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STMicroelectronics 74VHC541TTR
- Part No.:
- 74VHC541TTR
- Manufacturer:
- STMicroelectronics
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74VHC541TTR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,041
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Product details
Overview
74VHC541TTR from STMicroelectronics is an octal non-inverting bus buffer with 3-state outputs, designed for high-speed bidirectional data routing in 2V–5.5V logic systems. It delivers 3.5 ns typical propagation delay at 5V, ±8 mA symmetrical output drive, and supports 5V-to-3V level translation with input tolerance up to 7V independent of VCC. Used in memory address/data bus isolation and microcontroller peripheral interfacing.
For engineers reviewing the 74VHC541TTR datasheet, 74VHC541TTR pinout, 74VHC541TTR application, or 74VHC541TTR equivalent, key selection criteria include 3-state enable timing (tPZL/tPLZ), high-noise immunity (28% VCC), power-down input protection, and TSSOP-20 package compatibility with legacy 74-series layouts.
Technical Context
The device implements dual active-low output enable inputs (G1, G2) wired as a two-input AND gate: either high forces all eight Y outputs into high-impedance state. Its C2MOS process enables latch-up immunity and ESD robustness (2 kV HBM) without external clamping.
Input structure accepts 0–7 V regardless of VCC, enabling safe hot-swap and mixed-voltage operation. Output stage features matched rise/fall delays (tPLH ≈ tPHL) and low dynamic noise (VOLP ≤ 0.9 V), critical for clean signal integrity in dense PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 3.5 ns (typ) at VCC = 5V, CL = 15 pF - ensures sub-5 ns timing margin in 100 MHz bus cycles |
| Supply Voltage Range | 2.0 V to 5.5 V - supports single-supply operation across 3.3 V and 5 V logic domains |
| Output Drive | ±8 mA (min) at VCC = 3.0 V - sufficient to drive 15 pF loads with <10 ns edge rates |
| Input Voltage Range | 0 V to 7.0 V - allows safe interfacing with overvoltage-tolerant sensors or legacy 5 V peripherals |
| Quiescent Current | 4 µA (max) at TA = 25°C - enables ultra-low standby power in battery-backed systems |
| ESD Immunity | 2 kV HBM - eliminates need for external ESD protection diodes on I/O lines |
| Operating Temperature | −55°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
TSSOP-20 package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | G1, G2 | Active-low 3-state enable inputs - both must be low for output drive; OR logic enables flexible board-level control |
| 2–9 | A1–A8 | Non-inverting data inputs - tolerate 0–7 V, immune to supply sequencing issues |
| 11–18 | Y1–Y8 | Buffered non-inverting outputs - symmetrical IOH/IOL ensures matched rise/fall times |
| 10 | GND | Digital ground reference - separate from analog ground; decoupling required within 5 mm |
| 20 | VCC | Positive supply - operates from 2 V to 5.5 V; bypass capacitor (100 nF) mandatory at pin |
Key Features
| Feature | Design Value |
|---|---|
| Hot-swap input tolerance | Inputs accept 0–7 V regardless of VCC - prevents damage during live insertion or voltage rail mismatch |
| Matched propagation delays | tPLH ≈ tPHL - minimizes skew between rising/falling edges in synchronous bus applications |
| Low dynamic noise | VOLP ≤ 0.9 V (max) at CL = 50 pF - reduces crosstalk in high-density routing |
| Power-down input protection | Inputs remain high-impedance and fault-safe when VCC = 0 V - avoids back-driving powered subsystems |
| High noise immunity | VNIH/VNIL ≥ 28% VCC - rejects >1.4 V noise on 5 V buses and >0.84 V on 3 V buses |
Applications
| Memory Address Bus Isolation | Microcontroller Peripheral Interface |
|---|---|
Use Scenario: Isolating CPU address lines from multiple memory banks sharing a common bus. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer enabling time-multiplexed access without contention. Use Value: 3.5 ns propagation delay and matched tPLH/tPHL ensure setup/hold timing compliance across 100 MHz address strobes. | Use Scenario: Interfacing a 3.3 V microcontroller GPIO port to legacy 5 V LCD controller or keypad matrix. IC Role / Device Role / Timing Role: Level-translating bus buffer with overvoltage-tolerant inputs and rail-independent logic thresholds. Use Value: 0–7 V input range and 2.0–5.5 V VCC support eliminate external level shifters and reduce BOM count. |
| Industrial PLC I/O Expansion | Automotive Body Control Module |
Use Scenario: Expanding digital I/O capacity in programmable logic controllers using daisy-chained backplane buses. IC Role / Device Role / Timing Role: Octal buffer providing controlled bus drive strength and hot-swap-safe inputs for field-replaceable modules. Use Value: −55°C to +125°C rating and 2 kV ESD immunity meet EN 61000-4-2 requirements for factory-floor deployment. | Use Scenario: Isolating infotainment system CAN transceiver control signals from main MCU domain during sleep/wake transitions. IC Role / Device Role / Timing Role: Low-leakage (4 µA max ICC) 3-state gate enabling clean power domain separation. Use Value: Power-down protection prevents back-current flow when VCC is off, satisfying ISO 16750-2 load-dump immunity constraints. |
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 |
|---|---|---|---|
| SN74LVC541APWR | Lower VCC range (1.65–3.6 V); 3.3 V only; 5.5 ns tPD at 3.3 V | Not suitable for 5 V systems or mixed-voltage translation | Select when operating exclusively in 3.3 V domains with tighter space constraints (TSSOP-20 same footprint) |
| 74HC541PW | Slower speed (23 ns tPD at 4.5 V); higher ICC (80 µA typ); no 7 V input tolerance | Lacks hot-swap safety and fails under VCC brownout conditions | Acceptable only in cost-sensitive, non-critical 5 V-only applications with relaxed timing |
Compared with SN74LVC541APWR and 74HC541PW, the 74VHC541TTR uniquely combines 5 V compatibility, 7 V input tolerance, and sub-5 ns speed-making it the only choice for robust mixed-voltage bus isolation where reliability and timing coexist.
Availability
74VHC541TTR is available at Aetrix Electronics and suitable for memory bus isolation, microcontroller peripheral interfacing, and industrial PLC I/O expansion requiring stable component supply across automotive, industrial, and computing end markets.
Supply support for 74VHC541TTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for automotive, industrial, power, and embedded applications since 1987.
The 74VHC series targets high-speed, low-power CMOS logic replacement for legacy 74-series devices, emphasizing robustness, wide supply range, and interoperability in mixed-voltage system designs.
FAQ
Can 74VHC541TTR safely interface a 5 V sensor to a 3.3 V microcontroller?
Yes. Inputs tolerate 0–7 V regardless of VCC, and VCC can be set to 3.3 V while accepting 5 V logic inputs. The output will swing rail-to-rail (0 V to 3.3 V), meeting 3.3 V MCU input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). No external resistors or level shifters are needed.
What happens to outputs when VCC = 0 V but inputs are driven to 5 V?
All outputs remain in high-impedance state with no current flow. Input protection circuitry clamps input current to <±20 µA, preventing back-powering or latch-up. This power-down protection is guaranteed per Absolute Maximum Ratings and verified in application note AN2057.
Is the 74VHC541TTR pin-compatible with standard 74LS541 in TSSOP-20?
Yes. Pin numbering, function mapping (G1/G2, A1–A8, Y1–Y8, VCC, GND), and mechanical dimensions match JEDEC MO-153 for TSSOP-20. Signal routing and PCB footprints are identical-enabling drop-in replacement without layout changes.
Does the device require external pull-up or pull-down resistors on G1/G2?
No. Internal weak pull-downs (≈100 kΩ) hold G1/G2 low when unconnected, defaulting outputs to active state. External resistors are unnecessary unless active-high enable logic or noise immunity beyond 28% VCC is required-verified in DC Characteristics Table 6 (II ≤ ±1 µA).
74VHC541TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74VHC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74VHC541TTR FAQ
1.How can I place an order for 74VHC541TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHC541TTR 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 74VHC541TTR reliable?
The price and inventory of 74VHC541TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC541TTR is usually 5 days.
3.What payment methods are accepted for 74VHC541TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC541TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHC541TTR?
74VHC541TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHC541TTR 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 74VHC541TTR?
For technical support, including 74VHC541TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC541TTR requirements.
6.How does Aetrix verify that 74VHC541TTR is sourced from the original manufacturer or authorized distributors?
All 74VHC541TTR 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 74VHC541TTR meets industry standards.
7.What is the process for return or replacement of 74VHC541TTR?
All 74VHC541TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC541TTR, 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 74VHC541TTR part is unused and in its original packaging.
Return procedure for 74VHC541TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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