BA17808T Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The BA17808T is a linear voltage regulator IC manufactured by Rohm Semiconductor, designed for positive fixed 8V output applications with 1A current capacity in a TO-220-3 package. This component is classified as Not For New Designs, indicating it has reached end-of-life status. Finding equivalent or substitute parts is necessary for ongoing maintenance, repair, and legacy system support where BA17808T availability becomes constrained.

Substiute Parts

BA17808T

Rohm SemiconductorIn Stock: 5451BA17808T Datasheet

Current PartRFQ

UA7808CKCT

Texas InstrumentsIn Stock: 3101UA7808CKCT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BA17808T is determined by the following critical parameters:

• Fixed Output Voltage: 8V (non-negotiable for circuit compatibility)
• Output Current Capacity: Minimum 1A (equal or greater acceptable)
• Input Voltage Range: Maximum input voltage must accommodate system supply levels
• Package Type: TO-220-3 form factor for mechanical and thermal compatibility
• Voltage Dropout: Must not exceed application requirements at specified current
• Temperature Range: Operating temperature must cover intended application environment
• Compliance: RoHS3 compliance required for modern procurement standards

The UA7808CKCT from Texas Instruments meets these substitution criteria with enhanced specifications in several areas.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: UA7808CKCT (Texas Instruments)

The UA7808CKCT is a direct functional substitute for the BA17808T with the following engineering basis:

• Both devices deliver fixed 8V output in TO-220-3 packages, ensuring mechanical and thermal compatibility
• The UA7808CKCT meets or exceeds all critical electrical parameters: identical dropout voltage, higher output current capacity (1.5A vs 1A), and extended maximum input voltage (25V vs 23V)
• Both components maintain ROHS3 compliance, satisfying modern procurement and environmental requirements
• The UA7808CKCT is classified as Last Time Buy, indicating continued availability for near-term applications, whereas the BA17808T is Not For New Designs
• The UA7808CKCT includes integrated over-temperature and reverse-polarity protection, providing enhanced circuit reliability compared to the BA17808T

Selection Criteria:

Use the UA7808CKCT when the BA17808T is unavailable or when system requirements permit the extended operating temperature range (0°C ~ 125°C). The higher output current capacity and additional protection features make the UA7808CKCT suitable for applications requiring improved thermal margin or enhanced fault tolerance.

Frequently Asked Questions (FAQ)

Q: Can the UA7808CKCT directly replace the BA17808T in existing circuits?

A: Yes. Both devices are 8V fixed-output linear regulators in TO-220-3 packages with identical dropout voltage specifications. The UA7808CKCT's higher current rating (1.5A vs 1A) and extended input voltage range (25V vs 23V) make it a compatible upgrade. Pin configuration and functional behavior are equivalent.

Q: What is the significance of the higher output current rating on the UA7808CKCT?

A: The UA7808CKCT provides 1.5A output capacity compared to the BA17808T's 1A. This allows the substitute to handle higher load currents without thermal stress, improving system reliability and thermal margin in applications approaching the 1A limit.

Q: Are there temperature range limitations when substituting?

A: The BA17808T operates from -40°C to 85°C, while the UA7808CKCT operates from 0°C to 125°C. For applications requiring the full -40°C lower temperature limit, the BA17808T's extended low-temperature range must be verified as necessary. For standard industrial and commercial applications (0°C ~ 85°C), the UA7808CKCT is fully compatible.

Q: Do the protection features on the UA7808CKCT affect circuit design?

A: The UA7808CKCT includes integrated over-temperature and reverse-polarity protection. These features enhance circuit robustness without requiring design changes. Existing circuits designed for the BA17808T will function correctly with the UA7808CKCT; the protection features provide additional fault tolerance.

Q: What compliance certifications apply to both parts?

A: Both the BA17808T and UA7808CKCT are ROHS3 compliant and REACH unaffected, meeting modern environmental and procurement standards. Both carry EAR99 export classification and identical HTSUS codes (8542.39.0001).

Q: How do the PSRR specifications compare?

A: The BA17808T specifies 65dB PSRR at 120Hz, while the UA7808CKCT specifies 72dB ~ 62dB at 120Hz. The UA7808CKCT's PSRR range indicates superior noise rejection capability, beneficial for applications sensitive to power supply ripple.