BC817-40-7 Equivalent & Substitute Parts

Part Overview

The BC817-40-7 is a surface mount NPN bipolar junction transistor manufactured by Diodes Incorporated in SOT-23-3 packaging. This device is rated for 45 V collector-emitter breakdown voltage, 800 mA maximum collector current, and 310 mW maximum power dissipation. The BC817-40-7 is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements. Substitute parts must maintain electrical compatibility within the specified parameter ranges while meeting current product availability and compliance standards.

Key Parameters

Parameter	BC817-40-7	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	800	mA
Power - Max	310	mW
Frequency - Transition	100	MHz
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	V
DC Current Gain (hFE) (Min) @ Ic, Vce	250 @ 100mA, 1V	—
Operating Temperature	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3	—

Substitute Part Grouping Explanation

Substitute parts for the BC817-40-7 are grouped based on electrical parameter compatibility within the following criteria:

Primary Compatibility Parameters:

Transistor Type: NPN (required match)
Voltage - Collector Emitter Breakdown: minimum 45 V
Current - Collector (Ic) (Max): minimum 500 mA (acceptable reduction from 800 mA)
Power - Max: minimum 200 mW
Frequency - Transition: minimum 100 MHz
Mounting Type: Surface Mount (required match)
Operating Temperature Range: must encompass -65°C to 150°C or equivalent industrial range

Secondary Compatibility Parameters:

Vce Saturation characteristics
DC Current Gain (hFE) specifications
Package form factor (SOT-23-3, TO-236-3, SC-59, or equivalent small outline packages)

Substitutes are classified into two categories: direct replacements with identical or superior electrical ratings, and functional equivalents with reduced maximum collector current (500 mA vs. 800 mA) suitable for applications not requiring the full 800 mA capability.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Power mW	fT MHz	Package	Product Status	RoHS
BC817-40-7	Diodes Incorporated	800	45	310	100	SOT-23-3	Discontinued	Non-compliant
BC817-40-7-F	Diodes Incorporated	500	45	310	100	SOT-23-3	Active	ROHS3
BC817-16-TP	Micro Commercial Co	800	45	310	100	SOT-23-3	Active	ROHS3
BC817-16LT1G	onsemi	500	45	300	100	SOT-23-3	Active	ROHS3
BC817,215	Nexperia USA Inc.	500	45	250	100	TO-236AB	Active	ROHS3
BC817,235	Nexperia USA Inc.	500	45	250	100	TO-236AB	Active	ROHS3
BC817-16,215	Nexperia USA Inc.	500	45	250	100	TO-236AB	Active	ROHS3
BC817-16,235	Nexperia USA Inc.	500	45	250	100	TO-236AB	Active	ROHS3
2PD1820AR,115	Nexperia USA Inc.	500	50	200	150	SOT-323	Active	ROHS3
2PD1820AS,115	NXP USA Inc.	500	50	200	150	SOT-323	Active	ROHS3
2SC5876T106R	Rohm Semiconductor	500	60	200	300	UMT3	Not For New Designs	ROHS3

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Identical Electrical Ratings):

BC817-16-TP (Micro Commercial Co) provides direct electrical equivalence to BC817-40-7 with 800 mA maximum collector current, 45 V breakdown voltage, and 310 mW power rating in SOT-23-3 packaging. This part is Active status with ROHS3 compliance and maintains the full current capability of the original device.

Tier 2 - Functional Equivalent (Reduced Current Rating):

BC817-40-7-F (Diodes Incorporated) is the manufacturer's direct successor with reduced maximum collector current of 500 mA. This part maintains 45 V breakdown voltage, 310 mW power dissipation, and SOT-23-3 packaging. It is Active status with ROHS3 compliance and AEC-Q101 automotive qualification. Selection is appropriate for applications not requiring the full 800 mA capability.

BC817-16LT1G (onsemi) offers 500 mA maximum collector current, 45 V breakdown voltage, and 300 mW power rating in SOT-23-3 packaging. This part is Active status with ROHS3 compliance and provides wide availability.

Tier 3 - Package Variant Equivalents (TO-236AB):

BC817,215, BC817,235, BC817-16,215, and BC817-16,235 (Nexperia USA Inc.) are functionally equivalent with 500 mA maximum collector current and 45 V breakdown voltage. These parts use TO-236AB packaging (mechanically equivalent to SOT-23-3) and are Active status with ROHS3 compliance and AEC-Q101 automotive qualification.

Tier 4 - Enhanced Performance Alternatives (Higher Voltage/Frequency):

2PD1820AR,115 and 2PD1820AS,115 (Nexperia/NXP USA Inc.) provide 50 V breakdown voltage and 150 MHz transition frequency with 500 mA collector current in SOT-323 packaging. These parts are Active status with ROHS3 compliance and AEC-Q101 automotive qualification. Package change from SOT-23-3 to SOT-323 requires PCB layout modification.

2SC5876T106R (Rohm Semiconductor) offers 60 V breakdown voltage and 300 MHz transition frequency with 500 mA collector current in UMT3 packaging. This part is marked "Not For New Designs" and requires package layout change.

Frequently Asked Questions (FAQ)

Q: Can BC817-40-7-F be used as a direct replacement for BC817-40-7?

A: BC817-40-7-F is functionally equivalent with the same 45 V breakdown voltage, SOT-23-3 packaging, and 310 mW power rating. The maximum collector current is reduced from 800 mA to 500 mA. Substitution is valid for applications where collector current does not exceed 500 mA. Both parts share identical Vce saturation characteristics and DC current gain specifications.

Q: What is the difference between BC817-16-TP and BC817-40-7?

A: BC817-16-TP maintains identical electrical specifications to BC817-40-7, including 800 mA maximum collector current, 45 V breakdown voltage, and 310 mW power dissipation in SOT-23-3 packaging. The primary difference is manufacturer (Micro Commercial Co vs. Diodes Incorporated) and product status (Active vs. Discontinued). BC817-16-TP is ROHS3 compliant.

Q: Are the Nexperia BC817 variants in TO-236AB packaging compatible with SOT-23-3 footprints?

A: TO-236AB and SOT-23-3 are mechanically equivalent package designations for the same physical form factor. PCB footprints designed for SOT-23-3 accommodate TO-236AB packages without modification. Pin assignments and lead spacing are identical.

Q: Why do some substitutes have lower maximum power ratings (200-250 mW vs. 310 mW)?

A: Lower power ratings reflect different thermal characteristics and die designs across manufacturers. Substitutes with 200-250 mW ratings are suitable for applications where power dissipation remains within their specified limits. Thermal management and circuit design must account for the reduced power budget.

Q: Can 2PD1820AR,115 replace BC817-40-7 in existing designs?

A: 2PD1820AR,115 provides superior electrical performance with 50 V breakdown voltage and 150 MHz transition frequency. However, it uses SOT-323 packaging instead of SOT-23-3, requiring PCB layout modification. Electrical compatibility is confirmed for 500 mA maximum collector current applications.

Q: What is the significance of AEC-Q101 qualification on substitute parts?

A: AEC-Q101 qualification indicates the part meets automotive industry reliability and quality standards. Parts with this certification (BC817-40-7-F, Nexperia BC817 variants, 2PD1820 series) are suitable for automotive and high-reliability applications. The original BC817-40-7 lacks this certification.

Q: Is RoHS3 compliance required for BC817-40-7 substitution?

A: All active substitute parts listed are ROHS3 compliant. The original BC817-40-7 is RoHS non-compliant. For applications subject to RoHS regulations, substitution with compliant alternatives is mandatory. Compliance status does not affect electrical functionality.

Q: Why is 2SC5876T106R marked "Not For New Designs"?

A: Parts marked "Not For New Designs" are in end-of-life status and not recommended for new product development. While electrically functional, long-term availability is not guaranteed. Selection of active-status alternatives is preferred for new designs.

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