SN74HCS541PWR - Octal Buffer Schmitt 3-State TSSOP-20 | TI
MPN: SN74HCS541PWR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.42 | $0.42 |
| 10 | $0.38 | $3.80 |
| 100 | $0.31 | $31.00 |
| 500 | $0.27 | $135.00 |
| 1,000 | $0.22 | $220.00 |
SN74HCS541PWR Overview
What is an octal buffer/line driver? It is a digital logic IC providing eight independent buffer channels capable of driving bus lines or long PCB traces. The 3-state outputs allow each device to release the bus into a high-impedance state, enabling multi-device bus sharing, while Schmitt-trigger inputs add hysteresis that converts slow or noisy input edges into clean logic transitions. The SN74HCS541 belongs to the HCS (High-speed CMOS with Schmitt-trigger) logic family, combining CMOS low power with TTL-compatible drive.
Key features include the 2 V to 6 V operating range for 3.3 V and 5 V mixed-voltage systems, typical 0.4 V input hysteresis at 4.5 V for superior noise immunity, dual active-low output enables (OE1 and OE2, both must be low to activate outputs), and only 20 uA typical quiescent current at 6 V. Outputs sink or source up to 6 mA at 4.5 V, suitable for driving LEDs, relays, or additional logic inputs.
Fabricated in silicon-gate CMOS, the device balances switching speed with low power dissipation. The flow-through pinout places inputs on one side and outputs on the opposite side, simplifying PCB routing and reducing crosstalk in bus-oriented layouts.
Typical applications include microcontroller bus buffering, memory address/data line driving, sensor signal conditioning, and interfacing 3.3 V logic to 5 V domains in industrial automation and automotive-adjacent systems.
Design tip: control the OE pins carefully to avoid bus contention, place 0.1 uF decoupling capacitors close to VCC/GND, and keep input rise times below 500 ns at 2 V and 200 ns at 6 V for best performance.
Drop-in alternatives for SN74HCS541PWR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with SN74HCS541PWR (same form factor and footprint) — differing in Function, Output Enable, Output Type, Packaging.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SN74HCS541QPWRQ1
✅ Drop-In✓ In Stock
$0.3 / Unit
View Datasheet →SN74HC541PWR
✅ Drop-In📋 Reference alternative (not in catalog)
SN74HCS595PWR
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
74HC541PW,112
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SN74HCS541PWR Maximum Ratings & Electrical Characteristics
| Function | Octal buffer / line driver |
| Input Type | Schmitt-trigger |
| Logic Family | HCS (High-speed CMOS Schmitt) |
| Channels | 8-bit per element, 1 element |
| Output Type | 3-state, non-inverting |
| Supply Voltage Range | 2 V to 6 V |
| Input Hysteresis | 0.4 V typical at 4.5 V |
| Output Drive Current | 6 mA at 4.5 V (sink and source) |
| Quiescent Current | 20 uA typical at 6 V |
| Output Enable | OE1 and OE2, both active-low |
| Operating Temperature | -40C to +125C |
| Package | 20-TSSOP (PW) |
| Mounting Type | Surface Mount |
| Pinout Style | Flow-through |
| RoHS Status | Compliant |
| Packaging | Tape & Reel (PWR suffix) |
SN74HCS541PWR Pin Configuration
| Pin 1 | OE1 — Output enable 1 (active low) |
| Pin 2 | A1 — Data input 1 |
| Pin 3 | A2 — Data input 2 |
| Pin 4 | A3 — Data input 3 |
| Pin 5 | A4 — Data input 4 |
| Pin 6 | A5 — Data input 5 |
| Pin 7 | A6 — Data input 6 |
| Pin 8 | A7 — Data input 7 |
| Pin 9 | A8 — Data input 8 |
| Pin 10 | GND — Ground |
| Pin 11 | Y1 — Buffered output 1 (3-state) |
| Pin 12 | Y2 — Buffered output 2 (3-state) |
| Pin 13 | Y3 — Buffered output 3 (3-state) |
| Pin 14 | Y4 — Buffered output 4 (3-state) |
| Pin 15 | Y5 — Buffered output 5 (3-state) |
| Pin 16 | Y6 — Buffered output 6 (3-state) |
| Pin 17 | Y7 — Buffered output 7 (3-state) |
| Pin 18 | Y8 — Buffered output 8 (3-state) |
| Pin 19 | OE2 — Output enable 2 (active low) |
| Pin 20 | VCC — Supply voltage, 2 V to 6 V |
Typical Applications
SN74HCS541PWR is suitable for 6 applications: Microcontroller Bus Buffering, Memory Address and Data Line Driving, Slow Signal Conditioning in Industrial Automation, 3.3 V to 5 V Logic Domain Interfacing, LED and Relay Drive Strobing, Automotive-Adjacent Control Systems.
Microcontroller Bus Buffering
The SN74HCS541PWR buffers eight address or data lines between an MCU and shared peripherals. Its 6 mA drive at 4.5 V strengthens weakened signals on long PCB traces, while the dual active-low enables let a second device share the same bus via high-impedance outputs. Schmitt-trigger inputs tolerate ringing on longer interconnects. Place 0.1 uF decoupling close to VCC and use the flow-through pinout to keep traces short and crosstalk low.
Recommended
Memory Address and Data Line Driving
When interfacing parallel memories or external latches, the SN74HCS541PWR drives address lines from a controller with clean, fast edges. The 2 V to 6 V range supports both 3.3 V and 5 V memory systems. Outputs default to high-impedance when either OE pin is high, enabling power-up tri-state during MCU reset. Evaluate propagation delay budget at your operating voltage when adding buffers to address paths.
Recommended
Slow Signal Conditioning in Industrial Automation
Industrial sensor outputs, RC timers, and optocoupler outputs often have rise times in the microseconds - too slow for standard CMOS inputs, which can oscillate in the threshold region. The SN74HCS541PWR's Schmitt-trigger inputs, with 0.4 V typical hysteresis at 4.5 V, snap these edges into clean logic levels while the 3-state outputs let one processor at a time read the conditioned lines. Keep rise times within the datasheet limits and decouple VCC locally.
Recommended
3.3 V to 5 V Logic Domain Interfacing
Operating up to 6 V, the SN74HCS541PWR accepts 3.3 V logic levels from a low-voltage MCU and drives 5 V logic or loads. Its CMOS thresholds scale with VCC, and Schmitt hysteresis remains effective across the range. Typical use is translating control or data lines from a 3.3 V processor into 5 V industrial I/O or legacy TTL subsystems, using the 3-state outputs for bus sharing during handoff.
Recommended
LED and Relay Drive Strobing
With 6 mA sink/source capability at 4.5 V per output, the SN74HCS541PWR directly drives LED indicators through resistors or small transistor drivers for relays. The eight independent channels with a common enable pair allow banked strobing: both OE pins low to enable the group, high to blank all outputs simultaneously. Schmitt inputs ensure clean strobe edges from noisy controller lines.
Recommended
Automotive-Adjacent Control Systems
For non-safety automotive-adjacent equipment such as test fixtures and factory controllers in vehicle plants, the standard SN74HCS541PWR works to -40C to +125C. When AEC-Q100 qualification is required, the SN74HCS541QPWRQ1 drops into the same footprint with identical function. The wide 2 V to 6 V range tolerates regulated 5 V rails with headroom for transient sag, and the 20 uA quiescent current suits low-power standby nodes.
Recommended
Recommended Products Summary
Engineering reference data for SN74HCS541PWR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74HCS541QPWRQ1 | SN74HC541PWR | 74HC541PW,112 | MC74HC541ADWG |
|---|---|---|---|---|---|
| Package | 20-TSSOP (PW) | 20-TSSOP (PW) - same | 20-TSSOP (PW) - same | 20-TSSOP (PW) - same | SOIC-20 wide - different |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors | Microchip Technology |
| Schmitt-Trigger Inputs | Yes (0.4 V typ hysteresis at 4.5 V) | Yes | No | No | No |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V |
| Output Drive | 6 mA at 4.5 V | 6 mA at 4.5 V | 6 mA at 4.5 V | 6 mA at 4.5 V | 6 mA at 4.5 V |
| Automotive Grade | No | Yes (AEC-Q100) | No | No | No |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +85C |
Key Differentiators
- Schmitt-trigger inputs for noisy/slow signals (vs SN74HC541PWR)
- Automotive drop-in variant available (vs SN74HCS541QPWRQ1)
- Cross-brand equivalents lack hysteresis (vs 74HC541PW,112)
Design Notes
Never enable outputs while another bus driver is active - bus contention can exceed the absolute maximum output current. Sequence OE1/OE2 so a new driver enables only after the previous driver has tri-stated. During MCU reset, hold both OE pins high (pull-ups recommended) so outputs remain high-impedance until the controller is ready.
Place a 0.1 uF ceramic decoupling capacitor within 3 mm of the VCC (pin 20) and GND (pin 10) pins, with an additional bulk 1 uF to 10 uF per board region. The flow-through pinout lets inputs and outputs route on opposite board sides - keep input and output traces separated to reduce crosstalk on parallel bus lines.
Respect the maximum recommended input transition (rise/fall) times - roughly 500 ns at 2 V and 200 ns at 6 V per the HCS family datasheet - unless using the Schmitt-trigger inputs of this HCS version. Unused inputs must not float: tie them to VCC or GND to avoid increased quiescent current and oscillation.
Compliance Information
RoHS compliant per TI product page. Use SN74HCS541QPWRQ1 for AEC-Q100 qualified automotive designs.
