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Texas Instruments SN74ABT2245PWR
- Part No.:
- SN74ABT2245PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT2245PWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,496
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Product details
Overview
SN74ABT2245PWR from Texas Instruments is an octal transceiver and line driver with 3-state outputs, designed for asynchronous bidirectional data bus communication between A and B buses. It features direction control (DIR), output enable (OE), B-port outputs with integrated 25-Ω series resistors, and operates over –40°C to 85°C at 4.5–5.5 V supply. Used in industrial backplane interfaces and legacy bus isolation.
For engineers reviewing the SN74ABT2245PWR datasheet, SN74ABT2245PWR pinout, SN74ABT2245PWR application, or SN74ABT2245PWR equivalent, key selection criteria include 3-state bus isolation timing (tPLH/tPHL ≤ 4 ns), B-port sink capability (12 mA), A-port drive strength (64 mA), high-impedance state during power-up/down, and TSSOP-20 package compatibility with IPC-7351 land patterns.
Technical Context
This device implements a dual-bus transceiver architecture with independent DIR and OE controls, enabling configurable unidirectional or bidirectional data flow. The B-port outputs integrate on-die 25-Ω series termination to suppress overshoot/undershoot without external resistors, while A-port outputs deliver higher drive (64 mA sink) for MOS/line loading.
It employs TI's EPIC-IIB BiCMOS process for low power dissipation and robust latch-up immunity (>500 mA per JESD-17). The device enters high-impedance state when VCC is below 2.1 V, and requires OE tied to VCC via pullup resistor above that threshold to guarantee isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and mixed-voltage system rails. |
| A-port Output Sink Current | 64 mA - Supports direct driving of multiple TTL loads or MOS gate capacitances without buffering. |
| B-port Output Sink Current | 12 mA - Optimized for controlled-impedance transmission lines; integrated 25-Ω series resistor reduces EMI. |
| Propagation Delay (A→B) | 1 ns (min) to 4 ns (max) at 5 V - Enables reliable operation in high-speed parallel bus systems up to ~100 MHz effective rate. |
| Power-Up High-Impedance | Active below 2.1 V VCC - Prevents bus contention during power sequencing without external reset logic. |
| ESD Protection | >2000 V HBM, >200 V MM - Meets MIL-STD-833 and machine-model requirements for industrial handling robustness. |
| Operating Temperature | –40°C to +85°C - Qualified for commercial and extended-temperature industrial environments. |
Pinout & Package
TSSOP-20 (PW) package: 6.95 mm × 4.4 mm × 1.2 mm body, 0.65 mm pitch, lead-free NiPdAu finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: LOW enables B→A transfer; HIGH enables A→B transfer. |
| 2–9 | A1–A8 | A-side bidirectional I/O pins - connect to primary data bus; driven by internal buffers when enabled. |
| 10 | GND | Ground reference for all logic and output stages - must be low-impedance connection. |
| 11–18 | B1–B8 | B-side bidirectional I/O pins - feature integrated 25-Ω series resistance for clean signal integrity. |
| 19 | OE | Output enable active-low - HIGH disables both A and B ports into high-impedance state. |
| 20 | VCC | Positive supply rail - decoupling capacitor (0.1 µF) required adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| B-port integrated 25-Ω series termination | Eliminates need for 16 external resistors in point-to-point or stubbed bus topologies, reducing BOM count and layout area. |
| EPIC-IIB BiCMOS process | Reduces dynamic power vs. standard bipolar TTL while maintaining 5-V logic compatibility and fast switching. |
| High-impedance during power ramp | Prevents bus contention during cold start or brownout conditions without requiring external power-monitoring circuitry. |
| Latch-up immunity >500 mA | Exceeds JEDEC JESD-17 - ensures reliability in noisy industrial environments with transient coupling. |
| 3.3-V tolerant inputs | Accepts 3.3-V logic levels directly on DIR and OE pins when VCC = 5 V - simplifies mixed-voltage interface design. |
Applications
| Industrial Backplane Interface | Legacy System Bus Isolation |
|---|---|
Use Scenario: Isolating CPU local bus from peripheral expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional transceiver managing data flow between microcontroller and I/O modules under DIR/OE control. Use Value: Integrated B-port termination eliminates stub reflections on 10-cm PCB traces; 4 ns max propagation delay supports 25-MHz bus clocking. |
Use Scenario: Interfacing ISA or VMEbus peripherals to modern FPGA-based controllers with voltage translation. IC Role / Device Role / Timing Role: Level-shifting and bus-separation element enabling safe hot-swap insertion of legacy cards. Use Value: Power-up high-impedance prevents bus contention during card insertion; 64 mA A-port drive handles TTL fanout requirements. |
| Test Equipment Data Path | Automated Test Fixture Control |
Use Scenario: Routing stimulus/response signals between DUT interface and pattern generator in ATE systems. IC Role / Device Role / Timing Role: Directionally configurable data path switch supporting both stimulus injection and response capture modes. Use Value: Sub-4 ns propagation delay ensures precise timing alignment; OE-controlled isolation prevents signal leakage during test mode transitions. |
Use Scenario: Controlling multiple relay banks and sensor readbacks in semiconductor handler test fixtures. IC Role / Device Role / Timing Role: Parallel I/O expander providing isolated control and status monitoring across 16-bit wide control bus. Use Value: B-port 12 mA sink capability drives LED indicators and optocoupler inputs directly; ESD rating protects against handler ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245PW | Same ABT family, identical pinout and electrical specs, but includes separate A/B enable controls instead of single OE. | Supports independent A→B and B→A enablement - useful where asymmetric bus arbitration is required. | Select SN74ABT245PW only if independent port control is needed; otherwise SN74ABT2245PWR offers simpler OE logic. |
| SN74LVC245APW | Lower voltage (1.65–3.6 V), CMOS-based, 24 mA drive, no integrated B-port termination. | Designed for 3.3-V systems; requires external 25-Ω resistors on B side for equivalent signal integrity. | Choose SN74LVC245APW for battery-powered or low-power 3.3-V designs; not drop-in compatible due to voltage and termination differences. |
Compared with SN74ABT245PW and SN74LVC245APW, the SN74ABT2245PWR provides optimal balance of 5-V compatibility, integrated B-port termination, and single-OE simplicity for industrial bus isolation - eliminating layout complexity and component count where full bidirectional control suffices.
Availability
SN74ABT2245PWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus isolation, automated test fixture control, and instrumentation data path routing requiring stable component supply and long-term manufacturability.
Supply support for SN74ABT2245PWR 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 industry-standard logic families.
The SN74ABT2245PWR belongs to TI's ABT-series advanced bi-directional transceivers, engineered for robust 5-V bus interfacing in industrial automation, test equipment, and legacy system upgrades where signal integrity and power-up safety are critical.
FAQ
What is the maximum operating frequency supported by SN74ABT2245PWR?
The SN74ABT2245PWR does not specify a maximum clock frequency, but its propagation delay (tPLH/tPHL ≤ 4 ns) and enable/disable times (tPZL/tPHZ ≤ 6 ns) support reliable operation in parallel bus systems with effective data rates up to 100 MHz. System-level timing must account for trace length, loading, and setup/hold margins. The SN74ABT2245PWR is commonly deployed in 25–40 MHz bus applications.
Does SN74ABT2245PWR require external pull-up resistors on DIR or OE pins?
OE must be tied to VCC through a pull-up resistor (minimum value determined by driver sink capability) to ensure high-impedance state above 2.1 V VCC; DIR may float only if actively driven, but TI recommends tying unused control inputs high or low. The SN74ABT2245PWR datasheet specifies that floating inputs increase ICC and risk metastability - so external pull-ups are strongly advised for OE and optional for DIR in uncontrolled environments.
Can SN74ABT2245PWR interface directly between 5-V and 3.3-V buses?
No - the SN74ABT2245PWR is a 5-V-only device (VCC = 4.5–5.5 V) with TTL-compatible inputs. While its DIR and OE inputs tolerate 3.3-V logic levels when VCC = 5 V, the A/B I/O pins swing rail-to-rail and are not 3.3-V tolerant. Direct connection to 3.3-V buses risks damage or incorrect logic levels. Use level translators like SN74AVC4T245 for true 3.3-V ↔ 5-V interfacing.
What is the thermal resistance (θJA) of SN74ABT2245PWR in its TSSOP-20 package?
The SN74ABT2245PWR in the PW (TSSOP-20) package has a specified junction-to-ambient thermal resistance (θJA) of 128°C/W under standard JEDEC test conditions (1-layer board, 1 in² copper). This value assumes minimal PCB copper; actual θJA improves significantly with internal ground/power planes and thermal vias. Derating is required above 70°C ambient for continuous 64-mA A-port loading.
Is SN74ABT2245PWR RoHS compliant and lead-free?
Yes - SN74ABT2245PWR is RoHS compliant with lead-free NiPdAu terminal finish, per TI's packaging documentation. It carries MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH) and is qualified for Pb-free reflow per JEDEC J-STD-020. The "G4" suffix in variants like SN74ABT2245PWRG4 explicitly denotes green (halogen-free) and RoHS-compliant packaging.
SN74ABT2245PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74ABT2245PWR FAQ
1.How can I place an order for SN74ABT2245PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2245PWR 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 SN74ABT2245PWR reliable?
The price and inventory of SN74ABT2245PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT2245PWR is usually 5 days.
3.What payment methods are accepted for SN74ABT2245PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT2245PWR transactions.
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4.How is shipping managed for SN74ABT2245PWR?
SN74ABT2245PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT2245PWR 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 SN74ABT2245PWR?
For technical support, including SN74ABT2245PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2245PWR requirements.
6.How does Aetrix verify that SN74ABT2245PWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT2245PWR 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 SN74ABT2245PWR meets industry standards.
7.What is the process for return or replacement of SN74ABT2245PWR?
All SN74ABT2245PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2245PWR, 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 SN74ABT2245PWR part is unused and in its original packaging.
Return procedure for SN74ABT2245PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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