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onsemi 74VHCT08AM
- Part No.:
- 74VHCT08AM
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74VHCT08AM.pdf
- Description:
- IC GATE AND 4CH 2-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,608
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Product details
Overview
74VHCT08AM from Fairchild Semiconductor is a quad 2-input AND gate IC in SOIC-14 package, operating at 4.5–5.5 V supply, with 5.0 ns typical propagation delay, ±25 mA output drive, and TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V). It enables logic-level translation between 3V and 5V systems in industrial control interfaces.
For engineers reviewing the 74VHCT08AM datasheet, pinout, applications, or equivalent options, key selection criteria include its power-down protection on all I/O, 2 µA max quiescent ICC at 25°C, noise immunity (VOLP ≤ 0.8 V), and compatibility with 74HCT08-based designs.
Technical Context
The 74VHCT08AM implements four independent AND gates using silicon-gate CMOS technology, achieving bipolar-Schottky TTL speed while retaining CMOS low-power operation. Its 4-stage internal circuit includes buffered outputs for stable switching and high noise margin.
Input and output protection circuits allow safe application of 0–7 V signals regardless of VCC state-including VCC = 0 V-enabling robust interfacing in mixed-supply and battery-backup systems without external clamping diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across standard 5 V rail tolerances. |
| Propagation Delay | 5.0 ns (typ.) at VCC = 5.0 V, CL = 15 pF - Supports >100 MHz toggle rates in combinatorial logic paths. |
| Output Drive | ±25 mA - Sufficient to directly drive multiple 74-series inputs or small LEDs without buffering. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - Guarantees reliable recognition of TTL-level signals in mixed-voltage systems. |
| Quiescent ICC | 2 µA (max.) at TA = 25°C - Enables ultra-low static power in always-on monitoring circuits. |
| Operating Temp | –40°C to +85°C - Qualified for industrial ambient environments without derating. |
Pinout & Package
74VHCT08AM is housed in a 14-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-012, 0.150" narrow body, with 1.27 mm lead pitch and gull-wing surface-mount terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 12, 13 | Gate Inputs (A1/B1, A2/B2, A3/B3, A4/B4) | Four independent 2-input AND gate inputs; each pair drives one output. |
| 3, 6, 10, 11 | Gate Outputs (Y1–Y4) | Active-high CMOS outputs with rail-to-rail swing and ±25 mA sink/source capability. |
| 7 | GND | Ground reference for all logic and power domains; must be low-impedance. |
| 14 | VCC | Positive supply terminal; decoupling capacitor required within 1 cm for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Power-down protection | All inputs and outputs tolerate 0–7 V regardless of VCC state, enabling hot-swap and battery-backup use without latch-up risk. |
| Low dynamic noise | VOLP ≤ 0.8 V ensures minimal ground bounce during simultaneous switching of multiple outputs. |
| TTL-input compatibility | VIH/VIL thresholds match legacy TTL logic, allowing direct replacement in 74HCT08 designs without level-shifting. |
| High noise immunity | Input hysteresis and buffered output stages suppress false triggering from EMI or crosstalk in noisy industrial PCBs. |
Applications
| Industrial PLC I/O Expansion | Legacy System Logic Interface |
|---|---|
Use Scenario: Adding discrete logic gating to digital input modules in programmable logic controllers where field sensors feed 5 V TTL signals into microcontroller GPIOs. IC Role / Device Role / Timing Role: Quad AND gate performing signal enable/valid masking before data capture, with no timing-critical path. Use Value: Eliminates need for software-based gating, reduces MCU interrupt load, and provides hardware-level signal validation before firmware processing. | Use Scenario: Interfacing new 3.3 V microcontrollers with existing 5 V peripheral buses (e.g., parallel LCD drivers or EEPROM address latches). IC Role / Device Role / Timing Role: Level-translating AND gate enabling bidirectional handshake signaling between voltage domains. Use Value: Maintains full 5 V logic swing integrity on the peripheral side while accepting 3.3 V–compatible input thresholds, avoiding external resistive dividers or dedicated translators. |
| Battery-Backed Real-Time Clock Control | Automated Test Equipment Signal Gating |
Use Scenario: Enabling RTC alarm outputs only when system power is present and backup battery voltage exceeds threshold. IC Role / Device Role / Timing Role: Dual-input AND gate combining RTC interrupt and main power-good signal to gate wake-up pulses. Use Value: Prevents spurious wake-ups during brown-out or battery-swapping events due to input protection tolerating VCC = 0 V while inputs remain active. | Use Scenario: Controlling stimulus delivery to DUTs in automated test fixtures where pattern generator outputs must be gated by safety interlock signals. IC Role / Device Role / Timing Role: Hardware-enforced AND gate ensuring test signals are blocked unless all mechanical guards and thermal sensors report safe status. Use Value: Provides fail-safe, zero-latency signal blocking independent of host controller firmware, meeting functional safety requirements for Class I equipment. |
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-14 package; identical electrical specs but lacks power-down protection on inputs/outputs. | Not suitable for hot-swap or VCC = 0 V interface scenarios; limited to fixed 5 V systems. | Select when board space allows through-hole mounting and system architecture guarantees synchronized power sequencing. |
| SN74VHCT08APW | TSSOP-14 package (JEDEC MO-153); same VHCT family specs, including power-down protection and noise characteristics. | Smaller footprint and finer pitch; requires rework-capable SMT process and tighter layout controls. | Select for space-constrained designs where 4.4 mm width and thermal performance justify TSSOP assembly complexity. |
Compared with 74HCT08N and SN74VHCT08APW, the 74VHCT08AM uniquely balances SOIC-14 manufacturability, industrial-grade power-down robustness, and proven 5 V system interoperability-making it optimal for mid-volume industrial control boards requiring long-term supply stability.
Availability
74VHCT08AM is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy system logic interface, and battery-backed real-time clock control requiring stable component supply and long-lifecycle support.
Supply support for 74VHCT08AM 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 U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed and supported.
The VHCT logic family was designed specifically for high-speed, low-power 5 V CMOS systems requiring TTL input compatibility and enhanced robustness in mixed-voltage and battery-backed environments.
FAQ
What is the maximum supply voltage rating for the 74VHCT08AM?
The 74VHCT08AM supports an absolute maximum supply voltage of –0.5 V to +7.0 V, but its recommended operating range is strictly 4.5 V to 5.5 V. Operation outside this range may cause parametric degradation or reliability issues, even if the device appears functional. The extended absolute rating enables safe handling during board assembly and transient overvoltage events.
Does the 74VHCT08AM support 3.3 V input logic levels?
Yes, the 74VHCT08AM accepts 3.3 V logic HIGH inputs reliably because its VIH threshold is specified at 2.0 V minimum across temperature and supply voltage. A 3.3 V signal exceeds this requirement with margin, making the 74VHCT08AM suitable for interfacing 3.3 V microcontrollers to 5 V peripherals without level shifters.
Can unused inputs on the 74VHCT08AM be left floating?
No, unused inputs on the 74VHCT08AM must be tied HIGH or LOW-never left floating. Floating inputs can cause increased ICC, erratic output behavior, or localized heating due to intermediate biasing of internal CMOS stages. The datasheet explicitly mandates termination to VCC or GND to ensure stable operation and meet specified ICC limits.
Is the 74VHCT08AM pin-compatible with the 74HC08?
No, the 74VHCT08AM is not pin-compatible with the 74HC08. While both are quad 2-input AND gates in 14-pin packages, the 74HC08 uses CMOS input thresholds (VIH ≈ 3.5 V at VCC = 5 V), whereas the 74VHCT08AM uses TTL-compatible thresholds (VIH = 2.0 V). Functionally identical pinouts exist, but electrical behavior differs significantly-direct substitution may cause logic errors in TTL-driven systems.
What is the purpose of power-down protection in the 74VHCT08AM?
Power-down protection in the 74VHCT08AM allows inputs and outputs to safely tolerate voltages from 0 V to 7 V-even when VCC = 0 V-preventing latch-up or damage during power sequencing mismatches, hot-plug events, or battery-backup transitions. This feature eliminates the need for external protection diodes in mixed-supply systems.
74VHCT08AM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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
74VHCT08AM FAQ
1.How can I place an order for 74VHCT08AM through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT08AM 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 74VHCT08AM reliable?
The price and inventory of 74VHCT08AM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT08AM is usually 5 days.
3.What payment methods are accepted for 74VHCT08AM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT08AM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT08AM?
74VHCT08AM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT08AM 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 74VHCT08AM?
For technical support, including 74VHCT08AM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT08AM requirements.
6.How does Aetrix verify that 74VHCT08AM is sourced from the original manufacturer or authorized distributors?
All 74VHCT08AM 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 74VHCT08AM meets industry standards.
7.What is the process for return or replacement of 74VHCT08AM?
All 74VHCT08AM units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT08AM, 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 74VHCT08AM part is unused and in its original packaging.
Return procedure for 74VHCT08AM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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