2STA1943 Equivalent & Substitute Parts

Part Overview

The 2STA1943 is a PNP bipolar junction transistor manufactured by STMicroelectronics, rated for 230 V collector-emitter breakdown voltage and 15 A maximum collector current. This device is designed for high-power switching and amplification applications in through-hole TO-264 packaging. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and procurement needs.

Substiute Parts

2STA1943

STMicroelectronicsIn Stock: 399962STA1943 Datasheet

Current PartRFQ

2SA1943-O(Q)

Toshiba Semiconductor and StorageIn Stock: 201072SA1943-O(Q) Datasheet

DirectRFQ

2SA1943OTU

onsemiIn Stock: 22222SA1943OTU Datasheet

DirectRFQ

TTA1943(Q)

Toshiba Semiconductor and StorageIn Stock: 15810TTA1943(Q) Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2STA1943 is determined by electrical and mechanical parameter equivalence within the PNP bipolar transistor category. The critical parameters governing substitution are:

• Transistor Type: PNP configuration
• Current Rating: Minimum 15 A collector current capacity
• Voltage Rating: Minimum 230 V collector-emitter breakdown voltage
• Power Dissipation: 150 W maximum
• Frequency Response: 30 MHz transition frequency
• DC Current Gain: 80 (hFE minimum at specified conditions)
• Mounting Configuration: Through-hole technology
• Saturation Characteristics: Vce saturation at specified base and collector currents

Substitute parts are classified into two categories:

Direct Substitutes maintain identical or superior electrical specifications and compatible package footprints, enabling pin-for-pin or mechanical replacement with no circuit modification.

Similar Substitutes meet all core electrical requirements but employ different package configurations, requiring mechanical redesign or adapter solutions for board integration.

Parameter Comparison

Engineering Selection Recommendations

2SA1943OTU (onsemi) is the primary direct substitute for the 2STA1943. This part maintains identical TO-264-3 package compatibility, enabling direct board-level replacement without mechanical modification. The 2SA1943OTU exceeds the original specification with 17 A collector current capacity and 250 V breakdown voltage, providing design margin. Operating temperature range extends to -50°C, supporting broader environmental applications. Product status is active with established supply chain availability. ROHS3 compliance and EAR99 classification match the original part.

2SA1943-O(Q) (Toshiba) provides electrical equivalence with identical current, voltage, and power ratings. This part is active and ROHS3 compliant. The TO-3PL package differs from the original TO-264 configuration, requiring mechanical redesign and board layout modification. Selection of this substitute is appropriate when package footprint change is acceptable or when TO-3PL mounting is preferred for thermal management.

TTA1943(Q) (Toshiba) meets all core electrical specifications and maintains active product status with ROHS3 compliance. The TO-3PL package requires mechanical redesign equivalent to the 2SA1943-O(Q). Bulk packaging differs from the original tube format. This substitute is suitable for applications where package configuration change is feasible.

For applications requiring minimal design modification and immediate compatibility, 2SA1943OTU is the recommended selection. For applications where package change is acceptable, 2SA1943-O(Q) or TTA1943(Q) provide alternative sourcing options.

Frequently Asked Questions (FAQ)

Q: Can the 2SA1943OTU directly replace the 2STA1943 without circuit modification?

A: Yes. The 2SA1943OTU maintains identical TO-264-3 package pinout and exceeds all electrical specifications of the 2STA1943. No circuit modification is required for direct substitution.

Q: What is the primary difference between 2SA1943-O(Q) and 2SA1943OTU?

A: The 2SA1943-O(Q) uses TO-3PL packaging, while 2SA1943OTU uses TO-264-3 packaging. Electrical specifications are equivalent. Package selection determines mechanical compatibility with existing board designs.

Q: Does the 2SA1943OTU provide superior performance compared to the 2STA1943?

A: The 2SA1943OTU provides higher current capacity (17 A versus 15 A) and higher voltage rating (250 V versus 230 V). Operating temperature range is extended to -50°C. These parameters represent design margin improvements rather than performance enhancement for applications within 2STA1943 specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The 2SA1943-O(Q), 2SA1943OTU, and TTA1943(Q) are all ROHS3 compliant, matching the compliance status of the original 2STA1943.

Q: What packaging format is required for the 2SA1943OTU?

A: The 2SA1943OTU is supplied in tube packaging, identical to the original 2STA1943. The 2SA1943-O(Q) is supplied in tray format, and TTA1943(Q) is supplied in bulk format.

Q: Can TTA1943(Q) be used in applications requiring the original TO-264 package?

A: No. The TTA1943(Q) uses TO-3PL packaging. Board-level mechanical redesign is required for integration. The 2SA1943OTU maintains TO-264-3 compatibility for direct substitution.

Q: What is the operating temperature range of the 2SA1943OTU?

A: The 2SA1943OTU operates from -50°C to 150°C junction temperature, extending the lower temperature limit compared to the 2STA1943 specification of 150°C maximum.

Q: Are there any compliance or regulatory differences between substitute parts?

A: All substitute parts share identical ECCN (EAR99) and HTSUS (8541.29.0075) classifications with the original 2STA1943. REACH status is consistent across all active substitutes.