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Texas Instruments SN75453BD
- Part No.:
- SN75453BD
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN75453BD.pdf
- Description:
- IC PERIPHERAL DRIVER 5.25V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,594
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Product details
Overview
SN75453BD from Texas Instruments is a dual OR-gate peripheral driver IC designed for high-current, high-speed switching in TTL-based systems. It delivers 300 mA per channel, supports up to 30 V output voltage, operates from 0°C to 70°C, and features open-collector outputs with diode-clamped TTL-compatible inputs - used to drive lamps, LEDs, and line loads in industrial control interfaces.
For engineers reviewing the SN75453BD datasheet, SN75453BD pinout, SN75453BD application, or SN75453BD equivalent, this page provides verified functional identity, SOIC-8 package mapping, confirmed OR logic behavior, latch-up immunity at 20 V/300 mA, and real-world design values for supply current, propagation delay, and output saturation.
Technical Context
The SN75453BD implements two independent OR-gate logic drivers with internal npn transistor outputs, each configured as an open-collector stage. Its input structure includes diode clamping for robust TTL interfacing, and its output stage is rated for continuous 300 mA sink current with no latch-up up to 20 V.
It operates within a 4.75–5.25 V supply range and exhibits 18–25 ns typical propagation delay (low-to-high/high-to-low) at 5 V and 25°C. The device is functionally interchangeable with the legacy SN75450 family but adds guaranteed latch-up immunity and improved thermal stability in SOIC packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | OR gate per channel (positive logic: Y = A + B) |
| Max Output Current | 300 mA per channel - sufficient to directly drive lamps, relays, or LED strings without external buffering |
| Output Voltage Rating | 30 V off-state - enables direct interface with 24 V industrial buses and solenoid loads |
| Propagation Delay | 18–25 ns (tPLH/tPHL) - supports high-speed digital control up to ~20 MHz toggle rate |
| Supply Voltage Range | 4.75–5.25 V - compatible with standard 5 V TTL and CMOS logic rails |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control environments |
| Input Compatibility | TTL-level with diode clamping - eliminates need for external level-shifting or pull-up resistors |
Pinout & Package
SN75453BD is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.90 mm, with standard 1.27 mm lead pitch and surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A | Channel 1 & 2 Logic Input A | Digital input for first OR gate operand; TTL-compatible, diode-clamped |
| 1B, 2B | Channel 1 & 2 Logic Input B | Digital input for second OR gate operand; accepts 0.8 V low / 2.0 V high thresholds |
| 1Y, 2Y | Channel 1 & 2 Open-Collector Output | Sink-only output requiring external pull-up; drives loads to GND when active |
| GND | Ground Reference | Common return path for logic and output current; must be low-impedance |
| VCC | Positive Supply | 5 V power rail; requires 0.1 µF bypass capacitor adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| No latch-up at 20 V/300 mA | Guaranteed immunity to destructive latch-up under worst-case switching conditions |
| Open-collector outputs | Enables wired-OR bus configurations and flexible voltage translation via external pull-ups |
| Diode-clamped TTL inputs | Eliminates need for external clamping diodes or series resistors on logic inputs |
| High-speed switching | Sub-25 ns propagation ensures timing integrity in fast control loops and data strobes |
| Standard 5 V supply | Direct integration with legacy TTL, LSTTL, and 5 V microcontroller I/O without regulation |
Applications
| Industrial Lamp Control | LED Driver Interface |
|---|---|
Use Scenario: Driving 12–24 V incandescent or halogen indicator lamps in PLC I/O modules. IC Role / Device Role / Timing Role: Dual-channel OR driver providing isolated, current-sinking control of lamp anodes tied to positive rail. Use Value: Eliminates discrete transistor arrays; supports 300 mA per lamp with thermal margin at 70°C ambient. |
Use Scenario: Controlling high-brightness LED strings in signage or status panels using MCU GPIOs. IC Role / Device Role / Timing Role: Level-translating, current-boosting buffer between 3.3/5 V logic and common-anode LED loads. Use Value: Enables direct drive of 20–50 mA LEDs per channel without external transistors or current-limiting resistors on the MCU side. |
| Line Driver for Legacy Bus | Memory Address Decoder Buffer |
Use Scenario: Strengthening TTL-level address/data lines driving long PCB traces or backplane stubs. IC Role / Device Role / Timing Role: High-speed OR-gate buffer enhancing signal integrity and fan-out capability. Use Value: Maintains <25 ns edge fidelity across 15 pF loads, reducing setup/hold violations in parallel bus systems. |
Use Scenario: Enabling memory-mapped peripheral selection in 8-bit microcontroller systems with limited I/O drive strength. IC Role / Device Role / Timing Role: Dual OR gate generating chip-select signals from partial address decoding. Use Value: Provides noise-immune, latch-up-free enable logic with built-in input clamping - critical for reliable boot-time initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual OR-gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN75451BD | AND logic function instead of OR; identical pinout, package, and electrical specs | Requires inverted control logic to achieve same load activation behavior | Select when system architecture uses active-high enable with AND gating (e.g., safety interlock chains) |
| SN75452BD | NAND logic function; otherwise matches SN75453BD in speed, current, and package | Needs external inversion or logic reconfiguration to replicate OR functionality | Prefer where existing firmware or PCB layout already accommodates NAND-based enable schemes |
Compared with SN75451BD and SN75452BD, the SN75453BD provides native OR logic that simplifies active-high load control without additional gates or software inversion - reducing BOM count and timing path complexity in real-time I/O subsystems.
Availability
SN75453BD is available at Aetrix Electronics and suitable for industrial lamp control, LED driver interfaces, legacy bus line driving, and memory address decoder buffering requiring stable component supply and long-term production continuity.
Supply support for SN75453BD 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 for industrial, automotive, and communications markets.
The SN7545xB family was engineered to replace legacy SN75450-series drivers with enhanced latch-up immunity and consistent high-current switching performance across commercial temperature ranges.
FAQ
What logic function does the SN75453BD implement?
The SN75453BD implements two independent OR gates (positive logic: Y = A + B) with open-collector outputs. Each channel activates its output (pulls low) when either input A or B is high. This behavior is confirmed in the device function table and logic diagrams in the TI datasheet SLRS021E, and distinguishes SN75453BD from SN75451BD (AND) and SN75452BD (NAND).
Can SN75453BD drive a 24 V relay coil directly?
Yes - the SN75453BD supports up to 30 V off-state output voltage and 300 mA continuous sink current per channel, making it suitable for direct drive of typical 24 V DC relay coils drawing ≤250 mA. Ensure the relay coil is connected between VCC (24 V) and the SN75453BD output pin, with GND completing the path, and verify coil inductance does not exceed flyback protection limits.
Is SN75453BD pin-compatible with SN75451BD?
Yes - SN75453BD and SN75451BD share identical SOIC-8 pinout, package dimensions, and terminal functions (1A, 1B, 1Y, GND, VCC, 2B, 2A, 2Y). The only functional difference is internal logic: OR vs. AND. This allows drop-in replacement in layouts where logic inversion is handled at the system level.
What is the maximum recommended load current for SN75453BD?
The absolute maximum continuous collector current for SN75453BD is 400 mA, but the characterized specification is 300 mA per channel under recommended operating conditions. For reliable operation at 70°C ambient, TI specifies 300 mA as the maximum sustained current - exceeding this risks thermal overload and reduced lifetime, especially without adequate PCB copper area for heat dissipation.
Does SN75453BD require external pull-up resistors on its outputs?
Yes - because SN75453BD features open-collector outputs, external pull-up resistors are mandatory to establish a defined high state. Typical values range from 1 kΩ to 10 kΩ depending on load voltage (e.g., 4.7 kΩ for 5 V, 10 kΩ for 24 V), selected to limit current while ensuring rise time meets system timing requirements.
SN75453BD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Peripheral Driver
- Number of Elements:
- 2
- Number of Bits per Element:
- 2
- Input Type:
- -
- Output Type:
- Open Collector
- Current - Output High, Low:
- 100µA, 300mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SN75453BD FAQ
1.How can I place an order for SN75453BD through Aetrix?
Please submit a Request for Quotation (RFQ) for SN75453BD 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 SN75453BD reliable?
The price and inventory of SN75453BD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN75453BD is usually 5 days.
3.What payment methods are accepted for SN75453BD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN75453BD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN75453BD?
SN75453BD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN75453BD 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 SN75453BD?
For technical support, including SN75453BD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN75453BD requirements.
6.How does Aetrix verify that SN75453BD is sourced from the original manufacturer or authorized distributors?
All SN75453BD 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 SN75453BD meets industry standards.
7.What is the process for return or replacement of SN75453BD?
All SN75453BD units undergo pre-shipment inspection (PSI). If there is an issue with SN75453BD, 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 SN75453BD part is unused and in its original packaging.
Return procedure for SN75453BD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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