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STMicroelectronics 74AC08B
- Part No.:
- 74AC08B
- Manufacturer:
- STMicroelectronics
- Category:
- Gates and Inverters
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
74AC08B.pdf
- Description:
- IC GATE AND 4CH 2-INP 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,221
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Product details
Overview
74AC08B from STMicroelectronics is a quad 2-input AND gate in plastic DIP-14 package, operating from 2V to 6V supply, with 4ns typical propagation delay at 5V, ±24mA symmetrical output drive, and 2µA max quiescent current at 25°C - used in high-speed digital logic interfacing, address decoding, and enable gating in industrial control systems.
For engineers reviewing the 74AC08B datasheet, 74AC08B pinout, 74AC08B application, or 74AC08B equivalent, key selection criteria include propagation delay matching, 50Ω transmission line drive capability, noise immunity (28% VCC), symmetrical tPLH/tPHL, and compatibility with legacy 74-series logic families.
Technical Context
The 74AC08B implements four independent AND gates using sub-micron C2MOS technology with buffered outputs, delivering balanced rise/fall times and stable switching across temperature (–55°C to +125°C). Its internal two-stage architecture enhances noise rejection while maintaining low power consumption.
It supports incident-wave switching on 50Ω transmission lines and features ESD protection (2kV HBM) on all I/O pins. Input thresholds scale with VCC (VIH = 2.1V min at 3V, 3.15V at 4.5V), enabling reliable operation across its full 2–6V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - enables direct interface with mixed-voltage systems (3.3V/5V) without level shifters |
| tPD (Typ) | 4ns at VCC = 5V - supports >100MHz toggle rates in critical timing paths |
| IOL / IOH | ±24mA min - drives 50Ω transmission lines directly with clean edge integrity |
| VNIH / VNIL | 28% VCC min - provides robust noise margin against crosstalk and ground bounce |
| ICC (Max) | 2µA at TA = 25°C - enables ultra-low static power in battery-backed or standby logic |
| CIN | 4pF - minimizes capacitive loading on driving stages and preserves signal slew rate |
| Operating Temp | –55°C to +125°C - qualified for extended industrial and automotive under-hood environments |
Pinout & Package
74AC08B is supplied in a 14-pin plastic dual in-line package (DIP-14) with 0.3" body width and 2.54mm pitch. Pin 1 is marked by a notch or dot; pins are arranged in two parallel rows of seven.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | Input A (Gate 1–4) | First input per AND gate; accepts TTL- or CMOS-level signals across full VCC range |
| 2, 5, 10, 13 | Input B (Gate 1–4) | Second input per AND gate; electrically identical to Input A, fully interchangeable |
| 3, 6, 8, 11 | Output Y (Gate 1–4) | Active-high AND result; capable of sourcing/sinking 24mA with matched impedance |
| 7 | GND | Logic ground reference; must be low-impedance connection to minimize switching noise |
| 14 | VCC | Positive supply rail; bypassing with 0.1µF ceramic capacitor near pin is mandatory for stability |
Key Features
| Feature | Design Value |
|---|---|
| High-speed propagation | 4ns typical delay at 5V enables use in 100+ MHz clock domains and fast enable/control paths |
| 50Ω transmission line drive | Guaranteed incident-wave switching on 50Ω traces eliminates need for external series termination |
| Supply voltage flexibility | 2V–6V operation allows seamless integration into 3.3V, 5V, and mixed-supply digital subsystems |
| ESD robustness | 2kV HBM rating on all pins reduces risk of field failure during handling and board assembly |
| Pin-compatible upgrade | Direct replacement for standard 74LS08 and 74HC08 in existing DIP-14 footprints |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Enabling/disabling sensor readout channels based on system mode and diagnostic state. IC Role / Device Role / Timing Role: Quad AND gate performing synchronous channel gating with sub-5ns latency. Use Value: Eliminates need for discrete transistors or microcontroller GPIO expansion, reducing BOM count and PCB area. | Use Scenario: Combining door lock status and ignition key presence signals to activate interior lighting logic. IC Role / Device Role / Timing Role: Level-sensitive combinatorial logic block with guaranteed noise-immune inputs. Use Value: Provides deterministic, glitch-free output even under harsh electrical conditions (load dump, alternator ripple). |
| Test Equipment Signal Routing | Legacy System Bus Interface |
Use Scenario: Selectively routing clock or data strobes between multiple instrument modules via front-panel switches. IC Role / Device Role / Timing Role: High-fidelity signal gating element preserving edge integrity on 50Ω coaxial paths. Use Value: Maintains <4ns skew across all four gates, ensuring phase coherence in multi-channel timing applications. | Use Scenario: Translating and qualifying handshaking signals (e.g., READY, WAIT) between older 5V CPU buses and newer peripherals. IC Role / Device Role / Timing Role: Voltage-tolerant logic interface with 28% VCC noise margin and 5V-compatible outputs. Use Value: Enables drop-in interoperability without redesigning bus termination or adding level translators. |
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 |
|---|---|---|---|
| 74HC08N | Slower tPD (15ns typ at 5V); lower drive (±4mA); no 50Ω line drive guarantee | Suitable only for low-speed, low-noise, low-current logic; not for transmission line routing | Select when cost is primary constraint and speed/noise requirements are relaxed |
| SN74ACT08N | Near-identical AC specs; same DIP-14 package; TI's version with tighter VOH/VOL tolerances at high sink/source | Drop-in compatible in most designs; preferred where TI qualification or long-term supply assurance is required | Select for cross-manufacturer redundancy or TI-aligned design ecosystems |
Compared with 74HC08N, the 74AC08B delivers 3.7× faster propagation and 6× higher drive strength; versus SN74ACT08N, it offers equivalent performance with ST's extended temperature and ESD qualifications.
Availability
74AC08B is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and test equipment signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AC08B 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs for industrial, automotive, and consumer markets.
The 74AC logic family targets high-speed, low-power, and noise-immune digital interfacing - optimized for applications demanding both TTL compatibility and CMOS efficiency.
FAQ
Is 74AC08B compatible with 5V TTL input levels?
Yes. At VCC = 5V, VIH is guaranteed ≥3.15V and VIL ≤1.35V, exceeding standard TTL thresholds (2.0V/0.8V). Inputs are fully TTL-compatible and tolerate 5V signals even when VCC is as low as 3.3V, making it ideal for mixed-voltage interfacing.
Can 74AC08B drive a 50Ω coaxial cable directly?
Yes. The datasheet explicitly guarantees incident-wave switching on 50Ω transmission lines, supported by symmetrical ±24mA output drive and matched output impedance. No external series resistor is needed for point-to-point routing up to ~15cm at 100MHz.
What is the maximum recommended operating frequency for 74AC08B?
While not specified as a clocked device, its 4ns typical propagation delay supports reliable toggling up to ~100MHz in well-terminated, low-capacitance layouts. Maximum usable frequency depends on load capacitance, trace length, and supply decoupling - verified up to 80MHz in standard 50pF load tests.
Does 74AC08B require input pull-up or pull-down resistors?
No. All inputs have high-impedance CMOS structure with built-in protection diodes. Unused inputs must be tied to VCC or GND to prevent floating states and potential shoot-through current; pull-up/down resistors are unnecessary unless signal conditioning (e.g., debouncing) is required externally.
74AC08B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74AC
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- AND Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Max):
- 2 µA
- Current - Output High, Low:
- 24mA, 24mA
- Input Logic Level - Low:
- 0.9V ~ 1.65V
- Input Logic Level - High:
- 2.1V ~ 3.85V
- Max Propagation Delay @ V, Max CL:
- 7.5ns @ 5V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-DIP
74AC08B FAQ
1.How can I place an order for 74AC08B through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC08B 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 74AC08B reliable?
The price and inventory of 74AC08B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC08B is usually 5 days.
3.What payment methods are accepted for 74AC08B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC08B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC08B?
74AC08B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC08B 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 74AC08B?
For technical support, including 74AC08B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC08B requirements.
6.How does Aetrix verify that 74AC08B is sourced from the original manufacturer or authorized distributors?
All 74AC08B 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 74AC08B meets industry standards.
7.What is the process for return or replacement of 74AC08B?
All 74AC08B units undergo pre-shipment inspection (PSI). If there is an issue with 74AC08B, 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 74AC08B part is unused and in its original packaging.
Return procedure for 74AC08B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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