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Texas Instruments SN74AHCT541DW
- Part No.:
- SN74AHCT541DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHCT541DW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,551
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Product details
Overview
SN74AHCT541DW 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 digital systems. It features TTL-compatible inputs, ±8 mA output drive capability at VCC = 4.5–5.5 V, 6.5 ns max propagation delay (CL = 15 pF), and dual independent 3-state enables (OE1/OE2). It operates across –40°C to +125°C and is packaged in a 20-pin SOIC (DW) with 12.80 mm × 10.3 mm body size.
For engineers reviewing the SN74AHCT541DW datasheet, SN74AHCT541DW pinout, SN74AHCT541DW application, or SN74AHCT541DW equivalent, this page delivers verified electrical specs, functional mode logic, thermal resistance (RθJA = 81.1°C/W), ESD ratings (±2000 V HBM), and real-world layout guidance for high-density PCBs.
Technical Context
The SN74AHCT541DW implements two independent 4-bit groups (A1–A4/Y1–Y4 and A5–A8/Y5–Y8), each controlled by its own active-low 3-state enable (OE1, OE2). Its output-enable logic is a 2-input AND gate with inverted inputs: outputs enter high-impedance when either OE1 or OE2 is high. Inputs tolerate TTL voltage levels (VIL ≤ 0.8 V, VIH ≥ 2 V), ensuring compatibility with legacy 5-V logic families.
It uses standard CMOS silicon process with AHCT-series level-shifting characteristics, delivering rail-to-rail output swing (VOH ≥ 3.8 V, VOL ≤ 0.44 V at IO = ±8 mA) and low quiescent current (ICC ≤ 40 µA). The device supports mixed-signal board partitioning via opposite-side I/O placement-inputs on one side, outputs on the other-to minimize trace crosstalk and simplify routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation under typical 5-V supply tolerances and brown-out conditions. |
| Output Drive | ±8 mA - Sufficient to drive 50-pF loads with <9.5 ns propagation delay, supporting medium-speed bus loading. |
| tPLH/tPHL | 6.2 ns (max, CL = 50 pF) - Enables reliable timing in 80-MHz-equivalent data paths with margin. |
| VIH/VIL | 2.0 V / 0.8 V - Guarantees interoperability with standard TTL outputs without level shifters. |
| RθJA | 81.1°C/W (SOIC DW) - Determines thermal derating for continuous operation at ambient up to +125°C with ≤15 mW dissipation. |
| ESD Rating | ±2000 V HBM - Meets industrial handling requirements without additional protection circuitry. |
| IOFF (3-State) | ±2.5 µA - Minimizes leakage-induced bus contention during disable, critical for multi-driver buses. |
Pinout & Package
SN74AHCT541DW is housed in a 20-pin SOIC (DW) package with 12.80 mm × 10.3 mm footprint and 7.50 mm body width. Pin 1 is located at the top-left corner (quadrant Q1) when viewed from the top with the notch or dot oriented left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-state enables - Independently disable Y1–Y4 (OE1) or Y5–Y8 (OE2); tie to VCC via pull-up for power-up high-Z safety. |
| 2–9 | A1–A8 | Buffer inputs - TTL-compatible; must be terminated to VCC or GND if unused to prevent floating logic states. |
| 10 | GND | Ground reference - Primary return path for all I/O and supply currents; requires low-inductance connection to PCB ground plane. |
| 11–18 | Y1–Y8 | Non-inverting 3-state outputs - Drive external loads only when corresponding OE is low; high-Z state isolates bus segments. |
| 20 | VCC | Power supply - Requires local 0.1 µF ceramic bypass capacitor placed within 3 mm of pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts 0.8 V/2.0 V thresholds - Eliminates need for external level translators when interfacing with legacy 74LS or 74F devices. |
| Dual independent 3-state controls | OE1 and OE2 enable per-group isolation - Allows interleaved bus access between two 4-bit subsystems without contention. |
| Input/output separation | Inputs on left, outputs on right (top view) - Reduces layer count and crosstalk in dense PCB layouts by enabling straight-through routing. |
| Low dynamic power | 12 pF power-dissipation capacitance (Cpd) - Limits switching current and heat generation in high-frequency toggle applications. |
| Industrial temperature range | –40°C to +125°C operation - Supports deployment in automotive engine compartments, industrial PLCs, and outdoor embedded controllers. |
Applications
| Memory Address Buffering | Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Driving 8-bit address lines from a microcontroller to multiple SRAM or peripheral ICs on a shared bus. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-state control acts as address latch enabler, isolating inactive memory banks during read/write cycles. Use Value: Prevents address bus contention using OE1/OE2 to gate Y1–Y4 and Y5–Y8 independently, enabling bank-select arbitration without external logic. |
Use Scenario: Extending GPIO count of an MCU by adding parallel I/O ports via 8-bit data latching. IC Role / Device Role / Timing Role: Bidirectional bus driver (with external direction control) buffers data between MCU and peripheral peripherals like LCD controllers or ADCs. Use Value: ±8 mA drive strength ensures clean signal integrity over 10-cm PCB traces at 10 MHz, reducing need for repeaters or series termination. |
| Legacy System Interface | Industrial Control Backplane |
|
Use Scenario: Interfacing modern 5-V CMOS MCUs with older TTL-based instrumentation modules (e.g., GPIB adapters, DACs). IC Role / Device Role / Timing Role: Level-shifting buffer translating MCU logic levels to TTL-compatible thresholds while preserving signal polarity. Use Value: Guaranteed VIH = 2.0 V and VIL = 0.8 V ensure >1.0 V noise margin against TTL output variations, eliminating false triggering. |
Use Scenario: Isolating sensor input channels on a modular PLC backplane where multiple cards share a common data bus. IC Role / Device Role / Timing Role: 3-state bus driver enables hot-swap-safe card insertion by placing outputs in high-Z until firmware initializes the slot. Use Value: Low IOFF (±2.5 µA) prevents leakage-induced voltage drift on shared bus lines during card power-up sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/3-state driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT244DW | Two 4-bit non-inverting buffers with separate OE controls - identical pinout and electrical specs, but functionally identical to SN74AHCT541DW. | No functional difference; SN74AHCT244DW is a direct functional twin with same truth table and timing. | Select SN74AHCT244DW only if cross-referenced in legacy BOMs; SN74AHCT541DW remains TI's preferred ordering designation. |
| 74LVC244APW | 3.3-V-only operation (1.65–3.6 V), lower drive (±24 mA), faster tP (3.2 ns), and smaller TSSOP-20 package. | Requires level translation when used with 5-V systems; unsuitable for direct replacement without supply redesign. | Choose 74LVC244APW only for new 3.3-V designs prioritizing speed and density; not a drop-in substitute for SN74AHCT541DW. |
Compared with SN74AHCT541DW, SN74AHCT244DW offers identical functionality and pin compatibility for seamless BOM migration, while 74LVC244APW provides higher speed and lower voltage operation-but mandates full system-level voltage architecture review before substitution.
Availability
SN74AHCT541DW is available at Aetrix Electronics and suitable for industrial control backplanes, memory subsystems, and legacy interface bridging requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT541DW 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74AHCT541DW belongs to TI's 74AHCT logic family, engineered for robust 5-V TTL-to-CMOS interfacing in harsh environments-emphasizing noise immunity, wide temperature operation, and bus-contention safety.
FAQ
What is the maximum operating temperature for SN74AHCT541DW?
The SN74AHCT541DW is rated for continuous operation from –40°C to +125°C ambient temperature. This specification is validated per JEDEC JESD78 and applies to the SOIC (DW) package under recommended operating conditions (VCC = 4.5–5.5 V). Thermal derating is required above 85°C ambient if power dissipation exceeds 15 mW, based on its RθJA of 81.1°C/W.
Does SN74AHCT541DW support hot-swap applications?
SN74AHCT541DW supports hot-swap use cases only when OE1 and OE2 are held high (disabled) during insertion. Its ±2.5 µA off-state leakage ensures minimal bus disturbance, but the device lacks powered-off protection diodes. For true hot-swap compliance, external series resistors and TVS clamps are recommended-TI does not guarantee bus fault tolerance during live insertion without supplemental circuitry.
Can SN74AHCT541DW drive a 50-pF load at 10 MHz?
Yes. SN74AHCT541DW delivers 6.2 ns max tPLH/tPHL into 50-pF loads at VCC = 5 V, supporting reliable 10-MHz square-wave transmission with >40% duty-cycle margin. Its ±8 mA output drive ensures <1 V undershoot/overshoot on 50-Ω-terminated lines, provided layout follows TI's guidelines for short traces and local bypassing.
Is SN74AHCT541DW pin-compatible with SN74LS541N?
No. While both are octal 3-state buffers, SN74AHCT541DW (SOIC-20) and SN74LS541N (PDIP-20) share identical pin functions but differ in package dimensions, thermal characteristics, and drive strength. SN74LS541N draws significantly higher supply current and lacks TTL-compatible inputs-direct PCB replacement requires verification of layout clearance, thermal vias, and power delivery.
What is the recommended bypass capacitor for SN74AHCT541DW?
Texas Instruments specifies a 0.1 µF ceramic capacitor placed within 3 mm of the VCC pin (pin 20) and GND (pin 10) for SN74AHCT541DW. This value targets high-frequency noise suppression (10–100 MHz). For systems with multiple SN74AHCT541DW units, add a bulk 1–10 µF tantalum or aluminum electrolytic capacitor per power rail segment to stabilize low-frequency ripple.
SN74AHCT541DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
SN74AHCT541DW FAQ
1.How can I place an order for SN74AHCT541DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT541DW 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 SN74AHCT541DW reliable?
The price and inventory of SN74AHCT541DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT541DW is usually 5 days.
3.What payment methods are accepted for SN74AHCT541DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT541DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT541DW?
SN74AHCT541DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT541DW 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 SN74AHCT541DW?
For technical support, including SN74AHCT541DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT541DW requirements.
6.How does Aetrix verify that SN74AHCT541DW is sourced from the original manufacturer or authorized distributors?
All SN74AHCT541DW 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 SN74AHCT541DW meets industry standards.
7.What is the process for return or replacement of SN74AHCT541DW?
All SN74AHCT541DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT541DW, 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 SN74AHCT541DW part is unused and in its original packaging.
Return procedure for SN74AHCT541DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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