BA3257FP-E2 Equivalent & Substitute Parts

Part Overview

The BA3257FP-E2 is a linear voltage regulator IC from Rohm Semiconductor designed for positive adjustable (fixed) output applications with dual 1A outputs in a TO-252-5 package. This component is classified as not for new designs, making identification of functionally equivalent alternatives essential for ongoing production support, maintenance applications, and legacy system repairs. The part delivers regulated power management in compact surface-mount form factor suitable for industrial and consumer electronics.

Key Parameters

Parameter	BA3257FP-E2
Manufacturer	Rohm Semiconductor
Category	Power Management (PMIC)
Package Type	TO-252-5 (DPAK)
Output Configuration	Positive, Adjustable (Fixed)
Number of Regulators	2
Output Current	1A, 1A
Input Voltage (Max)	14V
Output Voltage Range	1.25V to 12.7V
Dropout Voltage (Max)	1.3V @ 1A
Quiescent Current	3 mA
Operating Temperature	0°C to 85°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution of the BA3257FP-E2 is determined by the following critical parameters:

Dual-output configuration: Both main and substitute parts must provide 2 independent regulated outputs
Output current capability: Minimum 1A per output channel
Output voltage range: Support for adjustable or fixed output between 1.25V and 12.7V
Dropout voltage: Maximum 1.3V @ 1A to maintain regulation under load
Protection features: Over-current and over-temperature protection required
Surface-mount technology: Compatible with automated assembly processes
Compliance standards: ROHS3 compliance and EAR99 classification

The ST2L05R3300PS qualifies as a functional substitute based on matching these core electrical and mechanical parameters, despite differences in package form factor and maximum input voltage specification.

Parameter Comparison

Parameter	BA3257FP-E2	ST2L05R3300PS
Manufacturer	Rohm Semiconductor	STMicroelectronics
Output Configuration	Positive, Adjustable (Fixed)	Positive, Adjustable (Fixed)
Number of Regulators	2	2
Output Current	1A, 1A	1A, 1A
Input Voltage (Max)	14V	7V
Output Voltage (Min/Fixed)	1.25V (3.3V)	1.25V (3.3V)
Output Voltage (Max)	12.7V	5.7V
Dropout Voltage (Max)	1.3V @ 1A	1.3V @ 1A
Quiescent Current	3 mA	5 mA
PSRR	Not specified	60dB (120Hz)
Operating Temperature	0°C to 85°C	0°C to 125°C
Package Type	TO-252-5 (DPAK)	8-VDFN (5x6)
Product Status	Not For New Designs	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The ST2L05R3300PS serves as a functional equivalent for applications where the BA3257FP-E2 is no longer available. Selection between these parts depends on system-level constraints:

BA3257FP-E2 applicability: Retain for existing designs requiring TO-252-5 package compatibility and input voltage operation up to 14V. This part remains suitable for legacy system maintenance where PCB layout and thermal management are optimized for DPAK form factor.

ST2L05R3300PS applicability: Adopt for new production runs or redesigns where input voltage does not exceed 7V. The 8-VDFN package offers improved thermal performance and smaller footprint. Active product status ensures long-term availability and supply chain stability. Extended operating temperature range (0°C to 125°C) provides broader environmental coverage.

Both parts maintain ROHS3 compliance and identical dropout voltage specifications, ensuring functional interchangeability within their respective voltage domains. Package transition requires PCB layout modification and thermal analysis validation.

Frequently Asked Questions (FAQ)

Q: Can ST2L05R3300PS directly replace BA3257FP-E2 on existing PCBs?

A: No. The ST2L05R3300PS uses 8-VDFN package versus BA3257FP-E2's TO-252-5 package. PCB layout redesign is required. Pin configuration and thermal pad placement differ significantly.

Q: What is the maximum input voltage limitation for ST2L05R3300PS?

A: ST2L05R3300PS specifies 7V maximum input voltage compared to BA3257FP-E2's 14V. Applications requiring higher input voltage must retain BA3257FP-E2 or select alternative regulators with higher voltage ratings.

Q: Are both parts suitable for 3.3V fixed output applications?

A: Yes. Both parts support 3.3V fixed output configuration within their respective output voltage ranges and maintain 1.3V maximum dropout voltage at 1A load current.

Q: What is the thermal performance difference between packages?

A: The 8-VDFN exposed pad package of ST2L05R3300PS provides superior thermal dissipation compared to TO-252-5 DPAK. Thermal design calculations must account for package-specific thermal resistance values.

Q: Are there supply chain differences between these parts?

A: BA3257FP-E2 is not for new designs with limited ongoing availability. ST2L05R3300PS maintains active product status with established supply channels, making it preferable for production continuity.

Q: Do both parts require identical external component values?

A: External capacitor and resistor values depend on output voltage configuration and load characteristics. Consult respective manufacturer datasheets for specific application circuits. Adjustable output versions may require different feedback resistor networks.

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