My Inquiry
My Account
onsemi 74LVT2245SJ
- Part No.:
- 74LVT2245SJ
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
74LVT2245SJ.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,438
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74LVT2245 from Fairchild Semiconductor is a low-voltage octal bidirectional transceiver with 3-STATE inputs/outputs and integrated 25Ω series resistors on B-port outputs, designed for 3.3V VCC bus interfacing between 3.3V and 5V systems. It features ±12mA/±64mA drive capability on B/A ports respectively, operates across –40°C to +85°C, and supports live insertion/extraction in industrial backplane applications.
For engineers reviewing the 74LVT2245 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, directional control logic (T/R and OE), B-port slew control via on-die termination, and validated alternatives for 3.3V–5V level-shifting transceiver selection.
Technical Context
The 74LVT2245 implements dual-bus bidirectional data flow controlled by active-HIGH Transmit/Receive (T/R) and active-HIGH Output Enable (OE) signals: T/R = HIGH enables A→B transfer; T/R = LOW enables B→A transfer; OE = HIGH forces both ports into high-impedance state. Its BiCMOS process delivers ABT-class speed with LVT power efficiency.
Unlike the bushold-equipped 74LVTH2245, the 74LVT2245 lacks bushold inputs-requiring external pull-up/pull-down for unused data pins. The 25Ω series resistor on each B-port output is fixed and non-bypassable, reducing overshoot/undershoot without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - Ensures compatibility with 3.3V logic rails while tolerating supply variation in industrial environments. |
| A-Port IOL/IOH | 64mA / –32mA - Supports high-drive 3.3V bus loading, e.g., driving multiple TTL inputs or stub-loaded traces. |
| B-Port IOL/IOH | 12mA / –12mA - Lower drive matches 5V-tolerant receivers; 25Ω series resistor limits edge rate for EMI reduction. |
| tPLH/tPHL (A Port) | 1.2ns to 4.0ns @ 3.3V - Enables >200MHz bus operation with tight skew (<1.0ns) across all eight channels. |
| Input Voltage Range | 0V to 5.5V - Allows direct connection to 5V CMOS/TTL buses without level shifters on data or control lines. |
| Power-Up High-Z | Guaranteed during VCC ramp - Prevents bus contention at power-on, eliminating need for reset sequencing in hot-swap systems. |
Pinout & Package
74LVT2245SJ is housed in a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm wide (Package Code M20D), with standard 1.27mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-HIGH control: drives both A and B ports into 3-STATE when HIGH; required for bus isolation during arbitration. |
| 2 (A0) | Side-A Data I/O | Bi-directional terminal: functions as input when T/R = LOW (B→A), output when T/R = HIGH (A→B). |
| 3 (A1) | Side-A Data I/O | Identical behavior to A0; all A0–A7 share same directionality and drive strength (±32mA/±64mA). |
| 4 (A2) | Side-A Data I/O | Same timing and voltage tolerance as A0–A7; no internal pull-up or bushold. |
| 5 (A3) | Side-A Data I/O | Supports hot-plug operation only when OE and T/R are controlled before VCC stabilization. |
| 6 (A4) | Side-A Data I/O | Compatible with 5V-tolerant inputs; VIH = 2.0V min ensures reliable recognition of 3.3V logic HIGH from upstream drivers. |
| 7 (A5) | Side-A Data I/O | Low input capacitance (4pF) minimizes loading on source clocks or microcontroller GPIOs. |
| 8 (A6) | Side-A Data I/O | Shared VCC and GND with B-side; requires decoupling near pin 20 and pin 10 for noise immunity. |
| 9 (A7) | Side-A Data I/O | Final A-side channel; identical AC/DC specs to A0–A6 per datasheet Table 4 and 5. |
| 10 (GND) | Ground Reference | Primary ground return for all I/O and internal logic; must be low-inductance connection to system plane. |
| 11 (B7) | Side-B Data I/O | B-port outputs include 25Ω series resistance; limits dI/dt to reduce EMI and signal integrity issues on long traces. |
| 12 (B6) | Side-B Data I/O | Lower drive (±12mA) optimized for 5V receiver interfaces; VOL = 0.8V max @ 12mA ensures TTL-compliant LOW. |
| 13 (B5) | Side-B Data I/O | No bushold - unused B pins must be externally terminated to avoid floating inputs and potential oscillation. |
| 14 (B4) | Side-B Data I/O | VI = 0V to 5.5V tolerance allows direct connection to legacy 5V peripherals without external level translation. |
| 15 (B3) | Side-B Data I/O | 25Ω resistor is internal and non-removable; cannot be bypassed or disabled via control pin. |
| 16 (B2) | Side-B Data I/O | Propagation delay asymmetry (tPLH vs tPHL) <0.3ns ensures minimal duty-cycle distortion on clocked data paths. |
| 17 (B1) | Side-B Data I/O | Capacitance CI/O = 8pF - lower than typical 10–12pF for comparable transceivers, improving high-speed signal fidelity. |
| 18 (B0) | Side-B Data I/O | First B-side channel; shares same 25Ω series resistance and DC specs as B1–B7. |
| 19 (T/R) | Transmit/Receive Control | Active-HIGH enables A→B data flow; active-LOW enables B→A; transition must occur only when OE = LOW to avoid bus conflict. |
| 20 (VCC) | Supply Voltage | 3.3V nominal; accepts 2.7–3.6V range; ICCZ = 0.19mA in 3-STATE reduces standby power in idle bus segments. |
Key Features
| Feature | Design Value |
|---|---|
| 25Ω B-port series termination | Integrated resistor eliminates discrete components and layout uncertainty for EMI-sensitive 5V interface traces. |
| 5V-tolerant inputs/outputs | Accepts 0–5.5V input voltage and drives 5V loads directly, enabling seamless interconnection with legacy TTL/CMOS systems. |
| Live insertion/extraction support | Power-up/down high-impedance behavior prevents bus glitches during hot-swap events in modular backplanes or card cages. |
| High-speed BiCMOS architecture | Delivers 1.2ns minimum propagation delay with sub-nanosecond skew, matching ABT performance at LVT power levels. |
| Robust ESD protection | Human-body model >2000V ensures reliability during handling and board assembly without additional protection circuitry. |
Applications
| Industrial Backplane Interface | 3.3V-to-5V Level Translation |
|---|---|
|
Use Scenario: Interfacing a 3.3V FPGA-based controller to legacy 5V peripheral cards in a programmable logic controller (PLC) rack. IC Role / Device Role / Timing Role: Bidirectional data transceiver managing command/response traffic between CPU and I/O modules over parallel bus. Use Value: Eliminates need for eight discrete level shifters; 25Ω B-port termination suppresses reflections on 10cm+ backplane traces. |
Use Scenario: Connecting a 3.3V microcontroller GPIO port to 5V sensors and actuators in an automotive body control module. IC Role / Device Role / Timing Role: Voltage-level agnostic data buffer enabling safe bidirectional communication without external resistive dividers. Use Value: 5.5V input tolerance protects MCU pins from 5V fault conditions; ±12mA B-port drive meets sensor interface sink requirements. |
| Hot-Swappable Module Interface | Embedded System Expansion Bus |
|
Use Scenario: Enabling hot-plug capability for daughterboards in a medical imaging subsystem where modules may be replaced during operation. IC Role / Device Role / Timing Role: Isolation transceiver ensuring glitch-free bus disconnection/reconnection using OE and T/R coordination. Use Value: Power-up high-Z guarantees no bus contention at insertion; live insertion rating simplifies mechanical design and firmware. |
Use Scenario: Extending a 3.3V SoC's parallel memory/data bus to external SRAM or FPGA configuration PROM in a network appliance. IC Role / Device Role / Timing Role: Octal bidirectional buffer providing timing-matched data path expansion with minimal added latency. Use Value: Sub-4ns propagation delay preserves setup/hold margins; low 4pF input capacitance avoids degrading clock tree integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC2245PW | 3.3V-only I/O (no 5V tolerance); 24mA/24mA drive on both ports; no built-in series resistor. | Suitable only in fully 3.3V systems; requires external termination for EMI control on longer traces. | Select when cost and board space are prioritized over 5V interoperability and integrated B-port damping. |
| SN74LVC8T245RHLR | Higher drive (32mA/32mA both sides); 3.3V VCC with 5.5V-tolerant I/O; no internal series resistor. | Requires external 25Ω resistors on B-side if EMI mitigation is needed; wider 3.5mm × 4.5mm QFN package. | Choose for higher current drive and smaller footprint, accepting added BOM and layout complexity for termination. |
Compared with 74LVT2245, the 74LVC2245PW offers lower cost but sacrifices 5V interface capability and integrated B-port damping, while the SN74LVC8T245RHLR provides superior drive strength and modern packaging but shifts termination responsibility to the PCB designer.
Availability
74LVT2245SJ is available at Aetrix Electronics and suitable for industrial backplane interfaces, 3.3V-to-5V level translation, hot-swappable module designs, and embedded expansion bus applications requiring stable component supply and long-term obsolescence management.
Supply support for 74LVT2245SJ 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, power management, and interface solutions before its acquisition by ON Semiconductor in 2016.
The 74LVT2245 belongs to Fairchild's Low-Voltage Transceiver (LVT) family, engineered for high-speed, low-power bidirectional bus interfacing between 3.3V logic and 5V legacy systems in industrial and telecom infrastructure.
FAQ
What is the maximum operating temperature range for the 74LVT2245SJ?
The 74LVT2245SJ is rated for free-air operating temperatures from –40°C to +85°C, as specified in the Recommended Operating Conditions table. This range supports deployment in industrial control cabinets, outdoor telecom enclosures, and automotive under-hood auxiliary systems where ambient thermal stress is present. All DC and AC electrical characteristics in the datasheet are guaranteed across this full range.
Does the 74LVT2245SJ include bushold circuitry on its inputs?
No, the 74LVT2245SJ does not include bushold circuitry. Bushold is exclusive to the 74LVTH2245 variant. The 74LVT2245SJ requires external pull-up or pull-down resistors on unused A0–A7 and B0–B7 inputs to prevent floating states and potential oscillation. This distinction is explicitly stated in the Features section and General Description of the datasheet.
Can the 25Ω series resistor on the B port of the 74LVT2245SJ be disabled or bypassed?
No, the 25Ω series resistor on each B-port output of the 74LVT2245SJ is permanently integrated into the silicon and cannot be disabled, bypassed, or configured via any control pin or external signal. It is a fixed, non-removable feature intended to dampen edge rates and reduce EMI on 5V-tolerant outputs, as confirmed in the General Description and Features sections.
What is the recommended decoupling strategy for the 74LVT2245SJ?
Place a 0.1µF ceramic capacitor between VCC (pin 20) and GND (pin 10) as close as possible to the device body. For systems with high-frequency switching or multiple transceivers, add a 4.7µF bulk capacitor within 1 inch of the 74LVT2245SJ. Avoid shared vias between decoupling caps and other ICs to maintain low-impedance local supply paths and minimize ground bounce.
Is the 74LVT2245SJ pin-compatible with the 74LVTH2245SJ?
Yes, the 74LVT2245SJ and 74LVTH2245SJ share identical pinout, package (M20D SOP), and functional mapping-including OE, T/R, A0–A7, and B0–B7 assignments. The only functional difference is the presence of bushold on LVTH inputs; all timing, drive strength, and electrical interface specifications remain consistent across both variants for drop-in replacement in non-bushold-required designs.
74LVT2245SJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVT
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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-SOP
74LVT2245SJ FAQ
1.How can I place an order for 74LVT2245SJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT2245SJ 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 74LVT2245SJ reliable?
The price and inventory of 74LVT2245SJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT2245SJ is usually 5 days.
3.What payment methods are accepted for 74LVT2245SJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT2245SJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT2245SJ?
74LVT2245SJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT2245SJ 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 74LVT2245SJ?
For technical support, including 74LVT2245SJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT2245SJ requirements.
6.How does Aetrix verify that 74LVT2245SJ is sourced from the original manufacturer or authorized distributors?
All 74LVT2245SJ 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 74LVT2245SJ meets industry standards.
7.What is the process for return or replacement of 74LVT2245SJ?
All 74LVT2245SJ units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT2245SJ, 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 74LVT2245SJ part is unused and in its original packaging.
Return procedure for 74LVT2245SJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74LVT2245SJ Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
