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Texas Instruments SN74HC541DW
- Part No.:
- SN74HC541DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC541DW.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,042
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Product details
Overview
SN74HC541DW from Texas Instruments is an octal non-inverting 3-state buffer/line driver IC used for bus interfacing and signal isolation in digital systems. It operates from 2 V to 6 V, delivers ±6 mA output drive at 5 V, features typical propagation delay of 10 ns (VCC = 6 V, CL = 50 pF), and supports high-current 3-state outputs capable of driving up to 15 LSTTL loads directly - commonly deployed in PC motherboard I/O buffering and industrial control backplanes.
For engineers reviewing the SN74HC541DW datasheet, SN74HC541DW pinout, SN74HC541DW application, or SN74HC541DW equivalent, key selection criteria include its dual active-low output-enable architecture (OE1/OE2), data-flow-through SOIC-20 pinout optimized for PCB layout, low 80 µA maximum ICC quiescent current, and guaranteed operation across –40°C to +85°C industrial temperature range.
Technical Context
The SN74HC541DW implements eight independent non-inverting buffers with complementary NOR-gated 3-state control: both OE1 and OE2 must be low to enable Y outputs; either high forces all eight outputs into high-impedance state. Its CMOS design ensures rail-to-rail input compatibility and symmetric VOH/VOL performance across the full 2–6 V supply range.
Input and output pins are physically segregated on opposite sides of the SOIC-20 package (pins 1–9 & 19–20 vs. 11–18), enabling straight-through PCB trace routing and minimizing crosstalk. The device exhibits 10 pF typical input capacitance and 35 pF typical power-dissipation capacitance per channel, supporting stable switching up to 20 MHz under 50 pF load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables direct interface with 3.3 V and 5 V logic families without level shifters. |
| Output Drive Capability | ±6 mA at VCC = 5 V - sufficient to drive 15 LSTTL loads or directly source/sink LEDs. |
| Propagation Delay (tpd) | 10 ns typical at VCC = 6 V, CL = 50 pF - supports reliable timing in 20+ MHz bus applications. |
| Quiescent Current (ICC) | 80 µA maximum - minimizes standby power in battery-backed or energy-sensitive systems. |
| Input Leakage Current | ±1 µA maximum - ensures robust noise immunity and predictable logic thresholds over temperature. |
| 3-State Enable Logic | NOR-gated dual OE (OE1, OE2) - provides redundant disable control and simplifies bus arbitration logic. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and computing applications. |
Pinout & Package
SN74HC541DW is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with gull-wing leads and standard JEDEC MS-013 outline. The pinout follows a data-flow-through arrangement: inputs (A1–A8, OE1, OE2) occupy one side, outputs (Y1–Y8) and power pins (VCC, GND) the opposite side - optimizing PCB layout for parallel bus routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs - both must be low for Y1–Y8 to reflect A1–A8; either high places all outputs in high-Z. |
| 2–9 | A1–A8 | Buffer input channels - true (non-inverting) logic inputs referenced to VCC/GND. |
| 11–18 | Y1–Y8 | Buffer output channels - high-drive, 3-state outputs with ±6 mA capability at 5 V. |
| 10 | GND | Ground reference - must be connected to system common return path for stable operation. |
| 20 | VCC | Positive supply - accepts 2–6 V; requires local 0.1 µF bypass capacitor adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2–6 V operation - eliminates need for separate voltage rails when interfacing mixed-voltage subsystems (e.g., 3.3 V MCU to 5 V peripheral bus). |
| Data-Flow-Through Pinout | Inputs on left, outputs on right (SOIC top view) - reduces layer count and via usage in dense PCB layouts for parallel data paths. |
| Low-Power CMOS Design | 80 µA max ICC - enables use in always-on monitoring circuits without compromising system-level power budget. |
| High-Current 3-State Outputs | ±6 mA drive at 5 V - supports direct connection to legacy TTL loads or LED indicators without external drivers. |
| ESD Robustness | ±2000 V HBM - meets industrial handling requirements and reduces susceptibility to assembly-line ESD events. |
Applications
| PC Motherboard I/O Buffering | Industrial PLC Backplane Interface |
|---|---|
|
Use Scenario: Isolating and driving parallel address/data lines between southbridge and legacy peripherals (e.g., Super I/O, LPC bus devices). IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing bidirectional bus contention control and fanout expansion. Use Value: Enables clean signal integrity on shared buses by preventing back-driving during idle cycles, leveraging dual OE pins for precise timing-aligned enable/disable sequencing. |
Use Scenario: Interfacing microcontroller GPIO banks to modular I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer for 24 V digital input conditioning and relay driver staging. Use Value: Delivers ±6 mA per channel to drive optocoupler inputs or small-signal relays while maintaining compatibility with 3.3 V controller logic levels. |
| LED Status Indication Array | Wearable Health Sensor Hub |
|
Use Scenario: Driving multi-segment LED displays or status indicators in medical diagnostic equipment front panels. IC Role / Device Role / Timing Role: High-current sink/source driver for common-anode or common-cathode LED configurations. Use Value: Eliminates need for discrete transistor arrays by delivering 6 mA per segment directly from 5 V rail, reducing BOM count and board area. |
Use Scenario: Signal conditioning and multiplexing between low-power sensor nodes (ECG, SpO₂) and host MCU in compact wearable form factors. IC Role / Device Role / Timing Role: Low-quiescent-current buffer isolating analog front-end signals from noisy digital domains. Use Value: 80 µA max ICC preserves battery life in always-on monitoring mode, while 2 V minimum VCC allows operation directly from single-cell Li-ion (2.7–4.2 V) without regulation. |
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 |
|---|---|---|---|
| SN74HCT541DW | CMOS-TTL compatible input thresholds (VIH = 2 V min @ VCC = 4.5 V); identical pinout and output drive. | Better suited for mixed 5 V TTL/CMOS systems where input noise margins must match legacy TTL logic families. | Select SN74HCT541DW when interfacing with older 5 V TTL outputs; otherwise SN74HC541DW offers wider VCC flexibility. |
| 74LCX541MTCX | Lower VCC range (2.0–3.6 V), higher speed (tpd = 5.5 ns @ 3.3 V), smaller TSSOP-20 package (4.4 × 6.5 mm). | Optimized for 3.3 V-only portable/embedded designs requiring minimal footprint and faster propagation. | Choose 74LCX541MTCX for space-constrained 3.3 V applications; SN74HC541DW remains preferred for 2–6 V adaptability and SOIC-20 manufacturability. |
Compared with SN74HCT541DW and 74LCX541MTCX, SN74HC541DW uniquely balances broad supply voltage support (2–6 V), industrial temperature rating, and SOIC-20 package maturity - making it the most versatile choice for general-purpose bus buffering where voltage flexibility and production reliability are prioritized over extreme speed or ultra-low voltage operation.
Availability
SN74HC541DW is available at Aetrix Electronics and suitable for PC motherboard I/O buffering, industrial PLC backplane interface, and LED status indication arrays requiring stable component supply across extended product lifecycles.
Supply support for SN74HC541DW 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 expertise in high-reliability logic families.
The SN74HC541DW belongs to TI's 74HC high-speed CMOS logic series, designed specifically for robust, low-power bus interfacing in industrial, computing, and communications equipment where wide voltage tolerance and proven manufacturability are essential.
FAQ
What is the function of OE1 and OE2 on the SN74HC541DW?
The SN74HC541DW uses two active-low output-enable inputs (OE1 and OE2) connected to a NOR gate controlling all eight outputs. Both OE1 and OE2 must be low to enable Y1–Y8; if either is high, all outputs enter high-impedance state. This dual-enable structure allows flexible bus arbitration - for example, OE1 can serve as system-wide enable while OE2 acts as channel-group select - and improves fault tolerance versus single-OE designs. The SN74HC541DW datasheet confirms this behavior in Table 8-1 and Section 8.4.
Can SN74HC541DW operate at 3.3 V supply voltage?
Yes, SN74HC541DW is fully specified for operation at 3.3 V: recommended operating conditions (Section 6.3) list VCC = 3.3 V within the 2–6 V range, and electrical characteristics (Section 6.7) confirm VOH ≥ 3.15 V and VOL ≤ 0.1 V at VCC = 4.5 V - extrapolating reliably to 3.3 V. At 3.3 V, typical tpd is ~15 ns (CL = 50 pF), output drive is ~±4 mA, and ICC remains ≤80 µA. This makes SN74HC541DW suitable for mixed-voltage systems interfacing 3.3 V MCUs with 5 V peripherals.
What is the maximum capacitive load SN74HC541DW can drive reliably?
SN74HC541DW is characterized for CL = 50 pF and CL = 150 pF loads in its switching specifications (Sections 6.8–6.13). At VCC = 6 V, tpd increases from 10 ns (50 pF) to 14 ns (150 pF), and tt (output transition time) rises from 6 ns to 13 ns - confirming stable operation up to 150 pF. Driving >150 pF risks violating setup/hold timing in high-speed buses; for heavier loads, add series termination or use a dedicated line driver. The SN74HC541DW's 35 pF typical Cpd (Section 6.14) also indicates internal node capacitance consistent with this rating.
How does SN74HC541DW differ from SN74LS541 in practical design?
SN74HC541DW (CMOS) consumes 80 µA ICC versus ~28 mA for SN74LS541 (bipolar TTL), enabling orders-of-magnitude lower static power. It operates from 2–6 V versus LS541's fixed 5 V, supports higher noise margins (VIH = 3.15 V min at 4.5 V vs. 2 V for LS), and offers symmetrical ±6 mA output drive versus LS541's asymmetric 8 mA sink / 0.4 mA source. However, SN74HC541DW has slower edge rates than LS541 - beneficial for EMI reduction but requiring attention to trace impedance in >10 MHz applications. The SN74HC541DW replaces LS541 in modern low-power, mixed-voltage designs.
Is SN74HC541DW RoHS compliant and lead-free?
Yes, SN74HC541DW is RoHS compliant and lead-free. Per TI's Package Option Addendum (page 15), orderable part SN74HC541DWR.A carries "Yes" in the RoHS column and "NIPDAU" (Nickel/Palladium/Gold) lead finish - confirming Pb-free terminations and compliance with EU RoHS Directive 2011/65/EU. The SOIC-20 (DW) package is rated for peak reflow of 260°C (MSL Level-1), suitable for standard lead-free soldering processes. TI's official product folder and packaging documentation verify this status for all active DW variants.
SN74HC541DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HC541DW FAQ
1.How can I place an order for SN74HC541DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC541DW 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 SN74HC541DW reliable?
The price and inventory of SN74HC541DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC541DW is usually 5 days.
3.What payment methods are accepted for SN74HC541DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC541DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC541DW?
SN74HC541DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC541DW 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 SN74HC541DW?
For technical support, including SN74HC541DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC541DW requirements.
6.How does Aetrix verify that SN74HC541DW is sourced from the original manufacturer or authorized distributors?
All SN74HC541DW 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 SN74HC541DW meets industry standards.
7.What is the process for return or replacement of SN74HC541DW?
All SN74HC541DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC541DW, 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 SN74HC541DW part is unused and in its original packaging.
Return procedure for SN74HC541DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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