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Texas Instruments CD74HC241E
- Part No.:
- CD74HC241E
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HC241E.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:744
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Product details
Overview
CD74HC241E from Texas Instruments is a non-inverting octal buffer/line driver with three-state outputs, featuring one active-high (1OE) and one active-low (2OE) output enable control. It operates across 2 V to 6 V, delivers 7.8 mA sink/source drive per output, supports –55°C to +125°C industrial/military temperature range, and exhibits 9 ns typical propagation delay at 5 V/15 pF. It is used in bidirectional bus interfacing and memory address/data buffering.
For engineers reviewing the CD74HC241E datasheet, CD74HC241E pinout, CD74HC241E application, or CD74HC241E equivalent, this page provides verified functional identity, validated 20-pin PDIP package mapping, confirmed non-inverting three-state logic behavior, real-world drive capability (7.8 mA), and precise thermal and timing specifications aligned with TI's SCHS167G revision G data sheet.
Technical Context
The CD74HC241E implements dual-gated non-inverting buffer architecture: four inputs (1A1–1A4) feed four outputs (1Y1–1Y4) under control of active-high 1OE, while another four inputs (2A1–2A4) drive outputs (2Y1–2Y4) via active-low 2OE. Both output groups enter high-impedance state independently when their respective enables are inactive.
All eight buffers share identical electrical characteristics - including 10 pF input capacitance, 20 pF three-state output capacitance, and CMOS-compatible VIH/VIL thresholds - and maintain balanced tPLH/tPHL propagation delays across voltage (2–6 V) and temperature (–55°C to 125°C) ranges per TI SCHS167G.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Type | Non-inverting octal buffer with independent three-state control (1OE active-high, 2OE active-low) |
| Supply Voltage Range | 2 V to 6 V - enables direct interface with 3.3 V and 5 V systems without level shifters |
| Output Drive | ±7.8 mA at VCC = 6 V - sufficient for driving 15 LSTTL loads or terminated transmission lines |
| Propagation Delay | 9 ns typical at VCC = 4.5 V, CL = 15 pF - supports >30 MHz bus operation in low-skew configurations |
| Operating Temperature | –55°C to +125°C - qualified for aerospace, automotive under-hood, and industrial control environments |
| Input Leakage | ±1 μA max at VCC = 6 V - ensures stable logic states with high-impedance or weak-pull sources |
| Three-State Leakage | ±10 μA max at VCC = 6 V - minimizes bus contention current during disable transitions |
Pinout & Package
CD74HC241E is supplied in a 20-pin plastic dual in-line package (PDIP) with 25.40 mm × 6.35 mm body size and 2.54 mm lead pitch. Pin 1 is located at the left end of the top row when viewed with notch up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1OE) | Active-high output enable for Y1–Y4 | Drives 1Y1–1Y4 into high-Z when LOW; must be pulled HIGH or driven for normal operation |
| 2–5 (1A1–1A4) | Inputs for first buffer group | Non-inverting inputs tied directly to 1Y1–1Y4; require defined logic levels (no floating) |
| 6–9 (1Y1–1Y4) | Outputs for first buffer group | Three-state outputs enabled only when 1OE = HIGH; otherwise high-impedance |
| 10 (GND) | Ground reference | Primary return path for all internal logic and output currents; must be low-inductance connection |
| 11–14 (2Y1–2Y4) | Outputs for second buffer group | Three-state outputs enabled only when 2OE = LOW; otherwise high-impedance |
| 15–18 (2A1–2A4) | Inputs for second buffer group | Non-inverting inputs tied directly to 2Y1–2Y4; require defined logic levels (no floating) |
| 19 (2OE) | Active-low output enable for Y1–Y4 | Drives 2Y1–2Y4 into high-Z when HIGH; must be pulled LOW or driven for normal operation |
| 20 (VCC) | Positive supply | Power rail for all logic and output stages; requires local 0.1 μF bypass capacitor per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-enable control | Enables asymmetric bus arbitration: e.g., master-side 1OE driven by processor GPIO, slave-side 2OE tied to peripheral READY signal |
| High-current bus driver outputs | ±7.8 mA drive at 6 V allows direct connection to unterminated 50 Ω traces or legacy TTL loads without external drivers |
| Wide supply range (2–6 V) | Supports mixed-voltage system integration - e.g., 3.3 V microcontroller controlling 5 V peripheral bus - without translation ICs |
| Industrial temperature range | –55°C to +125°C operation eliminates derating concerns in extended-environment applications like motor drives and avionics |
| Low dynamic power dissipation | CPD = 34 pF enables <1 mW/channel at 1 MHz/5 V - critical for thermally constrained embedded modules |
Applications
| Memory Address Buffering | Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Isolating and driving 8-bit address lines from an MCU to external SRAM or EPROM. IC Role / Device Role / Timing Role: Non-inverting buffer with independent enables isolates MCU address bus during DMA cycles and prevents loading. Use Value: 7.8 mA drive ensures full-swing 5 V address signals over 10 cm PCB traces; dual enables allow simultaneous or staggered address latching. |
Use Scenario: Extending GPIO count of an 8-bit microcontroller to drive multiple peripherals via shared data bus. IC Role / Device Role / Timing Role: Three-state octal driver acts as bi-directional bus transceiver, enabling time-multiplexed peripheral access. Use Value: Independent 1OE/2OE pins permit precise timing control - e.g., 1OE synchronized to write strobe, 2OE to read strobe - eliminating bus contention. |
| Industrial I/O Module Interface | Legacy System Bus Isolation |
|
Use Scenario: Interfacing PLC CPU module to isolated digital I/O cards using long backplane traces. IC Role / Device Role / Timing Role: High-noise-immunity buffer (NIL/NIH = 30% at 5 V) conditions signals before transmission over noisy industrial backplanes. Use Value: –55°C to +125°C rating and ±7.8 mA drive ensure reliable operation in uncooled control cabinets; 9 ns delay preserves timing margins in 20 MHz bus cycles. |
Use Scenario: Isolating aging 5 V TTL-based instrumentation bus from modern 3.3 V FPGA controller. IC Role / Device Role / Timing Role: Level-tolerant HC-family buffer translates logic levels while providing bus contention protection via three-state control. Use Value: 2 V to 6 V supply range allows VCC = 3.3 V operation with full 5 V-tolerant inputs; dual enables support hot-swap protocol sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC244N | Two active-low output enables (1OE, 2OE); identical pinout and DC specs but different enable polarity | Requires inverted enable logic - e.g., MCU GPIO must drive LOW to enable outputs instead of HIGH | Select when existing firmware/hardware already uses active-low enable signaling and board layout cannot change |
| CD74HCT241E | TTL-compatible inputs (VIH = 2 V min, VIL = 0.8 V max); same pinout, package, and enable configuration | Better interoperability with legacy 5 V TTL logic families; not suitable for 3.3 V-only systems without pull-ups | Select when interfacing directly to 74LS or other TTL devices where HC-level thresholds may cause marginal switching |
Compared with SN74HC244N and CD74HCT241E, CD74HC241E uniquely combines mixed-polarity enables (1OE active-high + 2OE active-low) with wide-voltage CMOS inputs, enabling flexible bus arbitration schemes and seamless integration across 2–6 V logic domains without level translation.
Availability
CD74HC241E is available at Aetrix Electronics and suitable for industrial control systems, aerospace data acquisition modules, and legacy bus interface designs requiring stable component supply across extended temperature and voltage ranges.
Supply support for CD74HC241E 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 company specializing in analog, embedded processing, and logic solutions, with leadership in high-reliability industrial and automotive-grade components.
The CD74HC241E belongs to TI's CD74HC high-speed CMOS logic family, designed specifically for robust, low-power bus interfacing in harsh environments where wide temperature operation and noise immunity are critical.
FAQ
What is the function of the two output enable pins on CD74HC241E?
The CD74HC241E features two independent output enable controls: pin 1 (1OE) is active-high and enables the first four outputs (1Y1–1Y4), while pin 19 (2OE) is active-low and enables the second four outputs (2Y1–2Y4). This allows asymmetric bus control - for example, enabling one group during write cycles and the other during read cycles - without requiring external logic inversion. Each group enters high-impedance state when its respective enable is inactive, preventing bus contention in multi-master systems.
Can CD74HC241E operate reliably at 3.3 V supply voltage?
Yes, CD74HC241E is fully specified for operation from 2 V to 6 V, including 3.3 V. At VCC = 3.3 V, it maintains VIH ≥ 2.31 V and VIL ≤ 0.99 V (30% noise margin), supports ±6 mA output drive, and achieves ~12 ns typical propagation delay. Its HC-series CMOS inputs are compatible with both 3.3 V and 5 V logic families, making CD74HC241E ideal for mixed-voltage board designs without level shifters.
How does CD74HC241E differ from CD74HC244E in pinout and functionality?
CD74HC241E and CD74HC244E share identical 20-pin PDIP pinouts and DC/AC electrical specifications, but differ in enable polarity: CD74HC241E has one active-high (1OE) and one active-low (2OE) enable, whereas CD74HC244E has two active-low enables (1OE, 2OE). This means CD74HC241E allows native support for both asserted-HIGH and asserted-LOW control signals - useful in systems where one bus segment uses positive logic enables and another uses negative logic - without adding inverters.
What is the maximum output current per pin for CD74HC241E, and how is it tested?
CD74HC241E delivers ±7.8 mA DC output current per pin at VCC = 6 V, as specified in TI's SCHS167G datasheet Section 5.5. This value is measured under steady-state conditions with VO = 0.4 V (for sink) or VO = VCC – 0.4 V (for source), ensuring the device remains within safe operating area. The ±7.8 mA rating supports driving 15 LSTTL loads or terminating 50 Ω transmission lines, and is validated across the full –55°C to +125°C temperature range.
Does CD74HC241E require external bypass capacitors, and if so, what value is recommended?
Yes, CD74HC241E requires a local bypass capacitor on the VCC pin (pin 20) to suppress supply noise and prevent logic glitches during output switching. Texas Instruments recommends a 0.1 μF ceramic capacitor placed as close as possible to the VCC and GND pins (pin 10). For improved high-frequency noise rejection, a parallel 1 μF tantalum or ceramic capacitor may be added - but the 0.1 μF part is mandatory per TI's layout guidelines in Section 8 of the CD74HC241E datasheet.
CD74HC241E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74HC241E FAQ
1.How can I place an order for CD74HC241E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC241E 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 CD74HC241E reliable?
The price and inventory of CD74HC241E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC241E is usually 5 days.
3.What payment methods are accepted for CD74HC241E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC241E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC241E?
CD74HC241E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC241E 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 CD74HC241E?
For technical support, including CD74HC241E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC241E requirements.
6.How does Aetrix verify that CD74HC241E is sourced from the original manufacturer or authorized distributors?
All CD74HC241E 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 CD74HC241E meets industry standards.
7.What is the process for return or replacement of CD74HC241E?
All CD74HC241E units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC241E, 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 CD74HC241E part is unused and in its original packaging.
Return procedure for CD74HC241E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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