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Texas Instruments SN75471P
- Part No.:
- SN75471P
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
SN75471P.pdf
- Description:
- IC PERIPHERAL DRIVER 5.25V 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:557
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Product details
Overview
SN75471P from Texas Instruments is a dual peripheral AND driver IC designed for high-voltage, high-current switching in industrial and legacy logic interface applications. It delivers 300 mA continuous output current per channel, supports up to 70 V off-state output voltage, operates from 4.75 V to 5.25 V supply, and functions across 0°C to 70°C ambient temperature - enabling direct drive of relays, lamps, and MOSFET gates without external buffering.
For engineers reviewing the SN75471P datasheet, SN75471P pinout, SN75471P application, or SN75471P equivalent, key selection criteria include its TTL-compatible diode-clamped inputs, latch-up immunity at 55 V after conducting 300 mA, medium-speed switching (tPLH/tPHL ≤ 55/40 ns), plastic DIP-8 package with copper lead frame for improved thermal reliability, and functional interchangeability with SN75451B/SN75461 in higher-breakdown-voltage systems.
Technical Context
The SN75471P integrates two independent AND-gate drivers with open-collector npn output transistors, each internally connected to TTL-compatible input logic via diode-clamped bases. Its architecture enables direct interfacing between low-voltage logic and high-voltage loads while maintaining isolation up to 70 V on inactive outputs.
Each channel features internal base-drive resistors (1 kΩ, 4 kΩ, 1.6 kΩ) and emitter termination (130 Ω), supporting robust 300 mA sink capability without external components. The device avoids latch-up under transient overvoltage conditions (55 V, 300 mA) and maintains stable operation within ±0.25 V VOL at 100 mA and ≤0.7 V at 300 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures compatibility with standard 5 V TTL/CMOS logic rails and stable biasing of internal transistor networks. |
| Output Current (Continuous) | 300 mA per channel - sufficient to directly drive electromechanical relays, incandescent lamps, and power MOSFET gates without external amplification. |
| Off-State Output Voltage | 70 V - enables safe operation in industrial control circuits where inductive kickback or bus voltages exceed 50 V. |
| Propagation Delay | tPLH ≤ 55 ns, tPHL ≤ 40 ns - supports medium-speed digital control (≤10 MHz toggle rate) in timing-critical peripheral interfaces. |
| Input Compatibility | TTL-compatible diode-clamped inputs - accepts standard 0.8 V / 2.0 V logic thresholds and provides inherent ESD protection without external clamps. |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial equipment environments without derating below 70°C ambient. |
| Package Thermal Rating | 1000 mW at TA ≤ 25°C, 640 mW at TA = 70°C (PDIP-8) - enables sustained 300 mA operation with minimal heatsinking in enclosed enclosures. |
Pinout & Package
SN75471P uses an 8-pin plastic dual in-line package (PDIP-8) with copper lead frame for enhanced thermal conduction and long-term reliability in high-power switching applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A | Input A of Driver 1 and Driver 2 | TTL-compatible logic input; diode-clamped to GND for overvoltage protection and noise immunity. |
| 1B, 2B | Input B of Driver 1 and Driver 2 | Second TTL-compatible logic input per gate; enables AND-function evaluation before driving output transistor. |
| 1Y, 2Y | Open-collector output of Driver 1 and Driver 2 | NPN collector output; sinks up to 300 mA; requires external pull-up to load supply (up to 70 V). |
| VCC | Positive supply rail | 5 V logic supply input; powers internal resistor network and input clamping diodes. |
| GND | Ground reference | Common return path for inputs, internal biasing, and output emitter connections. |
Key Features
| Feature | Design Value |
|---|---|
| No latch-up at 55 V after 300 mA conduction | Ensures fault resilience during inductive load turn-off transients without destructive failure or system reset. |
| Plastic DIP-8 with copper lead frame | Reduces thermal resistance by ~25% vs. standard iron-lead frames, improving power handling and long-term solder joint integrity. |
| Diode-clamped TTL inputs | Eliminates need for external Schottky clamps while maintaining noise margin and preventing input overvoltage damage. |
| Characterized for 0°C to 70°C operation | Validated performance across full commercial temperature range without parameter drift or timing violation. |
| Functionally interchangeable with SN75451B/SN75461 | Enables drop-in replacement in legacy designs requiring higher breakdown voltage, with documented trade-off in switching speed. |
Applications
| Relay Control Interface | Lamp Driver Module |
|---|---|
Use Scenario: Driving 24 VDC electromagnetic relays in PLC I/O modules with TTL-level microcontroller signals. IC Role / Device Role / Timing Role: Dual AND-gate driver providing isolated, current-sinking logic-level-to-high-voltage translation with built-in input protection. Use Value: Eliminates discrete transistor arrays and base resistors; sustains 300 mA relay coil current while surviving 55 V inductive flyback without latch-up. |
Use Scenario: Controlling 12 V automotive indicator lamps and panel backlighting in dashboard electronics. IC Role / Device Role / Timing Role: High-current open-collector switch enabling PWM dimming and on/off control from 5 V logic. Use Value: Delivers consistent 300 mA lamp current with <0.7 V saturation voltage, minimizing heat generation and enabling compact PCB layout. |
| MOSFET Gate Driver | Legacy Memory Address Buffer |
Use Scenario: Level-shifting and boosting gate drive for N-channel power MOSFETs in DC-DC converter auxiliary circuits. IC Role / Device Role / Timing Role: Logic-controlled current sink that pulls MOSFET gate low while tolerating 70 V drain-source voltage during switching transitions. Use Value: Supports fast turn-off (tPHL ≤ 40 ns) and withstands VDS spikes up to 70 V, reducing need for snubbers or gate protection diodes. |
Use Scenario: Buffering address lines in vintage 8-bit microprocessor systems (e.g., Z80, 6502) driving high-capacitance memory buses. IC Role / Device Role / Timing Role: Dual AND driver strengthening weak address signals while preserving logic polarity and timing integrity. Use Value: Maintains <55 ns propagation delay across temperature, ensuring setup/hold timing margins for 2 MHz–4 MHz memory access cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual peripheral driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN75471D | Same electrical specs and logic function; SOIC-8 package with 1.75 mm max height and moisture sensitivity level 1. | Better suited for automated SMT assembly and space-constrained PCBs; lower thermal mass than PDIP but reduced power dissipation (725 mW vs. 1000 mW at 25°C). | Select SN75471D when surface-mount manufacturing, smaller footprint, or reflow compatibility is required - verify thermal design for 300 mA loads. |
| SN75451B | Faster switching (tPLH/tPHL ≈ 35/25 ns), lower supply current (ICCL ≈ 45 mA), but limited to 45 V off-state output voltage and no 55 V latch-up immunity. | Preferred in high-speed logic buffer applications where voltage stress is <45 V and timing dominates reliability requirements. | Choose SN75451B only if system voltage remains ≤45 V and faster edge rates are critical - avoid in relay or inductive-load circuits exceeding 45 V. |
Compared with SN75471D and SN75451B, the SN75471P offers superior thermal robustness and 70 V off-state tolerance in through-hole packaging, making it optimal for repair, prototyping, and industrial control where mechanical stability and high-voltage resilience outweigh SMT density or nanosecond-scale speed.
Availability
SN75471P is available at Aetrix Electronics and suitable for relay control interfaces, lamp driver modules, MOSFET gate drivers, and legacy memory address buffering requiring stable component supply and long-lifecycle support.
Supply support for SN75471P 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN75471P belongs to TI's legacy peripheral driver family, engineered for robust high-voltage interfacing between TTL logic and power loads in industrial control, instrumentation, and retro-computing systems.
FAQ
What logic function does the SN75471P implement?
The SN75471P implements two independent dual-input AND gates with open-collector npn outputs. In positive logic, each output Y equals A AND B, and drives external loads by sinking current to ground. This configuration allows wired-OR expansion and direct connection to higher-voltage pull-up supplies up to 70 V, making the SN75471P ideal for level-shifting and power switching tasks where logic polarity must be preserved.
Can the SN75471P drive a 24 V relay coil drawing 280 mA?
Yes - the SN75471P is characterized for 300 mA continuous output current per channel and supports off-state output voltages up to 70 V. With a 24 V relay coil drawing 280 mA, the SN75471P maintains VOL ≤ 0.7 V at full load, dissipating less than 0.2 W per channel. Its latch-up immunity at 55 V ensures survival during inductive flyback, confirming reliable operation in real-world relay drive applications using the SN75471P.
How does the SN75471P differ from the SN75472P and SN75473P?
The SN75471P implements AND logic, while SN75472P is a dual NAND driver and SN75473P is a dual OR driver - all share identical pinout, package, voltage ratings, current capability, and thermal specifications. Their internal logic differs only in gate topology (AND vs. NAND vs. OR), resulting in distinct truth tables and complementary use cases. All three are drop-in replacements electrically and mechanically, requiring only logic-level redesign to match the target function.
Is the SN75471P RoHS compliant?
Yes - the SN75471P is RoHS compliant, with lead finish specified as NiPdAu (nickel-palladium-gold) per TI's official packaging addendum. It meets EU Directive 2011/65/EU requirements and carries no exemptions. The PDIP-8 package contains no leaded solder or hazardous substances above threshold limits, and is approved for use in environmentally regulated industrial and consumer products requiring full RoHS conformance.
What is the maximum allowable power dissipation for the SN75471P at 60°C ambient?
At 60°C ambient, the SN75471P's maximum allowable power dissipation is 720 mW. This is calculated using the PDIP-8 derating factor of 8.0 mW/°C: starting from 1000 mW at 25°C, subtract 8.0 mW × (60 − 25) = 280 mW, yielding 720 mW. This value ensures safe operation with 300 mA output current and <0.7 V saturation voltage, provided board layout includes adequate copper area for heat spreading and airflow is not restricted.
SN75471P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Peripheral Driver
- Number of Elements:
- 2
- Number of Bits per Element:
- 2
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -, 300mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
SN75471P FAQ
1.How can I place an order for SN75471P through Aetrix?
Please submit a Request for Quotation (RFQ) for SN75471P 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 SN75471P reliable?
The price and inventory of SN75471P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN75471P is usually 5 days.
3.What payment methods are accepted for SN75471P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN75471P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN75471P?
SN75471P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN75471P 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 SN75471P?
For technical support, including SN75471P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN75471P requirements.
6.How does Aetrix verify that SN75471P is sourced from the original manufacturer or authorized distributors?
All SN75471P 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 SN75471P meets industry standards.
7.What is the process for return or replacement of SN75471P?
All SN75471P units undergo pre-shipment inspection (PSI). If there is an issue with SN75471P, 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 SN75471P part is unused and in its original packaging.
Return procedure for SN75471P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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