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Texas Instruments SN75451BPS
- Part No.:
- SN75451BPS
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN75451BPS.pdf
- Description:
- IC PERIPHERAL DRIVER 5.25V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:885
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Product details
Overview
SN75451BPS from Texas Instruments is a dual-channel AND-gate peripheral driver IC designed for high-current, high-speed switching in TTL-compatible logic systems. It delivers 300 mA per channel, supports up to 30 V output voltage, features open-collector outputs with diode-clamped TTL inputs, and operates across 0°C to 70°C - commonly used to interface microcontrollers with lamps, LEDs, or relay loads.
For engineers reviewing the SN75451BPS datasheet, SN75451BPS pinout, SN75451BPS application, or SN75451BPS equivalent, key selection criteria include its AND-logic-driven npn output stage, latch-up immunity at 20 V/300 mA, thermal performance in SO package (RθJA = 119.6°C/W), and compatibility with 5 V logic supply rails.
Technical Context
The SN75451BPS implements two independent AND-gate logic stages whose outputs drive internal npn transistors with base resistors (500 Ω, 1 kΩ, 4 kΩ) and emitter termination (130 Ω). Each channel functions as a current-sinking driver: output Y turns ON (low) only when both inputs A and B are high, enabling precise control of external loads grounded through the collector.
It operates strictly within 4.75 V–5.25 V VCC range and requires no external biasing; inputs tolerate standard TTL voltage thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V), while outputs withstand up to 30 V off-state voltage and deliver VOL ≤ 0.4 V at 300 mA load - critical for driving inductive or resistive peripherals without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - ensures stable operation with standard 5 V logic supplies and rejects noise-induced false triggering. |
| Output Current | 300 mA per channel - sufficient to directly drive lamps, relays, or LED strings without external transistor staging. |
| Output Voltage Rating | 30 V max off-state - enables direct connection to 24 V industrial buses or solenoid drivers without external flyback protection. |
| Propagation Delay | 18 ns to 25 ns (tPLH/tPHL) - supports high-speed digital interfacing up to ~20 MHz clock-equivalent edge rates. |
| Logic Function | AND gate per channel (Y = A·B) - provides active-low enable control ideal for safety-critical or interlocked peripheral activation. |
| Thermal Resistance | RθJA = 119.6°C/W (SO package) - defines maximum power dissipation (≤464 mW at 70°C ambient) for board-level thermal design. |
| Input Compatibility | TTL diode-clamped inputs - eliminates need for external pull-ups or clamping diodes when driven by standard 5 V logic. |
Pinout & Package
SN75451BPS uses an 8-pin small-outline (SO) package measuring 6.20 mm × 5.30 mm, with gull-wing leads and RoHS-compliant NiPdAu plating. Thermal performance is characterized per JEDEC standards with RθJA = 119.6°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 1B | Channel 1 logic inputs | Accept TTL-level signals; both must be HIGH to activate Channel 1 output (1Y). |
| 1Y | Channel 1 open-collector output | Sinks up to 300 mA to GND; requires external pull-up to VSUP for active-high load control. |
| GND | Ground reference | Common return path for logic inputs, supply, and output current; must be low-impedance for latch-up immunity. |
| VCC | Positive supply | 5 V nominal supply powering internal logic and base drive; bypass with 0.1 µF capacitor near pin. |
| 2A, 2B | Channel 2 logic inputs | Independent AND-gate inputs mirroring Channel 1 functionality for dual-load control. |
| 2Y | Channel 2 open-collector output | Functionally identical to 1Y; enables simultaneous or coordinated control of two separate peripherals. |
Key Features
| Feature | Design Value |
|---|---|
| No latch-up at 20 V / 300 mA | Guarantees robust operation under transient overvoltage and overload conditions without destructive failure. |
| Diode-clamped TTL inputs | Eliminates external input protection components and ensures reliable logic-level recognition across temperature. |
| Open-collector outputs | Enables wired-OR configurations, level translation to higher VSUP rails, and flexible load grounding schemes. |
| Characterized for 0°C to 70°C | Validated performance across commercial temperature range - suitable for office, consumer, and light-industrial environments. |
| High-speed switching (≤25 ns) | Supports fast peripheral enable/disable cycles, reducing system response latency in real-time control applications. |
Applications
| Lamp Driver | LED Driver |
|---|---|
Use Scenario: Driving incandescent or halogen indicator lamps in industrial HMIs or test equipment. IC Role / Device Role / Timing Role: Acts as current-sinking switch controlled by MCU GPIOs via AND logic - lamp illuminates only when both enable signals are asserted. Use Value: Eliminates discrete transistor + resistor networks; leverages 30 V output rating to drive 24 V lamps directly without external voltage translation. | Use Scenario: Controlling high-brightness LED arrays in signage or backlighting systems. IC Role / Device Role / Timing Role: Provides synchronized, logic-gated current sink for multiple LED strings, with fast turn-on/off enabling PWM dimming. Use Value: 300 mA per channel supports multi-LED series strings; low VOL (≤0.4 V) minimizes power loss and thermal rise in the driver. |
| Relay Driver | Line Driver |
Use Scenario: Activating electromagnetic relays in PLC I/O modules or power distribution units. IC Role / Device Role / Timing Role: Sinks relay coil current (typically 20–100 mA) with built-in base drive - AND logic prevents accidental activation during reset or noise events. Use Value: Integrated base resistors and latch-up immunity ensure long-term reliability in electrically noisy industrial environments. | Use Scenario: Driving long PCB traces or cables carrying TTL-level signals to remote subsystems. IC Role / Device Role / Timing Role: Buffers and amplifies logic signals to maintain edge integrity over capacitive loads up to 15 pF. Use Value: 25 ns propagation delay preserves signal timing margins; open-collector output allows bus termination and voltage-level adaptation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual AND-driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN75451BD | Same logic function and electrical specs, but in SOIC-8 (4.90 mm × 3.90 mm) package with lower RθJA (122.2°C/W). | Preferred for space-constrained layouts where smaller footprint is critical; thermal performance differs slightly due to package geometry. | Select SN75451BD if board area is limited and thermal margin allows for higher junction temperature rise. |
| SN75452BPS | NAND logic function instead of AND; otherwise identical pinout, package, and drive capability (300 mA, 30 V). | Used where active-low enable or inverted control logic is required - e.g., fail-safe shutdown paths or complementary signal generation. | Choose SN75452BPS only when NAND truth table (Y = NOT(A·B)) matches system control architecture. |
Compared with SN75451BD and SN75452BPS, SN75451BPS offers identical AND functionality in a wider SO package (6.20 mm × 5.30 mm) with moderate thermal resistance - making it optimal for cost-sensitive, thermally relaxed designs requiring proven reliability and legacy footprint compatibility.
Availability
SN75451BPS is available at Aetrix Electronics and suitable for lamp drivers, LED arrays, and relay interfaces requiring stable component supply, long-lifecycle support, and commercial-temperature-grade reliability.
Supply support for SN75451BPS 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The SN7545xB family was designed specifically for TTL-based peripheral interfacing - providing robust, latch-up-free, high-current driver capability in standardized packages to simplify legacy system upgrades and reduce bill-of-materials complexity.
FAQ
What logic function does the SN75451BPS implement?
The SN75451BPS implements a dual AND-gate logic function: each channel's output (1Y or 2Y) goes low (active) only when both corresponding inputs (1A and 1B, or 2A and 2B) are high. This behavior is confirmed in the device function table and schematic diagrams in the official Texas Instruments datasheet for SN75451BPS, and applies identically across all temperature and supply conditions within specification.
Can SN75451BPS drive a 24 V relay coil directly?
Yes, SN75451BPS can drive a 24 V relay coil directly using its open-collector output configuration. The output withstands up to 30 V off-state voltage, and typical relay coils draw <100 mA - well within the 300 mA per-channel continuous rating of SN75451BPS. A flyback diode must be placed externally across the coil to suppress inductive kickback, as SN75451BPS does not integrate clamp diodes on the outputs.
What is the maximum operating temperature for SN75451BPS?
The SN75451BPS is characterized for operation from 0°C to 70°C ambient temperature, as specified in the Recommended Operating Conditions section of the Texas Instruments datasheet. This commercial-grade temperature range is distinct from the military-grade SN55451B variant (–55°C to 125°C) and must be respected to ensure guaranteed electrical performance and reliability of SN75451BPS.
Does SN75451BPS require external base resistors for its output transistors?
No, SN75451BPS does not require external base resistors. Its internal schematic integrates fixed-value base drive resistors (500 Ω, 1 kΩ, and 4 kΩ) and emitter termination (130 Ω) for each npn output transistor - fully optimizing current gain and saturation characteristics for 300 mA loads. This eliminates external component count and ensures consistent turn-on behavior across process and temperature variations in SN75451BPS.
Is SN75451BPS pin-compatible with SN75451BD or SN75451BP?
Yes, SN75451BPS is pin-compatible with SN75451BD (SOIC-8) and SN75451BP (PDIP-8): all share identical 8-pin dual-in-line pinout (1A, 1B, 1Y, GND, VCC, 2B, 2A, 2Y), same logic function, and matching DC/AC electrical specifications. Differences lie only in package dimensions, thermal resistance, and moisture sensitivity level - allowing direct substitution in existing layouts where mechanical fit permits.
SN75451BPS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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-SO
SN75451BPS FAQ
1.How can I place an order for SN75451BPS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN75451BPS 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 SN75451BPS reliable?
The price and inventory of SN75451BPS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN75451BPS is usually 5 days.
3.What payment methods are accepted for SN75451BPS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN75451BPS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN75451BPS?
SN75451BPS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN75451BPS 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 SN75451BPS?
For technical support, including SN75451BPS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN75451BPS requirements.
6.How does Aetrix verify that SN75451BPS is sourced from the original manufacturer or authorized distributors?
All SN75451BPS 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 SN75451BPS meets industry standards.
7.What is the process for return or replacement of SN75451BPS?
All SN75451BPS units undergo pre-shipment inspection (PSI). If there is an issue with SN75451BPS, 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 SN75451BPS part is unused and in its original packaging.
Return procedure for SN75451BPS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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