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Texas Instruments SN75447P
- Part No.:
- SN75447P
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
SN75447P.pdf
- Description:
- IC PERIPHERAL DRIVER 5.25V 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:72,189
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Product details
Overview
SN75447P from Texas Instruments is a dual NAND peripheral driver IC designed for high-voltage, high-current switching in electromechanical systems. It delivers 350 mA per channel, supports 70 V output breakdown voltage, features integrated output clamp diodes, and operates at 5 V with TTL/MOS-compatible inputs. It is used in hammer-driver circuits for telecommunication relay control.
For engineers reviewing the SN75447P datasheet, SN75447P pinout, SN75447P application, or SN75447P equivalent, key selection criteria include output clamp-diode capability (350 mA, 70 V), propagation delay (200–750 ns), low input current (≤10 µA), and operation over 0°C to 70°C without latch-up up to 50 V.
Technical Context
The SN75447P implements two independent NAND logic drivers with diode-clamped inputs and inductive-load clamp diodes on both outputs. Each channel supports simultaneous 350 mA conduction with 70 V breakdown rating and withstands transient energy via integrated 350 mA/70 V clamp diodes.
It uses standard 5 V TTL-compatible supply and logic thresholds (VIH = 2 V, VIL = 0.8 V), with propagation delays of 200–750 ns and transition times under 100 ns. The device is characterized for industrial temperature range (0°C to 70°C) and rated for 640 mW power dissipation in the 16-pin PDIP package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Dual 2-input NAND driver - enables active-low enable control of two independent high-side loads. |
| Output Current Rating | 350 mA per channel - sufficient to drive solenoids, relays, and printer hammers directly. |
| Output Breakdown Voltage | 70 V min - allows safe switching of inductive loads with flyback voltages up to 70 V. |
| Clamp Diode Rating | 350 mA / 70 V - integrated output clamp diodes suppress transients without external components. |
| Propagation Delay | 200–750 ns - ensures fast response for timing-critical electromechanical actuation. |
| Supply Voltage Range | 4.75 V to 5.25 V - tightly regulated 5 V operation compatible with standard TTL bus systems. |
| Input Current (IIH/IIL) | ±10 µA max - minimizes loading on upstream logic and reduces power in large arrays. |
Pinout & Package
SN75447P is housed in a 16-pin plastic dual in-line package (PDIP), with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, and thermal resistance θJA is 156.25 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Input A/S for Channel 1 & 2 | Two independent NAND inputs per channel: A (data), S (enable); active-low S disables output. |
| 5, 6 | Output Y for Channel 1 & 2 | Open-collector–like high-voltage outputs with internal clamp diodes; sink current only. |
| 7 | GND | Power ground reference for logic and output stages; must be low-impedance for clamp diode return path. |
| 8 | VCC | 5 V logic supply; powers input buffers and internal biasing; not connected to output stage supply. |
| 9–16 | CLAMP terminals | Four dedicated clamp diode anodes (pins 9,10,13,14) and cathodes (pins 11,12,15,16) - externally wired to load supply rails for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| No output latch-up at 50 V | Guarantees robust operation during inductive kickback events without destructive failure. |
| TTL- and MOS-compatible inputs | Accepts standard 5 V logic levels without level-shifting, simplifying interface with microcontrollers and gate arrays. |
| Diode-clamped inputs | Protects against negative transients down to −1.5 V, enabling reliable operation in noisy industrial environments. |
| High-voltage outputs (70 V min) | Directly switches 24 V, 48 V, or higher DC loads such as telecom relays and dot-matrix print head drivers. |
| Very low input current (≤10 µA) | Enables fan-out of >100 SN75447P inputs from a single TTL output without buffering. |
Applications
| Telecom Relay Control | Dot-Matrix Print Head Driver |
|---|---|
|
Use Scenario: Driving electromagnetic latching relays in central office line cards requiring fast, high-voltage switching. IC Role / Device Role / Timing Role: Dual NAND driver providing isolated, current-sinking control of relay coils with integrated transient suppression. Use Value: Eliminates need for four external flyback diodes and reduces PCB area by 30% compared to discrete transistor+diode solutions. |
Use Scenario: Selectively energizing print head solenoid rows in impact printers operating from 24–48 V supplies. IC Role / Device Role / Timing Role: High-speed, high-current sink driver enabling precise 200–750 ns pulse-width control of mechanical impact timing. Use Value: Supports 350 mA per row at 70 V breakdown, allowing direct drive of multi-coil print heads without external drivers. |
| Industrial Hammer Drivers | Electromechanical Test Fixture Control |
|
Use Scenario: Actuating pneumatic or solenoid-based test hammers in automated manufacturing test stations. IC Role / Device Role / Timing Role: Dual-channel logic-controlled switch delivering timed 350 mA pulses to hammer coils with built-in clamp protection. Use Value: Withstands repeated 50 V transients and maintains reliability over >1 million actuation cycles without derating. |
Use Scenario: Controlling multiple DUT (device-under-test) interface relays and fixture actuators in benchtop ATE systems. IC Role / Device Role / Timing Role: Low-power, high-isolation peripheral driver enabling parallel control of up to eight loads using four SN75447P devices. Use Value: Input current ≤10 µA allows direct connection to FPGA I/O banks without additional level shifters or buffers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage NAND driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ULN2003A | Seven Darlington drivers, open-collector, no NAND logic; 500 mA rating but no integrated clamp diode anodes/cathodes. | Requires external diodes for >30 V inductive loads; better suited for simple ON/OFF rather than logic-gated control. | Choose ULN2003A when needing >2 channels or higher current per channel without NAND gating. |
| SN75452BP | Dual non-inverting driver (AND function), identical pinout and clamp structure, same 350 mA/70 V rating. | Provides active-high output enable instead of NAND logic; requires inverted control signals for equivalent behavior. | Choose SN75452BP when system logic naturally provides high-enable signals and NAND inversion is undesirable. |
Compared with ULN2003A and SN75452BP, the SN75447P uniquely combines dual NAND logic, dedicated clamp terminal routing, and guaranteed 350 mA/70 V operation in a 16-pin PDIP-making it optimal for space-constrained, logic-gated electromechanical control where transient immunity and minimal external components are critical.
Availability
SN75447P is available at Aetrix Electronics and suitable for telecom relay control, dot-matrix print head driving, and industrial hammer-driver applications requiring stable component supply across long-lifecycle embedded systems.
Supply support for SN75447P 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 company founded in 1930, specializing in analog, embedded processing, and logic technologies with broad industrial and communications focus.
The SN75447P belongs to TI's legacy peripheral driver family, engineered specifically for high-reliability electromechanical interface applications including telephony, printing, and factory automation.
FAQ
What is the logic function of the SN75447P?
The SN75447P implements two independent 2-input NAND drivers. Each channel has separate A (data) and S (enable) inputs; the output Y is low only when both A and S are high. This enables active-low enable control of high-voltage loads. The SN75447P does not provide push-pull or three-state outputs - it is a dedicated sink-type NAND driver with integrated clamp diodes.
Can the SN75447P drive inductive loads without external diodes?
Yes - the SN75447P includes internal clamp diodes rated for 350 mA and 70 V, with dedicated CLAMP pins (9–16) for external connection to the load supply rail. When properly wired, these diodes safely dissipate flyback energy from relays and solenoids. External diodes are unnecessary unless peak transient energy exceeds the 350 mA/70 V rating or layout demands localized clamping.
What is the maximum continuous output current per channel for the SN75447P?
The SN75447P is characterized for continuous output current up to 350 mA per channel at TA = 25°C, with derated capability at higher temperatures. At 70°C ambient, the 16-pin PDIP package supports 350 mA only if total power dissipation remains within the 640 mW limit. For sustained 350 mA operation across the full 0°C–70°C range, board-level heatsinking or airflow is recommended.
Is the SN75447P pin-compatible with the SN75446P?
Yes - the SN75447P and SN75446P share identical pinout, package, and clamp terminal configuration. The only functional difference is logic: SN75446P implements AND gates (Y = A·S), while SN75447P implements NAND gates (Y = A·S̅). Signal timing, voltage ratings, and thermal specs are identical, enabling direct substitution when logic inversion is acceptable or compensated in firmware.
Does the SN75447P require a separate supply for its outputs?
No - the SN75447P uses a single 5 V supply (VCC, pin 8) for logic and biasing. Output switching occurs between the load supply (connected to CLAMP pins) and GND (pin 7). The internal output transistors are NPN-based sinks; their collector connects to the external load rail via CLAMP terminals, so no second supply is needed for core functionality.
SN75447P 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:
- -, 350mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
SN75447P FAQ
1.How can I place an order for SN75447P through Aetrix?
Please submit a Request for Quotation (RFQ) for SN75447P 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 SN75447P reliable?
The price and inventory of SN75447P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN75447P is usually 5 days.
3.What payment methods are accepted for SN75447P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN75447P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN75447P?
SN75447P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN75447P 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 SN75447P?
For technical support, including SN75447P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN75447P requirements.
6.How does Aetrix verify that SN75447P is sourced from the original manufacturer or authorized distributors?
All SN75447P 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 SN75447P meets industry standards.
7.What is the process for return or replacement of SN75447P?
All SN75447P units undergo pre-shipment inspection (PSI). If there is an issue with SN75447P, 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 SN75447P part is unused and in its original packaging.
Return procedure for SN75447P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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