SI-3012KD Equivalent & Substitute Parts

Part Overview

The SI-3012KD is a linear voltage regulator IC manufactured by Sanken Electric USA Inc., designed for positive adjustable output applications with 1A current capacity in a TO-263-5 surface mount package. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity. The regulator provides adjustable output voltage between 1.5V and 5V with integrated over-current and over-temperature protection.

Substiute Parts

SI-3012KD

Sanken Electric USA Inc.In Stock: 1156SI-3012KD Datasheet

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REG104FA-A/500

Texas InstrumentsIn Stock: 2035REG104FA-A/500 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SI-3012KD is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Output configuration must be positive adjustable
• Output current rating must be ≥1A
• Maximum input voltage must be ≥17V or compatible with application input range
• Output voltage range must encompass or exceed 1.5V to 5V
• Voltage dropout must be ≤0.6V @ 1A or acceptable for application
• Protection features must include over-current and over-temperature protection

Mechanical Compatibility Requirements:

• Package type must be TO-263-5 (D2PAK) or pin-compatible equivalent
• Surface mount configuration required
• Lead count and pinout must match or be functionally equivalent

Regulatory & Environmental Requirements:

• RoHS compliance status must be acceptable for application
• Operating temperature range must support -30°C to 125°C or application-specific requirements
• MSL rating must be compatible with storage and handling procedures

The REG104FA-A/500 from Texas Instruments meets these substitution criteria within the allowed parameter tolerances for this product category.

Parameter Comparison

Engineering Selection Recommendations

The REG104FA-A/500 from Texas Instruments is electrically and mechanically compatible with the SI-3012KD for most applications. Both devices are end-of-life products (obsolete and last-time-buy status respectively), indicating limited future availability.

Selection Considerations:

Maximum input voltage differs between parts. The SI-3012KD supports 17V maximum input, while the REG104FA-A/500 is rated to 15V. Applications requiring input voltages above 15V must verify compatibility or select alternative sources.

Operating temperature ranges differ. The SI-3012KD operates from -30°C to 125°C, while the REG104FA-A/500 operates from -40°C to 85°C. Applications requiring operation above 85°C or below -40°C must verify suitability.

Quiescent current differs. The REG104FA-A/500 draws 0.7 mA compared to 350 µA for the SI-3012KD. Low-power applications may be affected by this difference.

Moisture sensitivity level differs. The SI-3012KD has MSL 1 (unlimited shelf life), while the REG104FA-A/500 has MSL 2 (1-year shelf life). Storage and handling procedures must be adjusted accordingly.

Both devices provide equivalent protection features and are RoHS compliant. The REG104FA-A/500 offers improved PSRR (65dB vs 55dB) and lower dropout voltage (0.58V vs 0.6V).

Frequently Asked Questions (FAQ)

Q: Can the REG104FA-A/500 directly replace the SI-3012KD without PCB modifications?

A: The TO-263-5 and TO-263 (DDPAK-5) packages are mechanically compatible with identical pinouts. No PCB modifications are required for package compatibility. However, electrical parameter differences must be evaluated for your specific application.

Q: What is the maximum input voltage I can apply to the REG104FA-A/500?

A: The REG104FA-A/500 is rated for a maximum input voltage of 15V. If your application requires input voltages above 15V, this substitute is not suitable without additional circuit modifications.

Q: Are there differences in thermal performance between these regulators?

A: Both devices use the same TO-263 package with thermal tab for heat dissipation. The REG104FA-A/500 has a lower dropout voltage (0.58V vs 0.6V), which may result in slightly lower power dissipation under identical load conditions.

Q: How do the quiescent current specifications affect my design?

A: The REG104FA-A/500 draws 0.7 mA quiescent current compared to 350 µA for the SI-3012KD. In battery-powered or ultra-low-power applications, this 2x difference may be significant. Calculate standby power consumption for your specific application.

Q: What is the difference between RoHS and ROHS3 compliance?

A: Both designations indicate RoHS compliance. ROHS3 refers to compliance with the latest RoHS 3 directive. Both parts are acceptable for RoHS-compliant applications.

Q: Does the MSL 2 rating of the REG104FA-A/500 affect my manufacturing process?

A: MSL 2 indicates a 1-year shelf life in standard conditions (23°C, 50% relative humidity). The SI-3012KD has unlimited shelf life (MSL 1). If components are stored beyond 1 year or in high-humidity environments, baking procedures may be required before reflow soldering for the REG104FA-A/500.

Q: Can I use the REG104FA-A/500 in applications requiring operation above 85°C?

A: No. The REG104FA-A/500 is rated for operation up to 85°C maximum. The SI-3012KD supports operation to 125°C. Applications requiring higher temperature operation must use alternative components.