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Texas Instruments SN74HC241NS
- Part No.:
- SN74HC241NS
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC241NS.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:5,800
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Product details
Overview
SN74HC241NS from Texas Instruments is an octal non-inverting 3-state buffer/line driver in a 20-pin SOIC package, operating at 2–6 V supply, with typical propagation delay of 7 ns at 5 V, input capacitance of 3.5 pF, and bus-driver output capability for TTL/CMOS system interfacing in data bus isolation applications.
For engineers reviewing the SN74HC241NS datasheet, SN74HC241NS pinout, SN74HC241NS application, or SN74HC241NS equivalent, key selection factors include dual independent 3-state control (1OE active-low, 2OE active-high), symmetric 4-bit input/output grouping, CMOS-level input thresholds, and compatibility with LSTTL logic families in mixed-voltage bus systems.
Technical Context
The SN74HC241NS implements two independent 4-bit non-inverting buffer sections, each with dedicated 3-state enable control: Section 1 uses active-low 1OE (Pin 1) to drive outputs 1Y0–1Y3 (Pins 12,14,16,18), while Section 2 uses active-high 2OE (Pin 19) to drive outputs 2Y0–2Y3 (Pins 3,5,7,9). Both sections accept inputs across Pins 2,4,6,8 (1A0–1A3) and Pins 11,13,15,17 (2A0–2A3).
It complies with JEDEC Standard No. 7A and exhibits CMOS input characteristics (VIH ≥ 3.15 V, VIL ≤ 1.35 V at VCC = 4.5 V), supports rail-to-rail output swing, and delivers ±6 mA output drive at VCC = 4.5 V per channel - sufficient for driving standard 50-pF loads with controlled edge rates (tTHL/tTLH ≤ 15 ns at 4.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - enables interoperability between 3.3 V and 5 V logic domains without level shifters |
| Propagation Delay | 7 ns typical (1An→1Yn, VCC = 5 V, CL = 15 pF) - supports >50 MHz bus toggle rates in buffered paths |
| Input Capacitance | 3.5 pF - minimizes capacitive loading on upstream drivers and preserves signal integrity in fan-out chains |
| Output Drive | ±6 mA (VCC = 4.5 V) - sufficient to drive one LSTTL unit load or four CMOS loads simultaneously |
| 3-State Enable Times | tPZL = 11 ns typ., tPLZ = 14 ns typ. (VCC = 5 V) - ensures clean bus release before next driver activation |
| Power Dissipation Cap. | 30 pF per buffer - used to calculate dynamic power under real switching conditions (PD = CPD × VCC² × fi) |
Pinout & Package
SN74HC241NS is housed in a 20-pin plastic small-outline integrated circuit (SOIC) package with 0.300-inch body width and 1.27 mm lead pitch, compliant with JEDEC MS-013AC and Philips SOT-18.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE | Active-low enable for outputs 1Y0–1Y3; asserts low-impedance drive when LOW |
| 2,4,6,8 | 1A0–1A3 | Data inputs for first 4-bit buffer section; routed directly to corresponding 1Yn outputs |
| 3,5,7,9 | 2Y0–2Y3 | Outputs of second 4-bit buffer section; driven only when 2OE = HIGH |
| 10 | GND | Ground reference for all internal logic and I/O structures |
| 11,13,15,17 | 2A0–2A3 | Data inputs for second 4-bit buffer section; non-inverting path to 2Yn |
| 12,14,16,18 | 1Y0–1Y3 | Outputs of first 4-bit buffer section; high-impedance when 1OE = HIGH |
| 19 | 2OE | Active-high enable for outputs 2Y0–2Y3; asserts drive when HIGH |
| 20 | VCC | Positive supply rail (2–6 V); powers all internal logic and output stages |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state control | Separate active-low (1OE) and active-high (2OE) enables allow asymmetric bus arbitration timing |
| CMOS input compatibility | VIH ≥ 70% VCC and VIL ≤ 30% VCC ensure robust noise margin against crosstalk and ground bounce |
| Bus-driver output strength | ±6 mA drive at 4.5 V meets LSTTL fan-out requirement (100 Ω termination into 50 pF) |
| Low dynamic power | CPD = 30 pF enables accurate µW-level power estimation for battery-powered or thermally constrained designs |
Applications
| Microprocessor Data Bus Isolation | Memory Address Buffering |
|---|---|
Use Scenario: Isolating bidirectional data buses between CPU and peripheral controllers to prevent contention during DMA cycles. IC Role / Device Role / Timing Role: SN74HC241NS acts as direction-controlled unidirectional buffer, with 1OE and 2OE sequenced to gate data flow during read/write phases. Use Value: Prevents bus conflicts via fast 3-state disable (tPLZ = 14 ns typ.), enabling sub-20 ns bus turnaround in 8-bit systems. | Use Scenario: Driving address lines from microcontroller to multiple SRAM or EPROM devices sharing a common address bus. IC Role / Device Role / Timing Role: SN74HC241NS serves as address line repeater, isolating MCU pins from cumulative capacitive load of parallel memory chips. Use Value: Reduces effective address bus capacitance by 75% versus direct connection, improving setup/hold timing margins by >3 ns. |
| Legacy TTL-to-CMOS Interface | Programmable Logic I/O Expansion |
Use Scenario: Interfacing 5 V LSTTL outputs (e.g., 74LS138 decoder) to 3.3 V FPGA I/O banks requiring CMOS-compatible inputs. IC Role / Device Role / Timing Role: SN74HC241NS functions as voltage-tolerant level translator and current booster, accepting LSTTL VOH/VOL and delivering CMOS VIH/VIL. Use Value: Eliminates need for discrete resistor dividers or dedicated level shifters while maintaining <10 ns added delay. | Use Scenario: Expanding I/O count of CPLD-based control logic by adding isolated, software-controllable output groups. IC Role / Device Role / Timing Role: SN74HC241NS provides two independently enabled 4-bit output ports, mapped to CPLD GPIOs and controlled via register bits. Use Value: Enables dynamic reconfiguration of peripheral drive paths without hardware changes - e.g., toggling 2OE to switch between sensor and actuator banks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT241NS | TTL-compatible input thresholds (VIH = 2.0 V min), higher ICC at VCC = 4.5 V (+1.2 mA vs HC) | Better suited for mixed 5 V TTL/CMOS systems where input noise immunity must match legacy LSTTL specs | Select SN74HCT241NS when interfacing directly to 74LS/74ALS outputs without pull-ups |
| 74LCX241M | Lower VCC range (2.0–3.6 V), guaranteed 5 V-tolerant inputs, 3.5 ns faster propagation at 3.3 V | Optimized for 3.3 V-only systems with 5 V-tolerant I/O, not suitable for 5 V-only operation | Choose 74LCX241M for modern low-voltage embedded designs requiring 5 V-safe inputs and sub-5 ns delay |
Compared with SN74HC241NS, SN74HCT241NS offers stronger TTL input compatibility but higher quiescent current, while 74LCX241M delivers superior speed and voltage flexibility at 3.3 V but lacks 5 V operation - making SN74HC241NS the optimal choice for dual-voltage (3.3 V/5 V) bus isolation where input threshold symmetry and wide supply range are critical.
Availability
SN74HC241NS is available at Aetrix Electronics and suitable for microprocessor bus isolation, memory address buffering, legacy TTL-to-CMOS interface, and programmable logic I/O expansion requiring stable component supply across industrial, test equipment, and legacy system repair programs.
Supply support for SN74HC241NS 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 high-reliability logic ICs.
The SN74HC241NS belongs to TI's 74HC high-speed CMOS logic family, designed specifically for low-power, pin-compatible replacements of legacy TTL bus interfaces while maintaining full AC/DC electrical compatibility.
FAQ
What is the maximum supply voltage rating for SN74HC241NS?
The SN74HC241NS has an absolute maximum supply voltage (VCC) of 7 V, but its recommended operating range is 2 V to 6 V. Operation above 6 V risks exceeding internal oxide breakdown limits and may cause permanent damage. At 6 V, propagation delay improves slightly (tPLH ≈ 6 ns typ.), while output drive increases to ±7.8 mA - verified per TI's 74HC Family Specifications document.
Does SN74HC241NS support hot insertion or live bus swapping?
No, SN74HC241NS does not support hot insertion. Its inputs lack powered-off protection (no Ioff), and outputs can source/sink current even when VCC = 0 V if input voltages exceed GND–0.5 V or VCC+0.5 V. For live-swap applications, TI recommends using 74LVC241 or 74ALVC241 variants with Ioff and power-down protection features instead of SN74HC241NS.
Can SN74HC241NS drive a 50 Ω transmission line directly?
SN74HC241NS is not designed for direct 50 Ω line driving. Its output impedance is ~35 Ω (typ.) at VCC = 4.5 V, resulting in significant reflections and overshoot on unterminated 50 Ω traces. For clean 50 Ω signaling, use SN74HC241NS to drive a series-terminated driver (e.g., SN74LVC1G17) or add a 15 Ω series resistor at the output - validated in TI Application Report SCBA005B for bus reflection mitigation with SN74HC241NS.
What is the function of Pin 19 (2OE) on SN74HC241NS?
Pin 19 (2OE) is the active-high output enable input for the second 4-bit buffer section (2A0–2A3 → 2Y0–2Y3). When 2OE = HIGH, outputs 2Y0–2Y3 follow their respective inputs; when 2OE = LOW, those outputs enter high-impedance state. This complements Pin 1 (1OE, active-low) for the first section - enabling independent, asynchronous control of two 4-bit data paths within SN74HC241NS.
Is SN74HC241NS RoHS compliant and lead-free?
Yes, SN74HC241NS is RoHS compliant and lead-free. TI's packaging documentation confirms that the NS (SOIC) variant uses matte-tin lead finish and meets EU Directive 2011/65/EU requirements. The device carries the "Green" designation in TI's part numbering system, with no exemptions claimed - verified in TI's official SN74HC241 product folder and material content reports dated 2022 onward.
SN74HC241NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74HC241NS FAQ
1.How can I place an order for SN74HC241NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC241NS 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 SN74HC241NS reliable?
The price and inventory of SN74HC241NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC241NS is usually 5 days.
3.What payment methods are accepted for SN74HC241NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC241NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC241NS?
SN74HC241NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC241NS 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 SN74HC241NS?
For technical support, including SN74HC241NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC241NS requirements.
6.How does Aetrix verify that SN74HC241NS is sourced from the original manufacturer or authorized distributors?
All SN74HC241NS 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 SN74HC241NS meets industry standards.
7.What is the process for return or replacement of SN74HC241NS?
All SN74HC241NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC241NS, 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 SN74HC241NS part is unused and in its original packaging.
Return procedure for SN74HC241NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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