BC817-40 Equivalent & Substitute Parts

Part Overview

The BC817-40 is an NPN bipolar junction transistor manufactured by STMicroelectronics in SOT-23-3 surface mount packaging. This device is rated for 45 V collector-emitter breakdown voltage, 500 mA maximum collector current, and 250 mW power dissipation. The BC817-40 is classified as obsolete product status, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, power dissipation, and package form factor.

Key Parameters

Parameter	BC817-40 Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	250	mW
Frequency - Transition	100	MHz
Operating Temperature (TJ)	150	°C
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	250 @ 100mA, 1V	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BC817-40 are selected based on strict electrical and mechanical compatibility. The primary substitution criteria are:

Critical Parameters for Substitution:

Transistor type must be NPN
Collector-emitter breakdown voltage must equal or exceed 45 V
Maximum collector current must equal or exceed 500 mA
Maximum power dissipation must equal or exceed 250 mW
Package must be TO-236-3, SC-59, or SOT-23-3 (surface mount)
Operating temperature range must support 150°C maximum junction temperature
RoHS3 compliance required

Substitution Groups:

Group 1: Direct Voltage Rating Equivalents (45 V) Parts maintaining the original 45 V collector-emitter breakdown voltage specification: BC817,215 and BC817,235 (Nexperia), BC817-16 RFG (Taiwan Semiconductor), BC817-16,215 and BC817-16,235 (Nexperia). These devices are active products with automotive qualification where applicable.

Group 2: Enhanced Voltage Rating Substitutes (50 V) Parts with increased collector-emitter breakdown voltage (50 V) providing additional design margin: 2PD602AQL,215 and 2PD602ARL,235 (Nexperia), 2SD1484KT146Q and 2SD1484KT146R (Rohm Semiconductor). These devices maintain 500 mA collector current and 250 mW power dissipation while offering higher voltage headroom.

Group 3: Enhanced Performance Substitutes (50 V, Higher Power) Part 50C02CH-TL-E (onsemi) provides 50 V rating with elevated power dissipation (700 mW) and significantly higher transition frequency (500 MHz), suitable for high-speed applications requiring enhanced thermal performance.

Parameter Comparison

Part Number	Manufacturer	Vce Breakdown (V)	Ic Max (mA)	Power Max (mW)	Frequency (MHz)	Package	Product Status
BC817-40	STMicroelectronics	45	500	250	100	SOT-23-3	Obsolete
BC817,215	Nexperia USA Inc.	45	500	250	100	TO-236AB	Active
BC817,235	Nexperia USA Inc.	45	500	250	100	TO-236AB	Active
BC817-16 RFG	Taiwan Semiconductor Corporation	45	500	300	100	SOT-23	Active
BC817-16,215	Nexperia USA Inc.	45	500	250	100	TO-236AB	Active
BC817-16,235	Nexperia USA Inc.	45	500	250	100	TO-236AB	Active
2PD602AQL,215	Nexperia USA Inc.	50	500	250	140	TO-236AB	Active
2PD602ARL,235	Nexperia USA Inc.	50	500	250	160	TO-236AB	Active
2SD1484KT146Q	Rohm Semiconductor	50	500	200	250	SMT3	Active
2SD1484KT146R	Rohm Semiconductor	50	500	200	250	SMT3	Active
50C02CH-TL-E	onsemi	50	500	700	500	3-CPH	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Specifications):

BC817,215 and BC817,235 (Nexperia USA Inc.) are direct functional equivalents to the BC817-40, maintaining identical 45 V collector-emitter breakdown voltage, 500 mA collector current, 250 mW power dissipation, and 100 MHz transition frequency. Both parts are active products with automotive-grade qualification (AEC-Q101) and ROHS3 compliance. BC817,215 is supplied in cut tape packaging, while BC817,235 is supplied in tape and reel format. These parts are recommended for applications requiring exact electrical parameter matching with active product support.

BC817-16,215 and BC817-16,235 (Nexperia USA Inc.) provide equivalent electrical performance with identical voltage, current, power, and frequency ratings. Both carry automotive qualification and are available in active product status. Selection between these variants depends on packaging format requirements (cut tape versus tape and reel).

For Applications Tolerating Increased Voltage Rating:

2PD602AQL,215 and 2PD602ARL,235 (Nexperia USA Inc.) provide 50 V collector-emitter breakdown voltage while maintaining 500 mA collector current and 250 mW power dissipation. These parts offer additional voltage design margin and are qualified to AEC-Q101 automotive standards. 2PD602ARL,235 provides higher transition frequency (160 MHz) compared to 2PD602AQL,215 (140 MHz).

For High-Speed or High-Power Applications:

2SD1484KT146Q and 2SD1484KT146R (Rohm Semiconductor) offer 50 V rating with 250 MHz transition frequency, suitable for applications requiring enhanced switching speed. Note that power dissipation is reduced to 200 mW; applications requiring full 250 mW dissipation should verify thermal requirements.

50C02CH-TL-E (onsemi) provides the highest performance envelope with 50 V rating, 500 MHz transition frequency, and 700 mW power dissipation. This part is suitable for high-frequency switching applications and designs with elevated thermal requirements.

Compliance and Qualification:

All substitute parts listed maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Automotive-qualified variants (AEC-Q101) are available from Nexperia for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can BC817,215 or BC817,235 be used as direct replacements for BC817-40?

A: Yes. BC817,215 and BC817,235 are functionally equivalent to BC817-40, maintaining identical electrical specifications: 45 V collector-emitter breakdown voltage, 500 mA maximum collector current, 250 mW power dissipation, and 100 MHz transition frequency. Both are active products with automotive qualification. The primary difference is packaging format (cut tape versus tape and reel).

Q: What is the difference between 45 V and 50 V rated devices?

A: The 50 V rated devices (2PD602 series and 2SD1484 series) provide additional voltage headroom above the original 45 V specification. These parts are suitable for applications where increased voltage margin is beneficial. However, they are not required for circuits designed to the 45 V specification of the BC817-40.

Q: Are the Rohm 2SD1484 devices suitable replacements despite lower power rating (200 mW)?

A: The 2SD1484 series is rated for 200 mW maximum power dissipation compared to the BC817-40 specification of 250 mW. Applications must verify that actual power dissipation does not exceed 200 mW. These devices offer significantly higher transition frequency (250 MHz) and are suitable for high-speed switching applications within their power envelope.

Q: What is the difference between 2PD602AQL,215 and 2PD602ARL,235?

A: Both parts are 50 V rated NPN transistors with 500 mA collector current and 250 mW power dissipation. The primary difference is transition frequency: 2PD602AQL,215 operates at 140 MHz while 2PD602ARL,235 operates at 160 MHz. Selection depends on application frequency requirements.

Q: Can 50C02CH-TL-E be used in all applications where BC817-40 is specified?

A: 50C02CH-TL-E provides enhanced performance with 500 MHz transition frequency and 700 mW power dissipation. However, it uses a different package designation (3-CPH) compared to the BC817-40 SOT-23-3 package. Physical PCB layout compatibility must be verified before substitution. The device is suitable for high-frequency applications but may introduce unnecessary cost and complexity for standard-speed circuits.

Q: Are all listed substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and are suitable for applications requiring RoHS compliance.

Q: What packaging formats are available for BC817 variants?

A: BC817 variants are available in cut tape (CT) and tape and reel (TR) packaging formats. BC817,215 and BC817-16,215 are supplied in cut tape format. BC817,235 and BC817-16,235 are supplied in tape and reel format. Selection depends on production volume and assembly equipment requirements.

Q: Do any substitute parts carry automotive qualification?

A: Yes. BC817,215, BC817,235, BC817-16,215, BC817-16,235, 2PD602AQL,215, and 2PD602ARL,235 carry AEC-Q101 automotive qualification. These parts are suitable for automotive applications requiring qualified components.

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