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Texas Instruments SN55454BJG
- Part No.:
- SN55454BJG
- Manufacturer:
- Texas Instruments
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
SN55454BJG.pdf
- Description:
- DUAL VERY-HIGH SPEED, HIGH-CURRE
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN55454BJG from Texas Instruments is a military-grade dual-peripheral NOR 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 lamp, LED, and line driving applications.
For engineers reviewing the SN55454BJG datasheet, SN55454BJG pinout, SN55454BJG application, or SN55454BJG equivalent, this page provides verified military-temperature specifications, CDIP-8 package details, NOR logic function confirmation, latch-up immunity at 20V/300mA, and direct alternatives for legacy peripheral interface designs.
Technical Context
The SN55454BJG implements dual independent NOR gates whose outputs drive NPN transistor stages with internal base resistors (1.6kΩ, 4kΩ), enabling direct high-current sinking without external biasing. Each channel operates as an active-low open-collector driver: output Y goes low only when both inputs A and B are low (per positive-logic NOR truth table).
It is characterized for full military temperature operation (–55°C to 125°C), uses standard 5V TTL supply (4.5–5.5V), and maintains latch-up immunity under 20V/300mA stress - a key differentiator from commercial SN7545xB variants limited to 0°C–70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | NOR gate per channel - drives load only when both inputs are low; enables wired-OR bus interfacing and active-low control. |
| Output Current | 300 mA continuous per channel - sufficient to directly drive lamps, relays, or LEDs without external buffers. |
| Off-State Voltage | 30 V maximum - allows safe interfacing with 24V industrial loads and legacy telecommunication lines. |
| Operating Temp | –55°C to 125°C - qualified for aerospace, defense, and downhole instrumentation where extended thermal range is mandatory. |
| Input Compatibility | TTL-compatible with diode-clamped inputs - accepts standard 0.8V/2.0V logic thresholds and suppresses noise-induced false triggering. |
| Propagation Delay | 27 ns typical (low-to-high) at 5V/25°C - supports >15 MHz digital switching in timing-critical peripheral interfaces. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with regulated 5V rails and tolerant of ±10% variation in military power systems. |
Pinout & Package
SN55454BJG is housed in an 8-pin Ceramic Dual In-line Package (CDIP) with 9.60 mm × 6.67 mm body size, hermetically sealed for high-reliability military use. Lead finish is SnPb (non-RoHS), and it is rated for manual soldering at 100°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A | Channel 1 Input A | Positive-logic NOR input; must be pulled low with ≤500 Ω to ensure reliable turn-on and avoid floating states. |
| 1B | Channel 1 Input B | Second positive-logic NOR input; tied together with 1A for single-input operation or grounded for always-active configuration. |
| 1Y | Channel 1 Output | Open-collector NPN output - sinks current to GND when both 1A and 1B are low; requires external pull-up for logic-high level. |
| GND | Ground Reference | Common return path for all inputs, outputs, and internal transistors; must be low-impedance for stable high-current switching. |
| VCC | Supply Voltage | +5V power rail; bypassed with 0.1 µF ceramic capacitor near pin to suppress switching noise and prevent supply droop. |
| 2A | Channel 2 Input A | Independent NOR input identical in function and electrical behavior to 1A; electrically isolated from Channel 1. |
| 2B | Channel 2 Input B | Independent NOR input identical in function and electrical behavior to 1B; no crosstalk with Channel 1 under normal operation. |
| 2Y | Channel 2 Output | Open-collector NPN output identical to 1Y; enables dual-load control (e.g., two lamps or one lamp + one relay) from single IC. |
Key Features
| Feature | Design Value |
|---|---|
| No latch-up at 20V/300mA | Guarantees robust operation during transient overvoltage events common in motor or solenoid switching environments. |
| Diode-clamped TTL inputs | Eliminates need for external clamping diodes and reduces board space while maintaining noise immunity up to ±1.5V input clamp voltage. |
| Open-collector outputs | Enables wired-OR bus architectures, level translation to higher voltages (e.g., 24V), and direct connection to mechanical relays or incandescent lamps. |
| Military temperature qualification | Validated performance across –55°C to 125°C ensures reliability in uncontrolled environments such as avionics bays or engine compartments. |
| Internal base resistors | Integrated 1.6 kΩ and 4 kΩ resistors eliminate external bias components, simplifying design and improving production consistency. |
Applications
| Lamp Driver | LED Driver |
|---|---|
Use Scenario: Driving incandescent pilot lamps in aircraft cockpit panels requiring direct 24V sinking capability and wide-temperature operation. IC Role / Device Role / Timing Role: Dual-channel NOR driver providing active-low sink control for two independent lamps; each channel handles up to 300mA steady-state current. Use Value: Eliminates need for discrete transistor arrays or relay drivers, reducing component count and failure points in safety-critical lighting systems. | Use Scenario: Controlling high-brightness status LEDs in military radio front panels exposed to extreme ambient temperatures. IC Role / Device Role / Timing Role: NOR-gated sink driver ensuring LED activation only when both control signals are low - supporting fail-safe illumination logic. Use Value: Delivers consistent brightness across –55°C to 125°C without thermal derating, unlike commercial-grade alternatives. |
| Line Driver | Memory Driver |
Use Scenario: Interfacing TTL logic to legacy 20 mA current-loop communication lines in industrial telemetry equipment. IC Role / Device Role / Timing Role: Open-collector NOR output configured as current-sink driver with external 24V pull-up, meeting EIA-232/RS-232 driver requirements. Use Value: Provides precise 300mA sink capability and fast 27 ns propagation delay to maintain signal integrity at 1 Mbps data rates. | Use Scenario: Driving address/data strobes in radiation-tolerant memory subsystems for satellite onboard computers. IC Role / Device Role / Timing Role: Dual NOR gate used to enable/disable memory chip select lines based on decoded address bits and system readiness flags. Use Value: Military temperature rating and latch-up immunity ensure uninterrupted operation during thermal cycling and single-event transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NOR driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN55454BFK | 20-pin LCCC package; same –55°C to 125°C rating but larger footprint and different pinout (with NC pins); higher power dissipation (1375 mW vs 1050 mW). | Used where hermetic sealing and higher thermal margin are prioritized over board space; requires PCB redesign due to incompatible pin mapping. | Select SN55454BFK only when thermal load exceeds CDIP-8 limits or when LCCC's superior high-frequency grounding is required. |
| SN75454BD | SOIC-8 package; commercial temperature range (0°C to 70°C); RoHS-compliant NiPdAu lead finish; lower max power (725 mW); same logic function and electrical specs within temp range. | Suitable for cost-sensitive industrial controls or consumer test equipment where extended temperature is not required. | Choose SN75454BD for non-military applications needing surface-mount assembly, RoHS compliance, and lower procurement cost. |
Compared with SN55454BFK and SN75454BD, SN55454BJG uniquely balances military temperature operation, compact CDIP-8 form factor, and proven field reliability in harsh environments - making it irreplaceable for legacy aerospace upgrades and MIL-STD-883 qualified designs.
Availability
SN55454BJG is available at Aetrix Electronics and suitable for lamp drivers, LED indicators, line drivers, and memory strobe circuits requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN55454BJG 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 U.S.-based semiconductor company specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and defense markets.
The SN5545xB family was developed to replace legacy SN75450-series drivers with enhanced latch-up immunity and military-grade temperature performance - targeting ruggedized peripheral interfacing in avionics, ground vehicles, and secure communications hardware.
FAQ
What logic function does the SN55454BJG implement?
The SN55454BJG implements a dual NOR gate function: each channel's output (1Y or 2Y) goes low only when both corresponding inputs (1A/1B or 2A/2B) are low. This is confirmed by the device's functional truth table, schematic diagrams, and logic symbols in the official TI datasheet SLRS021E. The SN55454BJG is specifically the NOR variant of the SN5545xB family.
Is SN55454BJG pin-compatible with SN75454BD?
No, SN55454BJG is not pin-compatible with SN75454BD. SN55454BJG uses an 8-pin CDIP (JG) package with pin 1 = 1A, pin 2 = 1B, pin 3 = 1Y, pin 4 = GND, pin 5 = 2Y, pin 6 = 2A, pin 7 = 2B, pin 8 = VCC. SN75454BD uses an 8-pin SOIC (D) package with identical pin numbering and assignment - however, the physical dimensions, thermal characteristics, and soldering profiles differ significantly. While the pinout matches, the packages are not mechanically interchangeable without layout revision.
What is the maximum continuous output current per channel for SN55454BJG?
The maximum continuous output current per channel for SN55454BJG is 300 mA, as specified in the "Characterized for use to 300mA" feature list and confirmed in Section 6.1 Absolute Maximum Ratings (IOK = 400 mA peak, 300 mA continuous). This value applies under recommended operating conditions (VCC = 4.5–5.5 V, TA ≤ 125°C) with proper PCB thermal management per the JG package dissipation rating of 1050 mW at 25°C.
Does SN55454BJG require external base resistors for transistor biasing?
No, SN55454BJG does not require external base resistors. Its internal schematic (Figure 8-12 in SLRS021E) shows integrated 1.6 kΩ and 4 kΩ base resistors for each NPN output transistor. These resistors provide appropriate drive current for the internal transistors across the full military temperature range, eliminating the need for external bias components and simplifying PCB layout.
Can SN55454BJG be used in place of SN55451BJG in an AND-driver application?
No, SN55454BJG cannot be used in place of SN55451BJG for AND-driver applications because they implement different logic functions. SN55451BJG is an AND driver (output low only when both inputs are high), while SN55454BJG is a NOR driver (output low only when both inputs are low). Substituting them would invert system logic behavior and cause functional failure unless the upstream control logic is redesigned to accommodate the complementary truth table.
SN55454BJG 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
SN55454BJG FAQ
1.How can I place an order for SN55454BJG through Aetrix?
Please submit a Request for Quotation (RFQ) for SN55454BJG 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 SN55454BJG reliable?
The price and inventory of SN55454BJG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN55454BJG is usually 5 days.
3.What payment methods are accepted for SN55454BJG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN55454BJG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN55454BJG?
SN55454BJG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN55454BJG 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 SN55454BJG?
For technical support, including SN55454BJG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN55454BJG requirements.
6.How does Aetrix verify that SN55454BJG is sourced from the original manufacturer or authorized distributors?
All SN55454BJG 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 SN55454BJG meets industry standards.
7.What is the process for return or replacement of SN55454BJG?
All SN55454BJG units undergo pre-shipment inspection (PSI). If there is an issue with SN55454BJG, 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 SN55454BJG part is unused and in its original packaging.
Return procedure for SN55454BJG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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