protection circuitry tolerates voltages up to 5.5V regardless of VCC, enabling down-translation from 5V to 3.3V domains. The Ioff circuit extends the high-impedance behavior to the VCC=0V condition, preventing current from flowing from the input or bus back through the device during power-off.

وصف الدبوس:MC74VHC1GT125DF2G تعريف الدبوس ووظائفه

دبوس	الاسم	الوصف
1	OE	Output enable (active low; high = Hi-Z)
2	A	Data input (TTL thresholds)
3	GND	أرضي
4	Y	Data output (3-state; Y = A when OE low)
5	VCC	Supply voltage (2.0V to 5.5V)

Application Scenarios:In which products and applications isMC74VHC1GT125DF2G مستعمل

Shared Bus Isolation: Connect multiple peripherals to a shared data bus through MC74VHC1GT125DF2G buffers. Only one peripheral’s OE is asserted low at a time; all others are high-impedance. The MCU controls which peripheral drives the bus by managing the OE pins. The TTL-compatible inputs accept signals from legacy 5V TTL peripherals while the output swings 0 to 3.3V for the modern CMOS bus.
Level Translation with Bus Isolation: Translate a 5V bus signal to a 3.3V domain while adding a 3-state enable. The 5.5V-tolerant input safely accepts the 5V signal; the output swings 0 to 3.3V. The OE pin allows the MCU to disconnect the translator from the 3.3V bus when not needed, reducing power consumption and bus loading.
Hot-Swap Signal Protection: Use on a plug-in card where the signal must be isolated from the backplane during insertion and removal. When the card is not powered, Ioff ensures the output is Hi-Z regardless of OE state. Once VCC ramps up, the system controller asserts OE low to connect the signal. This prevents bus contention and current backflow during hot-swap events.

Alternative Models:What chips are recommended as replacements for MC74VHC1GT125DF2G

الطراز	VCC	المدخلات	الفرق الرئيسي
MC74VHC1G125DF2G	2-5.5V	CMOS	CMOS thresholds (no T)
SN74LVC1G125DCKR	1.65-5.5V	CMOS	TI LVC, similar 3-state buffer
NC7NZ125P5X	1.65-5.5V	CMOS	Renesas, similar 3-state
74AUP1G125GF	0.8-3.6V	CMOS	Nexperia, ultra-low power