SN74HCT541PWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74HCT541PWG4 is an octal buffer and line driver from Texas Instruments in the HCT CMOS logic family, featuring 3-state outputs and dual active-low output-enable controls in a 20-pin TSSOP package. It accepts TTL-compatible input levels while operating from a 4.5 V to 5.5 V supply, propagating signals with a typical delay of 10 ns at 5 V. Designed for bus driving, address buffering, and signal isolation in TTL-to-CMOS interface applications.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HCT541PWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74HCT541PWG4?
- Octal (8-bit) non-inverting buffer with 3-state outputs for bus multiplexing
- TTL-compatible input thresholds: VIL = 0.8 V, VIH = 2.0 V for direct 5 V TTL interfacing
- Dual active-low output enable (OE1, OE2) for independent half-bus gating
- High output drive: ±8 mA IOH/IOL enabling direct drive of 50 Ω transmission lines
- Typical propagation delay of 10 ns at 5 V supply, 150 pF load
- 20-pin TSSOP package for compact SMD bus driver placement
What is SN74HCT541PWG4 used for?
The SN74HCT541PWG4 is commonly used as an address or data bus buffer between a microprocessor and memory or peripheral devices in 5 V TTL-based embedded systems, preventing bus loading and signal degradation over long PCB traces. It also serves as a signal isolator in data acquisition cards, PCI/ISA bus interfaces, and industrial control backplanes where bidirectional bus switching and 3-state isolation are required.
What are the specifications of SN74HCT541PWG4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | WITH DUAL OUTPUT ENABLE |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | HCT |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 150pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.006A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP20,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.08mA |
| Prop. Delay@Nom-Sup | 29ns |
| Propagation Delay (tpd) | 42ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Malaysia |
Where can I find the SN74HCT541PWG4 datasheet?
SN74HCT541PWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74HCT541PWG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the SN74HCT541PWG4 differ from the 74HC541 in terms of input compatibility?
The SN74HCT541PWG4 (HCT family) has TTL-compatible input thresholds: VIL = 0.8 V and VIH = 2.0 V, designed to accept signals directly from 5 V TTL devices. In contrast, the 74HC541 uses CMOS input thresholds (VIH = 3.5 V at 5 V VCC), which may not reliably accept standard TTL high levels near 2.4 V. When interfacing legacy TTL buses to CMOS logic at 5 V, the HCT variant is the correct choice.
What output drive strength does the SN74HCT541PWG4 provide, and can it drive a 50 Ω bus trace?
The SN74HCT541PWG4 output can source and sink ±8 mA (IOH and IOL). When driving a 50 Ω terminated transmission line at 5 V, the output can sustain a valid high level across the termination, making it suitable for backplane bus drivers and PCB traces longer than 10 cm where impedance matching is needed. The 150 pF rated load confirms compatibility with moderate capacitive bus loads.
How are the dual output-enable pins used to gate only half of the 8-bit bus?
The SN74HCT541PWG4 has two separate active-low output-enable inputs (OE1 and OE2) that both must be asserted low to enable all 8 outputs. If either enable is high, all 8 outputs go to high-impedance 3-state mode. While this configuration does not independently gate individual 4-bit nibbles, the two enables allow the device to be placed in high-impedance state by deassering either control line, which is useful for OR-tied bus arbitration with multiple drivers on the same bus.
What is the propagation delay of the SN74HCT541PWG4, and does it meet timing requirements for 33 MHz bus cycles?
The SN74HCT541PWG4 typical propagation delay is 10 ns at 5 V with a 150 pF load, and the maximum specified tpd is approximately 15 ns. For a 33 MHz bus cycle with a period of 30 ns, this delay consumes about 50% of the cycle time, which is generally acceptable. For 66 MHz or faster buses, a faster logic family such as 74ALVC or 74LVT would be more appropriate to leave adequate setup and hold time margins.
In what package does the SN74HCT541PWG4 come, and is it compatible with automated assembly?
The SN74HCT541PWG4 is packaged in a 20-pin TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, measuring approximately 6.5 mm × 4.4 mm. The surface-mount TSSOP is fully compatible with standard SMT pick-and-place machines and reflow soldering. The G4 suffix indicates green (RoHS-compliant, halogen-free) packaging suitable for modern eco-compliance requirements in production PCB assembly.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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