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Texas Instruments SN75477DRE4
- Part No.:
- SN75477DRE4
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN75477DRE4.pdf
- Description:
- IC PERIPHERAL DRIVER 5.5V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,836
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Product details
Overview
SN75477DRE4 from Texas Instruments is a dual NAND peripheral driver IC designed for high-voltage, high-current switching in electromechanical interface circuits. It delivers 300 mA continuous output current per channel, supports 100 V typical output breakdown voltage, features diode-clamped TTL/MOS-compatible inputs, and operates across 0°C to 70°C - enabling reliable hammer-driver and relay-control applications.
For engineers reviewing the SN75477DRE4 datasheet, SN75477DRE4 pinout, SN75477DRE4 application, or SN75477DRE4 equivalent, this page provides verified functional identity, SOIC-8 package mapping, confirmed NAND logic behavior, output clamp diode specifications, and validated alternative options for industrial peripheral driving.
Technical Context
The SN75477DRE4 implements two independent NAND-gate peripheral drivers with pnp transistor inputs that reduce input current draw and enable direct TTL/MOS interfacing. Each channel integrates high-voltage output clamp diodes rated for 300 mA/70 V transient suppression and exhibits no latch-up at 55 V after conducting full-rated current.
Its logic function follows Y = A·S (positive-logic NAND), with propagation delays of 200–350 ns and transition times under 125 ns at 5 V supply. The device is characterized for 4.5 V to 5.5 V operation and requires no external biasing for standard peripheral loads such as solenoids, relays, or stepper motor windings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | NAND gate per channel (Y = A·S) |
| Continuous Output Current | 300 mA per channel - drives relays, solenoids, and small motors directly |
| Output Breakdown Voltage | 70–100 V typical - enables safe switching of inductive loads up to 55 V supply rails |
| Input Compatibility | TTL- and MOS-compatible with diode-clamped inputs - eliminates need for level-shifting circuitry |
| Operating Temperature | 0°C to 70°C - qualified for commercial industrial control environments |
| Supply Voltage Range | 4.5 V to 5.5 V - stable operation within standard 5 V logic rail tolerances |
| Propagation Delay | 200–350 ns - supports medium-speed peripheral control without timing bottlenecks |
Pinout & Package
SN75477DRE4 is housed in an 8-pin SOIC (D) package with 1.27 mm pitch, 3.9 mm body width, and 1.75 mm max height - compatible with standard surface-mount assembly processes and IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1A) | Input A for Channel 1 | NAND input; accepts TTL/MOS logic levels; internally clamped |
| 2 (1Y) | Output Y for Channel 1 | High-current open-collector output with integrated clamp diode |
| 3 (GND) | Ground Reference | Common return for both channels and internal bias networks |
| 4 (CLAMP) | External Clamp Diode Anode | Connects to cathode of external flyback diode for enhanced transient protection |
| 5 (VCC) | Positive Supply | 5 V nominal supply; powers internal logic and output stages |
| 6 (2A) | Input A for Channel 2 | Independent NAND input; electrically isolated from Channel 1 |
| 7 (2Y) | Output Y for Channel 2 | Second high-current output with identical clamp and voltage ratings |
| 8 (S) | Enable Input (Shared) | Active-high enable controlling both outputs simultaneously |
Key Features
| Feature | Design Value |
|---|---|
| No latch-up at 55 V | Ensures robust operation during inductive kickback events without destructive failure |
| Integrated output clamp diodes | Eliminates need for discrete external flyback diodes in most relay/solenoid designs |
| pnp transistor inputs | Reduces input current to ≤ –220 µA (low-level), easing drive requirements from microcontrollers |
| Diode-clamped TTL/MOS inputs | Accepts 0.8 V / 2.0 V logic thresholds directly - no pull-ups or level shifters required |
| Plastic SOIC thermal performance | Rated 464 mW at 70°C ambient - sufficient for dual 300 mA switching with minimal heatsinking |
Applications
| Relay Driver Module | Dot-Matrix Printer Head Control |
|---|---|
Use Scenario: Driving 12 V/24 V electromagnetic relays in PLC I/O modules and industrial controllers. IC Role / Device Role / Timing Role: Dual-channel NAND gate driver providing isolated, high-voltage switching with built-in transient suppression. Use Value: Eliminates external clamp diodes and reduces PCB footprint by integrating protection and logic in one SOIC-8 package. |
Use Scenario: Controlling print head solenoids in legacy impact printers requiring precise timing and high peak current. IC Role / Device Role / Timing Role: Peripheral driver delivering 300 mA pulses with <350 ns propagation delay to synchronize hammer actuation. Use Value: Enables direct microcontroller interfacing without buffer stages while surviving repeated inductive transients. |
| Industrial Stepper Motor Winding Driver | Test Equipment Signal Switching |
Use Scenario: Sequencing unipolar stepper motor phases in CNC motion controllers and automation equipment. IC Role / Device Role / Timing Role: Dual NAND-based driver translating step/direction logic into high-current winding activation. Use Value: Supports 55 V inductive flyback margin and operates reliably across 0°C–70°C ambient without derating. |
Use Scenario: Routing test signals between DUT and instrumentation in automated test systems with high-voltage isolation needs. IC Role / Device Role / Timing Role: High-voltage switch enabling signal path selection up to 70 V with fast turn-on/turn-off. Use Value: Provides clean, low-jitter switching with sub-125 ns transition times and no latch-up risk during fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual NAND peripheral driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN75477P | Same logic function and electrical specs, but in 8-pin PDIP package with higher 640 mW power rating at 70°C | Better thermal performance in through-hole prototyping or low-volume industrial assemblies | Select SN75477P when manual soldering, breadboarding, or higher ambient thermal margin is required |
| ULN2003A | Seven Darlington drivers with 500 mA rating per channel, open-collector outputs, no NAND logic - requires external logic gates | Higher channel count and current, but lacks integrated NAND functionality and requires additional logic components | Choose ULN2003A only when multi-channel sinking capability outweighs need for on-chip logic integration |
Compared with SN75477DRE4, SN75477P offers identical functionality in a thermally superior through-hole package, while ULN2003A trades NAND logic integration for greater channel density and current capacity - making SN75477DRE4 optimal for space-constrained, logic-integrated dual-peripheral applications.
Availability
SN75477DRE4 is available at Aetrix Electronics and suitable for relay driver modules, printer head control circuits, and industrial stepper motor winding interfaces requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN75477DRE4 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 SN75477DRE4 belongs to TI's legacy dual peripheral driver family, engineered specifically for robust high-voltage, high-current interface between digital logic and electromechanical loads like relays and solenoids.
FAQ
What logic function does the SN75477DRE4 implement?
The SN75477DRE4 implements a dual NAND gate peripheral driver, where each channel follows the positive-logic function Y = A·S. Its truth table confirms high output only when both inputs A and S are high; all other combinations yield low output. This behavior is explicitly defined in the SLRS025A datasheet and verified across temperature and supply ranges.
Does the SN75477DRE4 require external flyback diodes for inductive loads?
The SN75477DRE4 integrates internal clamp diodes rated for 300 mA and 70 V reverse voltage, reducing or eliminating the need for external flyback diodes in many applications. However, for high-energy inductive loads or worst-case transient conditions, connecting an external diode to the CLAMP pin (Pin 4) is recommended to enhance reliability - as specified in the datasheet's application guidance.
What is the maximum continuous output current per channel of the SN75477DRE4?
The SN75477DRE4 is characterized for 300 mA continuous output current per channel under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). Absolute maximum rating allows 400 mA continuous, but sustained operation above 300 mA requires careful thermal management due to SOIC package power dissipation limits.
Can the SN75477DRE4 be used with 3.3 V logic controllers?
The SN75477DRE4 inputs are TTL- and MOS-compatible with diode clamping, but its guaranteed input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) align with 5 V logic families. While it may function with 3.3 V controllers in some cases, TI does not characterize or guarantee operation below 4.5 V supply, and marginal noise margins exist - so level-shifting or 5 V interface buffering is advised for robust 3.3 V system integration.
What package type and dimensions does the SN75477DRE4 use?
The SN75477DRE4 uses an 8-pin SOIC (D) package per JEDEC MS-012 variation AA, with 1.27 mm lead pitch, 3.9 mm body width, 4.9 mm body length, and 1.75 mm maximum height. Its tape-and-reel packaging (2500 units per reel) conforms to standard SMT assembly guidelines, including IPC-7351 land patterns and stencil design recommendations published by Texas Instruments.
SN75477DRE4 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:
- 1
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -, 300mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SN75477DRE4 FAQ
1.How can I place an order for SN75477DRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN75477DRE4 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 SN75477DRE4 reliable?
The price and inventory of SN75477DRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN75477DRE4 is usually 5 days.
3.What payment methods are accepted for SN75477DRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN75477DRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN75477DRE4?
SN75477DRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN75477DRE4 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 SN75477DRE4?
For technical support, including SN75477DRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN75477DRE4 requirements.
6.How does Aetrix verify that SN75477DRE4 is sourced from the original manufacturer or authorized distributors?
All SN75477DRE4 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 SN75477DRE4 meets industry standards.
7.What is the process for return or replacement of SN75477DRE4?
All SN75477DRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN75477DRE4, 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 SN75477DRE4 part is unused and in its original packaging.
Return procedure for SN75477DRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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