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Texas Instruments SN74ABTH245DBR
- Part No.:
- SN74ABTH245DBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABTH245DBR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,892
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Product details
Overview
SN74ABTH245DBR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in industrial and embedded systems. It features ±32-mA high-drive outputs, bus-hold circuitry eliminating external pull resistors, Ioff support for hot insertion, and operates over –40°C to 85°C at 4.5–5.5 V supply.
For engineers reviewing the SN74ABTH245DBR datasheet, SN74ABTH245DBR pinout, SN74ABTH245DBR application, or SN74ABTH245DBR equivalent, this page delivers verified electrical specs, thermal performance (θJA = 70°C/W), switching timing (tPLH/tPHL ≤ 3.6 ns), bus-hold behavior, and hot-swap design guidance - all specific to the DB-package variant.
Technical Context
The SN74ABTH245DBR implements EPIC-IIB BiCMOS logic to achieve low power dissipation while delivering high-current drive capability. Its direction-control (DIR) and output-enable (OE) inputs govern bidirectional data flow and 3-state isolation, with power-up/power-down high-impedance behavior activated when VCC is below 2.1 V.
Bus-hold circuitry actively maintains valid logic levels on floating A/B port inputs without external components. Ioff protection disables outputs during power-off, preventing backflow current - a critical requirement for live-insertion backplane and modular system designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS logic rails and stable operation under supply variation. |
| IOH / IOL | –32 mA / 64 mA - enables direct driving of heavy capacitive loads or multiple downstream inputs without buffering. |
| tPLH / tPHL | ≤ 3.6 ns (max) at CL = 50 pF - supports high-speed bus arbitration and real-time data handshaking in control systems. |
| θJA | 70°C/W (DB package) - defines thermal resistance for PCB-level thermal management in compact industrial enclosures. |
| Operating Temp | –40°C to +85°C - qualified for extended-temperature industrial environments including factory automation and motor drives. |
| Bus-Hold Current | ±100 µA at VI = 0.8 V or 2 V - actively sustains logic state on unused data lines, reducing BOM count and layout complexity. |
| Ioff | ±100 µA max at VCC = 0 - blocks damaging reverse current during hot-plug events, protecting upstream drivers and power rails. |
Pinout & Package
SN74ABTH245DBR uses a 20-pin Shrink Small-Outline Package (SSOP, DB), 7.4 mm × 5.3 mm footprint, 2.0 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Determines data flow direction: DIR = L → B-to-A; DIR = H → A-to-B; critical for half-duplex bus arbitration. |
| 2–9 (A1–A8) | Data Inputs/Outputs (A-side) | Bidirectional A-bus interface; bus-hold active when floating; driven by or drives external logic. |
| 10 (GND) | Ground Reference | Primary signal return path; must be low-inductance connection to minimize ground bounce (VOLP < 1 V). |
| 11 (VCC) | Power Supply | +5 V supply input; decoupling capacitor required near pin to suppress switching noise and ensure stable operation. |
| 12–19 (B1–B8) | Data Inputs/Outputs (B-side) | Bidirectional B-bus interface; electrically identical to A ports; supports independent voltage domain isolation. |
| 20 (OE) | Output Enable Input | Active-low control: OE = L enables transceiver; OE = H forces all A/B outputs into high-impedance state for bus isolation. |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS Process | Reduces dynamic power vs. standard bipolar while retaining high drive strength - critical for thermally constrained modules. |
| Hot-Insertion Support | Integrated Ioff and power-up 3-state eliminate need for external sequencing or isolation circuitry in modular backplanes. |
| Bus-Hold Circuitry | Eliminates external pull-up/pull-down resistors on all 16 data lines - reduces component count, board area, and EMI risk. |
| High-Drive Outputs | –32 mA IOH / 64 mA IOL supports fan-out to ≥10 LSTTL loads or long trace routing without signal degradation. |
| Low Ground Bounce | VOLP < 1 V at VCC = 5 V, TA = 25°C - minimizes logic errors caused by simultaneous output switching in dense layouts. |
Applications
| Industrial PLC Backplane Interface | Automated Test Equipment (ATE) Signal Routing |
|---|---|
|
Use Scenario: Bidirectional data exchange between CPU module and I/O expansion cards in a DIN-rail mounted PLC chassis. IC Role / Device Role / Timing Role: Bus transceiver enabling isolated, direction-controlled communication across hot-swappable slots with no bus contention. Use Value: Ioff and power-up 3-state prevent damage during card insertion/removal; bus-hold avoids floating inputs during configuration gaps. |
Use Scenario: Reconfigurable signal path switching between DUT interface and measurement instruments in rack-mounted ATE. IC Role / Device Role / Timing Role: High-speed bidirectional buffer managing multi-channel digital stimulus/response routing under microcontroller control. Use Value: 3.6 ns max propagation delay supports >100 MHz test pattern rates; ±64 mA drive handles long coaxial cable loads. |
| Motor Drive Controller Communication Hub | Legacy System Bus Bridge (TTL ↔ LVTTL) |
|
Use Scenario: Interfacing FPGA-based motion controller with legacy encoder feedback and analog I/O modules via shared parallel bus. IC Role / Device Role / Timing Role: Level-shifting, direction-managed transceiver isolating noisy motor power domains from sensitive logic domains. Use Value: 70°C/W θJA allows operation in sealed enclosures up to 85°C ambient; GND/VCC separation prevents ground loop coupling. |
Use Scenario: Bridging 5-V TTL control logic to newer 3.3-V LVTTL peripherals in retrofitted instrumentation systems. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional translator maintaining signal integrity across mixed-voltage subsystems. Use Value: 4.5–5.5 V VCC range ensures robust TTL compatibility; bus-hold stabilizes inputs during voltage transition periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Lower VCC range (1.65–3.6 V), CMOS-only process, lower drive (–24/+24 mA), no bus-hold or Ioff. | Suitable only for 3.3-V systems; requires external pull resistors; not rated for hot insertion. | Select when operating exclusively at 3.3 V and thermal/power constraints preclude BiCMOS solutions. |
| SN74AHCT245 | Same 5-V VCC range and pinout, but no bus-hold or Ioff; higher ICC (30 mA typical); TTL-compatible inputs only. | Lacks hot-swap safety and floating-input immunity; better suited for fixed-configuration boards with controlled power sequencing. | Choose for cost-sensitive 5-V designs where bus-hold and Ioff are non-critical and layout allows strict input biasing. |
Compared with SN74LVC245A and SN74AHCT245, the SN74ABTH245DBR uniquely combines 5-V operation, integrated bus-hold, Ioff-enabled hot insertion, and BiCMOS speed-power balance - making it the only option qualified for unattended industrial backplane upgrades and thermally dense control modules.
Availability
SN74ABTH245DBR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automated test equipment signal routing, motor drive controller communication hubs, and legacy system bus bridges requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABTH245DBR 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 ICs, with decades of heritage in industrial-grade interface solutions.
The ABTH logic family was engineered for high-reliability, high-drive 5-V bus interfacing in harsh environments - targeting factory automation, test instrumentation, and modular computing where signal integrity and hot-swap resilience are mandatory.
FAQ
What is the maximum output current capability of the SN74ABTH245DBR?
The SN74ABTH245DBR provides –32 mA high-level output current (IOH) and 64 mA low-level output current (IOL) under recommended operating conditions. These values enable direct driving of multiple LSTTL loads or capacitive traces without external buffers, and are validated per TI's SCBS663D datasheet at VCC = 4.5–5.5 V and TA = 25°C.
Does the SN74ABTH245DBR support hot insertion, and how is it implemented?
Yes, the SN74ABTH245DBR supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0 V to block reverse current, and power-up 3-state forces outputs into high-impedance during power ramp-up/down. Both mechanisms are specified in the absolute maximum ratings and recommended operating conditions sections of the SN74ABTH245DBR datasheet.
What package type and dimensions does the SN74ABTH245DBR use?
The SN74ABTH245DBR uses a 20-pin Shrink Small-Outline Package (SSOP, DB) measuring 7.4 mm × 5.3 mm with 0.65 mm lead pitch and 2.0 mm maximum height. Its JEDEC MO-150 registered outline, RoHS-compliant NiPdAu finish, and MSL Level-1 rating are documented in TI's DB0020A package drawing and packaging addendum.
How does bus-hold functionality work on the SN74ABTH245DBR, and what is its benefit?
The SN74ABTH245DBR integrates active bus-hold circuitry on all 16 data pins (A1–A8, B1–B8), providing ±100 µA holding current to maintain valid logic states on floating inputs. This eliminates the need for external pull-up or pull-down resistors, reducing BOM cost, PCB area, and potential EMI sources - confirmed in the electrical characteristics table of the SN74ABTH245DBR datasheet.
What is the thermal performance of the SN74ABTH245DBR in its DB package?
The SN74ABTH245DBR in the DB package has a junction-to-ambient thermal resistance (θJA) of 70°C/W, as specified in the absolute maximum ratings section of the SCBS663D datasheet. This value assumes standard JEDEC test board conditions and guides heatsinking requirements for continuous operation at full drive strength in industrial enclosures up to +85°C ambient.
SN74ABTH245DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABTH
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74ABTH245DBR FAQ
1.How can I place an order for SN74ABTH245DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABTH245DBR 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 SN74ABTH245DBR reliable?
The price and inventory of SN74ABTH245DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABTH245DBR is usually 5 days.
3.What payment methods are accepted for SN74ABTH245DBR?
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4.How is shipping managed for SN74ABTH245DBR?
SN74ABTH245DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABTH245DBR 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 SN74ABTH245DBR?
For technical support, including SN74ABTH245DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABTH245DBR requirements.
6.How does Aetrix verify that SN74ABTH245DBR is sourced from the original manufacturer or authorized distributors?
All SN74ABTH245DBR 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 SN74ABTH245DBR meets industry standards.
7.What is the process for return or replacement of SN74ABTH245DBR?
All SN74ABTH245DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABTH245DBR, 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 SN74ABTH245DBR part is unused and in its original packaging.
Return procedure for SN74ABTH245DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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