SN74HCS541PWR - Octal Buffer, Schmitt-Trigger, 2-6V | TI
MPN: SN74HCS541PWR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.55 | $0.55 |
| 10 | $0.5 | $5.00 |
| 100 | $0.42 | $42.00 |
| 500 | $0.38 | $190.00 |
| 1,000 | $0.34 | $340.00 |
Drop-in alternatives for SN74HCS541PWR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SN74HC541PWR
β Drop-Inπ Reference alternative (not in catalog)
CD74HC541PW
β Drop-Inπ Reference alternative (not in catalog)
SN74AHCT541PWR
β Drop-Inπ Reference alternative (not in catalog)
74HC541PW,112
β Drop-Inπ Reference alternative (not in catalog)
MC74HC541ADTR2G
β Drop-Inπ Reference alternative (not in catalog)
SN74HCS541PWR Maximum Ratings & Electrical Characteristics
| Function | Octal buffer / line driver |
| Logic Family | HCS (HC with Schmitt-trigger inputs) |
| Number of Channels | 8 |
| Input Type | Schmitt-trigger |
| Output Type | 3-state, non-inverting |
| Supply Voltage Range | 2 V to 6 V |
| Input Hysteresis (typ) | 0.4 V at 4.5 V |
| Output Drive | 6 mA at 4.5 V (sink/source) |
| Quiescent Current (typ) | 20 uA at 6 V |
| Output Enable | OE1 and OE2, active-low (both must be low) |
| Operating Temperature | -40C to +125C |
| Pinout | Flow-through |
| Package | 20-TSSOP (PW) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (PWR suffix) |
| RoHS Status | Compliant |
| Max Input Rise Time | 500 ns at 2 V / 200 ns at 6 V (recommended) |
SN74HCS541PWR Pin Configuration
| Pin 1 | OE1 β Output enable 1, active-low; both OE must be low for outputs active |
| Pin 2 | 1A1 β Input channel 1 |
| Pin 3 | 2A1 β Input channel 2 |
| Pin 4 | 3A1 β Input channel 3 |
| Pin 5 | 4A1 β Input channel 4 |
| Pin 6 | GND β Ground |
| Pin 7 | 1Y1 β Output channel 1 (3-state) |
| Pin 8 | 2Y1 β Output channel 2 (3-state) |
| Pin 9 | 3Y1 β Output channel 3 (3-state) |
| Pin 10 | 4Y1 β Output channel 4 (3-state) |
| Pin 11 | 5Y2 β Output channel 5 (3-state) |
| Pin 12 | 6Y2 β Output channel 6 (3-state) |
| Pin 13 | 7Y2 β Output channel 7 (3-state) |
| Pin 14 | 8Y2 β Output channel 8 (3-state) |
| Pin 15 | GND β Ground |
| Pin 16 | 5A2 β Input channel 5 |
| Pin 17 | 6A2 β Input channel 6 |
| Pin 18 | 7A2 β Input channel 7 |
| Pin 19 | 8A2 β Input channel 8 |
| Pin 20 | OE2 β Output enable 2, active-low; plus VCC assignment per datasheet - verify datasheet pinout diagram |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
SN74HCS541PWR is suitable for 6 applications: Microcontroller Bus Buffering, Slow Signal / Sensor Edge Conditioning, Industrial Automation I/O, Memory Address and Data Line Driving, 3.3 V to 5 V Logic Domain Interfacing, LED and Indicator Driving.
Microcontroller Bus Buffering
The SN74HCS541PWR buffers address, data, or control buses from microcontrollers, its 6 mA drive at 4.5 V sourcing far more current than typical MCU GPIO pins (4-8 mA shared across banks). The flow-through TSSOP-20 pinout places inputs directly opposite outputs, minimizing trace crossings and crosstalk in dense layouts. Dual active-low OE pins allow two control signals to gate the whole bus, supporting safe bus arbitration. Place 0.1 uF decoupling at VCC to handle switching transients of eight simultaneous outputs.
Recommended
Slow Signal / Sensor Edge Conditioning
With 0.4 V typical hysteresis at 4.5 V, the Schmitt-trigger inputs of the SN74HCS541PWR convert slow RC-charged or noisy sensor edges into clean, fast logic transitions without external comparator circuitry. This suits photointerrupter outputs, analog comparator raw outputs, and long cable arrivals susceptible to ringing. Signals up to 500 ns rise time at 2 V and 200 ns at 6 V are reliably retimed per the TI datasheet. Standard HC541 parts without Schmitt inputs may oscillate on the same slow edges.
Recommended
Industrial Automation I/O
Operating from -40C to +125C over a 2 V to 6 V supply, the SN74HCS541PWR suits PLC I/O modules and factory control boards that must tolerate wide ambient conditions. The 3-state outputs isolate the buffer from shared backplane buses when either OE pin is deasserted, and 20 uA typical ICC keeps module standby power low. Its Schmitt inputs reject noise coupled from nearby motor drives and relays, improving field-wiring robustness in electrically harsh industrial cabinets.
Recommended
Memory Address and Data Line Driving
The SN74HCS541PWR drives memory address and data buses, where its 3-state outputs enable multiple bus masters to share common lines. Eight channels in one TSSOP-20 save board area versus discrete buffers. The flow-through pinout maps cleanly onto memory bus routing. Ensure both OE1 and OE2 are asserted before the memory access window and released to high-Z promptly to avoid bus contention during read/write turnaround; CMOS drive of 6 mA at 4.5 V handles typical trace loads up to several hundred pF within standard memory timing budgets.
Recommended
3.3 V to 5 V Logic Domain Interfacing
With HC-family CMOS input thresholds scaling with supply and a 2 V to 6 V range, the SN74HCS541PWR can interface 3.3 V logic outputs into a 5 V buffered domain, since 3.3 V exceeds the HC VIH minimum (about 3.15 V at VCC=4.5 V worst case - verify headroom in the datasheet). This makes it useful in mixed-voltage legacy industrial boards. For guaranteed TTL-threshold translation, the SN74AHCT541 is an alternative, but it lacks the Schmitt hysteresis that the HCS541 provides for noisy crossovers.
Recommended
LED and Indicator Driving
The 6 mA sink/source capability at 4.5 V lets each SN74HCS541PWR output drive status LEDs (with series resistors) or low-power indicator loads directly from logic outputs, eliminating discrete transistors for modest current needs. Eight channels give a full status byte per package. The 3-state outputs allow test-mode disconnect of all indicators via the OE pins. Note total package current limits - verify the datasheet continuous current through VCC/GND pins when multiple LEDs are on simultaneously, and account for TSSOP thermal limits at high ambient temperature.
Recommended
Recommended Products Summary
Engineering reference data for SN74HCS541PWR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74HC541PWR | CD74HC541PW | 74HC541PW,112 |
|---|---|---|---|---|
| Package | 20-TSSOP (PW) | 20-TSSOP (PW) - same | 20-TSSOP (PW) - same | 20-TSSOP (PW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors |
| Input Type | Schmitt-trigger | Standard HC | Standard HC | Standard HC |
| Supply Voltage | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V |
| Output Type | 3-state, non-inverting | 3-state, non-inverting | 3-state, non-inverting | 3-state, non-inverting |
| 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 |
| Input Hysteresis | 0.4 V typ at 4.5 V | None | None | None |
| Operating Temperature | -40C to +125C | -40C to +125C | [DATA_NEEDED] | [DATA_NEEDED] |
| Quiescent Current | 20 uA typ at 6 V | [DATA_NEEDED] (CMOS, similar) | [DATA_NEEDED] | [DATA_NEEDED] |
| Price (1 pc, approx) | $0.55 as of 2026-08-29 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Schmitt-trigger inputs for noise immunity (vs SN74HC541PWR)
- Dual output enables for bus safety (vs SN74HC541PWR)
- Trade-off: no TTL-threshold variant with Schmitt inputs (vs SN74AHCT541PWR)
Design Notes
Decouple VCC with a 0.1 uF ceramic capacitor placed within a few millimeters of the VCC pin, plus bulk capacitance near the board supply. When all eight outputs switch simultaneously driving capacitive bus loads, dynamic ICC spikes can exceed the 20 uA static figure by orders of magnitude; undersized decoupling causes ground bounce and output glitches.
Both OE1 and OE2 must be low for outputs to drive; a floating OE pin can leave outputs unpredictably in high-Z. Tie unused OE pins to GND with a pulldown, and never allow two bus drivers to assert simultaneously - sequence bus turnaround with at least one dead cycle to prevent contention currents that can exceed abs-max ratings.
The flow-through pinout lets you route all inputs on one side of the TSSOP and outputs on the other - keep a clean partition so noisy input lines do not run parallel to outputs. For Schmitt-input benefit, keep analog/slow source impedance reasonable; hysteresis handles slow edges but cannot reject noise exceeding the 0.4 V typical window at 4.5 V.
Respect the recommended input transition rates: 500 ns max at 2 V and 200 ns max at 6 V. Although Schmitt inputs tolerate slow edges far better than standard HC inputs, excessively slow signals with supply noise beyond the hysteresis window can still cause multiple transitions. For very long cables, add series termination (22-33 ohm) at the driver outputs.
Compliance Information
RoHS compliance per TI catalog listing; REACH and halogen details not present in provided data - [DATA_NEEDED].
