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onsemi 74LVT245MTCX
- Part No.:
- 74LVT245MTCX
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVT245MTCX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,451
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Product details
Overview
74LVT245MTCX from ON Semiconductor is a low-voltage octal bidirectional transceiver with 3-STATE inputs/outputs, designed for bus interface between 3.3V logic and 5V TTL systems. It features 20-pin TSSOP packaging, ±32mA/64mA output drive capability, 2.7–3.6V supply operation, and supports live insertion/extraction. It enables direction-controlled data flow between A and B ports in industrial control backplanes and embedded memory expansion interfaces.
For engineers reviewing the 74LVT245MTCX datasheet, pinout, applications, or equivalent options, key selection criteria include its 3.3V VCC compatibility with 5V-tolerant I/O, high-speed propagation delay (1.2–4.0 ns), power-up/down high-impedance behavior, and absence of bushold circuitry-distinguishing it from the LVTH245 variant.
Technical Context
The 74LVT245MTCX implements eight non-inverting bidirectional buffers controlled by two logic inputs: OE (active-HIGH output disable) and T/R (active-HIGH transmit, active-LOW receive). Its BiCMOS process delivers ABT-class speed at 3.3V while maintaining low static current (ICCZ = 0.19 mA) and robust 500mA latch-up immunity.
Unlike the bushold-equipped 74LVTH245MTCX, this device requires external pull-up resistors on unused inputs. Its 3-STATE outputs exhibit low leakage (±5 µA at 3.6V) and support hot-swap operation via glitch-free power-up/down high-Z states, making it suitable for dynamic bus arbitration in modular systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - Ensures stable operation in standard 3.3V rail systems with ±0.3V tolerance. |
| IOL / IOH | 64mA / –32mA - Supports driving heavy capacitive loads or multiple TTL inputs without level-shifting buffers. |
| tPLH / tPHL | 1.2–4.0 ns - Enables high-throughput data transfer in fast synchronous bus applications up to ~250 MHz. |
| VIH / VIL | 2.0V / 0.8V - Guarantees reliable logic recognition when interfacing with both 3.3V CMOS and legacy 5V TTL sources. |
| IOFF Leakage | ±100 µA - Maintains signal integrity during power-down or partial system sleep modes. |
| Operating Temp | –40°C to +85°C - Qualified for industrial temperature environments without derating. |
| CIN / COUT | 4 pF / 8 pF - Minimizes switching noise and reduces AC loading on driving sources and connected buses. |
Pinout & Package
74LVT245MTCX uses a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm wide, with 0.65mm lead pitch. The package supports fine-pitch PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-HIGH control: asserts HIGH-Z on both A and B ports when HIGH; enables bidirectional flow when LOW. |
| 2 (A0) | Port A Data Terminal | Bidirectional I/O: connects to local 3.3V bus; driven by or drives A-side logic depending on T/R state. |
| 3 (A1) | Port A Data Terminal | Same function as A0; all A0–A7 share identical electrical and timing characteristics. |
| 4 (A2) | Port A Data Terminal | Supports parallel 8-bit data path from A-side peripherals or controllers. |
| 5 (A3) | Port A Data Terminal | Enables full byte-wide communication without multiplexing or serialization. |
| 6 (A4) | Port A Data Terminal | Matches B4 timing and drive strength for symmetrical bus loading. |
| 7 (A5) | Port A Data Terminal | Validated for simultaneous switching with <1.0 ns skew across all A/B outputs. |
| 8 (A6) | Port A Data Terminal | Compatible with 5V-tolerant input thresholds (VIH = 2.0V min) for mixed-voltage interconnects. |
| 9 (A7) | Port A Data Terminal | Final bit of octal port; shares same DC and AC specs as A0–A6. |
| 10 (GND) | Ground Reference | Dedicated ground pin minimizes ground bounce during high-current switching events. |
| 11 (B7) | Port B Data Terminal | Bidirectional I/O: connects to remote 5V TTL bus; direction determined by T/R input. |
| 12 (B6) | Port B Data Terminal | Provides matched drive strength (64mA sink) to interface directly with standard TTL loads. |
| 13 (B5) | Port B Data Terminal | Supports hot-plug operation due to power-up/down high-Z behavior. |
| 14 (B4) | Port B Data Terminal | Same timing performance as A4: tPLH/tPHL ≤ 4.0 ns at 3.3V, CL = 50 pF. |
| 15 (B3) | Port B Data Terminal | Validated for ESD robustness: >2000V HBM, >200V MM, >1000V CDM. |
| 16 (B2) | Port B Data Terminal | Input clamp diode voltage (VIK = –1.2V) protects against negative transients on 5V bus lines. |
| 17 (B1) | Port B Data Terminal | DC input current limited to ±1 µA at control pins, reducing static power overhead. |
| 18 (B0) | Port B Data Terminal | First bit of B-port; electrically identical to B1–B7 per datasheet characterization. |
| 19 (T/R) | Transmit/Receive Control | Active-HIGH selects A→B data flow; active-LOW selects B→A; no internal pull-up/pull-down. |
| 20 (VCC) | Supply Voltage | 3.3V nominal input; accepts 2.7–3.6V range; decoupling required within 10 mm of pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| 3.3V VCC with 5V-tolerant I/O | Operates from 2.7–3.6V supply while accepting 0–5.5V input voltages-eliminates need for external level shifters in mixed-voltage systems. |
| Live insertion/extraction support | Power-up/down high-impedance state prevents bus contention during hot-swap events in modular backplane architectures. |
| High drive strength | 64mA sink / –32mA source capability allows direct connection to multiple TTL loads or long trace runs without buffering. |
| Latch-up immunity & ESD robustness | Exceeds 500mA latch-up current and 2000V HBM ESD-ensures reliability in industrial environments with noisy power rails. |
| Low static power consumption | ICCZ = 0.19 mA in 3-STATE mode reduces standby current in battery-backed or energy-sensitive subsystems. |
Applications
| Industrial Backplane Interface | Embedded Memory Expansion |
|---|---|
|
Use Scenario: Interfacing a 3.3V microcontroller unit to a legacy 5V ISA-style peripheral bus in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional voltage-level translator and bus driver enabling real-time register access and data streaming between mismatched voltage domains. Use Value: Eliminates discrete resistor networks or dedicated level-shifters, reducing BOM count and PCB area while maintaining sub-4ns propagation delay for deterministic timing. |
Use Scenario: Expanding external SRAM or Flash memory capacity on a 3.3V SoC-based edge node, where memory chips use 5V-compatible address/data buses. IC Role / Device Role / Timing Role: Octal bidirectional data transceiver managing shared AD[0:7] lines between processor and memory, synchronized to WR/RD strobes. Use Value: Provides full byte-width throughput with matched A/B timing (≤1.0 ns skew), ensuring setup/hold compliance for memory read/write cycles up to 25 MHz. |
| Modular I/O Carrier Board | Test Equipment Signal Routing |
|
Use Scenario: A field-replaceable I/O module in a test rack system that must connect to both 3.3V FPGA control logic and 5V analog front-end subsystems. IC Role / Device Role / Timing Role: Reconfigurable bus isolator and direction controller allowing dynamic assignment of data paths based on configuration EEPROM settings. Use Value: Enables single-board reuse across multiple product variants via software-defined T/R and OE control-reducing inventory SKUs and qualification effort. |
Use Scenario: Signal routing matrix in automated test equipment where DUT signals must be switched between 3.3V digital pattern generators and 5V legacy instrumentation interfaces. IC Role / Device Role / Timing Role: Low-latency, low-skew bidirectional switch supporting multi-channel parallel stimulus/response capture without added jitter. Use Value: Delivers consistent 1.2–4.0 ns propagation delay across all eight channels, preserving signal integrity for high-fidelity digital waveform analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVTH245MTCX | Incorporates bushold inputs eliminating need for external pull-ups; otherwise identical pinout, timing, and drive specs. | Preferred where unused inputs may float during configuration or partial power-down; adds ~0.2 mA ICCZ overhead. | Select 74LVTH245MTCX only if bushold functionality is required; 74LVT245MTCX remains optimal for cost-sensitive designs with controlled input biasing. |
| SN74LVC245APWR | Lower drive (24mA/24mA), wider VCC range (1.65–3.6V), no 5V-tolerant inputs-requires external level shifting for 5V bus interfacing. | Suitable for pure 3.3V or dual-supply 1.8V/3.3V systems; not interoperable with 5V TTL without additional components. | Choose SN74LVC245APWR only in fully 3.3V ecosystems; 74LVT245MTCX is mandatory for direct 5V bus integration. |
Compared with 74LVTH245MTCX, the 74LVT245MTCX offers lower static current and simpler input biasing but requires external pull-ups; versus SN74LVC245APWR, it provides superior 5V-tolerance and higher drive strength essential for legacy interface bridging.
Availability
74LVT245MTCX is available at Aetrix Electronics and suitable for industrial backplane interfaces, embedded memory expansion, modular I/O carrier boards, and test equipment signal routing requiring stable component supply across extended lifecycle programs.
Supply support for 74LVT245MTCX 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
ON Semiconductor (formerly Fairchild Semiconductor) is a global leader in intelligent power and sensing solutions, serving automotive, industrial, cloud, and consumer markets with energy-efficient semiconductor technologies.
The 74LVT245MTCX belongs to ON Semiconductor's legacy LVT logic family, engineered specifically for high-speed, low-voltage bus interfacing between 3.3V systems and 5V TTL infrastructure in industrial and communications equipment.
FAQ
What is the maximum operating frequency supported by the 74LVT245MTCX?
The 74LVT245MTCX does not specify a maximum clock frequency, but its propagation delay (tPLH/tPHL ≤ 4.0 ns at 3.3V, CL = 50 pF) supports reliable operation in synchronous bus systems up to approximately 250 MHz under ideal loading conditions. Actual achievable frequency depends on trace capacitance, termination, and fanout; design validation is required per application.
Does the 74LVT245MTCX have built-in bushold circuitry on its inputs?
No, the 74LVT245MTCX does not include bushold functionality. That feature is exclusive to the 74LVTH245MTCX variant. Unused inputs on the 74LVT245MTCX must be externally biased with pull-up or pull-down resistors to prevent floating states and ensure predictable logic behavior.
Can the 74LVT245MTCX safely interface with a 5V bus while powered from 3.3V?
Yes, the 74LVT245MTCX is explicitly designed for this use case: its inputs tolerate 0–5.5V regardless of VCC, and its outputs drive 5V-tolerant loads when VCC = 3.3V. This enables direct connection to 5V TTL buses without level-shifting components, as confirmed in the General Description and DC Electrical Characteristics tables.
What is the thermal performance rating of the 74LVT245MTCX in its TSSOP package?
The 74LVT245MTCX is rated for operation from –40°C to +85°C ambient temperature. Its TSSOP package (MTC20) has a typical junction-to-ambient thermal resistance (θJA) of ~160°C/W, and maximum power dissipation at 85°C is ~350 mW based on ICCL = 5 mA and VCC = 3.6V. Adequate PCB copper area is recommended for sustained high-drive operation.
Is the 74LVT245MTCX pin-compatible with other members of the LVT245 family?
Yes, the 74LVT245MTCX shares identical pinout and footprint with all 20-lead LVT245/LVTH245 variants-including 74LVT245WM, 74LVT245SJ, 74LVTH245MTCX, and 74LVTH245WM-regardless of package type (SOIC, SOP, SSOP, TSSOP). This enables drop-in substitution across packages when mechanical constraints allow.
74LVT245MTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74LVT245MTCX FAQ
1.How can I place an order for 74LVT245MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT245MTCX 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 74LVT245MTCX reliable?
The price and inventory of 74LVT245MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT245MTCX is usually 5 days.
3.What payment methods are accepted for 74LVT245MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT245MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT245MTCX?
74LVT245MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT245MTCX 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 74LVT245MTCX?
For technical support, including 74LVT245MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT245MTCX requirements.
6.How does Aetrix verify that 74LVT245MTCX is sourced from the original manufacturer or authorized distributors?
All 74LVT245MTCX 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 74LVT245MTCX meets industry standards.
7.What is the process for return or replacement of 74LVT245MTCX?
All 74LVT245MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT245MTCX, 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 74LVT245MTCX part is unused and in its original packaging.
Return procedure for 74LVT245MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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