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Texas Instruments SN74HCT541DBR
- Part No.:
- SN74HCT541DBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74HCT541DBR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,522
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Product details
Overview
SN74HCT541DBR from Texas Instruments is an octal non-inverting buffer/line driver 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 - commonly used in industrial control backplanes and data acquisition I/O expansion.
For engineers reviewing the SN74HCT541DBR datasheet, SN74HCT541DBR pinout, SN74HCT541DBR application, or SN74HCT541DBR equivalent, key selection criteria include its true-output logic configuration, dual 3-state enable (OE1/OE2) architecture, SSOP-20 package footprint, and compatibility with legacy 'HC240-series board layouts requiring input/output separation across package edges.
Technical Context
The SN74HCT541DBR implements eight independent non-inverting buffers, each with high-current 3-state outputs controlled by a dual-input NOR gate (OE1 and OE2). When either enable input is high, all outputs enter high-impedance state - enabling bidirectional bus sharing without external direction control logic.
Its TTL-compatible inputs accept 0.8 V (VIL) and 2.0 V (VIH) thresholds under 4.5–5.5 V supply, while output voltage levels meet LSTTL specifications: VOH ≥ 3.7 V and VOL ≤ 0.33 V at 6 mA sink/source. The device uses HCT logic family silicon, ensuring CMOS power efficiency with bipolar-compatible switching performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation across standard 5-V rail tolerances and brown-out immunity. |
| Propagation Delay (tpd) | 12 ns typ @ 5.5 V, CL = 50 pF - enables reliable timing in 33-MHz bus systems with margin. |
| Output Drive | ±6 mA @ 5 V - sufficient to directly drive 15 LSTTL loads without external buffering. |
| Input Compatibility | TTL-voltage compatible (VIL = 0.8 V, VIH = 2.0 V) - interoperable with legacy 74LS and 74ALS logic families. |
| Quiescent Current | 80 µA max ICC - supports low-static-power system design in always-on industrial modules. |
| 3-State Enable Logic | NOR-gated OE1/OE2 - active-low enable behavior allows wired-OR bus arbitration or synchronous output disable. |
Pinout & Package
SN74HCT541DBR is housed in a 20-pin Small-Outline Shrink Plastic Package (SSOP-20), body size 7.20 mm × 5.30 mm, 0.65 mm lead pitch, with 2.0 mm max height and moisture sensitivity level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Input A1–A8 | True logic inputs driving corresponding Y outputs; placed on left side for PCB layout separation from outputs. |
| 9, 19 | OE1, OE2 | Active-low 3-state enable inputs; NOR logic means either high disables all outputs simultaneously. |
| 10, 11, 12, 13, 14, 15, 16, 18 | Output Y1–Y8 | Non-inverting buffered outputs; placed on right side to support orthogonal trace routing on dense boards. |
| 17 | VCC | Positive supply terminal; requires local 0.1-µF bypass capacitor per TI layout guidelines. |
| 20 | GND | Ground reference; shared return path for all buffers and enable circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Data flow-through pinout | Inputs (A1–A8, OE1, OE2) on left edge; outputs (Y1–Y8) on right edge - reduces layer count and crosstalk in high-density bus routing. |
| High-current 3-state outputs | ±6 mA drive capability per output at 5 V - eliminates need for discrete pull-up/pull-down resistors in shared-bus configurations. |
| Low input current | ≤1 µA max - prevents loading of upstream logic stages and preserves fan-out integrity in cascaded designs. |
| Thermal performance | RθJA = 122.7 °C/W (SSOP) - validated for continuous operation at 85 °C ambient in enclosed industrial enclosures. |
Applications
| Industrial PLC Backplane Interface | Test Equipment Digital I/O Module |
|---|---|
Use Scenario: Isolating and buffering address/data lines between microcontroller and modular I/O cards in programmable logic controllers. IC Role / Device Role / Timing Role: Octal buffer providing level translation, noise immunity, and bus contention protection between CPU and field-side peripherals. Use Value: Enables direct connection to 15 LSTTL loads per channel while maintaining <12 ns propagation delay for deterministic scan-cycle timing. | Use Scenario: Driving multiple DUT (device-under-test) signal lines from a test pattern generator in automated test equipment. IC Role / Device Role / Timing Role: Line driver with 3-state control allowing dynamic reconfiguration of stimulus/sense paths during test sequences. Use Value: Dual OE inputs permit synchronized enable/disable of all eight channels, supporting precise timing windows for parallel vector testing. |
| Legacy System Bus Extender | Embedded Data Acquisition Front-End |
Use Scenario: Extending TTL-compatible control bus signals across long PCB traces or daughterboard connectors in avionics subsystems. IC Role / Device Role / Timing Role: Signal repeater compensating for capacitive loading and voltage drop on extended traces. Use Value: 4.5–5.5 V operating range and 0.8 V/2.0 V input thresholds ensure compatibility with aging 74LS-based infrastructure. | Use Scenario: Conditioning sensor interface signals before ADC sampling in environmental monitoring nodes. IC Role / Device Role / Timing Role: Input buffer isolating sensitive analog front-end from noisy digital control logic. Use Value: Low 80 µA quiescent current minimizes system-level standby power, critical for battery-operated remote sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT240DBR | Inverting outputs; identical pinout, supply, and timing specs. | Requires logic inversion in signal path; unsuitable where true output polarity is mandatory. | Select SN74HCT240DBR only when system-level inversion is acceptable or required. |
| SN74LV541APWR | Lower 2.0–5.5 V supply range; 3.3-V optimized; 16 mA drive; LV logic family. | Better suited for mixed-voltage 3.3-V/5-V systems but not pin-compatible with HCT-level thresholds. | Choose SN74LV541APWR for new 3.3-V designs needing higher drive; avoid for strict 5-V TTL replacement. |
Compared with SN74HCT240DBR and SN74LV541APWR, the SN74HCT541DBR uniquely provides true-output polarity within the HCT family at 5 V, making it the only drop-in option for legacy non-inverting bus interfaces requiring guaranteed signal phase alignment and TTL-level compatibility.
Availability
SN74HCT541DBR is available at Aetrix Electronics and suitable for industrial PLC backplanes, test equipment I/O modules, and embedded data acquisition systems requiring stable component supply and long-term production continuity.
Supply support for SN74HCT541DBR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74HCT541DBR belongs to TI's industry-standard 74HCT logic family, engineered specifically for 5-V TTL-compatible digital interfacing with low power consumption and high noise immunity in harsh environments.
FAQ
What is the maximum operating temperature for SN74HCT541DBR?
The SN74HCT541DBR is rated for operation from –40 °C to +85 °C ambient temperature. This industrial-grade temperature range is validated per TI's recommended operating conditions and thermal metrics (RθJA = 122.7 °C/W), making it suitable for deployment in enclosed control cabinets and uncooled instrumentation enclosures where ambient temperatures may approach 85 °C.
Does SN74HCT541DBR support 3.3-V input logic levels?
No, SN74HCT541DBR does not reliably recognize 3.3-V logic levels as valid inputs. Its input thresholds are fixed at VIL = 0.8 V and VIH = 2.0 V under 4.5–5.5 V supply - optimized for 5-V TTL compatibility. Applying 3.3-V signals risks indeterminate switching or increased static current; use SN74LV541APWR or level translators for mixed-voltage interfacing.
How many LSTTL loads can SN74HCT541DBR drive per output?
Each output of the SN74HCT541DBR can drive up to 15 LSTTL loads, based on its ±6 mA output drive capability at 5 V and LSTTL input current requirements (IIL ≤ 0.4 mA, IIH ≤ 20 µA). This specification is explicitly stated in TI's datasheet Feature section and verified under recommended operating conditions with CL = 50 pF.
Is SN74HCT541DBR pin-compatible with SN74HCT240DBR?
Yes, SN74HCT541DBR and SN74HCT240DBR share identical SSOP-20 pinouts and package dimensions, including matching pin functions (A1–A8, Y1–Y8, OE1, OE2, VCC, GND). The sole functional difference is output polarity: SN74HCT541DBR provides true (non-inverting) outputs, while SN74HCT240DBR provides inverted outputs - requiring signal inversion in downstream logic if substituted.
What is the purpose of the dual OE inputs (OE1 and OE2) on SN74HCT541DBR?
The dual OE inputs (OE1 and OE2) on SN74HCT541DBR implement a NOR-gated 3-state control: if either OE1 or OE2 is driven high, all eight outputs enter high-impedance state. This architecture enables flexible bus arbitration - for example, OE1 can be used for global disable while OE2 serves as channel-select enable in multiplexed I/O systems - without requiring external logic gates.
SN74HCT541DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-SSOP
SN74HCT541DBR FAQ
1.How can I place an order for SN74HCT541DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT541DBR 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 SN74HCT541DBR reliable?
The price and inventory of SN74HCT541DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT541DBR is usually 5 days.
3.What payment methods are accepted for SN74HCT541DBR?
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4.How is shipping managed for SN74HCT541DBR?
SN74HCT541DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT541DBR 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 SN74HCT541DBR?
For technical support, including SN74HCT541DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT541DBR requirements.
6.How does Aetrix verify that SN74HCT541DBR is sourced from the original manufacturer or authorized distributors?
All SN74HCT541DBR 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 SN74HCT541DBR meets industry standards.
7.What is the process for return or replacement of SN74HCT541DBR?
All SN74HCT541DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT541DBR, 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 SN74HCT541DBR part is unused and in its original packaging.
Return procedure for SN74HCT541DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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