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Texas Instruments SN75451BPSR
- Part No.:
- SN75451BPSR
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN75451BPSR.pdf
- Description:
- IC PERIPHERAL DRIVER 5.25V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:790
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Product details
Overview
SN75451BPSR 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 up to 300 mA per channel, supports output voltages up to 30 V, features open-collector outputs with diode-clamped TTL inputs, and operates across 0°C to 70°C. It is commonly used to interface microcontrollers with high-voltage lamps or LEDs.
For engineers reviewing the SN75451BPSR datasheet, SN75451BPSR pinout, SN75451BPSR application, or SN75451BPSR equivalent, key selection criteria include its AND-logic function, 300 mA continuous output current rating, 30 V off-state output voltage tolerance, SO (PS) 8-pin package, and commercial temperature range suitability for industrial control and display driver designs.
Technical Context
The SN75451BPSR integrates two independent AND-gate logic inputs driving NPN open-collector output transistors. Each channel's output turns on (low) only when both inputs A and B are high - enabling precise enable-controlled switching of external loads. Its internal resistor network (e.g., 1.6 kΩ base resistors) ensures stable transistor biasing without external components.
Designed as a direct functional replacement for the SN75450 family, it eliminates latch-up risk at 20 V after conducting 300 mA and maintains compatibility with standard 5 V TTL logic levels. The device uses diode-clamped inputs to suppress negative transients and simplify interface design with legacy logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | AND gate per channel - both inputs must be high to pull output low; enables synchronous load activation. |
| Max Output Current | 300 mA continuous per channel - sufficient to drive lamps, relays, or LED arrays without external buffers. |
| Output Voltage Rating | 30 V off-state - supports direct connection to 24 V industrial supplies or lamp strings without level-shifting. |
| Input Compatibility | TTL-compatible with diode-clamped inputs - accepts standard 0.8 V / 2.0 V logic thresholds and withstands input overvoltage. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems, consumer electronics, and office equipment. |
| Propagation Delay | 18–25 ns (low-to-high) at 5 V - enables high-speed digital interfacing with MCUs and FPGAs in real-time control loops. |
| Supply Voltage | 4.75 V to 5.25 V - tightly regulated 5 V rail required; bypass capacitor (0.1 µF) mandatory at VCC pin. |
Pinout & Package
SN75451BPSR is housed in an 8-pin SO (PS) surface-mount package measuring 6.20 mm × 5.30 mm, with gull-wing leads and RoHS-compliant NiPdAu finish. It is rated for moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A | Channel 1 Logic Input A | First AND-gate input; must be driven high (≥2.0 V) with defined logic state - floating inputs cause undefined output. |
| 1B | Channel 1 Logic Input B | Second AND-gate input; both 1A and 1B high required to activate Channel 1 output (1Y). |
| 1Y | Channel 1 Open-Collector Output | Sinks up to 300 mA to GND when enabled; requires external pull-up to load supply (e.g., 24 V). |
| GND | Ground Reference | Common return path for logic inputs, supply, and output current; must be low-impedance for noise immunity. |
| VCC | Positive Supply | 5 V ±2.5% power rail; bypassed with 0.1 µF ceramic capacitor placed adjacent to pin. |
| 2A | Channel 2 Logic Input A | Independent AND-gate input for second channel; electrically isolated from Channel 1. |
| 2B | Channel 2 Logic Input B | Second input for Channel 2; both 2A and 2B high required to activate 2Y. |
| 2Y | Channel 2 Open-Collector Output | Functionally identical to 1Y; enables dual-load control (e.g., LED + relay) from one IC. |
Key Features
| Feature | Design Value |
|---|---|
| No latch-up at 20 V | Guaranteed immunity to destructive latch-up even after sustained 300 mA conduction - eliminates need for external current limiting during fault conditions. |
| Diode-clamped TTL inputs | Integrated input protection diodes allow safe operation with negative transients and simplify PCB layout by removing external clamping components. |
| Open-collector outputs | Enable flexible voltage translation: outputs can switch loads referenced to higher voltages (e.g., 24 V) while logic remains at 5 V. |
| High-speed switching | Sub-25 ns propagation delay supports >20 MHz toggle rates - suitable for pulse-width modulation (PWM) dimming and fast logic buffering. |
| Standard 5 V supply | Operates within tight 4.75–5.25 V window - compatible with common LDO regulators and avoids brown-out risks in noisy power environments. |
Applications
| Industrial Lamp Control | LED Display Driver |
|---|---|
|
Use Scenario: Driving 24 V incandescent or halogen indicator lamps in PLC I/O modules or panel meters. IC Role / Device Role / Timing Role: Dual-channel AND gate acts as enable-controlled current sink - each lamp activates only when both MCU GPIOs assert high. Use Value: Eliminates discrete transistor arrays; 300 mA per channel handles typical 2–5 W lamps directly without heatsinking. |
Use Scenario: Controlling segments of multiplexed 7-segment LED displays in test equipment or instrumentation. IC Role / Device Role / Timing Role: Sinks segment current while MCU sources digit select lines - leverages open-collector topology for common-anode architecture. Use Value: 25 ns propagation delay ensures clean digit/segment timing alignment; TTL compatibility simplifies firmware-level logic mapping. |
| Relay Interface Circuit | Logic-Level Translator |
|
Use Scenario: Activating 12 V or 24 V electromagnetic relays in HVAC controllers or power distribution units. IC Role / Device Role / Timing Role: Provides galvanically isolated switching interface between 5 V MCU outputs and relay coils - no optocoupler needed. Use Value: 30 V output rating exceeds relay coil flyback voltage; built-in input clamping protects against inductive kickback coupling. |
Use Scenario: Converting 3.3 V logic signals to drive 5 V TTL peripherals in mixed-voltage systems. IC Role / Device Role / Timing Role: Functions as unidirectional level shifter using open-collector output pulled to 5 V - preserves AND logic functionality across voltage domains. Use Value: Diode-clamped inputs tolerate 3.3 V logic safely; propagation delay adds negligible skew in synchronous data paths. |
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 (D) 8-pin package (4.90 mm × 3.90 mm); slightly smaller footprint and different thermal resistance (RθJA = 122.2°C/W vs. 119.6°C/W). | Preferred where board space is constrained and SOIC reflow profile is standardized; not drop-in compatible due to different body size and lead pitch. | Select SN75451BD if SOIC-8 is already used in your assembly process and thermal margin allows for marginally higher junction temperature rise. |
| SN75451BP | Identical functionality in PDIP (P) 8-pin through-hole package (9.81 mm × 6.35 mm); higher RθJA (63.7°C/W) but easier prototyping and manual soldering. | Used in lab prototypes, educational kits, or legacy through-hole production; incompatible with SMT-only lines. | Choose SN75451BP for breadboarding, quick-turn validation, or mixed-technology boards where hand-soldering is acceptable. |
Compared with SN75451BD and SN75451BP, SN75451BPSR offers the largest SO package (PS) with optimized thermal performance for volume SMT manufacturing, making it ideal for cost-sensitive industrial products requiring reliable 300 mA switching in compact layouts.
Availability
SN75451BPSR is available at Aetrix Electronics and suitable for industrial lamp control, LED display drivers, relay interface circuits, and logic-level translator applications requiring stable component supply and long-term manufacturability.
Supply support for SN75451BPSR 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 connectivity technologies, with decades of heritage in precision logic and interface solutions.
SN75451BPSR belongs to TI's legacy dual-peripheral driver product line, engineered specifically for robust, high-current interfacing between TTL logic and industrial loads - emphasizing latch-up immunity, wide output voltage tolerance, and simplified system integration.
FAQ
What logic function does the SN75451BPSR implement?
The SN75451BPSR implements a dual-channel AND gate: each output (1Y and 2Y) goes low only when both corresponding inputs (1A/1B and 2A/2B) are high. This enables synchronized load activation - for example, a lamp illuminates only when both "enable" and "on" signals are asserted. Its truth table matches positive-logic AND behavior, and it is not a buffer or inverter.
Can SN75451BPSR drive a 24 V relay coil directly?
Yes, SN75451BPSR can drive a 24 V relay coil directly via its open-collector output. With a 24 V pull-up on 1Y or 2Y, the IC sinks up to 300 mA when enabled - sufficient for most signal- and control-class relays (e.g., 24 V, 100–200 Ω coils). Ensure the relay's flyback diode is installed across the coil to protect the SN75451BPSR output transistor.
Is SN75451BPSR pin-compatible with SN75451BD or SN75451BP?
No, SN75451BPSR is not pin-compatible with SN75451BD or SN75451BP. While all three share identical pin functions (1A, 1B, 1Y, GND, VCC, 2B, 2A, 2Y), they use different packages: SN75451BPSR is SO (PS), SN75451BD is SOIC (D), and SN75451BP is PDIP (P). Their footprints, dimensions, and lead pitches differ - requiring separate PCB layouts for each variant.
What is the maximum continuous current per channel for SN75451BPSR?
The maximum continuous output current per channel for SN75451BPSR is 300 mA, as specified under Recommended Operating Conditions and confirmed in Absolute Maximum Ratings. Exceeding this value risks thermal overload or premature failure. Derating is required above 25°C ambient - consult the dissipation ratings table for power limits at elevated temperatures.
Does SN75451BPSR require external base resistors for its output transistors?
No, SN75451BPSR does not require external base resistors. Its internal schematic includes integrated base-emitter resistors (e.g., 1.6 kΩ) that properly bias the NPN output transistors. Adding external resistors would disrupt the designed current gain and switching characteristics - TI's reference designs and layout guidelines specify direct connection of loads to 1Y/2Y with appropriate pull-ups.
SN75451BPSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
SN75451BPSR FAQ
1.How can I place an order for SN75451BPSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN75451BPSR 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 SN75451BPSR reliable?
The price and inventory of SN75451BPSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN75451BPSR is usually 5 days.
3.What payment methods are accepted for SN75451BPSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN75451BPSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN75451BPSR?
SN75451BPSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN75451BPSR 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 SN75451BPSR?
For technical support, including SN75451BPSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN75451BPSR requirements.
6.How does Aetrix verify that SN75451BPSR is sourced from the original manufacturer or authorized distributors?
All SN75451BPSR 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 SN75451BPSR meets industry standards.
7.What is the process for return or replacement of SN75451BPSR?
All SN75451BPSR units undergo pre-shipment inspection (PSI). If there is an issue with SN75451BPSR, 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 SN75451BPSR part is unused and in its original packaging.
Return procedure for SN75451BPSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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