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onsemi MC74VHCT08AD
- Part No.:
- MC74VHCT08AD
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- -
- Datasheet:
-
MC74VHCT08AD.pdf
- Description:
- IC GATE AND
- Quantity:
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Inventory:22,825
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Product details
Overview
MC74VHCT08AD from ON Semiconductor is a quad 2-input AND gate in TSSOP-14 package, designed for 4.5 V to 5.5 V operation with 4.3 ns typical propagation delay (VCC = 5 V), TTL-compatible inputs (VIH = 2.0 V, VIL = 0.8 V), and full 5 V CMOS output swing-used in level-shifting logic interfaces between 3.3 V controllers and 5 V peripherals.
For engineers reviewing the MC74VHCT08AD datasheet, pinout, applications, or equivalent options, key selection criteria include its 5 V supply tolerance, input overvoltage resilience up to 7 V, low-noise output (VOLP ≤ 0.8 V), latchup immunity (>300 mA), and Pb-free TSSOP-14 packaging compliant with industrial temperature range (−40°C to +85°C).
Technical Context
The MC74VHCT08AD implements four independent 2-input AND gates using silicon-gate CMOS technology, achieving bipolar-Schottky-TTL speed while maintaining CMOS power efficiency. Its three-stage internal architecture includes buffered outputs for high noise immunity and stable switching.
Input structures tolerate 0 V to 5.5 V regardless of VCC, and output protection remains active even when VCC = 0 V-enabling safe hot-insertion and battery-backup scenarios. Inputs accept TTL logic levels and drive full-rail 5 V CMOS outputs, supporting bidirectional 3.3 V/5 V system interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 4.3 ns typical at VCC = 5 V, CL = 15 pF - enables reliable timing in 100+ MHz digital control paths |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V logic rails and tolerates ±10% regulation variation |
| Input Voltage Thresholds | VIL = 0.8 V max, VIH = 2.0 V min - guarantees robust recognition of TTL-level signals from legacy microcontrollers |
| Output Drive Strength | IOL = 8 mA / IOH = −8 mA at VCC = 4.5 V - sufficient to drive multiple 74-series inputs or small capacitive loads |
| Input Overvoltage Tolerance | Up to 7 V on any input pin - allows direct connection to 5 V buses without external clamping in mixed-voltage systems |
| Quiescent Current | ICC ≤ 2 µA max at TA = 25°C - supports low-power standby modes in battery-backed or energy-sensitive applications |
| ESD Rating | HBM > 2000 V, MM > 200 V - meets industrial handling requirements without additional board-level protection |
Pinout & Package
TSSOP-14 (DT suffix, Case 948G), Pb-free, 5.0 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height - optimized for high-density PCB layouts and automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 9, 10, 12, 13 | Input A1/B1/A2/B2/A3/B3/A4/B4 | Dedicated AND gate inputs; each pair feeds one of four gates; TTL-compatible thresholds enable direct MCU GPIO interfacing |
| 3, 6, 8, 11 | Output Y1/Y2/Y3/Y4 | CMOS rail-to-rail outputs; capable of sourcing/sinking 8 mA; compatible with 5 V logic families and pull-up/pull-down networks |
| 7 | GND | Ground reference for all logic and power domains; must be low-impedance connection to minimize ground bounce |
| 14 | VCC | Primary 4.5–5.5 V supply; decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | Accepts 0.8 V/2.0 V thresholds at 5 V supply - eliminates need for external level shifters when interfacing with legacy 5 V microcontrollers |
| 5 V CMOS Output Swing | VOH ≥ 4.4 V, VOL ≤ 0.1 V at IOL = 50 µA - ensures noise margin > 1.5 V in noisy industrial environments |
| Input Overvoltage Protection | Withstands 7 V input regardless of VCC - enables safe connection to unpowered subsystems or shared-bus architectures |
| Power-Down Input Protection | Inputs remain protected even when VCC = 0 V - prevents damage during hot-swap or partial-power-down sequences |
| Latchup Immunity | Exceeds 300 mA per JEDEC JESD78 - guarantees robustness against transient current injection in motor-drive or relay-control logic |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
|
Use Scenario: Adding discrete logic gating to isolate sensor inputs before ADC sampling in a programmable logic controller rack. IC Role / Device Role / Timing Role: Quad AND gate enabling conditional signal pass-through based on enable flags from FPGA configuration registers. Use Value: 4.3 ns propagation delay ensures synchronization across 4-channel parallel sensor readout; 5 V output swing drives downstream comparators directly. |
Use Scenario: Interfacing 3.3 V CAN controller GPIOs to 5 V lamp driver ICs in a vehicle lighting control unit. IC Role / Device Role / Timing Role: Level-shifting logic buffer converting low-voltage control signals into full 5 V logic levels compatible with high-side switch drivers. Use Value: 7 V input tolerance permits safe operation during battery transients; Pb-free TSSOP-14 meets automotive RoHS and AEC-Q200 assembly requirements. |
| Medical Diagnostic Equipment | Test & Measurement Instrumentation |
|
Use Scenario: Enabling/disabling analog multiplexer channels via microcontroller GPIO in an ECG front-end module. IC Role / Device Role / Timing Role: Logic gate providing synchronized channel selection strobes with precise setup/hold timing relative to ADC clock. Use Value: Balanced tPLH/tPHL delays ensure deterministic timing margins; <2 µA ICC supports battery-operated portable design compliance. |
Use Scenario: Generating synchronized trigger pulses for multi-channel oscilloscope acquisition logic using FPGA outputs. IC Role / Device Role / Timing Role: Glue logic element combining FPGA status bits and external sync signals to produce validated trigger enable signals. Use Value: Low-noise output (VOLP ≤ 0.8 V) prevents false triggering; 300 mA latchup rating withstands ESD events common in lab bench environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input AND gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74VHC08PW | Same VHCT family architecture but VHC (not VHCT) - VIH = 2.0 V only at VCC ≥ 4.5 V; no guaranteed TTL input compatibility below 4.5 V | Less suitable for mixed 3.3 V/5 V systems where input voltage margins are marginal | Select MC74VHCT08AD when interfacing with true TTL sources or requiring guaranteed VIH/VIL across full 4.5–5.5 V range |
| 74LCX08MTCX | Lower VCC range (2.0–3.6 V); 3.3 V only; incompatible with 5 V supply or output swing | Restricted to 3.3 V-only systems; cannot replace MC74VHCT08AD in 5 V logic domains | Choose only if entire system operates at 3.3 V and board layout already uses TSSOP-14 footprint with 3.3 V rail |
Compared with SN74VHC08PW and 74LCX08MTCX, the MC74VHCT08AD uniquely delivers guaranteed TTL input compatibility, 5 V rail-to-rail outputs, and 7 V input overvoltage tolerance - making it the sole option among the three for robust 5 V system interfacing with legacy or mixed-voltage components.
Availability
MC74VHCT08AD is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, medical diagnostic equipment, and test & measurement instrumentation requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for MC74VHCT08AD includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, and communications markets.
The MC74VHCT08AD belongs to the VHCT logic family, engineered specifically for seamless 3.3 V/5 V voltage translation and high-noise-immunity digital interfacing in industrial and automotive control systems.
FAQ
What is the maximum input voltage the MC74VHCT08AD can tolerate?
The MC74VHCT08AD supports DC input voltages from −0.5 V to +7.0 V on any input pin, independent of VCC level. This overvoltage tolerance allows safe connection to powered subsystems while the main logic supply is off, such as during hot-swap or partial-power-down conditions. The MC74VHCT08AD maintains this rating across its full operating temperature range (−40°C to +85°C) and is validated per manufacturer specifications.
Does the MC74VHCT08AD require external pull-up or pull-down resistors on unused inputs?
Yes - unused inputs on the MC74VHCT08AD must be tied to a valid logic level (either VCC or GND) to prevent floating states that could cause excessive current draw or erratic output behavior. The datasheet explicitly states this requirement due to the CMOS input structure. Leaving inputs unconnected violates recommended operating conditions and may compromise reliability. The MC74VHCT08AD does not integrate internal termination resistors.
Is the MC74VHCT08AD pin-compatible with standard 74LS08 or 74HC08 devices?
The MC74VHCT08AD is functionally and pin-compatible with 74LS08 and 74HC08 in the 14-pin SOIC, TSSOP, and SOEIAJ packages - sharing identical pin assignments for inputs, outputs, VCC, and GND. However, unlike 74LS08, the MC74VHCT08AD draws µA-level quiescent current and offers 5 V CMOS output swing. The MC74VHCT08AD also differs from 74HC08 by guaranteeing TTL-compatible input thresholds across its full supply range.
What is the thermal derating specification for the MC74VHCT08AD in TSSOP-14 package?
The MC74VHCT08AD in TSSOP-14 (DT suffix) has a power dissipation limit of 450 mW at TA = 25°C, derated linearly at −6.1 mW/°C above 65°C. At 125°C ambient, maximum allowable power drops to 450 mW − (60 × 6.1) = 84 mW. This derating applies under still-air conditions and assumes proper PCB copper area for heat spreading. The MC74VHCT08AD's low ICC (≤2 µA) minimizes self-heating in static operation.
Can the MC74VHCT08AD operate reliably at VCC = 4.5 V with full AC performance?
Yes - the MC74VHCT08AD is fully specified down to VCC = 4.5 V, including AC parameters: propagation delay remains ≤5.9 ns (tPLH/tPHL, CL = 15 pF), VOH ≥ 4.4 V (IOH = −4 mA), and VOL ≤ 0.44 V (IOL = 4 mA). All DC and AC characteristics in the datasheet are guaranteed across the 4.5 V to 5.5 V range. The MC74VHCT08AD maintains TTL-compatible input thresholds and 7 V input tolerance at minimum VCC.
MC74VHCT08AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Circuits:
- -
- Number of Inputs:
- -
- Features:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Max):
- -
- Current - Output High, Low:
- -
- Input Logic Level - Low:
- -
- Input Logic Level - High:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MC74VHCT08AD FAQ
1.How can I place an order for MC74VHCT08AD through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74VHCT08AD on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC74VHCT08AD reliable?
The price and inventory of MC74VHCT08AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74VHCT08AD is usually 5 days.
3.What payment methods are accepted for MC74VHCT08AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74VHCT08AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74VHCT08AD?
MC74VHCT08AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74VHCT08AD order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC74VHCT08AD?
For technical support, including MC74VHCT08AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74VHCT08AD requirements.
6.How does Aetrix verify that MC74VHCT08AD is sourced from the original manufacturer or authorized distributors?
All MC74VHCT08AD products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC74VHCT08AD meets industry standards.
7.What is the process for return or replacement of MC74VHCT08AD?
All MC74VHCT08AD units undergo pre-shipment inspection (PSI). If there is an issue with MC74VHCT08AD, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC74VHCT08AD part is unused and in its original packaging.
Return procedure for MC74VHCT08AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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