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Texas Instruments SN55451BJG
- Part No.:
- SN55451BJG
- Manufacturer:
- Texas Instruments
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
SN55451BJG.pdf
- Description:
- IC GATE DRVR LOW-SIDE 8CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,396
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Product details
Overview
SN55451BJG from Texas Instruments is a military-grade dual peripheral AND driver IC designed for high-current, high-speed switching in TTL-compatible systems. It delivers 300mA output current per channel, supports up to 30V off-state output voltage, operates across –55°C to 125°C, and features open-collector outputs with diode-clamped TTL inputs - used in ruggedized LED, lamp, and line driving applications.
For engineers reviewing the SN55451BJG datasheet, SN55451BJG pinout, SN55451BJG application, or SN55451BJG equivalent, this page provides verified functional modes, military-temperature electrical characteristics, CDIP-8 package thermal ratings, latch-up immunity data, and direct alternatives for high-reliability peripheral interfacing.
Technical Context
The SN55451BJG implements dual independent AND logic gates whose outputs drive internal NPN transistors with open-collector configuration. Each channel accepts TTL-level inputs (VIH = 2V, VIL = 0.8V) and sinks up to 300mA while maintaining VOH ≥ VS – 6.5V at 300mA load.
Its architecture ensures latch-up immunity at 20V after conducting 300mA, uses internal base-emitter resistors ≤500Ω to guarantee safe operation, and achieves propagation delays of 18–25ns (tPLH/tPHL) at 5V/25°C with 15pF load - enabling reliable interfacing between low-voltage logic and high-voltage/high-current peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 300 mA per channel - sufficient to directly drive lamps, LEDs, relays, or small solenoids without external amplification |
| Off-State Output Voltage | 30 V - enables interface with industrial 24V loads and legacy high-voltage signaling buses |
| Operating Temperature | –55°C to 125°C - qualified for aerospace, defense, and downhole industrial environments |
| Propagation Delay | 18–25 ns at 5V/25°C - supports high-speed digital control of switched loads with minimal timing skew |
| Input Compatibility | TTL diode-clamped - eliminates need for external clamping diodes when driven by standard 5V logic |
| Power Dissipation | 1050 mW at 25°C (CDIP-8) - requires no heatsink for typical 300mA pulsed operation |
| Latch-Up Immunity | No latch-up at 20V after 300mA conduction - ensures robust fault tolerance in transient-prone systems |
Pinout & Package
SN55451BJG is housed in an 8-pin Ceramic Dual In-line Package (CDIP) with 9.60mm × 6.67mm body size and through-hole mounting. The package is hermetically sealed, rated for military temperature operation, and features tin-lead (SNPB) lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A | Channel 1 Logic Input A | TTL-compatible input; must be tied to VCC or GND if unused to prevent floating logic state |
| 1B | Channel 1 Logic Input B | Second TTL input for AND function; both 1A and 1B must be HIGH to enable 1Y sink |
| 1Y | Channel 1 Open-Collector Output | Sinks current to GND when enabled; requires external pull-up to VS (up to 30V) for active-HIGH load control |
| GND | Ground Reference | Common return path for logic inputs, supply, and output current; must be low-impedance |
| VCC | Logic Supply Voltage | 4.5–5.5V nominal; powers internal logic and input clamps - bypass with 0.1µF capacitor |
| 2A | Channel 2 Logic Input A | Independent AND input for second 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 | Functionally identical to 1Y; enables dual-load control with shared or independent VS rails |
Key Features
| Feature | Design Value |
|---|---|
| Open-collector outputs | Enable flexible voltage translation: outputs can switch loads referenced to VS up to 30V, independent of 5V VCC rail |
| Diode-clamped TTL inputs | Eliminate need for external input protection; withstand –1.5V input clamp voltage and simplify MCU interface design |
| Military temperature range | –55°C to 125°C operation validated per MIL-PRF-38535 - suitable for avionics, space, and harsh-environment control |
| No latch-up at 20V/300mA | Guaranteed freedom from destructive latch-up during overvoltage or overload transients - critical for field reliability |
| High-speed switching | 18–25ns propagation delay supports >20MHz toggle rates for time-critical peripheral enable/disable sequencing |
Applications
| Industrial Lamp Control | High-Voltage Line Driving |
|---|---|
|
Use Scenario: Controlling 24V incandescent or halogen indicator lamps in factory HMIs and control panels. IC Role / Device Role / Timing Role: SN55451BJG acts as a ruggedized logic-level translator and current sink, enabling microcontroller GPIOs to safely switch lamps without level-shifting circuitry. Use Value: Delivers 300mA per channel at full military temperature range, eliminating external transistors and reducing BOM count by one transistor pair per lamp. |
Use Scenario: Driving RS-232 or proprietary 24V signaling lines in industrial automation backplanes. IC Role / Device Role / Timing Role: SN55451BJG serves as a high-voltage line driver with open-collector outputs pulled to 24V, providing clean digital transitions into capacitive bus loads. Use Value: Achieves 25ns max propagation delay and 30V off-state rating - meets timing budgets for 1Mbps+ serial interfaces while tolerating bus faults. |
| LED Array Switching | Ruggedized Memory Driver |
|
Use Scenario: Sequencing high-brightness LED banks in military display backlighting and status indicators. IC Role / Device Role / Timing Role: SN55451BJG functions as a dual-channel constant-current sink driver, with each 1Y/2Y output controlling a parallel LED string via external current-limiting resistor. Use Value: Sustains 300mA continuous per channel at 125°C ambient - enables compact, fanless LED driver designs in sealed enclosures. |
Use Scenario: Enabling/disabling memory chip select (CS) or output-enable (OE) signals in radiation-tolerant avionics memory modules. IC Role / Device Role / Timing Role: SN55451BJG provides fault-tolerant, high-current gating of memory control lines, ensuring deterministic assertion/deassertion under EMI and thermal stress. Use Value: Latch-up immunity at 20V/300mA prevents catastrophic failure during power-rail transients - critical for non-volatile memory integrity in flight systems. |
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 | Commercial temperature range (0°C to 70°C); SOIC-8 package; RoHS-compliant NiPdAu finish | Not qualified for military/aerospace use; lower thermal resistance (122.2°C/W) but no high-temp validation | Select for cost-sensitive industrial or consumer designs where extended temperature operation is unnecessary |
| SN55451BFK | Military temperature range; 20-pin LCCC package; higher power rating (1375 mW); no internal pin 1Y/2Y connection to GND | Requires PCB redesign due to 20-pin footprint and different pinout; better thermal performance but larger board area | Choose when higher power dissipation margin or hermetic ceramic packaging beyond CDIP is required |
Compared with SN75451BD and SN55451BFK, SN55451BJG uniquely balances military-grade temperature operation, proven CDIP-8 mechanical reliability, and direct compatibility with legacy JG-package layouts - making it optimal for drop-in replacement in existing high-reliability systems.
Availability
SN55451BJG is available at Aetrix Electronics and suitable for industrial lamp control, high-voltage line driving, LED array switching, and ruggedized memory driver applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN55451BJG 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 high-reliability components for industrial, automotive, aerospace, and communications markets.
SN55451BJG belongs to TI's legacy military-grade peripheral driver family, engineered specifically for robust TTL-to-high-voltage interfacing in safety-critical and mission-critical systems where latch-up immunity and wide temperature operation are mandatory.
FAQ
What logic function does SN55451BJG implement?
SN55451BJG implements dual independent AND logic gates. When both inputs (1A and 1B, or 2A and 2B) are HIGH (≥2V), the corresponding open-collector output (1Y or 2Y) turns ON and sinks current to GND. This behavior is confirmed in the device function table and logic diagram in the official datasheet. SN55451BJG does not provide NAND, OR, or NOR functionality - those are implemented in other members of the SN5545xB family.
Can SN55451BJG drive a 24V relay coil directly?
Yes, SN55451BJG can drive a 24V relay coil directly using its open-collector outputs. With a 24V pull-up on 1Y or 2Y, and assuming coil resistance ≥80Ω (to limit current to ≤300mA), SN55451BJG provides full saturation and reliable turn-on. Its 30V off-state rating and latch-up immunity at 20V make it suitable for inductive load switching in harsh environments - a key capability verified in the Absolute Maximum Ratings and Latch-Up Test sections of the SN55451BJG datasheet.
What is the maximum continuous output current for SN55451BJG?
The maximum continuous output current for SN55451BJG is 300 mA per channel, as characterized in the datasheet's "Features" and "Absolute Maximum Ratings" sections. This value is validated across the full –55°C to 125°C operating range. Exceeding 300 mA risks exceeding the 1050 mW power dissipation limit of the CDIP-8 package at elevated temperatures, potentially triggering thermal shutdown or long-term reliability degradation.
Does SN55451BJG require external input protection diodes?
No, SN55451BJG does not require external input protection diodes because it features integrated diode-clamped TTL inputs. The datasheet specifies a –1.5V input clamp voltage (VIK) at –12mA, confirming internal clamping to GND. This design eliminates the need for external Schottky diodes typically used with unclamped logic inputs - simplifying layout and improving reliability in systems subject to ESD or signal overshoot.
How does SN55451BJG differ from SN75451B in terms of temperature rating?
SN55451BJG is characterized for operation from –55°C to 125°C (military temperature range), whereas SN75451B is rated only from 0°C to 70°C (commercial range). This difference is explicitly stated in the "Device Comparison Table" and "Description" sections of the datasheet. The wider range of SN55451BJG is achieved through process and screening enhancements, making it suitable for aerospace, defense, and downhole applications where SN75451B would fail outside its specified limits.
SN55451BJG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 300µA, 300mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CDIP
SN55451BJG FAQ
1.How can I place an order for SN55451BJG through Aetrix?
Please submit a Request for Quotation (RFQ) for SN55451BJG 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 SN55451BJG reliable?
The price and inventory of SN55451BJG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN55451BJG is usually 5 days.
3.What payment methods are accepted for SN55451BJG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN55451BJG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN55451BJG?
SN55451BJG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN55451BJG 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 SN55451BJG?
For technical support, including SN55451BJG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN55451BJG requirements.
6.How does Aetrix verify that SN55451BJG is sourced from the original manufacturer or authorized distributors?
All SN55451BJG 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 SN55451BJG meets industry standards.
7.What is the process for return or replacement of SN55451BJG?
All SN55451BJG units undergo pre-shipment inspection (PSI). If there is an issue with SN55451BJG, 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 SN55451BJG part is unused and in its original packaging.
Return procedure for SN55451BJG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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