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onsemi 74LVTH2245MTC
- Part No.:
- 74LVTH2245MTC
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVTH2245MTC.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,611
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Product details
Overview
74LVTH2245MTC from ON Semiconductor is a low-voltage octal bidirectional transceiver with 3-STATE inputs/outputs, bushold inputs on all data pins, and integrated 25Ω series resistors on B-port outputs. It operates at 2.7–3.6V VCC, supports 5V-tolerant I/O, delivers ±64mA drive on A port and ±12mA on B port, and is used in 3.3V bus interface applications between microcontrollers and legacy 5V peripherals.
For engineers reviewing the 74LVTH2245MTC datasheet, pinout, applications, or equivalent options, key selection criteria include bushold input retention, asymmetric drive strength (A vs. B port), 25Ω output damping for signal integrity, and TSSOP-20 packaging for high-density PCB layouts.
Technical Context
The 74LVTH2245MTC implements an octal non-inverting bidirectional buffer with independent 3-STATE control via OE and direction control via T/R. Data flows from A to B when T/R is HIGH and from B to A when T/R is LOW; OE HIGH disables both ports into high-impedance state.
Bushold circuitry actively holds unused inputs at their last valid logic level without external pull-ups, while the built-in 25Ω series resistor on each B-port output reduces switching overshoot/undershoot and improves EMI performance in high-speed bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - Ensures compatibility with standard 3.3V logic systems while maintaining noise margin. |
| I/O Voltage Tolerance | 0V to 5.5V - Allows safe interfacing with 5V buses without level shifters. |
| A Port Drive | –32mA / +64mA - Supports robust loading of multiple TTL inputs or moderate capacitive loads. |
| B Port Drive | –12mA / +12mA with 25Ω series resistor - Limits edge rate and ringing on point-to-point or lightly loaded stubs. |
| Propagation Delay | 1.2ns (min) to 4.0ns (max) - Enables operation in sub-250MHz bus cycles with tight timing budgets. |
| Bushold Current | ±75µA at VI = 0.8V/2.0V - Maintains stable logic state on floating inputs without external components. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and communications equipment. |
Pinout & Package
74LVTH2245MTC is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm wide, with 0.65mm pitch and exposed pad optional per manufacturer design guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-HIGH global disable: places both A and B ports in high-impedance state regardless of T/R state. |
| 2–9 (A0–A7) | Side A Bidirectional I/O | Non-inverting data path; driven by internal buffer when enabled; high-Z when OE=HIGH or T/R mismatch. |
| 10 (GND) | Ground Reference | Primary ground return for logic and output drivers; requires low-inductance connection for signal integrity. |
| 11–18 (B0–B7) | Side B Bidirectional I/O | Includes 25Ω series resistor per output; optimized for reduced EMI and controlled slew on B-side traces. |
| 19 (T/R) | Transmit/Receive Control | Active-HIGH enables A→B flow; active-LOW enables B→A flow; sampled synchronously with OE. |
| 20 (VCC) | Power Supply | 3.3V nominal supply; decoupling capacitor (0.1µF) required within 5mm of pin for transient current stability. |
Key Features
| Feature | Design Value |
|---|---|
| Bushold Inputs | Eliminates need for 10kΩ pull-up/pull-down resistors on all 16 data pins, reducing BOM count and board space. |
| Asymmetric Drive Strength | A port drives heavier loads (±64mA) for system-side fanout; B port (±12mA + 25Ω) targets clean point-to-point interconnect. |
| Live Insertion Support | Power-up/down high-impedance behavior prevents bus contention during hot-plug events in modular backplanes. |
| 5V-Tolerant I/O | Withstands 5.5V input voltage while powered from 3.3V, enabling direct connection to legacy 5V logic without clamping diodes. |
| Low ICCZ Current | 0.19mA typical supply current in 3-STATE mode - minimizes standby power in always-on bus arbitration circuits. |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Bus Extension |
|---|---|
Use Scenario: Interfacing a 3.3V ARM Cortex-M7 MCU to legacy 5V I/O modules across a 20cm backplane trace. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing data flow direction under software control via T/R, with OE coordinating multi-drop bus arbitration. Use Value: Bushold prevents floating inputs during reset; 25Ω B-port resistors suppress reflections on unterminated stubs, meeting EN55032 Class A emissions limits. | Use Scenario: Expanding GPIO count of a 3.3V SoC to drive eight 5V optocouplers in motor control feedback circuitry. IC Role / Device Role / Timing Role: Unidirectional driver (T/R fixed HIGH) with A-port sourcing 64mA to sink optocoupler LEDs, B-port providing 5V-tolerant return path. Use Value: Eliminates discrete level shifters and pull-ups; ±64mA A-port drive ensures full LED saturation without external transistor stages. |
| Telecom Line Card Data Multiplexing | Test Equipment Signal Routing Matrix |
Use Scenario: Time-division multiplexing of four 3.3V serial streams onto a shared 5V backplane bus in a modular line card. IC Role / Device Role / Timing Role: Octal transceiver synchronized to frame clock via OE gating, with T/R toggled per time slot to route data bidirectionally. Use Value: Sub-5ns propagation delay enables <10ns slot timing margins; 25Ω B-port termination matches characteristic impedance of controlled-impedance traces. | Use Scenario: Reconfigurable signal path routing in automated test equipment where DUT signals must be switched between 3.3V and 5V instrument channels. IC Role / Device Role / Timing Role: Manual or FPGA-controlled bidirectional switch enabling dynamic reassignment of test nodes without hardware change. Use Value: Live insertion support allows hot-swap of daughterboards; bushold maintains known state during reconfiguration sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | No bushold; no built-in series resistors; 3.3V-only I/O (not 5V-tolerant); lower drive (±24mA). | Suitable only for 3.3V-to-3.3V isolation; requires external termination and pull-ups for floating inputs. | Select when cost sensitivity outweighs 5V tolerance and signal integrity features. |
| 74ALVC162245TTR | 16-bit version in TSSOP-48; no bushold; no series resistors; 3.3V supply with 5.5V-tolerant inputs only. | Used in wider data paths (e.g., 16-bit memory expansion); lacks B-port damping and input hold functionality. | Choose for higher channel count where layout area permits larger package and external design effort is acceptable. |
Compared with 74LVTH2245MTC, SN74LVC245APWR offers lower cost but requires external components for 5V interface and floating input management, while 74ALVC162245TTR scales channel count at the expense of signal integrity features and bushold convenience.
Availability
74LVTH2245MTC is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller bus extensions, telecom line card multiplexing, and test equipment signal routing requiring stable component supply despite end-of-life status.
Supply support for 74LVTH2245MTC 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 supplier of energy-efficient semiconductor solutions for automotive, industrial, cloud computing, and IoT applications.
The 74LVTH2245MTC belongs to the LVT/LVTH family of low-voltage BiCMOS transceivers designed specifically for mixed-voltage bus interfacing in industrial and communications infrastructure where reliability, EMI control, and input retention are critical.
FAQ
Is 74LVTH2245MTC still in production?
No - 74LVTH2245MTC is discontinued and not recommended for new designs. ON Semiconductor lists it as obsolete in official documentation. However, Aetrix Electronics maintains limited legacy inventory with full traceability and supports ongoing production runs for existing programs through lifecycle coordination services.
What does "bushold" mean for 74LVTH2245MTC inputs?
Bushold is an active input-holding circuit integrated into each data pin of the 74LVTH2245MTC. It applies ±75µA bias current to retain the last valid logic state on floating inputs, eliminating external pull-up or pull-down resistors and preventing undefined states during power-up, reset, or unconnected pins.
Can 74LVTH2245MTC interface directly with 5V logic?
Yes - the 74LVTH2245MTC accepts input voltages up to 5.5V while operating from a 2.7–3.6V VCC, making it fully 5V-tolerant on all I/O pins. This allows direct connection to 5V peripherals without level-shifting circuitry, provided output loading remains within A/B port drive specifications.
Why does 74LVTH2245MTC have different drive strengths on A and B ports?
The 74LVTH2245MTC uses asymmetric drive (±64mA on A, ±12mA on B) to optimize system-level signal integrity: A port drives heavier bus loads (e.g., multiple TTL inputs), while B port's lower drive combined with 25Ω series resistors damps reflections on point-to-point links, reducing EMI and improving eye diagram margins.
What package type is used for 74LVTH2245MTC?
The 74LVTH2245MTC uses a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm wide with 0.65mm lead pitch. Its compact footprint supports high-density PCB layouts typical in industrial controllers and telecom modules.
74LVTH2245MTC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVTH
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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; 12mA, 12mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74LVTH2245MTC FAQ
1.How can I place an order for 74LVTH2245MTC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVTH2245MTC 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 74LVTH2245MTC reliable?
The price and inventory of 74LVTH2245MTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVTH2245MTC is usually 5 days.
3.What payment methods are accepted for 74LVTH2245MTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVTH2245MTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVTH2245MTC?
74LVTH2245MTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVTH2245MTC 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 74LVTH2245MTC?
For technical support, including 74LVTH2245MTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVTH2245MTC requirements.
6.How does Aetrix verify that 74LVTH2245MTC is sourced from the original manufacturer or authorized distributors?
All 74LVTH2245MTC 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 74LVTH2245MTC meets industry standards.
7.What is the process for return or replacement of 74LVTH2245MTC?
All 74LVTH2245MTC units undergo pre-shipment inspection (PSI). If there is an issue with 74LVTH2245MTC, 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 74LVTH2245MTC part is unused and in its original packaging.
Return procedure for 74LVTH2245MTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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