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Texas Instruments SN74AHCT541DWRE4
- Part No.:
- SN74AHCT541DWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHCT541DWRE4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,064
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Product details
Overview
SN74AHCT541DWRE4 from Texas Instruments is an octal non-inverting buffer/driver with 3-state outputs, designed for bus line driving and memory address register buffering in 5-V TTL-compatible digital systems. It features dual independent output-enable inputs (OE1, OE2), 20-pin TSSOP package, ±8 mA output drive capability at VCC = 4.5–5.5 V, and operates across –40°C to +125°C.
For engineers reviewing the SN74AHCT541DWRE4 datasheet, SN74AHCT541DWRE4 pinout, SN74AHCT541DWRE4 application, or SN74AHCT541DWRE4 equivalent, key selection criteria include 3-state control logic, TTL-input compatibility, propagation delay ≤6.5 ns (CL = 15 pF), thermal resistance RθJA = 116.8°C/W, and RoHS-compliant NIPDAU lead finish.
Technical Context
The SN74AHCT541DWRE4 implements two groups of four-channel non-inverting buffers, each controlled by a dedicated active-low output-enable input (OE1/OE2). Its 3-state outputs are driven by totem-pole logic with defined VOH ≥3.8 V and VOL ≤0.44 V under IOL/IOH = ±8 mA conditions at VCC = 4.5–5.5 V.
Input structure is TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V), enabling direct interfacing with legacy 5-V TTL logic. The device supports bidirectional bus isolation via independent enable control, and its pinout places all eight inputs on one side and eight outputs on the opposite side to simplify PCB routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across industrial-grade 5-V supply tolerances |
| Output Drive | ±8 mA - sufficient to drive standard TTL loads and moderate-capacitance buses without external buffering |
| tPLH / tPHL | ≤6.5 ns (CL = 15 pF) - enables reliable timing in high-speed address/data latching up to ~100 MHz |
| VOH / VOL | ≥3.8 V / ≤0.44 V at ±8 mA - guarantees robust noise margins against TTL and CMOS logic thresholds |
| Operating Temp | –40°C to +125°C - qualified for extended-temperature industrial and automotive under-hood applications |
| ESD Rating | ±2000 V HBM - meets JEDEC JS-001 for handling in standard manufacturing environments |
| ICC (Quiescent) | ≤40 µA - minimizes standby power in battery-backed or low-power system states |
Pinout & Package
SN74AHCT541DWRE4 uses a 20-pin Thin Shrink Small Outline Package (TSSOP), body size 6.50 mm × 4.40 mm, with gull-wing leads and RoHS-compliant NIPDAU plating. Pin 1 is located in quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output-enable controls for two independent 4-bit buffer groups; both must be low for corresponding outputs to drive |
| 2–9 | A1–A8 | Non-inverting data inputs; TTL-compatible thresholds allow direct connection to legacy 5-V logic families |
| 10 | GND | Ground reference for all internal circuitry and output stage return path |
| 11–18 | Y1–Y8 | 3-state non-inverting outputs; high-impedance when OE1 or OE2 is high, eliminating bus contention |
| 20 | VCC | Positive supply rail; requires local 0.1 µF bypass capacitor placed adjacent to pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| TTL-input compatibility | VIH = 2 V, VIL = 0.8 V - eliminates need for level-shifting when interfacing with 74LS, 74F, or other 5-V TTL sources |
| Dual independent 3-state control | Separate OE1/OE2 pins - enables selective activation of two 4-bit data lanes for flexible bus partitioning |
| Low propagation skew | tsk(o) ≤1 ns - ensures simultaneous edge alignment across all eight outputs for synchronous address/data transfer |
| High ESD immunity | ±2000 V HBM, ±1000 V CDM - reduces field failure risk during assembly and end-user handling |
| Industrial temperature range | –40°C to +125°C operation - supports deployment in motor control, PLC, and transportation electronics |
Applications
| Memory Address Buffering | Microcontroller Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to external SRAM or flash memory. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-state outputs isolates MCU address bus during memory read/write cycles. Use Value: Prevents bus contention during multi-master arbitration and maintains signal integrity over 10-cm PCB traces at 20-MHz address strobe rates. |
Use Scenario: Interfacing an 8-bit MCU GPIO port to a peripheral with 5-V tolerant inputs. IC Role / Device Role / Timing Role: Level-translating driver that converts MCU's 5-V CMOS outputs to TTL-compatible drive strength. Use Value: Delivers guaranteed 8-mA sink/source current to meet peripheral VIH/VIL thresholds without external pull-ups or discrete transistors. |
| Industrial I/O Expansion | Legacy System Bus Isolation |
Use Scenario: Expanding digital I/O count in programmable logic controllers using parallel backplane buses. IC Role / Device Role / Timing Role: Octal buffer with dual OE control enables time-multiplexed access to shared I/O registers. Use Value: Allows two independent I/O modules to share one 8-bit data bus while maintaining electrical isolation and timing coherence. |
Use Scenario: Isolating aging TTL-based instrumentation subsystems from modern 3.3-V FPGA control logic. IC Role / Device Role / Timing Role: Bidirectional bus buffer with 3-state outputs prevents back-driving during FPGA configuration or reset sequences. Use Value: Eliminates need for discrete MOSFET switches or complex voltage translators while preserving nanosecond-level timing alignment. |
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 |
|---|---|---|---|
| SN74AHCT244PWRE4 | Two separate 4-bit non-inverting buffers with common OE per group; identical VCC, speed, and drive specs | Same functional behavior but different pinout - A/B-side inputs/outputs grouped separately instead of interleaved | Select when board layout benefits from symmetrical input/output placement or when consolidating multiple AHCT244-based designs |
| 74LVC244APW,118 | 3.3-V only operation (1.65–3.6 V), lower VOH/VOL, higher speed (tPD ≈ 3.2 ns), and 5-V tolerant inputs | Requires level translation for 5-V systems; unsuitable for pure 5-V TTL environments without interface circuitry | Prefer for new 3.3-V designs where lower power and higher speed outweigh compatibility with legacy 5-V logic |
Compared with SN74AHCT541DWRE4, SN74AHCT244PWRE4 offers identical electrical performance and temperature range but differs in pin assignment and labeling convention, whereas 74LVC244APW,118 targets modern low-voltage systems and lacks native 5-V operation - making it incompatible without additional voltage translation.
Availability
SN74AHCT541DWRE4 is available at Aetrix Electronics and suitable for industrial automation, motor control, and legacy system upgrades requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74AHCT541DWRE4 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 decades of heritage in industry-standard logic families.
SN74AHCT541DWRE4 belongs to the SNx4AHCT advanced high-speed CMOS logic series, engineered for seamless interoperability with TTL systems while delivering improved noise immunity and power efficiency over older 74LS/74F families.
FAQ
What is the maximum clock frequency supported by SN74AHCT541DWRE4 in bus-driving applications?
SN74AHCT541DWRE4 does not operate on a clock signal-it is a combinatorial buffer. Its usable data rate depends on propagation delay and load capacitance: with CL = 15 pF, tPLH/tPHL ≤6.5 ns supports reliable operation up to ~100 MHz for address/data strobing. For sustained 20-MHz bus cycling, timing margins remain robust due to low skew (tsk(o) ≤1 ns).
Can SN74AHCT541DWRE4 interface directly with 3.3-V microcontrollers?
SN74AHCT541DWRE4 inputs are TTL-compatible (VIH = 2 V min), so a 3.3-V MCU's high output (~3.3 V) exceeds the required VIH and will reliably assert logic high. However, its outputs swing rail-to-rail (0–5 V), so direct connection to 3.3-V-only inputs risks overvoltage damage unless those inputs are 5-V tolerant. Always verify downstream IC input voltage ratings before interconnection.
Is SN74AHCT541DWRE4 pin-compatible with SN74AHCT541PWR?
Yes-SN74AHCT541DWRE4 and SN74AHCT541PWR share identical TSSOP-20 (PW) package dimensions, pinout, and electrical specifications. The "E4" suffix denotes TI's legacy RoHS-compliance marking variant; both parts use NIPDAU lead finish, Level-1 MSL rating, and operate across –40°C to +125°C.
How should unused inputs be handled on SN74AHCT541DWRE4?
All unused inputs on SN74AHCT541DWRE4 must be tied to a valid logic level-either VCC or GND-to prevent floating nodes that cause increased ICC, erratic switching, or EMI. Inputs tied to VCC satisfy VIH requirements; tying to GND satisfies VIL. Do not leave any A1–A8 or OE1/OE2 pins unconnected, even if functionally inactive in the design.
Does SN74AHCT541DWRE4 require external pull-up resistors on OE pins?
OE1 and OE2 are active-low inputs; to ensure outputs remain in high-impedance state during power-up/power-down, TI recommends connecting each OE pin to VCC via a pull-up resistor. Minimum value depends on the driving source's sink capability-typically 10 kΩ suffices for most microcontroller GPIOs configured as open-drain or weak pull-down outputs.
SN74AHCT541DWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHCT541DWRE4 FAQ
1.How can I place an order for SN74AHCT541DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT541DWRE4 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 SN74AHCT541DWRE4 reliable?
The price and inventory of SN74AHCT541DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT541DWRE4 is usually 5 days.
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SN74AHCT541DWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT541DWRE4 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 SN74AHCT541DWRE4?
For technical support, including SN74AHCT541DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT541DWRE4 requirements.
6.How does Aetrix verify that SN74AHCT541DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT541DWRE4 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 SN74AHCT541DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74AHCT541DWRE4?
All SN74AHCT541DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT541DWRE4, 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 SN74AHCT541DWRE4 part is unused and in its original packaging.
Return procedure for SN74AHCT541DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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