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Texas Instruments SN74HCT541DWRE4
- Part No.:
- SN74HCT541DWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HCT541DWRE4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,472
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Product details
Overview
SN74HCT541DWRE4 from Texas Instruments is an octal buffer and line driver IC with 3-state outputs, designed for bus interface and load-driving applications in 5-V TTL-compatible digital systems. It operates from 4.5 V to 5.5 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 12 ns, and supports up to 15 LSTTL loads.
For engineers reviewing the SN74HCT541DWRE4 datasheet, SN74HCT541DWRE4 pinout, SN74HCT541DWRE4 application, or SN74HCT541DWRE4 equivalent, this page provides verified functional modes, thermal metrics, switching characteristics under 50 pF and 150 pF loads, and confirmed SOIC-20 package implementation details for PCB layout and signal integrity planning.
Technical Context
The SN74HCT541DWRE4 implements eight independent non-inverting buffers, each with true (non-inverted) data path and dual 3-state enable inputs (OE1, OE2) wired as a 2-input NOR gate - asserting either OE high places all outputs in high-impedance state. Its TTL-compatible inputs accept 0.8 V (VIL) and 2.0 V (VIH) thresholds across 4.5–5.5 V supply.
Designed as a performance- and pinout-optimized variant of the 'HC240 family, it features split-side pinout (all inputs on one side, all outputs on the opposite side), reducing trace crossovers in dense bus routing. It meets HCT logic family specifications including 80 µA max ICC and 1 µA max input current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and mixed-voltage system rails. |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads without external buffering. |
| Propagation Delay | 12 ns typical (5.5 V, CL = 50 pF) - enables reliable operation in 30-MHz+ bus timing budgets. |
| Input Compatibility | TTL-voltage compatible (VIL = 0.8 V, VIH = 2.0 V) - interfaces seamlessly with legacy 5-V TTL logic without level shifters. |
| Quiescent Current | 80 µA max ICC - supports low-static-power system design in always-on control modules. |
| 3-State Enable Logic | NOR-gated OE1/OE2 - single-pin disable capability simplifies bus arbitration control logic. |
| Thermal Resistance | RθJA = 109.1 °C/W (SOIC-20) - informs heatsinking requirements for sustained 8-output switching at ambient ≤85°C. |
Pinout & Package
SN74HCT541DWRE4 is housed in a 20-pin SOIC (DW) package with nominal body size 12.80 mm × 7.50 mm and maximum height 2.65 mm. The package uses NIPDAU lead finish, is RoHS-compliant, and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Input A1–A8 | True logic inputs accepting TTL-level signals; tied to GND or VCC if unused per TI SCBA004 guidance. |
| 9, 19 | Output Enable OE1, OE2 | NOR-gated 3-state control: either high disables all Y outputs into high-Z state. |
| 10, 11, 13, 14, 15, 16, 17, 18 | Output Y1–Y8 | Non-inverting buffered outputs; each capable of ±6 mA sink/source at 5 V. |
| 12 | GND | Ground reference for logic and power; requires local 0.1-µF bypass capacitor per TI layout guidelines. |
| 20 | VCC | Positive supply rail (4.5–5.5 V); must be decoupled adjacent to pin with 0.1-µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Data Flow-Through Pinout | Inputs (A1–A8) on left side, outputs (Y1–Y8) on right side - eliminates layer transitions and reduces crosstalk in parallel bus layouts. |
| High-Current 3-State Outputs | ±6 mA drive strength per output at 5 V - eliminates need for external bus transceivers in medium-load applications. |
| Low Input Current | ≤1 µA max - minimizes loading on upstream drivers and preserves fanout margin in cascaded logic stages. |
| Controlled Switching Times | tpd = 12 ns typ, ten/tdis = 19 ns typ (5.5 V, 50 pF) - enables deterministic timing closure in synchronous bus designs. |
| Bus-Friendly Enable Architecture | Dual OE inputs with NOR logic - allows flexible enable routing (e.g., one OE shared across multiple devices, second used for local gating). |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module I/O Expansion |
|---|---|
Use Scenario: Isolating and driving 8-bit parallel sensor data from ADCs or microcontroller GPIO to a shared backplane bus. IC Role / Device Role / Timing Role: Octal buffer providing bidirectional bus isolation and level translation between MCU and legacy 5-V peripheral cards. Use Value: Eliminates contention during hot-swap events via fast 19-ns 3-state enable/disable, supporting robust fault-tolerant backplane architecture. | Use Scenario: Expanding microcontroller GPIO to control multiple relays, LEDs, and solenoids in vehicle door modules. IC Role / Device Role / Timing Role: Non-inverting line driver translating low-current MCU outputs to high-current 6-mA capable signals for discrete actuator control. Use Value: Direct drive of 15 LSTTL-equivalent loads avoids discrete transistor arrays, reducing BOM count and board area. |
| Test Equipment Digital Pattern Generator | Legacy Computer System Memory Address Buffering |
Use Scenario: Generating precise, synchronized 8-bit stimulus waveforms for DUT digital input testing. IC Role / Device Role / Timing Role: Timing-critical buffer ensuring sub-20-ns edge alignment across all 8 channels under 50-pF probe loading. Use Value: 12-ns typical tpd and matched propagation paths minimize skew (<1 ns variation), critical for setup/hold compliance in high-speed test fixtures. | Use Scenario: Buffering 8-bit memory address lines between CPU and SRAM/ROM in retro-computing or industrial controller designs. IC Role / Device Role / Timing Role: True (non-inverting) address line repeater maintaining signal integrity over long traces on multi-layer PCBs. Use Value: TTL-compatible inputs accept original CPU address signals without level conversion; SOIC-20 footprint fits legacy board layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer and line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT240DW | Inverting outputs; dual 4-bit groups with separate OE controls; identical SOIC-20 package and electrical specs. | Suitable where signal inversion is required per channel group (e.g., differential bus drivers), not direct replacement for non-inverting use cases. | Select SN74HCT240DW only when inverting logic is part of system architecture; verify OE pin assignment matches control plane. |
| SN74LVC541APW | 3.3-V operation (1.65–3.6 V); lower drive (±24 mA), faster tpd (5.2 ns typ), TSSOP-20 package (6.5 × 4.4 mm). | Targeted for modern low-voltage embedded systems; incompatible with 5-V buses without level shifting. | Choose SN74LVC541APW for new 3.3-V designs requiring higher speed and smaller footprint; not interoperable with 5-V SN74HCT541DWRE4 systems. |
Compared with SN74HCT240DW and SN74LVC541APW, the SN74HCT541DWRE4 uniquely delivers true (non-inverting) 5-V TTL-compatible buffering in SOIC-20 with optimized pinout for bus layout - making it the only drop-in solution for legacy 5-V address/data bus expansion where signal polarity and voltage domain are fixed.
Availability
SN74HCT541DWRE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, test equipment pattern generation, and legacy computer memory subsystems requiring stable component supply and long-term obsolescence management.
Supply support for SN74HCT541DWRE4 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 heritage in industry-standard logic families.
The SN74HCT541DWRE4 belongs to TI's HCT logic product line, engineered for seamless 5-V TTL system integration with emphasis on bus interface reliability, layout efficiency, and industrial temperature operation (–40°C to +85°C).
FAQ
What is the recommended operating voltage range for SN74HCT541DWRE4?
The SN74HCT541DWRE4 is specified to operate from 4.5 V to 5.5 V. Operation outside this range may result in undefined logic states or increased ICC. TI recommends maintaining VCC within these limits across the full operating temperature range (–40°C to +85°C) and using a 0.1-µF ceramic bypass capacitor directly at the VCC pin to suppress supply noise.
How does the 3-state enable logic work on SN74HCT541DWRE4?
The SN74HCT541DWRE4 uses a 2-input NOR gate for 3-state control: if either OE1 (pin 9) or OE2 (pin 19) is driven high, all eight Y outputs enter high-impedance state. Both OE inputs must be low for normal buffered output operation. This architecture allows flexible bus arbitration - for example, OE1 can serve as global enable while OE2 provides local device gating.
Can SN74HCT541DWRE4 drive standard TTL loads directly?
Yes, the SN74HCT541DWRE4 can drive up to 15 LSTTL loads directly. Its ±6-mA output drive capability at 5 V meets the LSTTL input current requirements (IIL = –0.4 mA, IIH = 0.02 mA), eliminating the need for additional buffer stages in most 5-V bus applications. Ensure proper termination and ground return paths to maintain signal integrity at full load.
What is the thermal resistance (RθJA) of SN74HCT541DWRE4 in its SOIC-20 package?
The junction-to-ambient thermal resistance (RθJA) for SN74HCT541DWRE4 in the SOIC-20 (DW) package is 109.1 °C/W, per TI's May 2022 revision of SCLS306E. This value assumes standard JEDEC 2S2P test board conditions; actual board-level RθJA will vary based on copper area, layer count, and airflow. For continuous 8-output switching, derate power dissipation accordingly.
Is SN74HCT541DWRE4 pin-compatible with other members of the 'HCT541 family?
Yes, SN74HCT541DWRE4 shares identical pinout and functionality with all other 'HCT541 variants (e.g., SN74HCT541DBR, SN74HCT541N), differing only in package type and marking. The SOIC-20 (DW) footprint is mechanically and electrically interchangeable with other DW-suffix parts, including obsolete SN74HCT541DW and active SN74HCT541DWR - all use the same 12.80 mm × 7.50 mm body and pin 1 orientation.
SN74HCT541DWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HCT541DWRE4 FAQ
1.How can I place an order for SN74HCT541DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT541DWRE4 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 SN74HCT541DWRE4 reliable?
The price and inventory of SN74HCT541DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT541DWRE4 is usually 5 days.
3.What payment methods are accepted for SN74HCT541DWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT541DWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT541DWRE4?
SN74HCT541DWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT541DWRE4 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 SN74HCT541DWRE4?
For technical support, including SN74HCT541DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT541DWRE4 requirements.
6.How does Aetrix verify that SN74HCT541DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT541DWRE4 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 SN74HCT541DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74HCT541DWRE4?
All SN74HCT541DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT541DWRE4, 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 SN74HCT541DWRE4 part is unused and in its original packaging.
Return procedure for SN74HCT541DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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