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Texas Instruments CD74HC541EG4
- Part No.:
- CD74HC541EG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HC541EG4.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,164
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Product details
Overview
CD74HC541EG4 from Texas Instruments is a non-inverting octal buffer and line driver with three-state outputs, designed for bus interface and data routing in digital systems. It operates from 2 V to 6 V, delivers 15 LSTTL load drive capability, exhibits 9 ns typical propagation delay at 5 V/15 pF, and supports –55℃ to 125℃ industrial/military temperature range - used in backplane I/O buffering and microcontroller peripheral expansion.
For engineers reviewing the CD74HC541EG4 datasheet, CD74HC541EG4 pinout, CD74HC541EG4 application, or CD74HC541EG4 equivalent, key selection considerations include its non-inverting logic polarity, dual output-enable control (OE1/OE2), three-state bus-driving capability, wide supply voltage tolerance, and compatibility with both CMOS and TTL-level input signals.
Technical Context
This device implements eight independent non-inverting buffer channels, each with high-impedance (Z) output control via two active-low enable inputs (OE1, OE2). Outputs enter high-Z state if either OE1 or OE2 is HIGH; data passes only when both enables are LOW. The architecture supports bidirectional bus isolation and avoids contention in shared-data-path systems.
It belongs to the 74HC family, featuring CMOS technology with rail-to-rail output swing, low static current (≤160 μA over full temperature range), and high noise immunity (NIL/NIH = 30% of VCC at 5 V). Its switching characteristics are specified across –55℃ to 125℃, with propagation delays tightly characterized for CL = 15 pF and CL = 50 pF loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Non-inverting octal buffer with three-state outputs - enables controlled data flow onto shared buses without signal contention. |
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system interfacing and battery-powered operation down to 2 V. |
| Propagation Delay (tPLH/tPHL) | 9 ns typical at VCC = 5 V, CL = 15 pF - ensures timing-critical bus handshaking in high-speed digital logic designs. |
| Output Drive Strength | 15 LSTTL loads - sufficient to drive standard TTL fanout without external buffers in legacy or hybrid logic systems. |
| Operating Temperature | –55℃ to 125℃ - qualified for aerospace, automotive under-hood, and industrial control applications requiring extended thermal reliability. |
| Input Leakage Current | ±1 μA max at 6 V - minimizes power loss and prevents unintended logic transitions in high-impedance or battery-sensitive circuits. |
| Three-State Leakage (IOZ) | ±10 μA max at 6 V - ensures robust high-impedance isolation during bus arbitration or standby modes. |
Pinout & Package
CD74HC541EG4 is supplied in a 20-pin plastic dual in-line package (PDIP-N), with body dimensions 25.40 mm × 6.35 mm and 2.54 mm lead pitch. Pin 1 is located at the left end of the top row, identified by a notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Inputs (A0–A7) | Non-inverting data inputs - accept CMOS- or TTL-compatible logic levels; must be tied HIGH/LOW if unused to prevent floating. |
| 9, 19 | Output Enables (OE1, OE2) | Active-low enables - outputs go high-Z if either is HIGH; both must be LOW for data pass-through. |
| 11, 12, 13, 14, 15, 16, 17, 18 | Outputs (Y0–Y7) | Three-state buffered outputs - drive up to 15 LSTTL loads; high-Z state eliminates bus conflicts during multiplexing. |
| 10 | GND | Ground reference - requires local 0.1-μF bypass capacitor adjacent to pin for stable switching performance. |
| 20 | VCC | Positive supply - accepts 2–6 V; decoupling capacitor placement directly at this pin is critical for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Non-inverting logic polarity | Preserves signal phase integrity across all eight channels - essential for address/data bus mirroring and synchronous control paths. |
| Dual active-low output enables | Provides redundant or split enable control (e.g., one for system-level, one for channel-group gating), enhancing fault-tolerant bus management. |
| 15-LSTTL load drive capability | Eliminates need for additional bus drivers in legacy TTL-CMOS hybrid systems, reducing component count and board space. |
| Wide 2–6 V supply range | Enables direct interfacing between 3.3 V microcontrollers and 5 V peripherals without level-shifting circuitry. |
| High noise immunity (30% VCC) | Reduces susceptibility to EMI-induced glitches in electrically noisy environments such as motor drives or industrial PLCs. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module I/O Expansion |
|---|---|
|
Use Scenario: Buffering parallel I/O signals between a main controller and distributed I/O modules on a ruggedized backplane. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing isolated, three-state-controlled data path between CPU and field I/O cards. Use Value: Enables hot-swap-safe bus arbitration and prevents signal contention during module insertion/removal using dual OE control. |
Use Scenario: Expanding GPIO count of an automotive MCU to manage door locks, window motors, and lighting relays. IC Role / Device Role / Timing Role: Level-translating and fanout-multiplying buffer driving multiple 5 V relay coils and optocouplers from 3.3 V MCU outputs. Use Value: Delivers 15-LSTTL drive strength at 5 V while operating reliably from 2 V to 6 V - accommodates vehicle battery voltage fluctuations. |
| Military Data Acquisition System Bus Isolation | Test Equipment Digital Pattern Generator Output Stage |
|
Use Scenario: Isolating ADC/DAC data buses in a radiation-hardened data acquisition unit operating across –55℃ to 125℃. IC Role / Device Role / Timing Role: Three-state octal buffer enabling time-multiplexed access to shared memory or sensor interfaces without bus contention. Use Value: Guaranteed operation over full military temperature range with ≤9 ns propagation delay ensures deterministic timing in real-time sampling systems. |
Use Scenario: Driving high-fanout test vectors from a pattern generator ASIC into multiple DUT input channels simultaneously. IC Role / Device Role / Timing Role: Non-inverting buffer stage delivering clean, low-skew, three-state-controllable logic edges to DUT pins. Use Value: Balanced tPLH/tPHL and tTHL/tTLH transition times minimize timing skew across all eight outputs - critical for synchronized stimulus delivery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC244N | Same 20-pin PDIP package; identical 2–6 V supply and 15-LSTTL drive, but uses single active-low OE (not dual OE1/OE2). | Lacks independent enable control per half-bank - less flexible for segmented bus gating or fault-isolation schemes. | Select SN74HC244N when simplified enable logic suffices and dual-OE functionality is unnecessary. |
| CD74HCT541E | Pin-compatible HCT variant; 4.5–5.5 V only, TTL-input compatible (VIH = 2 V min, VIL = 0.8 V max), higher ICC at temperature extremes. | Required where strict 5 V TTL input thresholds are mandated - e.g., legacy 74LS system upgrades with no voltage translation. | Select CD74HCT541E only when interfacing directly with older 74LS devices; otherwise CD74HC541EG4 offers wider voltage flexibility. |
Compared with SN74HC244N, CD74HC541EG4 provides finer-grained bus control via dual OE inputs; compared with CD74HCT541E, it supports broader supply voltage operation and lower static power, making it preferable for mixed-voltage or low-power embedded designs.
Availability
CD74HC541EG4 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and military-grade data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HC541EG4 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 high-reliability logic families.
CD74HC541EG4 belongs to TI's 74HC high-speed CMOS logic portfolio, engineered for robust performance in harsh environments - targeting applications demanding wide voltage operation, low power, and guaranteed military-temperature functionality.
FAQ
What is the logic function and polarity of CD74HC541EG4?
CD74HC541EG4 is a non-inverting octal buffer with three-state outputs. Each of its eight channels passes input A0–A7 to corresponding outputs Y0–Y7 without inversion. Its dual active-low output enables (OE1, OE2) allow high-impedance control - outputs enter Z-state if either enable is HIGH, and drive only when both are LOW. This behavior is confirmed in the truth table and functional description of the official TI datasheet.
What supply voltage range does CD74HC541EG4 support, and how does it affect compatibility?
CD74HC541EG4 operates from 2 V to 6 V, making it compatible with 3.3 V and 5 V systems without level shifters. At 2 V, it maintains valid logic thresholds (VIH = 1.5 V, VIL = 0.5 V); at 6 V, VOH/VOL remain rail-aligned. This wide range supports battery-powered devices, mixed-voltage boards, and brown-out resilience - unlike the 4.5–5.5 V-limited CD74HCT541E variant.
How does the dual output-enable architecture of CD74HC541EG4 improve system design?
The dual OE inputs (OE1, OE2) in CD74HC541EG4 enable hierarchical or redundant bus control - for example, OE1 can serve as a global enable while OE2 acts as a local subsystem gate. This allows partial bus isolation without disabling all channels, improving fault containment and supporting hot-swap protocols. The truth table explicitly defines that either OE HIGH forces all outputs to high-Z, a feature not present in single-OE alternatives like SN74HC244N.
What is the maximum capacitive load CD74HC541EG4 can drive while maintaining specified timing?
CD74HC541EG4 is characterized for CL = 15 pF (typical 9 ns propagation delay) and CL = 50 pF (max 30 ns at 6 V). Its output structure supports up to 15 LSTTL loads - equivalent to ~450 pF total load capacitance assuming standard 30 pF per TTL input. Exceeding CL = 50 pF increases delay nonlinearly and may degrade edge rates; layout best practices (short traces, ground planes) are recommended for >30 pF loads.
Is CD74HC541EG4 suitable for use in automotive under-hood applications?
Yes - CD74HC541EG4 is rated for –55℃ to 125℃ operation and is offered in PDIP packaging with NIPDAU lead finish (RoHS-compliant). Its guaranteed parametric performance across this full range, combined with low ICC (≤160 μA) and high noise immunity (30% VCC), meets requirements for engine control, transmission, and body electronics. TI's catalog qualification and thermal metrics (RθJA = 84.6°C/W for PDIP) further validate its suitability.
CD74HC541EG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74HC541EG4 FAQ
1.How can I place an order for CD74HC541EG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC541EG4 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 CD74HC541EG4 reliable?
The price and inventory of CD74HC541EG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC541EG4 is usually 5 days.
3.What payment methods are accepted for CD74HC541EG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC541EG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC541EG4?
CD74HC541EG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC541EG4 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 CD74HC541EG4?
For technical support, including CD74HC541EG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC541EG4 requirements.
6.How does Aetrix verify that CD74HC541EG4 is sourced from the original manufacturer or authorized distributors?
All CD74HC541EG4 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 CD74HC541EG4 meets industry standards.
7.What is the process for return or replacement of CD74HC541EG4?
All CD74HC541EG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC541EG4, 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 CD74HC541EG4 part is unused and in its original packaging.
Return procedure for CD74HC541EG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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