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onsemi 74VHCT08AMX
- Part No.:
- 74VHCT08AMX
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74VHCT08AMX.pdf
- Description:
- IC GATE AND 4CH 2-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,725
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Product details
Overview
74VHCT08AMX from Fairchild Semiconductor is a quad 2-input AND gate IC in 14-lead SOIC package, operating at 4.5–5.5V supply, with 5.0ns typical propagation delay, ±25mA output drive, and TTL-compatible input thresholds (VIH = 2.0V, VIL = 0.8V). It enables logic-level translation between 3V and 5V systems in industrial control and digital interface circuits.
For engineers reviewing the 74VHCT08AMX datasheet, pinout, applications, or equivalent options, key selection criteria include its power-down protection, low ICC (2µA max), noise immunity (VOLP ≤ 0.8V), and compatibility with 74HCT08-based designs requiring stable 5V logic operation.
Technical Context
The 74VHCT08AMX implements four independent AND gates using silicon-gate CMOS technology, achieving bipolar-Schottky TTL speed while retaining CMOS power efficiency. Its internal buffer-output stage ensures high noise immunity and stable switching across temperature.
Input and output protection circuits allow safe application of 0–7V signals regardless of VCC state - enabling robust interfacing in mixed-supply or battery-backup systems. Unused inputs must be tied HIGH or LOW per design specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - Ensures compatibility with standard 5V logic rails and tolerance for supply variation. |
| Propagation Delay | 5.0ns (typ.) at VCC = 5.0V, CL = 15pF - Enables reliable operation in high-speed digital timing paths up to ~100MHz. |
| Input Thresholds | VIH = 2.0V, VIL = 0.8V - Guarantees TTL-level signal recognition without level-shifting circuitry. |
| Output Drive | ±25mA - Supports direct driving of multiple 74-series inputs or moderate capacitive loads. |
| Quiescent Current | ICC ≤ 2µA at TA = 25°C - Minimizes standby power in battery-sensitive or always-on logic subsystems. |
| Operating Temperature | –40°C to +85°C - Validated for use in industrial-grade embedded controllers and automation equipment. |
Pinout & Package
74VHCT08AMX is housed in a 14-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-012, 0.150" narrow body, with 0.65mm lead pitch and surface-mount land pattern SOP65P600X145-14M.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 12, 13 | Input (A1/B1/A2/B2/A3/B3/A4/B4) | Eight total inputs grouped as four independent AND gate pairs; each pair accepts TTL-compatible logic levels. |
| 3, 6, 10, 11 | Output (Y1/Y2/Y3/Y4) | Four buffered CMOS outputs capable of sourcing/sinking ±25mA with rail-to-rail swing under load. |
| 7 | GND | Ground reference for all logic and power domains; must be connected to system common ground plane. |
| 14 | VCC | Positive supply terminal; decoupling capacitor (0.1µF ceramic) required within 10mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Power-down protection | Inputs and outputs tolerate 0–7V regardless of VCC state - prevents latch-up or damage during hot-insertion or supply sequencing. |
| TTL-compatible input thresholds | VIH = 2.0V / VIL = 0.8V enables direct connection to legacy 5V TTL outputs without external biasing. |
| Low dynamic noise | VOLP ≤ 0.8V (max) at CL = 50pF reduces crosstalk and false triggering in dense PCB layouts. |
| Pin/function compatibility | Direct replacement for 74HCT08 in existing designs - same pinout, truth table, and AC/DC characteristics. |
Applications
| Industrial PLC I/O Modules | Digital Signal Routing |
|---|---|
Use Scenario: Combining status signals from multiple sensors before feeding into a microcontroller interrupt line. IC Role / Device Role / Timing Role: Logic-level gating of parallel sensor flags into a single enable path with deterministic propagation delay. Use Value: Eliminates need for software polling by enabling hardware-level signal aggregation with sub-6ns timing precision. |
Use Scenario: Enabling/disabling data paths between FPGA and peripheral ICs based on mode-select control lines. IC Role / Device Role / Timing Role: Synchronous bus gating element ensuring clean signal isolation during state transitions. Use Value: Prevents metastability and bus contention via guaranteed setup/hold compliance and rail-rail output swing. |
| 3V/5V Level Translation | Power Sequencing Control |
Use Scenario: Interfacing a 3.3V microcontroller GPIO to a 5V display driver requiring TTL-high activation. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant logic translator with no external resistors or direction control. Use Value: Achieves level shift using only VCC = 5V supply while accepting 3.3V inputs - simplifies BOM and layout. |
Use Scenario: Controlling power-enable signals to downstream regulators based on master system reset assertion. IC Role / Device Role / Timing Role: Glue logic element that combines reset and enable signals to generate sequenced power-on strobes. Use Value: Provides deterministic startup order with built-in noise immunity - avoids brown-out induced lockup. |
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 |
|---|---|---|---|
| 74HCT08D,118 (Nexperia) | Same pinout and DC specs; tPD = 6.0ns (typ.) at CL = 50pF - slightly slower than 74VHCT08AMX's 5.5ns. | Valid for cost-sensitive consumer designs where <1ns delay margin is acceptable. | Select when prioritizing broad distributor availability over minimal propagation delay. |
| SN74HCT08DR (Texas Instruments) | Identical logic function and pinout; ICC = 2µA (max) matches, but VOLP not specified - lacks published dynamic noise data. | Suitable for general-purpose 5V logic where noise characterization is secondary to qualification history. | Prefer for automotive-qualified designs requiring AEC-Q100 documentation and long-term supply assurance. |
Compared with 74VHCT08AMX, the Nexperia 74HCT08D offers broader global stock but trades 0.5ns speed; TI's SN74HCT08DR provides stronger automotive pedigree but omits dynamic noise specs - making 74VHCT08AMX optimal for noise-critical industrial timing paths requiring verified VOLP ≤ 0.8V.
Availability
74VHCT08AMX is available at Aetrix Electronics and suitable for industrial PLCs, digital instrumentation, 3V/5V interface modules, and power management sequencers requiring stable component supply and full traceability.
Supply support for 74VHCT08AMX 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
Fairchild Semiconductor was a leading designer of high-performance analog and discrete semiconductors, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and automotive systems.
The 74VHCT08AMX belongs to Fairchild's VHCT (Very High Speed CMOS TTL-compatible) family, engineered specifically for high-noise industrial environments requiring fast, low-power, mixed-voltage logic interfacing without external level shifters.
FAQ
What is the maximum recommended supply voltage for the 74VHCT08AMX?
The 74VHCT08AMX supports a supply voltage range of 4.5V to 5.5V under normal operation. Its absolute maximum rating allows VCC up to +7.0V, but sustained operation above 5.5V violates recommended conditions and may compromise reliability or timing performance. Always operate the 74VHCT08AMX within 4.5–5.5V for guaranteed compliance with propagation delay, noise immunity, and output drive specs.
Does the 74VHCT08AMX require pull-up or pull-down resistors on unused inputs?
Yes - unused inputs on the 74VHCT08AMX must be held HIGH or LOW; floating inputs are prohibited. The datasheet explicitly states this in the Recommended Operating Conditions table. Leaving an input unconnected risks increased ICC, erratic output behavior, or localized heating due to intermediate voltage states. For robust design, tie each unused A/B input directly to VCC or GND - no resistor needed unless current limiting is required for fault tolerance.
Is the 74VHCT08AMX pin-compatible with standard 74HCT08 devices?
Yes, the 74VHCT08AMX is pin and function compatible with the 74HCT08 family. It shares identical pin assignments, truth table, and DC/AC electrical characteristics - including VIH/VIL thresholds, output drive capability, and propagation delay profile. This compatibility allows drop-in replacement in existing 74HCT08-based PCB layouts without modification, provided the SOIC package footprint matches.
What is the purpose of power-down protection in the 74VHCT08AMX?
Power-down protection in the 74VHCT08AMX ensures that inputs and outputs tolerate voltages from 0V to 7V even when VCC = 0V. This prevents device damage during hot-plug events, supply sequencing mismatches, or battery-backup transitions. For example, if a 5V signal arrives at an input while VCC is off, the internal protection diodes safely clamp the voltage - a critical feature for the 74VHCT08AMX in systems with asynchronous power domains.
Can the 74VHCT08AMX drive a 50pF capacitive load reliably?
Yes - the 74VHCT08AMX is characterized for CL = 50pF in its AC Electrical Characteristics table, specifying tPLH/tPHL = 5.5ns (typ.) and VOLP ≤ 0.8V under those conditions. Its ±25mA output drive strength and buffered output stage ensure stable edge rates and minimal overshoot into 50pF loads, making the 74VHCT08AMX suitable for driving moderate-length PCB traces or multiple fanout destinations without external buffering.
74VHCT08AMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- AND Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Max):
- 2 µA
- Current - Output High, Low:
- 8mA, 8mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 7.9ns @ 5V, 50pF
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
74VHCT08AMX FAQ
1.How can I place an order for 74VHCT08AMX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT08AMX 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 74VHCT08AMX reliable?
The price and inventory of 74VHCT08AMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT08AMX is usually 5 days.
3.What payment methods are accepted for 74VHCT08AMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT08AMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT08AMX?
74VHCT08AMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT08AMX 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 74VHCT08AMX?
For technical support, including 74VHCT08AMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT08AMX requirements.
6.How does Aetrix verify that 74VHCT08AMX is sourced from the original manufacturer or authorized distributors?
All 74VHCT08AMX 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 74VHCT08AMX meets industry standards.
7.What is the process for return or replacement of 74VHCT08AMX?
All 74VHCT08AMX units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT08AMX, 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 74VHCT08AMX part is unused and in its original packaging.
Return procedure for 74VHCT08AMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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