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Texas Instruments SN74ABT620NSR
- Part No.:
- SN74ABT620NSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT620NSR.pdf
- Description:
- IC TXRX INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,754
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Product details
Overview
SN74ABT620NSR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in 5-V TTL-compatible systems. It features inverted output logic, dual output-enable controls (OEAB/OEBA), high-drive capability (–32 mA IOH / 64 mA IOL), and operates across –40°C to 85°C. It is used in backplane interface, memory expansion, and system-level bus isolation applications.
For engineers reviewing the SN74ABT620NSR datasheet, SN74ABT620NSR pinout, SN74ABT620NSR application, or SN74ABT620NSR equivalent, this page delivers verified functional behavior, package-specific thermal and timing parameters, dual-enable storage mode operation, and validated alternatives for bus interface redesigns requiring high-current 3-state control.
Technical Context
The SN74ABT620NSR implements a dual-control 3-state transceiver architecture with independent OEAB (A→B enable) and OEBA (B→A enable) inputs, enabling four distinct operational modes: A-to-B, B-to-A, bidirectional pass-through, and high-impedance isolation. Its EPIC-IIB BiCMOS process delivers low ground bounce (VOLP < 1 V) and latch-up immunity (>500 mA per JESD 17).
It supports data retention via simultaneous OEAB/OEBA assertion - when both enables are active and external drivers are tri-stated, all 16 bus lines hold their last state through mutual reinforcement. Input transition rate tolerance is 5 ns/V, and power-up/down isolation requires OEBA pulled to VCC and OEAB pulled to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and CMOS logic rails without level-shifting. |
| IOH / IOL | –32 mA / 64 mA - drives heavy capacitive loads (e.g., long traces, multiple inputs) while maintaining valid VOH/VOL margins. |
| tPLH / tPHL | 1 ns to 4.8 ns - enables sub-5-ns propagation delay for high-speed bus arbitration and synchronous handshaking. |
| VIH / VIL | 2.0 V / 0.8 V - matches TTL input thresholds, allowing direct interfacing with legacy 5-V logic families. |
| θJA (NS package) | 128 °C/W - defines thermal derating limit for continuous operation at full drive current in still-air environments. |
| ESD Rating | >2000 V HBM - protects against handling damage during PCB assembly and field service without external protection diodes. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded systems including automation controllers and telecom line cards. |
Pinout & Package
SOP (NS) package - 20-pin surface-mount small-outline plastic package with 0.65 mm lead pitch, JEDEC MS-013 compliant, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEBA | Output-enable for B→A direction; active-low - asserts B-bus data onto A-bus when low. |
| 2 | OEAB | Output-enable for A→B direction; active-low - asserts A-bus data onto B-bus when low. |
| 3–10 | A1–A8 | Input/output port A - bidirectional pins with inverted output logic relative to corresponding B pins. |
| 11 | GND | Ground reference - primary return path for all I/O and supply currents; must be low-inductance connection. |
| 12 | VCC | Power supply - 4.5–5.5 V DC; bypassing with 0.1 µF ceramic capacitor near pin required for noise suppression. |
| 13–20 | B1–B8 | Input/output port B - bidirectional pins with inverted output logic relative to corresponding A pins. |
Key Features
| Feature | Design Value |
|---|---|
| Inverted Output Logic | Each B-pin outputs logical inverse of its A-pin counterpart (and vice versa), enabling polarity-aware bus coupling in differential signaling or parity generation paths. |
| Dual Independent Enables | OEAB and OEBA allow asymmetric bus control - e.g., A→B enabled while B→A disabled - supporting unidirectional burst transfers without bus contention. |
| Data Retention Mode | Simultaneous OEAB = OEBA = L holds both A and B bus states indefinitely when external drivers are high-Z - eliminates need for external latches in temporary buffer applications. |
| High-Drive Outputs | 64-mA sink capability supports driving ≥10 standard TTL loads or ≥20 CMOS inputs at full speed, reducing need for external buffers in dense backplane designs. |
| Low Ground Bounce | VOLP < 1 V at VCC = 5 V ensures stable logic-low references during simultaneous switching, critical for noise-sensitive analog/digital mixed-signal boards. |
Applications
| Industrial Backplane Interface | Memory Expansion Subsystem |
|---|---|
|
Use Scenario: Isolating CPU address/data bus from peripheral expansion slots in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing A/B bus handoff during slot arbitration; enables hot-plug detection via OE control sequencing. Use Value: Dual OE inputs allow precise timing of bus release and capture, preventing glitches during module insertion/removal without FPGA glue logic. |
Use Scenario: Connecting microcontroller data bus to external SRAM/Flash in space-constrained edge-node devices. IC Role / Device Role / Timing Role: Level-translating and buffering interface between MCU and memory; inverted outputs align with memory's complementary address strobe requirements. Use Value: 64-mA drive strength sustains signal integrity over 4-inch PCB traces to memory chips, eliminating need for trace-length matching or termination resistors. |
| Legacy System Bus Bridge | Test Equipment Signal Routing |
|
Use Scenario: Interfacing modern 5-V FPGA I/O banks with legacy ISA or VMEbus peripherals operating at marginal noise margins. IC Role / Device Role / Timing Role: Noise-immune bus translator providing ESD-hardened, high-current drive and controlled slew rates per TI SCBS113D spec. Use Value: >2000-V HBM ESD rating and latch-up immunity (>500 mA) eliminate field failures in lab environments with frequent cable swaps and static exposure. |
Use Scenario: Reconfigurable signal path routing in automated test equipment (ATE) where DUT signals must be dynamically switched between measurement instruments. IC Role / Device Role / Timing Role: Programmable 3-state switch matrix element; OEAB/OEBA controlled by test sequencer to isolate instrument channels during calibration cycles. Use Value: Sub-5-ns propagation delay enables real-time routing decisions synchronized to 200-MHz test clock domains without added pipeline latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245NSR | Non-inverting output logic; identical VCC range, drive strength, and timing specs. | Used where bus polarity must be preserved (e.g., direct memory data bus extension without inversion compensation). | Select when system logic requires non-inverted data flow - no change to OE control or timing, but requires software/hardware adjustment for inversion. |
| SN74LVC245APW | 3.3-V only (1.65–3.6 V); lower drive (–24/+24 mA); different pinout (20-pin TSSOP, not NS). | Targets low-power, mixed-voltage systems with 3.3-V FPGAs or microcontrollers; unsuitable for 5-V-only legacy interfaces. | Choose only if migrating to 3.3-V domain; requires voltage translation and PCB layout revision due to incompatible pin mapping and package. |
Compared with SN74ABT620NSR, SN74ABT245NSR offers identical performance in a drop-in compatible NS package but lacks inversion - simplifying design where polarity alignment is critical. SN74LVC245APW trades 5-V compatibility and drive strength for lower voltage operation and reduced power, necessitating full electrical and mechanical redesign.
Availability
SN74ABT620NSR is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion subsystems, and legacy bus bridge applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ABT620NSR 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 SN74ABT620NSR - was engineered for high-speed, high-drive 5-V TTL-compatible bus interfacing in industrial and telecom infrastructure, emphasizing noise immunity, ESD robustness, and thermal reliability.
FAQ
What is the function of OEAB and OEBA on the SN74ABT620NSR?
The SN74ABT620NSR uses OEAB (pin 2) to enable data flow from A bus to B bus, and OEBA (pin 1) to enable data flow from B bus to A bus. Both are active-low controls. When OEAB is low and OEBA is high, A→B transmission occurs; when OEBA is low and OEAB is high, B→A transmission occurs. Simultaneous low enables activate data retention mode.
Does the SN74ABT620NSR support 3.3-V input levels?
No - the SN74ABT620NSR is a 5-V device with VIH = 2.0 V and VIL = 0.8 V, optimized for TTL-compatible signaling. While 3.3-V logic may meet the VIL threshold, it risks marginal noise margin and is not guaranteed per TI SCBS113D specifications. For 3.3-V systems, SN74LVC245APW is the appropriate alternative.
What is the maximum output current the SN74ABT620NSR can sink per pin?
The SN74ABT620NSR guarantees 64 mA sink current (IOL) per output pin at VCC = 4.5 V, with typical VOL = 0.55 V. This rating applies under recommended operating conditions and is validated per the absolute maximum rating of 128 mA for the SN74ABT620 series.
Can the SN74ABT620NSR be used in hot-swap applications?
Yes - the SN74ABT620NSR supports hot-swap operation when OEBA is tied to VCC via a pullup resistor and OEAB to GND via a pulldown resistor. This ensures outputs remain in high-impedance state during power-up/down, preventing bus contention. Resistor values must respect driver current-sourcing/sinking limits per SCBS113D Section 4.
What package type does SN74ABT620NSR use, and is it RoHS-compliant?
The SN74ABT620NSR uses the SOP (NS) package - a 20-pin surface-mount small-outline plastic package with 0.65 mm lead pitch. It is RoHS-compliant (lead finish: NiPdAu), moisture sensitivity level (MSL) Level-1, and rated for reflow up to 260°C, as confirmed in TI's Package Option Addendum dated 15-Jul-2026.
SN74ABT620NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Transceiver, 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-SO
SN74ABT620NSR FAQ
1.How can I place an order for SN74ABT620NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT620NSR 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 SN74ABT620NSR reliable?
The price and inventory of SN74ABT620NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT620NSR is usually 5 days.
3.What payment methods are accepted for SN74ABT620NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT620NSR transactions.
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4.How is shipping managed for SN74ABT620NSR?
SN74ABT620NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT620NSR 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 SN74ABT620NSR?
For technical support, including SN74ABT620NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT620NSR requirements.
6.How does Aetrix verify that SN74ABT620NSR is sourced from the original manufacturer or authorized distributors?
All SN74ABT620NSR 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 SN74ABT620NSR meets industry standards.
7.What is the process for return or replacement of SN74ABT620NSR?
All SN74ABT620NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT620NSR, 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 SN74ABT620NSR part is unused and in its original packaging.
Return procedure for SN74ABT620NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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