My Inquiry
My Account
Texas Instruments SN74ABT2245NG4
- Part No.:
- SN74ABT2245NG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT2245NG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,732
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ABT2245NG4 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), 25-Ω integrated series resistors on B-port outputs, ±12 mA B-port drive, and 64 mA A-port sink capability at VCC = 4.5–5.5 V. It operates from –40°C to 85°C and supports high-speed logic interfacing in industrial backplane and memory expansion systems.
For engineers reviewing the SN74ABT2245NG4 datasheet, SN74ABT2245NG4 pinout, SN74ABT2245NG4 application, or SN74ABT2245NG4 equivalent, key selection criteria include bidirectional bus isolation timing (tPLH/tPHL ≤ 4.5 ns), 3-state control robustness during power sequencing, B-port slew rate control via internal 25-Ω resistors, and compatibility with TTL/CMOS logic families across 4.5–5.5 V supply.
Technical Context
The SN74ABT2245NG4 implements a dual-octet bidirectional transceiver architecture with independent DIR and OE controls. Its EPIC-II™ BiCMOS process enables low propagation delay (≤4.5 ns) while maintaining high noise immunity and latch-up resistance (>500 mA per JESD-17). The device enters high-impedance state during power-up/down when VCC is below 2.1 V.
B-port outputs integrate 25-Ω series resistors to suppress overshoot/undershoot without external components; A-port outputs are optimized for higher current drive (64 mA sink) but lack built-in termination. Input thresholds meet standard TTL levels (VIH = 2 V, VIL = 0.8 V), and output voltage specs guarantee VOH ≥ 2.5 V (A port, IOH = –24 mA) and VOL ≤ 0.55 V (A port, IOL = 48 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5 V rail tolerances. |
| A-port IOL | 64 mA max - Supports direct driving of multiple TTL loads or terminated transmission lines. |
| B-port IOH/IOL | ±12 mA - Matches MOS/low-power logic interface requirements with controlled edge rates. |
| tPLH / tPHL (A→B) | 1–4 ns - Enables reliable 200+ MHz bus handshaking in synchronous backplane designs. |
| IOZH / IOZL | ±10 µA - Guarantees minimal leakage in 3-state isolation mode, critical for multi-drop bus integrity. |
| Input Clamp Current | –18 mA - Protects inputs against transient overvoltage events per MIL-STD-833. |
| Thermal Resistance θJA | 67°C/W (PDIP-N) - Allows full-output operation up to 85°C ambient without forced cooling. |
Pinout & Package
SN74ABT2245NG4 is supplied in a 20-pin plastic DIP (N) package, 6.35 mm wide, 25.4 mm long, 4.57 mm height, with 2.54 mm lead pitch and through-hole mounting. Pin 1 is marked by a notch or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: LOW enables B→A data flow; HIGH enables A→B data flow. |
| 2–9 | A1–A8 | A-side bidirectional data terminals - connected to local bus or controller side. |
| 10 | GND | Ground reference for all logic and power domains. |
| 11–18 | B1–B8 | B-side bidirectional data terminals - connected to peripheral or expansion bus. |
| 19 | OE | Output enable: LOW activates transceiver; HIGH forces all outputs into high-impedance state. |
| 20 | VCC | Positive supply input (4.5–5.5 V) - powers internal BiCMOS circuitry and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω B-port series resistors | Eliminates need for external termination resistors, reducing PCB component count and layout complexity for high-speed bus stubs. |
| High-impedance during power sequencing | Automatically isolates buses when VCC is between 0–2.1 V, preventing signal contention during system power-up/down transitions. |
| Latch-up immunity >500 mA | Meets JEDEC JESD-17, enabling safe operation in noisy industrial environments with ground bounce or ESD coupling. |
| EPIC-II™ BiCMOS process | Combines bipolar speed and CMOS low static power, achieving <1 V typical ground bounce (VOLP) at 5 V/25°C. |
| TTL-compatible input thresholds | VIH = 2 V, VIL = 0.8 V - ensures interoperability with legacy 5 V logic families without level-shifting circuitry. |
Applications
| Industrial Backplane Interface | Memory Expansion Subsystem |
|---|---|
|
Use Scenario: Bidirectional data transfer between CPU module and peripheral card across a 20 cm, 50 Ω-terminated backplane. IC Role / Device Role / Timing Role: Bus transceiver providing direction-controlled, low-skew data routing with integrated B-port termination. Use Value: Eliminates four external 25-Ω resistors per B-port line, reduces signal reflections, and maintains tPLH/tPHL ≤ 4.5 ns across temperature. |
Use Scenario: Interfacing a microcontroller's address/data bus to parallel SRAM or Flash memory with separate read/write control paths. IC Role / Device Role / Timing Role: Directionally configurable octal buffer enabling shared bus arbitration between processor and memory devices. Use Value: 64 mA A-port sink capability drives heavy capacitive loads; OE-controlled isolation prevents memory corruption during DMA cycles. |
| Legacy System Bus Extender | Industrial PLC I/O Module |
|
Use Scenario: Extending a 5 V TTL ISA-style bus across two PCBs using ribbon cable, requiring impedance-matched signal integrity. IC Role / Device Role / Timing Role: Line driver/transceiver with matched B-port output impedance and fast 3-state enable/disable timing. Use Value: Internal 25-Ω resistors suppress ringing on 30 cm cables; tPZL/tPHZ ≤ 6 ns ensures clean bus release before next cycle. |
Use Scenario: Isolating field-side digital I/O signals from controller-side logic in programmable logic controllers with hot-swap capability. IC Role / Device Role / Timing Role: Bidirectional data isolator enabling safe insertion/removal of I/O modules without disrupting main bus operation. Use Value: High-impedance state at VCC < 2.1 V prevents bus contention during module power-up; ±12 mA B-port drive matches optocoupler input requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245N | Same pinout, identical electrical specs, but lacks B-port 25-Ω series resistors; requires external termination. | Suitable where board-level termination is preferred or B-port loading differs significantly. | Select SN74ABT245N only if external resistor placement is acceptable and B-port signal integrity is managed at layout level. |
| SN74LVC245APW | 3.3 V only (1.65–3.6 V), lower drive (24 mA), no integrated B-port resistors, TSSOP-20 package. | Designed for modern low-voltage embedded systems; incompatible with 5 V buses without level translation. | Choose SN74LVC245APW for new 3.3 V designs prioritizing power efficiency over legacy 5 V compatibility. |
Compared with SN74ABT245N and SN74LVC245APW, SN74ABT2245NG4 uniquely delivers integrated 25-Ω B-port termination for 5 V bus systems, enabling drop-in replacement in legacy industrial backplanes without layout revision-while maintaining full 5 V tolerance, high-current drive, and robust power-sequence behavior.
Availability
SN74ABT2245NG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion subsystems, legacy system bus extenders, and PLC I/O modules requiring stable component supply, long-term obsolescence management, and RoHS-compliant through-hole packaging.
Supply support for SN74ABT2245NG4 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 ABT logic family-including SN74ABT2245NG4-is engineered for high-speed, low-noise 5 V bus interfacing in industrial, military, and telecom infrastructure, emphasizing robustness, timing precision, and compatibility with legacy TTL systems.
FAQ
What is the maximum operating temperature range for SN74ABT2245NG4?
The SN74ABT2245NG4 is characterized for operation from –40°C to +85°C, making it suitable for industrial environments including factory automation, motor control cabinets, and outdoor telecom enclosures where ambient temperatures exceed commercial-grade limits. This rating applies specifically to the N-package variant and is validated per TI's production test conditions.
Does SN74ABT2245NG4 require external pull-up resistors on OE or DIR pins?
SN74ABT2245NG4 does not require pull-ups on DIR, but OE should be tied to VCC via a pull-up resistor when guaranteed high-impedance state above 2.1 V is needed-especially during partial power-up. TI specifies minimum resistor value based on driver sourcing capability; 10 kΩ is commonly used and verified in reference designs for SN74ABT2245NG4.
Can SN74ABT2245NG4 drive a 50 Ω transmission line directly?
Yes-SN74ABT2245NG4's B-port outputs integrate 25-Ω series resistors, enabling direct connection to 50 Ω PCB traces or cables when paired with proper termination at the far end. This eliminates discrete resistors and improves signal fidelity for lengths up to 20 cm at 100 Mbps, as confirmed in TI's application notes for SN74ABT2245NG4.
Is SN74ABT2245NG4 pin-compatible with SN74ABT245N?
Yes-SN74ABT2245NG4 and SN74ABT245N share identical 20-pin PDIP (N) package dimensions, pinout, and footprint. However, SN74ABT2245NG4 includes integrated 25-Ω B-port resistors while SN74ABT245N does not; substituting one for the other requires verifying whether external termination is already present in the design for SN74ABT2245NG4.
What is the typical ground bounce (VOLP) performance of SN74ABT2245NG4?
SN74ABT2245NG4 exhibits typical output ground bounce (VOLP) < 1 V at VCC = 5 V and TA = 25°C, measured under worst-case switching conditions. This low VOLP-enabled by EPIC-II™ BiCMOS design-reduces noise coupling into adjacent signals and improves system-level noise margin, a key specification validated in TI's characterization report for SN74ABT2245NG4.
SN74ABT2245NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ABT2245NG4 FAQ
1.How can I place an order for SN74ABT2245NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2245NG4 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 SN74ABT2245NG4 reliable?
The price and inventory of SN74ABT2245NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT2245NG4 is usually 5 days.
3.What payment methods are accepted for SN74ABT2245NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT2245NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT2245NG4?
SN74ABT2245NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT2245NG4 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 SN74ABT2245NG4?
For technical support, including SN74ABT2245NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2245NG4 requirements.
6.How does Aetrix verify that SN74ABT2245NG4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT2245NG4 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 SN74ABT2245NG4 meets industry standards.
7.What is the process for return or replacement of SN74ABT2245NG4?
All SN74ABT2245NG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2245NG4, 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 SN74ABT2245NG4 part is unused and in its original packaging.
Return procedure for SN74ABT2245NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ABT2245NG4 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
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…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
