2SA10340SL PNP Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The 2SA10340SL is a PNP bipolar junction transistor manufactured by Panasonic Electronic Components, rated for 35 V collector-emitter breakdown voltage and 50 mA maximum collector current. This device is packaged in a Mini3-G1 surface mount configuration (TO-236-3/SOT-23-3) and operates at frequencies up to 200 MHz with a maximum power dissipation of 200 mW.

The 2SA10340SL is classified as an obsolete product. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor topology.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Ic) Maximum	50	mA
Collector-Emitter Breakdown Voltage (Max)	35	V
Vce Saturation @ Ib, Ic	600 mV @ 10 mA, 100 mA	—
Collector Cutoff Current (Max)	1	µA
DC Current Gain (hFE) Min @ Ic, Vce	260 @ 2 mA, 5 V	—
Power Dissipation (Max)	200	mW
Transition Frequency	200	MHz
Operating Temperature (Junction)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 2SA10340SL is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Transistor Type: PNP
Package / Case: TO-236-3, SC-59, or SOT-23-3 (surface mount)
Collector-Emitter Breakdown Voltage: Equal to or greater than 35 V
Collector Current (Ic) Maximum: Equal to or greater than 50 mA
Power Dissipation: Equal to or greater than 200 mW
Operating Temperature: 150°C or higher (junction temperature)
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

Transition Frequency: 100 MHz or higher
DC Current Gain (hFE): Minimum 125 or higher
Moisture Sensitivity Level: MSL 1 (Unlimited) preferred

Substitute parts are grouped into two categories based on electrical performance:

Category A – Direct Substitutes (Ic ≥ 50 mA, Vce(br) ≥ 35 V): Parts meeting or exceeding all mandatory parameters with minimal derating. These include BC858 series variants and equivalent devices.

Category B – Higher-Performance Substitutes (Ic > 50 mA, Vce(br) ≥ 30 V): Parts with enhanced current handling (1.5 A) and higher power dissipation (500 mW) that provide design margin and improved thermal performance. These include 2SB1695 series and 2STR2230.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce(br) (Max)	Power (Max)	Frequency	hFE Min	Package	Status
2SA10340SL	Panasonic	50 mA	35 V	200 mW	200 MHz	260 @ 2mA, 5V	SOT-23-3	Obsolete
BC858ALT1G	onsemi	100 mA	30 V	300 mW	100 MHz	125 @ 2mA, 5V	SOT-23-3	Active
BC858B,215	Nexperia USA Inc.	100 mA	30 V	250 mW	100 MHz	220 @ 2mA, 5V	SOT-23-3	Active
BC858B,235	Nexperia USA Inc.	100 mA	30 V	250 mW	100 MHz	220 @ 2mA, 5V	SOT-23-3	Active
BC858B-7-F	Diodes Incorporated	100 mA	30 V	300 mW	200 MHz	220 @ 2mA, 5V	SOT-23-3	Active
BC858BLT1G	onsemi	100 mA	30 V	300 mW	100 MHz	220 @ 2mA, 5V	SOT-23-3	Active
BC858CLT1G	onsemi	100 mA	30 V	300 mW	100 MHz	420 @ 2mA, 5V	SOT-23-3	Active
BC859B,215	NXP Semiconductors	100 mA	30 V	250 mW	100 MHz	220 @ 2mA, 5V	SOT-23-3	Active
2SB1695KT146	Rohm Semiconductor	1.5 A	30 V	200 mW	280 MHz	270 @ 100mA, 2V	SOT-23-3	Active
2SB1695TL	Rohm Semiconductor	1.5 A	30 V	500 mW	280 MHz	270 @ 100mA, 2V	SC-96	Active
2STR2230	STMicroelectronics	1.5 A	30 V	500 mW	100 MHz	170 @ 500mA, 2V	SOT-23-3	Active

Engineering Selection Recommendations

For Direct Replacement (Minimal Circuit Modification):

BC858B,215, BC858B,235, BC858BLT1G, and BC859B,215 are recommended as primary substitutes. These devices share the SOT-23-3 package, operate at 30 V collector-emitter breakdown voltage, and provide 100 mA collector current with 250–300 mW power dissipation. All are active products with RoHS3 compliance and AEC-Q101 automotive qualification (BC858B,215, BC858B,235, BC859B,215). These parts are suitable for applications where the 2SA10340SL collector current of 50 mA is within the design margin.

BC858B-7-F (Diodes Incorporated) offers the additional advantage of 200 MHz transition frequency, matching the 2SA10340SL specification, with 300 mW power dissipation and active product status.

For Enhanced Performance Applications:

2SB1695KT146 and 2STR2230 provide higher collector current (1.5 A) and enhanced power dissipation (200–500 mW), suitable for applications requiring design margin or thermal headroom. Both maintain SOT-23-3 packaging and 30 V breakdown voltage. 2SB1695KT146 offers 280 MHz transition frequency and RoHS3 compliance. 2STR2230 provides 500 mW power dissipation with extended operating temperature range (−65°C to 150°C).

Compliance Considerations:

All recommended substitutes are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. BC858B,215, BC858B,235, and BC859B,215 hold AEC-Q101 automotive qualification, suitable for automotive and industrial applications.

Package Compatibility:

2SB1695TL uses SC-96 package and is not recommended for direct replacement of SOT-23-3 applications without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can BC858B,215 directly replace 2SA10340SL without circuit modification?

A: BC858B,215 is electrically compatible for applications where collector current does not exceed 100 mA and collector-emitter voltage does not exceed 30 V. The 2SA10340SL rated for 35 V breakdown provides 5 V additional margin. If the circuit operates below 30 V and draws less than 100 mA, direct substitution is feasible. Verify saturation voltage specifications (600 mV vs. 650 mV) for switching applications.

Q: What is the difference between BC858B,215 and BC858B,235?

A: Both parts are manufactured by Nexperia USA Inc. with identical electrical specifications: 100 mA collector current, 30 V breakdown voltage, 250 mW power dissipation, and 100 MHz transition frequency. The suffix designations (,215 and ,235) indicate different packaging or tape reel configurations. Electrical performance is equivalent.

Q: Why is 2SB1695KT146 rated for 1.5 A when the 2SA10340SL is only 50 mA?

A: 2SB1695KT146 is a higher-performance device designed for applications requiring greater current handling. It is suitable as a substitute when the circuit can tolerate the higher current rating without adverse effects. The lower collector-emitter breakdown voltage (30 V vs. 35 V) must be verified against circuit requirements.

Q: Is BC858B-7-F preferred over BC858BLT1G?

A: BC858B-7-F (Diodes Incorporated) offers 200 MHz transition frequency, matching the 2SA10340SL specification, compared to 100 MHz for BC858BLT1G. Both provide 300 mW power dissipation and SOT-23-3 packaging. BC858B-7-F is preferred for high-frequency applications; BC858BLT1G is suitable for standard-frequency designs.

Q: Can 2SB1695TL be used in place of 2SA10340SL?

A: 2SB1695TL is electrically compatible but uses SC-96 package instead of SOT-23-3. Direct PCB substitution is not possible without redesign. If package change is acceptable, 2SB1695TL provides superior performance: 1.5 A collector current, 500 mW power dissipation, and 280 MHz transition frequency.

Q: What is the significance of DC Current Gain (hFE) differences among substitutes?

A: DC Current Gain affects base drive requirements and switching speed. The 2SA10340SL specifies hFE minimum of 260 @ 2 mA, 5 V. BC858 variants range from 125 to 420 depending on grade. Higher hFE reduces base current requirements; lower hFE requires increased base drive. Verify base circuit design accommodates the selected substitute's hFE specification.

Q: Are all recommended substitutes RoHS3 compliant?

A: Yes. All active substitute parts listed carry RoHS3 compliance certification. All maintain MSL 1 (Unlimited) moisture sensitivity rating, eliminating special handling requirements.

Q: Which substitute offers the best thermal performance?

A: 2SB1695TL and 2STR2230 both provide 500 mW maximum power dissipation, compared to 200 mW for the 2SA10340SL. These devices offer superior thermal performance for power-limited applications. 2STR2230 additionally provides extended operating temperature range (−65°C to 150°C).

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