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Texas Instruments CD74ACT245SM96
- Part No.:
- CD74ACT245SM96
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
CD74ACT245SM96.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,950
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Product details
Overview
CD74ACT245SM96 from Texas Instruments is an octal non-inverting three-state bidirectional bus transceiver in SSOP-20 package, operating at 4.5V–5.5V supply, delivering ±24mA output drive, 9.1ns typical propagation delay (VCC = 5V), and 15pF output capacitance for high-speed digital bus interfacing in industrial control backplanes.
For engineers reviewing the CD74ACT245SM96 datasheet, CD74ACT245SM96 pinout, CD74ACT245SM96 application, or CD74ACT245SM96 equivalent, key selection criteria include its TTL-compatible input thresholds (VIH = 2.0V, VIL = 0.8V), robust 125°C operation, balanced propagation delays, and SSOP-20 footprint optimized for space-constrained PCB layouts.
Technical Context
The CD74ACT245SM96 implements Advanced CMOS Technology with SCR-latchup resistance and TTL-level input compatibility. Its DIR pin controls data direction (A→B or B→A), while OE enables three-state outputs-both logic inputs accept 0.8V/2.0V thresholds across –55°C to +125°C.
It features buffered inputs, 57pF power-dissipation capacitance, and simultaneous switching noise immunity verified via VOHV ≥4V and VOLP ≤1V at 25°C. Output drive supports fanout to 15 FAST™ ICs or direct 50Ω transmission-line termination without external termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V–5.5V - Enables direct interface with 5V TTL and CMOS systems without level-shifting. |
| Propagation Delay (tPLH/tPHL) | 2.7ns (typ), 10ns (max) at 5V - Supports >50MHz bus clock rates in synchronous data transfer. |
| Output Drive Current | ±24mA - Sufficient to drive 50Ω transmission lines or load 15 FAST™ inputs without signal degradation. |
| Input Thresholds | VIH = 2.0V, VIL = 0.8V - Full TTL compatibility ensures reliable interfacing with legacy 5V logic families. |
| Operating Temperature | –55°C to +125°C - Qualified for extended industrial, automotive under-hood, and military-grade applications. |
| Three-State Leakage | ±5µA max (VCC = 5.5V) - Minimizes standby current in high-density bus architectures with multiple transceivers. |
| Package | SSOP-20 (DB), 7.2mm × 7.8mm body - Surface-mount footprint with 0.65mm pitch, optimized for automated assembly and thermal performance. |
Pinout & Package
CD74ACT245SM96 uses a 20-pin Small Outline Shrink Plastic (SSOP-20, package code DB) with 0.65mm lead pitch and 2mm max height. The package body measures 7.2mm × 5.3mm (L×W), and overall outline is 7.2mm × 7.8mm including leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Determines data flow: DIR = LOW enables B→A transfer; DIR = HIGH enables A→B transfer. |
| 2–9 (A0–A7) | Bidirectional Bus A Port | Eight I/O pins connected to "A" side of bus; function as inputs or outputs depending on DIR and OE state. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output currents; must be low-impedance connection. |
| 11–18 (B0–B7) | Bidirectional Bus B Port | Eight I/O pins connected to "B" side of bus; mirror A-port behavior under DIR control. |
| 19 (OE) | Output Enable Input | Active-LOW: OE = HIGH forces all A/B outputs into high-impedance state, isolating both buses. |
| 20 (VCC) | Power Supply | Single 4.5V–5.5V supply powering all logic and output stages; requires local 0.1µF bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latchup-resistant process | Guarantees immunity to latch-up events under transient overvoltage or ESD stress in harsh environments. |
| ±24mA output drive | Enables direct 50Ω line driving and fanout to 15 FAST™ loads without external buffers or termination resistors. |
| Buffered inputs | Reduces capacitive loading on upstream drivers and improves noise margin by isolating internal logic nodes. |
| TTL-compatible input thresholds | VIH = 2.0V / VIL = 0.8V ensures seamless interoperability with standard 5V TTL, LVTTL, and older microcontroller I/O. |
| Balanced tPLH/tPHL delays | Minimizes duty-cycle distortion in clocked bus systems where symmetric rise/fall timing is critical. |
Applications
| Industrial Backplane Interface | Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Isolating and extending parallel address/data buses between PLC CPU modules and I/O expansion racks operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing A/B bus handshaking with precise 3-state control and fast propagation (<10ns). Use Value: Enables deterministic 5V bus arbitration across 1m+ cable runs using 50Ω impedance matching, reducing signal reflections and timing skew. |
Use Scenario: Adding external SRAM or peripheral interfaces (e.g., LCD controllers, ADCs) to resource-constrained 8-bit microcontrollers with limited GPIO count. IC Role / Device Role / Timing Role: Three-state bus buffer expanding MCU's multiplexed address/data bus to off-chip memory while maintaining strict timing budgets. Use Value: Delivers ±24mA drive and sub-10ns delay to meet tight setup/hold windows of asynchronous SRAM access cycles up to 20MHz. |
| Automotive Body Control Module | Test Equipment Data Acquisition |
|
Use Scenario: Interfacing legacy 5V sensor clusters (e.g., HVAC, lighting) with modern 3.3V domain controllers in vehicle body electronics. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional transceiver enabling safe, isolated communication between mixed-voltage subsystems. Use Value: Operates reliably at 125°C ambient and withstands automotive load-dump transients due to SCR-latchup-resistant design. |
Use Scenario: Multiplexing high-speed digital test signals (e.g., JTAG, SPI, parallel diagnostics) between FPGA-based test heads and DUTs in ATE systems. IC Role / Device Role / Timing Role: Low-skew, high-drive transceiver supporting glitch-free bus switching during real-time test pattern generation. Use Value: 15pF CO and 57pF CPD minimize dynamic power and crosstalk during simultaneous multi-bit toggling at >50MHz rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT245DBR | Same ACT logic family, identical 4.5–5.5V operation and ±24mA drive, but SOIC-20 (DW) package (12.8mm × 10.3mm). | Larger footprint and higher RθJA (98.6°C/W vs. 105.4°C/W) - less suitable for thermally dense layouts. | Select when board layout accommodates SOIC-20 and reflow profile matches Level-1-260C. |
| 74ACT245PC | PDIP-20 package (24.33mm × 9.4mm); same electrical specs but through-hole mounting and higher thermal resistance (69°C/W). | Designed for prototyping, legacy repair, or low-volume industrial assemblies requiring manual soldering. | Choose for breadboard evaluation or field-replaceable modules where surface-mount constraints do not apply. |
Compared with SN74ACT245DBR and 74ACT245PC, CD74ACT245SM96 offers the smallest PCB area (7.2mm × 7.8mm), highest thermal resistance (105.4°C/W), and optimized SSOP lead geometry for fine-pitch automated assembly - making it preferred for high-density, production-scale industrial and automotive PCBs.
Availability
CD74ACT245SM96 is available at Aetrix Electronics and suitable for industrial backplane interface, microcontroller bus expansion, and automotive body control module designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74ACT245SM96 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 high-reliability logic families.
CD74ACT245SM96 belongs to TI's Advanced CMOS Logic (ACT) product line, engineered for TTL-compatible 5V systems demanding low power, high speed, and robust operation across extreme temperatures.
FAQ
What is the maximum operating temperature for CD74ACT245SM96?
The CD74ACT245SM96 is rated for continuous operation from –55°C to +125°C, validated per manufacturer specifications across the full industrial and extended temperature range. This rating applies to the SSOP-20 (DB) package variant and is confirmed in the Absolute Maximum Ratings and Recommended Operating Conditions tables of the official TI datasheet SCHS245D.
Does CD74ACT245SM96 support 3.3V logic interfacing?
No - CD74ACT245SM96 is an ACT-family device designed exclusively for 4.5V–5.5V operation. Its input thresholds (VIH = 2.0V, VIL = 0.8V) and output voltage levels are specified only within that supply range. For 3.3V systems, TI recommends the AC-family variant (e.g., CD74AC245SM96) or dedicated level translators, not CD74ACT245SM96.
What is the pin 1 marking and orientation for CD74ACT245SM96?
CD74ACT245SM96 uses standard SSOP-20 pin 1 identification: a small circular index mark or beveled corner located at the top-left corner of the package body when viewed from the top with the leads pointing downward. Pin 1 resides in Quadrant Q1 of the tape-and-reel carrier, consistent with JEDEC MO-150 registration for DB packages.
How does the DIR pin control data direction in CD74ACT245SM96?
In CD74ACT245SM96, the DIR pin is an active-HIGH control: when DIR = HIGH, data flows from A-port (pins 2–9) to B-port (pins 11–18); when DIR = LOW, data flows from B-port to A-port. This bidirectional control operates independently of OE, which only enables/disables output drivers - DIR defines the signal path direction.
Is CD74ACT245SM96 RoHS compliant and lead-free?
Yes - CD74ACT245SM96 is RoHS compliant with lead finish NIPDAU (Nickel/Palladium/Gold), as documented in TI's PACKAGE OPTION ADDENDUM. 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, supporting standard 260°C peak reflow profiles.
CD74ACT245SM96 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
CD74ACT245SM96 FAQ
1.How can I place an order for CD74ACT245SM96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT245SM96 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 CD74ACT245SM96 reliable?
The price and inventory of CD74ACT245SM96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT245SM96 is usually 5 days.
3.What payment methods are accepted for CD74ACT245SM96?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT245SM96 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT245SM96?
CD74ACT245SM96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT245SM96 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 CD74ACT245SM96?
For technical support, including CD74ACT245SM96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT245SM96 requirements.
6.How does Aetrix verify that CD74ACT245SM96 is sourced from the original manufacturer or authorized distributors?
All CD74ACT245SM96 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 CD74ACT245SM96 meets industry standards.
7.What is the process for return or replacement of CD74ACT245SM96?
All CD74ACT245SM96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT245SM96, 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 CD74ACT245SM96 part is unused and in its original packaging.
Return procedure for CD74ACT245SM96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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