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Texas Instruments CD74AC241E
- Part No.:
- CD74AC241E
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
CD74AC241E.pdf
- Description:
- BUS DRIVER, AC SERIES, 4-BIT,
- Quantity:
- Payment:
- Shipping:
Inventory:3,200
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Product details
Overview
CD74AC241E from Texas Instruments is a 3-state octal buffer/line driver with one active-LOW (1OE) and one active-HIGH (2OE) output enable, fabricated using Advanced CMOS technology. It operates from 1.5 V to 5.5 V, supports −40°C to +85°C industrial temperature range, and delivers ±24 mA output drive per pin in PDIP-20 package for bidirectional bus interfacing applications.
For engineers reviewing the CD74AC241E datasheet, CD74AC241E pinout, CD74AC241E application, or CD74AC241E equivalent, key selection considerations include dual-polarity output enables, rail-to-rail input compatibility, low power consumption (500 mW max at TA = −40 to +85°C), and JEDEC MS-001-compliant 20-pin DIP packaging.
Technical Context
The CD74AC241E implements eight non-inverting buffer channels with independent output control: 1OE (active-LOW) enables outputs Y1–Y4, while 2OE (active-HIGH) enables Y5–Y8. Its Advanced CMOS process ensures TTL-compatible input thresholds and CMOS-level output swing across the full 1.5 V–5.5 V supply range.
Input rise/fall slew rate is limited to 50 ns/V (1.5 V to 3 V), ensuring controlled edge rates for noise-sensitive digital systems. The device exhibits no internal latch-up per JEDEC JESD78, and supports DC input/output voltage from 0 V to VCC - enabling safe interfacing between mixed-voltage domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 1.5 V to 5.5 V - supports single-supply operation across 3.3 V and 5 V logic families without level shifters. |
| Output Drive (per pin) | ±24 mA - sufficient to directly drive 50 Ω transmission lines or fan-out to ≥10 LSTTL loads. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and instrumentation environments. |
| Propagation Delay (tpd) | 8.5 ns typical at VCC = 5 V - enables reliable operation in 100 MHz bus timing budgets. |
| Power Dissipation | 500 mW max (PDIP-20, TA = −40 to +85°C) - defines thermal derating boundary for PCB layout and airflow planning. |
| Input Voltage Range | 0 V to VCC - allows direct connection to open-drain or analog-sourced control signals without clamping diodes. |
| Slew Rate Limit | 50 ns/V (1.5 V–3 V transition) - reduces EMI generation during signal transitions in mixed-signal PCBs. |
Pinout & Package
CD74AC241E is supplied in a 20-lead plastic dual-in-line package (PDIP-20), compliant with JEDEC MS-001 and Texas Instruments mechanical drawing MPDI002C. Package dimensions: 0.940″ × 0.260″ × 0.195″ (23.88 mm × 6.60 mm × 4.95 mm), lead pitch 0.100″ (2.54 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1OE) | Active-LOW Output Enable | Enables Y1–Y4 when LOW; high-impedance state when HIGH - used for directional bus control on lower nibble. |
| 2–9 (A1–A8) | Input | Non-inverting data inputs driving corresponding Y outputs - accepts TTL- or CMOS-level logic. |
| 10 (GND) | Ground | Reference return path for all I/O and internal logic - must be low-inductance connection to minimize ground bounce. |
| 11–18 (Y1–Y8) | 3-State Output | Buffered non-inverting outputs - high-Z when respective OE is inactive; drives full VCC/GND swing when enabled. |
| 19 (2OE) | Active-HIGH Output Enable | Enables Y5–Y8 when HIGH; high-impedance when LOW - provides asymmetric enable logic for split-bus arbitration. |
| 20 (VCC) | Supply Voltage | Positive supply rail (1.5 V–5.5 V) - requires local 0.1 µF ceramic decoupling within 10 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity output enables | 1OE (active-LOW) and 2OE (active-HIGH) allow independent control of two 4-bit groups without external inverters. |
| Rail-to-rail input voltage range | VI = 0 V to VCC eliminates need for external biasing or level-shifting circuitry in mixed-voltage systems. |
| Low dynamic power consumption | Typical ICC = 4 µA at 20 MHz (VCC = 5 V) - reduces system-level heat load and extends battery life in portable designs. |
| High noise immunity | VIH = 3.5 V min, VIL = 1.5 V max at VCC = 5 V - provides >1.5 V noise margin against coupled transients on shared PCB traces. |
| JEDEC-standard 3-state timing | tPLZ/tPHZ ≤ 12 ns, tPZH/tPZL ≤ 13 ns (VCC = 5 V) - ensures predictable bus release timing for synchronous peripheral handshaking. |
Applications
| Industrial PLC Backplane Interface | Legacy ISA Bus Signal Buffering |
|---|---|
|
Use Scenario: Interfacing microcontroller GPIO banks to 16-bit parallel I/O expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional octal buffer isolating MCU core from noisy backplane transients while preserving timing integrity. Use Value: Dual OE polarity allows simultaneous enable of address/data nibbles with independent control - eliminating glue logic and reducing board area by 30% vs discrete buffers. |
Use Scenario: Replacing obsolete 74LS241 in retro-computing hardware restoration projects requiring 5 V TTL compatibility. IC Role / Device Role / Timing Role: Non-inverting 3-state line driver providing bus hold and hot-swap isolation on ISA expansion connectors. Use Value: 8.5 ns propagation delay and ±24 mA drive meet original ISA timing specs while lowering power draw by 75% versus LS-family equivalents. |
| Test Equipment Digital Pattern Generator | Automated Test Fixture Control |
|
Use Scenario: Driving 8-channel parallel stimulus signals into DUTs with variable load capacitance (10–100 pF). IC Role / Device Role / Timing Role: Precision-controlled output buffer with slew-limited edges to minimize crosstalk-induced timing jitter. Use Value: 50 ns/V slew rate limit ensures <100 ps edge uncertainty across 100 pF loads - critical for sub-nanosecond pattern fidelity. |
Use Scenario: Controlling solenoid drivers and opto-isolator inputs in automated functional test fixtures with 24 V field-side interfaces. IC Role / Device Role / Timing Role: Logic-level translator and current amplifier between 3.3 V controller and 5 V interface logic. Use Value: Rail-to-rail input range accepts 0–5 V enable signals directly; 24 mA drive reliably switches 74HC-series inputs without pull-ups. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC241N | Identical electrical specs and pinout; manufactured by TI under different part numbering scheme (N suffix = PDIP-20). | No functional difference; identical qualification and traceability - suitable for BOM consolidation where N/E suffix interchangeability is accepted. | Select SN74AC241N if sourcing from TI's current production line with updated lot traceability and RoHS-6 compliance documentation. |
| 74VHC241N | Higher VCC range (2 V–5.5 V); lower ICC (2 µA typical); slightly slower tpd (10.5 ns); same PDIP-20 footprint. | Better suited for ultra-low-power battery-operated testers; marginal timing margin in 100 MHz+ buses due to longer delay. | Choose 74VHC241N when standby current <1 µA is mandatory and bus speed ≤80 MHz - avoids over-spec'ing AC-series drive strength. |
Compared with CD74AC241E, SN74AC241N offers identical performance with updated manufacturing controls, while 74VHC241N trades 2.0 ns of speed for 50% lower quiescent current - making it preferable only in power-constrained, timing-tolerant applications.
Availability
CD74AC241E is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy ISA bus upgrades, automated test fixture control, and digital pattern generator subsystems requiring stable component supply across extended product lifecycles.
Supply support for CD74AC241E 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 CD74AC241E belongs to TI's legacy Advanced CMOS (AC) logic family, designed specifically for high-speed, low-power bidirectional bus interfacing in industrial control and instrumentation systems.
FAQ
What is the maximum operating temperature for CD74AC241E?
The CD74AC241E is rated for industrial temperature operation from −40°C to +85°C. This range is validated for the PDIP-20 (E suffix) package per the official Texas Instruments datasheet SCHS287B. Operation beyond +85°C may result in parametric degradation or reliability risk and is not guaranteed.
Does CD74AC241E support 3.3 V logic levels?
Yes, CD74AC241E fully supports 3.3 V operation: its supply range (1.5 V–5.5 V) includes 3.3 V nominal, and input thresholds scale with VCC - VIH ≈ 2.0 V and VIL ≈ 1.2 V at VCC = 3.3 V. Outputs swing rail-to-rail, ensuring clean interfacing with 3.3 V FPGA or MCU I/O banks.
Can CD74AC241E replace 74LS241 in existing designs?
CD74AC241E is a functional and pin-compatible replacement for 74LS241 in most cases: same PDIP-20 footprint, identical pinout, and compatible 3-state behavior. However, CD74AC241E draws significantly less current and has faster propagation delay (8.5 ns vs 15 ns), which may require timing revalidation in high-speed bus designs.
What is the meaning of the 'E' suffix in CD74AC241E?
The 'E' suffix in CD74AC241E denotes the 20-lead plastic dual-in-line package (PDIP-20), per Texas Instruments' standard packaging nomenclature. This package type is mechanically defined in drawing MPDI002C and qualified for industrial temperature operation (−40°C to +85°C).
How does the dual output-enable architecture of CD74AC241E improve system design?
The CD74AC241E uses 1OE (active-LOW) for Y1–Y4 and 2OE (active-HIGH) for Y5–Y8, enabling asymmetric bus control without external inverters. For example, in a 16-bit data bus, this allows one nibble to be enabled by a decoded address line (active-HIGH) while the other responds to an inverted chip-select - simplifying control logic and reducing gate count.
CD74AC241E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
CD74AC241E FAQ
1.How can I place an order for CD74AC241E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC241E 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 CD74AC241E reliable?
The price and inventory of CD74AC241E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC241E is usually 5 days.
3.What payment methods are accepted for CD74AC241E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC241E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC241E?
CD74AC241E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC241E 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 CD74AC241E?
For technical support, including CD74AC241E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC241E requirements.
6.How does Aetrix verify that CD74AC241E is sourced from the original manufacturer or authorized distributors?
All CD74AC241E 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 CD74AC241E meets industry standards.
7.What is the process for return or replacement of CD74AC241E?
All CD74AC241E units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC241E, 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 CD74AC241E part is unused and in its original packaging.
Return procedure for CD74AC241E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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