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onsemi 74VHCT08ASJ
- Part No.:
- 74VHCT08ASJ
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74VHCT08ASJ.pdf
- Description:
- IC GATE AND 4CH 2-INP 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,531
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Product details
Overview
74VHCT08ASJ from Fairchild Semiconductor is a quad 2-input AND gate logic IC in EIAJ TYPE II SOP package, operating at 4.5–5.5V supply, with 5.0ns typical propagation delay, ±25mA output drive, and guaranteed 2.0V VIH / 0.8V VIL input thresholds for TTL-compatible interfacing in mixed-voltage digital systems.
For engineers reviewing the 74VHCT08ASJ datasheet, pinout, applications, or equivalent options, this device serves as a high-noise-immunity, low-power CMOS replacement for 74HCT08 in 5V control logic, bus gating, and level-shifting between 3V/5V domains where power-down protection and input overvoltage tolerance to 7V are required.
Technical Context
The 74VHCT08ASJ implements four independent AND gates using silicon-gate CMOS technology, achieving bipolar-equivalent speed while maintaining CMOS quiescent current (2µA max). Its internal buffer-output stage enhances noise immunity and output stability across temperature (–40°C to +85°C) and supply variation (4.5V–5.5V).
Input and output protection circuits allow safe application of 0V–7V signals regardless of VCC state-including VCC = 0V-enabling robust interfacing in battery-backup systems and hot-swap scenarios. All unused inputs must be tied HIGH or LOW per design specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Quad 2-input AND gate; each gate outputs HIGH only when both inputs are HIGH |
| Propagation Delay (tPD) | 5.0ns typical at VCC = 5.0V, CL = 15pF - enables reliable operation up to ~100MHz toggle rates in clean signal paths |
| Supply Voltage Range | 4.5V to 5.5V - compatible with standard 5V TTL/CMOS rails; not rated for 3.3V-only operation |
| Input Thresholds | VIH = 2.0V min, VIL = 0.8V max - ensures direct compatibility with 5V TTL outputs and noise margin >0.4V |
| Output Drive | ±25mA DC output current - supports driving multiple 74-series inputs or small LEDs without external buffers |
| Quiescent ICC | 2µA max at TA = 25°C - enables ultra-low static power in always-on control logic sections |
| Input Overvoltage Tolerance | –0.5V to +7.0V on inputs regardless of VCC - permits safe connection to unpowered or higher-voltage subsystems |
Pinout & Package
EIAJ TYPE II 14-lead Small Outline Package (SOP), 5.3mm body width, gull-wing leads, JEDEC-compliant footprint (M14D). RoHS-compliant, lead-free per J-STD-020B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 12, 13 | Input (A1/B1/A2/B2/A3/B3/A4/B4) | Four independent AND gate inputs; each pair (e.g., Pin 1 & 2) feeds one gate |
| 3, 6, 10, 11 | Output (Y1/Y2/Y3/Y4) | Respective AND gate outputs; push-pull CMOS structure, rail-to-rail swing |
| 7 | GND | Ground reference for all logic and power domains; mandatory connection for operation |
| 14 | VCC | Positive supply (4.5–5.5V); powers all four gates and internal protection circuitry |
Key Features
| Feature | Design Value |
|---|---|
| High-speed CMOS AND logic | 5.0ns typical propagation delay matches 74HCT performance while cutting static power by >90% vs. bipolar TTL |
| TTL-compatible input thresholds | 2.0V VIH / 0.8V VIL enables direct replacement of 74LS/74HCT parts without level-shifter redesign |
| Power-down input/output protection | Inputs and outputs tolerate –0.5V to +7.0V even with VCC = 0V - prevents latch-up or damage during power sequencing |
| Low dynamic noise | VOLP ≤ 0.8V (max) at CL = 50pF - reduces ground bounce and crosstalk in dense PCB layouts |
| PIN- and FUNCTION-compatible with 74HCT08 | Identical pinout and truth table - allows drop-in substitution in existing 74HCT08 designs with no layout change |
Applications
| Industrial Control Logic | Microcontroller Peripheral Gating |
|---|---|
|
Use Scenario: Enabling/disabling sensor readout channels based on system mode in programmable logic controllers. IC Role / Device Role / Timing Role: Quad AND gate performing synchronous enable logic for analog multiplexers and ADC sample clocks. Use Value: Ensures precise timing alignment between microcontroller GPIO and analog front-end sampling, with 5ns delay adding negligible skew. |
Use Scenario: Controlling access to shared I²C or SPI buses among multiple peripherals in embedded gateways. IC Role / Device Role / Timing Role: Bus arbitration gate that masks peripheral addresses until master grants access. Use Value: Prevents bus contention with deterministic, glitch-free gating-no metastability risk due to CMOS input hysteresis. |
| 5V/3V Level Translation | Power Sequencing Supervision |
|
Use Scenario: Interfacing 3.3V FPGA I/O banks to legacy 5V peripheral modules in industrial HMIs. IC Role / Device Role / Timing Role: Unidirectional voltage-tolerant logic gate translating 3.3V control signals to 5V domain. Use Value: Eliminates need for discrete level-shifters; 7V-tolerant inputs accept 3.3V logic safely while driving full 5V outputs. |
Use Scenario: Validating power rail readiness before releasing reset to microcontrollers in medical diagnostic equipment. IC Role / Device Role / Timing Role: AND gate combining multiple POK (power-ok) signals from DC/DC converters into single system-ready flag. Use Value: Guarantees all critical rails are stable prior to boot; 2µA quiescent current avoids loading sensitive monitoring circuits. |
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 |
|---|---|---|---|
| 74HCT08N | PDIP package (N14A), same electrical specs but larger footprint and lower thermal performance | Suitable for prototyping or through-hole assembly; not recommended for space-constrained or reflow-soldered production | Select when manual soldering, breadboarding, or legacy board compatibility is required |
| SN74HCT08DR | TSSOP-14 (JEDEC MO-153), identical logic and AC specs; slightly higher ICC (4µA max) and different land pattern | Better thermal dissipation and smaller PCB area than SOP; requires updated stencil and placement file | Select for high-density automated assembly where thermal margin and miniaturization outweigh requalification effort |
Compared with 74VHCT08ASJ, the 74HCT08N offers identical logic behavior in through-hole form but lacks the 7V input tolerance and tighter VOLP spec; SN74HCT08DR delivers equivalent functionality in a thermally superior TSSOP package but requires layout revision and has marginally higher static current.
Availability
74VHCT08ASJ is available at Aetrix Electronics and suitable for industrial control logic, microcontroller peripheral gating, and 5V/3V level translation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 74VHCT08ASJ 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 power semiconductors, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and automotive systems.
The 74VHCT08ASJ belongs to the VHCT (Very High-Speed CMOS TTL-compatible) family, engineered to replace bipolar TTL in 5V systems while delivering CMOS power efficiency, robustness, and mixed-voltage interoperability.
FAQ
What is the maximum operating temperature range for the 74VHCT08ASJ?
The 74VHCT08ASJ is rated for continuous operation from –40°C to +85°C under recommended conditions. This range is validated per the datasheet's Recommended Operating Conditions table and applies to all electrical specifications including propagation delay, output drive, and input thresholds. Operation outside this range may cause timing violations or increased leakage.
Can the 74VHCT08ASJ operate with a 3.3V supply voltage?
No, the 74VHCT08ASJ is not specified for 3.3V operation. Its Recommended Operating Conditions require VCC = 4.5V to 5.5V. At 3.3V, input thresholds (VIH = 2.0V) would exceed 60% of VCC, risking unreliable HIGH detection; output swing would also fall below TTL-compatible levels. Use 74LVC08 or similar for 3.3V systems.
Does the 74VHCT08ASJ support hot-swap or live-insertion?
Yes-the 74VHCT08ASJ includes built-in protection circuits allowing inputs and outputs to tolerate –0.5V to +7.0V regardless of VCC state, including VCC = 0V. This enables safe insertion into powered backplanes or connection to unpowered subsystems without damaging the device or disturbing other circuitry.
Is the 74VHCT08ASJ pin-compatible with the 74HCT08 series?
Yes, the 74VHCT08ASJ is explicitly stated as pin and function compatible with the 74HCT08. The pinout (14-pin SOP), logic function, truth table, and terminal assignments match identically-making it a direct drop-in replacement in existing 74HCT08 designs without PCB or firmware changes.
What is the purpose of the power-down protection feature in the 74VHCT08ASJ?
The power-down protection in the 74VHCT08ASJ prevents damage when inputs or outputs are driven while VCC = 0V. Internal clamping diodes and isolation structures ensure signals from active subsystems (e.g., battery backup or hot-swap modules) cannot force current through the unpowered IC, avoiding latch-up or junction breakdown-critical in fault-tolerant industrial systems.
74VHCT08ASJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHCT
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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-SOP
74VHCT08ASJ FAQ
1.How can I place an order for 74VHCT08ASJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT08ASJ 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 74VHCT08ASJ reliable?
The price and inventory of 74VHCT08ASJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT08ASJ is usually 5 days.
3.What payment methods are accepted for 74VHCT08ASJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT08ASJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT08ASJ?
74VHCT08ASJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT08ASJ 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 74VHCT08ASJ?
For technical support, including 74VHCT08ASJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT08ASJ requirements.
6.How does Aetrix verify that 74VHCT08ASJ is sourced from the original manufacturer or authorized distributors?
All 74VHCT08ASJ 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 74VHCT08ASJ meets industry standards.
7.What is the process for return or replacement of 74VHCT08ASJ?
All 74VHCT08ASJ units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT08ASJ, 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 74VHCT08ASJ part is unused and in its original packaging.
Return procedure for 74VHCT08ASJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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