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Texas Instruments SN75451BDRE4
- Part No.:
- SN75451BDRE4
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN75451BDRE4.pdf
- Description:
- IC PERIPHERAL DRIVER 5.25V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,167
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Product details
Overview
SN75451BDRE4 from Texas Instruments is a dual-peripheral AND driver IC designed for high-current, high-speed switching in TTL-based systems. It delivers 300mA per channel, supports up to 30V output voltage, features open-collector outputs with diode-clamped TTL-compatible inputs, and operates across 0°C to 70°C - commonly used to interface microcontrollers with lamps, LEDs, or relay loads.
For engineers reviewing the SN75451BDRE4 datasheet, SN75451BDRE4 pinout, SN75451BDRE4 application, or SN75451BDRE4 equivalent, key selection criteria include its AND logic function, SOIC-8 package thermal performance (RθJA = 122.2°C/W), latch-up immunity at 20V/300mA, and compatibility with 5V logic supply rails.
Technical Context
The SN75451BDRE4 integrates two independent AND-gated npn transistor drivers, each with internally connected logic gates driving base-emitter junctions. Its diode-clamped inputs eliminate external protection components, while open-collector outputs allow wired-OR configurations and flexible pull-up voltage selection up to 30V.
It operates strictly within 4.75V–5.25V VCC range at commercial temperature (0°C to 70°C), exhibits propagation delays of 18–25ns (tPLH/tPHL) at 5V/25°C, and maintains low saturation voltage (VOL ≤ 0.4V at 300mA) - enabling efficient drive into resistive or inductive loads without external flyback protection in many cases.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - ensures stable operation with standard 5V TTL/CMOS logic supplies |
| Output Current | 300 mA per channel - sufficient to directly drive LEDs, relays, or small solenoids without external buffers |
| Max Output Voltage | 30 V - supports high-voltage peripherals like 24V industrial lamps or legacy bus lines |
| Logic Function | AND gate per channel - output active only when both inputs are high, enabling enable-controlled drive |
| Propagation Delay | 18 ns (min), 25 ns (typ) - enables reliable timing in high-speed digital control loops up to ~20 MHz |
| Input Clamp Voltage | –1.2 V to –1.5 V - protects inputs from negative transients during hot-swap or inductive kickback |
| Thermal Resistance | RθJA = 122.2 °C/W (SOIC-8) - defines maximum power dissipation (725 mW at 25°C ambient) before thermal shutdown |
Pinout & Package
SN75451BDRE4 uses an 8-pin SOIC (D) package measuring 4.90 mm × 3.90 mm with standard 1.27 mm lead pitch. The device has no internal connections on pins other than those defined in the functional pin table below.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A | Channel 1 Logic Input A | TTL-compatible input; must be driven to ≥2 V (VIH) or ≤0.8 V (VIL) - floating inputs cause undefined output state |
| 1B | Channel 1 Logic Input B | Second AND input for Channel 1; both 1A and 1B must be high to activate 1Y |
| 1Y | Channel 1 Open-Collector Output | Sinks current to GND when enabled; requires external pull-up to load voltage (up to 30 V) |
| GND | Ground Reference | Common return path for logic inputs, supply, and output current sinks |
| VCC | Positive Supply | 5V logic supply input; bypassed with 0.1 µF capacitor near the pin per layout guidelines |
| 2A | Channel 2 Logic Input A | Independent AND input for second driver channel - electrically isolated from Channel 1 |
| 2B | Channel 2 Logic Input B | Second input for Channel 2 AND gate; identical electrical behavior to 1A/1B |
| 2Y | Channel 2 Open-Collector Output | Independent current sink output; supports separate high-voltage load control from Channel 1 |
Key Features
| Feature | Design Value |
|---|---|
| No latch-up at 20V/300mA | Guarantees robust operation under transient overvoltage and overload conditions without destructive failure |
| TTL-compatible diode-clamped inputs | Eliminates need for external clamping diodes or series resistors in standard 5V logic interfaces |
| Open-collector outputs | Enables flexible voltage translation, wired-OR logic, and direct connection to loads referenced to voltages >5V |
| High-speed switching (≤25ns) | Supports clean edge transitions in timing-critical applications such as pulse-width modulation or strobe control |
| Characterized for 0°C to 70°C | Validated performance across full commercial temperature range - suitable for office, lab, and non-automotive industrial use |
Applications
| Lamp Driver | LED Driver |
|---|---|
Use Scenario: Driving incandescent or halogen indicator lamps rated up to 24V in test equipment front panels. IC Role / Device Role / Timing Role: Dual-channel AND gate driver providing isolated, logic-controlled lamp activation with current limiting via external series resistor. Use Value: Eliminates need for discrete transistors and base resistors; simplifies PCB layout while maintaining TTL-level control compatibility. | Use Scenario: Controlling high-brightness LED arrays in signage or status indicators requiring >100mA per segment. IC Role / Device Role / Timing Role: High-current open-collector sink enabling precise PWM dimming via microcontroller GPIOs. Use Value: Delivers 300mA per channel without thermal derating at room temperature - supports compact, fanless designs. |
| Line Driver | Memory Driver |
Use Scenario: Buffering TTL-level address/data signals onto long PCB traces or backplane stubs subject to capacitive loading. IC Role / Device Role / Timing Role: Low-propagation-delay AND driver strengthening signal edges to maintain setup/hold timing margins. Use Value: 18–25ns delay ensures signal integrity in 20MHz+ parallel bus applications without added timing uncertainty. | Use Scenario: Enabling/disabling memory chip select lines in embedded systems with multiple SRAM or EPROM devices. IC Role / Device Role / Timing Role: Dual AND gate acting as gated enable for memory banks - both inputs required high to assert CS#. Use Value: Prevents accidental memory access during reset or configuration; eliminates need for additional logic gates or CPLD resources. |
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 silicon, SOIC-8 package, tube packaging (75 pcs) vs. tape-and-reel (2500 pcs); identical electrical specs and pinout | No functional difference - differs only in packaging format and reel quantity | Select SN75451BDRE4 for automated SMT assembly; choose SN75451BD for prototyping or low-volume hand soldering |
| SN75452BDRE4 | NAND logic function instead of AND; otherwise identical pinout, ratings, and thermal characteristics | Requires inverted control logic - active-low enable instead of active-high; unsuitable where AND behavior is mandatory | Use only if system design accommodates NAND truth table; not a drop-in replacement for AND functionality |
Compared with SN75451BD and SN75452BDRE4, the SN75451BDRE4 provides verified AND logic in tape-and-reel format optimized for production SMT lines, while avoiding logic inversion or packaging mismatches that would require schematic or firmware changes.
Availability
SN75451BDRE4 is available at Aetrix Electronics and suitable for lamp drivers, LED drivers, line drivers, and memory drivers requiring stable component supply across commercial temperature ranges and high-current sinking capability.
Supply support for SN75451BDRE4 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 with emphasis on reliability, longevity, and broad technical support.
The SN7545xB family was designed specifically for TTL-compatible peripheral interfacing - bridging low-voltage logic controllers to higher-power, higher-voltage loads while ensuring latch-up immunity and predictable timing behavior in industrial and instrumentation applications.
FAQ
What logic function does the SN75451BDRE4 implement?
The SN75451BDRE4 implements a dual AND gate function: each channel's output (1Y or 2Y) is active (low) only when both corresponding inputs (1A & 1B, or 2A & 2B) are high. This is confirmed by the function table in Section 8.4 of the TI datasheet and matches the positive-logic AND symbol in Figure 8-5. The SN75451BDRE4 does not provide NAND, OR, or NOR functions - those are implemented by other members of the SN7545xB family.
Can the SN75451BDRE4 drive a 24V relay coil directly?
Yes, the SN75451BDRE4 can drive a 24V relay coil directly using its open-collector output - provided the coil's steady-state current remains ≤300mA and inductive flyback energy is managed. TI's typical application diagram (Figure 9-1) shows exactly this use case. A flyback diode must be placed across the coil, and the output pull-up should connect to the 24V rail. The SN75451BDRE4's 30V absolute max output voltage rating and latch-up immunity at 20V/300mA make it suitable for this application.
What is the maximum continuous output current per channel for the SN75451BDRE4?
The maximum continuous output current per channel for the SN75451BDRE4 is 300mA, as characterized in the "Features" section and confirmed in Absolute Maximum Ratings (IOK = 400mA peak, but continuous rating is 300mA). This value is validated across the full operating temperature range (0°C to 70°C) and assumes proper PCB thermal design - including adequate copper pour and trace width - to maintain junction temperature below 150°C. Exceeding 300mA continuously risks thermal shutdown or accelerated degradation.
Does the SN75451BDRE4 require external pull-up resistors on its outputs?
Yes, the SN75451BDRE4 requires external pull-up resistors on both 1Y and 2Y outputs because they are open-collector. These resistors connect between the output pin and the desired load supply voltage (up to 30V). Their value determines output rise time and power dissipation - TI recommends selecting based on load current and acceptable voltage drop. No internal pull-ups exist; omission results in floating, non-functional outputs.
Is the SN75451BDRE4 RoHS compliant and lead-free?
Yes, the SN75451BDRE4 is RoHS compliant and lead-free. Per TI's Package Option Addendum, the part marking "75451B" appears on devices with NIPDAU (Nickel/Palladium/Gold) lead finish, and the "E4" suffix denotes RoHS-compliant packaging. Its MSL rating is Level-1-260°C-UNLIM, confirming suitability for standard lead-free reflow profiles without moisture sensitivity concerns.
SN75451BDRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
SN75451BDRE4 FAQ
1.How can I place an order for SN75451BDRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN75451BDRE4 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 SN75451BDRE4 reliable?
The price and inventory of SN75451BDRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN75451BDRE4 is usually 5 days.
3.What payment methods are accepted for SN75451BDRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN75451BDRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN75451BDRE4?
SN75451BDRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN75451BDRE4 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 SN75451BDRE4?
For technical support, including SN75451BDRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN75451BDRE4 requirements.
6.How does Aetrix verify that SN75451BDRE4 is sourced from the original manufacturer or authorized distributors?
All SN75451BDRE4 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 SN75451BDRE4 meets industry standards.
7.What is the process for return or replacement of SN75451BDRE4?
All SN75451BDRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN75451BDRE4, 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 SN75451BDRE4 part is unused and in its original packaging.
Return procedure for SN75451BDRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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