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Texas Instruments SN74HCT08DR
- Part No.:
- SN74HCT08DR
- Manufacturer:
- Texas Instruments
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HCT08DR.pdf
- Description:
- IC GATE AND 4CH 2-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:14,334
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Product details
Overview
SN74HCT08DR from Texas Instruments is a quadruple 2-input positive-AND gate IC operating at 4.5–5.5 V, delivering 13 ns typical propagation delay, ±4 mA output drive at 5 V, and 20 µA max supply current. It performs Y = A • B logic in positive logic and is used in digital control logic, address decoding, and enable gating in industrial microcontroller interfaces.
For engineers reviewing the SN74HCT08DR datasheet, SN74HCT08DR pinout, SN74HCT08DR application, or SN74HCT08DR equivalent, this page provides verified functional identity, SOIC-14 package mapping, TTL-compatible input thresholds, switching characteristics at 5 V, and validated alternatives for AND-gate logic replacement in legacy 5-V systems.
Technical Context
This device implements four independent, non-inverting 2-input AND gates in a single monolithic CMOS structure with HCT (High-Speed CMOS TTL-compatible) input thresholds. Each gate accepts TTL-level inputs (VIL ≤ 0.8 V, VIH ≥ 2 V) and drives LSTTL loads directly.
It operates strictly within 4.5–5.5 V supply range and supports –40°C to +85°C ambient temperature. No internal pull-ups, level-shifting, or open-drain configuration is present - all outputs are push-pull with defined VOH/VOL across load and voltage conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Four independent 2-input AND gates (Y = A • B), positive logic only |
| Supply Voltage | 4.5 V to 5.5 V - requires stable 5-V rail; not 3.3-V compatible |
| Propagation Delay | 13 ns typical at VCC = 5.5 V, CL = 50 pF - enables <77 MHz toggle rate in cascaded paths |
| Output Drive | ±4 mA at 5 V - sufficient to drive 10 LSTTL inputs without external buffering |
| Input Compatibility | TTL-voltage compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) - interoperable with 74LS, 74F, and legacy microcontrollers |
| Quiescent Current | 20 µA max ICC - enables low-static-power operation in always-on control logic |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems |
Pinout & Package
SN74HCT08DR uses a 14-pin SOIC (D) package measuring 8.65 mm × 6.00 mm × 1.75 mm (max height), with standard 1.27 mm lead pitch and RoHS-compliant NiPdAu/Sn lead finish. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 1B, 2A, 2B, 3A, 3B, 4A, 4B | Input | Eight dedicated TTL-compatible logic inputs - grouped as four A/B pairs per gate |
| 1Y, 2Y, 3Y, 4Y | Output | Four push-pull CMOS outputs - each capable of sourcing/sinking ±4 mA at 5 V |
| VCC (Pin 14) | Power Supply | Positive supply terminal - must be bypassed with 0.1 µF ceramic capacitor placed adjacent to pin |
| GND (Pin 7) | Ground Reference | Common return path for all gates - connects to system ground plane with low-inductance trace |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH ≥ 2 V and VIL ≤ 0.8 V at 4.5–5.5 V - eliminates need for level translators when interfacing with 74LS or microcontroller GPIO |
| Low ICC quiescent current | 20 µA max - reduces standby power in battery-backed or energy-sensitive control modules |
| 13 ns typical tpd | Enables reliable timing in 20-MHz synchronous bus gating and address strobe applications |
| ±4 mA output drive | Directly fans out to 10 LSTTL loads - avoids added buffer ICs in dense logic boards |
| Industrial temperature range | –40°C to +85°C operation - supports deployment in motor drives, PLC I/O modules, and HVAC controllers |
Applications
| Industrial Control Logic | Microcontroller Peripheral Enable |
|---|---|
Use Scenario: Gate enable signals for multiple ADC channels or DAC outputs in programmable logic controllers. IC Role / Device Role / Timing Role: Quad AND gate performing synchronized channel selection via microcontroller GPIO and clock-enable signals. Use Value: Ensures simultaneous, glitch-free activation of analog peripherals using only one IC - reduces board space and routing complexity. |
Use Scenario: Enabling SPI flash memory or UART transceivers only when active, reducing system leakage current. IC Role / Device Role / Timing Role: Logic-level AND gate combining processor chip-select and power-good status before asserting peripheral enable. Use Value: Prevents spurious writes or communication errors during power-up sequencing by requiring dual valid conditions. |
| Address Decoding | Legacy System Bus Gating |
Use Scenario: Generating chip-select signals for memory-mapped peripherals in 8-bit microprocessor systems (e.g., Z80, 8085). IC Role / Device Role / Timing Role: Combining upper address bits and control strobes to decode specific I/O or memory regions. Use Value: Provides deterministic, race-free decoding with sub-15 ns delay - critical for meeting setup/hold timing in 4–6 MHz bus cycles. |
Use Scenario: Inserting conditional gating into legacy data buses to isolate subsystems during firmware updates or diagnostics. IC Role / Device Role / Timing Role: Acting as a synchronous pass-gate controlled by both master clock and software-configurable enable lines. Use Value: Enables hot-swap isolation without modifying PCB layout - leverages existing 5-V logic rails and TTL signal levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AND-gate logic applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC08DR | CMOS input thresholds (VIH = 3.15 V min), higher noise margin but incompatible with true TTL inputs below 2 V | Requires ≥3.15 V high-level input - unsuitable for direct 74LS interface without pull-up or translation | Select only if system uses pure CMOS logic families and operates at 2–6 V; verify input voltage compatibility |
| 74ACT08SCX | Faster tpd (9 ns typ), higher drive (±24 mA), but wider supply range (4.5–5.5 V same) and higher ICC (40 µA) | Higher power consumption and cost - justified only where speed or fanout >10 is required | Prefer for high-speed industrial backplanes or test equipment where 13 ns delay is insufficient |
Compared with SN74HCT08DR, SN74HC08DR lacks TTL input compatibility and cannot replace it in mixed-logic systems, while 74ACT08SCX delivers superior speed and drive at the cost of doubled quiescent current and higher price - making SN74HCT08DR optimal for cost-sensitive, TTL-interfaced 5-V control logic.
Availability
SN74HCT08DR is available at Aetrix Electronics and suitable for industrial control logic, microcontroller peripheral enable, address decoding, and legacy system bus gating requiring stable component supply and long-term obsolescence management.
Supply support for SN74HCT08DR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in industrial and automotive electronics.
The SN74HCT08DR belongs to TI's 74HCT logic family, designed specifically to provide TTL-compatible input thresholds and 5-V CMOS performance for seamless integration into legacy and mixed-signal 5-V systems.
FAQ
What logic family does SN74HCT08DR belong to, and why does that matter?
SN74HCT08DR belongs to the 74HCT (High-Speed CMOS TTL-compatible) logic family. This means its inputs accept standard TTL voltage levels (VIH ≥ 2 V, VIL ≤ 0.8 V), enabling direct interface with older 74LS and microcontroller GPIOs without level shifters. The SN74HCT08DR maintains CMOS power efficiency while ensuring backward compatibility - a key differentiator from standard 74HC devices.
Can SN74HCT08DR operate at 3.3 V?
No, SN74HCT08DR is not rated for 3.3 V operation. Its recommended supply range is strictly 4.5 V to 5.5 V, and input thresholds are defined only within that range. Applying 3.3 V may result in undefined logic states, increased propagation delay, or failure to recognize TTL-high inputs. For 3.3-V systems, consider SN74LVC08A or SN74AHC08 instead.
How many independent gates does SN74HCT08DR contain, and what is their Boolean function?
SN74HCT08DR contains four independent 2-input AND gates. Each performs the Boolean function Y = A • B in positive logic: output Y is HIGH only when both inputs A and B are HIGH. The gates share no internal coupling - all inputs and outputs are electrically isolated except through the common VCC and GND rails.
What is the maximum fanout capability of SN74HCT08DR?
SN74HCT08DR can drive up to 10 LSTTL loads per output, based on its ±4 mA output current specification at 5 V. This fanout value assumes standard LSTTL input characteristics (IIH = 20 µA, IIL = –0.4 mA). When driving CMOS loads or lighter TTL variants, fanout may increase, but loading beyond 10 LSTTL units risks violating VOL/VOL specs and increasing propagation delay.
Is SN74HCT08DR pin-compatible with other 74xx08 variants like SN74LS08 or SN74F08?
Yes, SN74HCT08DR uses the standard 14-pin SOIC (D) package with identical pinout to SN74LS08, SN74F08, and SN74HC08. All share the same 1A/1B/1Y/2A/2B/2Y/GND/3Y/3A/3B/4Y/4A/4B/VCC arrangement. However, electrical compatibility depends on supply voltage and loading - SN74HCT08DR must be powered at 5 V and is not a drop-in replacement for 3.3-V logic families.
SN74HCT08DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 4mA, 4mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 22ns @ 5.5V, 50pF
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74HCT08DR FAQ
1.How can I place an order for SN74HCT08DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT08DR 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 SN74HCT08DR reliable?
The price and inventory of SN74HCT08DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT08DR is usually 5 days.
3.What payment methods are accepted for SN74HCT08DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT08DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT08DR?
SN74HCT08DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT08DR 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 SN74HCT08DR?
For technical support, including SN74HCT08DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT08DR requirements.
6.How does Aetrix verify that SN74HCT08DR is sourced from the original manufacturer or authorized distributors?
All SN74HCT08DR 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 SN74HCT08DR meets industry standards.
7.What is the process for return or replacement of SN74HCT08DR?
All SN74HCT08DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT08DR, 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 SN74HCT08DR part is unused and in its original packaging.
Return procedure for SN74HCT08DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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