BC817-40W/MIF Equivalent & Substitute Parts

Part Overview

The BC817-40W/MIF is an NPN bipolar junction transistor manufactured by Nexperia USA Inc. in SOT-323 surface mount packaging. This device is classified as obsolete, though 716 pieces remain in stock. The BC817-40W/MIF is rated for 45 V collector-emitter breakdown voltage, 500 mA maximum collector current, and 200 mW power dissipation. It meets automotive-grade specifications with AEC-Q101 qualification and operates at a transition frequency of 100 MHz.

Due to the obsolete product status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Active alternatives maintain identical or superior electrical and mechanical specifications while offering improved availability and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	500	mA
Vce Saturation (Max) @ Ib, Ic	700 mV @ 50 mA, 500 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	250 @ 100 mA, 1 V	—
Power - Max	200	mW
Frequency - Transition	100	MHz
Operating Temperature (TJ)	150	°C
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BC817-40W/MIF is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 45 V
Current - Collector (Ic) (Max): 500 mA
Vce Saturation (Max) @ Ib, Ic: 700 mV @ 50 mA, 500 mA
Current - Collector Cutoff (Max): 100 nA
DC Current Gain (hFE) (Min) @ Ic, Vce: 250 @ 100 mA, 1 V
Power - Max: 200 mW
Frequency - Transition: 100 MHz

Mechanical Equivalence Criteria:

Package / Case: SC-70, SOT-323
Mounting Type: Surface Mount
Supplier Device Package: SOT-323

Compliance Criteria:

Grade: Automotive
Qualification: AEC-Q101
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are classified into two categories:

Parametric Equivalents maintain all electrical and mechanical specifications with identical package form factors. These parts are direct replacements with no design modifications required.

Similar Parts maintain core electrical specifications but may differ in package type (SOT-23-3 versus SOT-323), power dissipation rating, or DC current gain specifications. These parts require PCB layout verification and thermal analysis before implementation.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce Breakdown (Max) V	Vce Sat (Max) mV	hFE (Min)	Power (Max) mW	Frequency MHz	Package	Grade	AEC-Q101
BC817-40W/MIF	Nexperia USA Inc.	Obsolete	500	45	700	250	200	100	SOT-323	Automotive	Yes
BC817-40W,115	Nexperia USA Inc.	Active	500	45	700	250	200	100	SOT-323	Automotive	Yes
BC817-40W,135	Nexperia USA Inc.	Active	500	45	700	250	200	100	SOT-323	Automotive	Yes
BC817-40W-QF	Nexperia USA Inc.	Active	500	45	700	250	200	100	SOT-323	Automotive	Yes
BC817-40W-QX	Nexperia USA Inc.	Active	500	45	700	250	200	100	SOT-323	Automotive	Yes
BC817-40W	Taiwan Semiconductor Corporation	Active	500	45	700	250	200	100	SOT-323	—	—
BC817-40W RFG	Taiwan Semiconductor Corporation	Active	500	45	700	250	200	100	SOT-323	—	—
GSBC817-40W	Good-Ark Semiconductor	Active	500	45	700	250	200	100	SOT-323	—	—
BC817-25-7-F	Diodes Incorporated	Active	500	45	700	160	310	100	SOT-23-3	Automotive	Yes
BC817-25W-7	Diodes Incorporated	Active	500	45	700	160	200	100	SOT-323	—	—
BC817-40-7-F	Diodes Incorporated	Active	500	45	700	250	310	100	SOT-23-3	Automotive	Yes

Engineering Selection Recommendations

Recommended Parametric Equivalents (Direct Replacement):

The following parts are active alternatives with complete electrical and mechanical equivalence to the BC817-40W/MIF:

BC817-40W,115 (Nexperia USA Inc., Active): Identical specifications with Cut Tape & Digi-Reel packaging. 69,677 units in stock. Automotive-grade with AEC-Q101 qualification.
BC817-40W,135 (Nexperia USA Inc., Active): Identical specifications with Cut Tape & Digi-Reel packaging. 198,259 units in stock. Automotive-grade with AEC-Q101 qualification.
BC817-40W-QF (Nexperia USA Inc., Active): Identical specifications with Tape & Reel packaging. 1,179 units in stock. Automotive-grade with AEC-Q101 qualification. Series designation BC817W-Q.
BC817-40W-QX (Nexperia USA Inc., Active): Identical specifications with Tape & Reel packaging. 15,785 units in stock. Automotive-grade with AEC-Q101 qualification. Series designation BC817W-Q.

Alternative Parametric Equivalents (Non-Automotive Grade):

BC817-40W (Taiwan Semiconductor Corporation, Active): Identical electrical and mechanical specifications. 605,200 units in stock. Operating temperature range -55°C to 150°C. No automotive grade or AEC-Q101 designation provided.
BC817-40W RFG (Taiwan Semiconductor Corporation, Active): Identical electrical and mechanical specifications with Tape & Reel packaging. 6,625 units in stock. Operating temperature range -55°C to 150°C. No automotive grade or AEC-Q101 designation provided.
GSBC817-40W (Good-Ark Semiconductor, Active): Identical electrical and mechanical specifications. 5,768 units in stock. Operating temperature range -55°C to 150°C. No automotive grade or AEC-Q101 designation provided.

Similar Parts (Package or Specification Variation):

BC817-40-7-F (Diodes Incorporated, Active): Automotive-grade with AEC-Q101 qualification. Maintains 500 mA, 45 V, 250 hFE specifications. Package is SOT-23-3 (not SOT-323). Power dissipation is 310 mW (higher than 200 mW). 20,300 units in stock. Requires PCB layout modification.
BC817-25-7-F (Diodes Incorporated, Active): Automotive-grade with AEC-Q101 qualification. Maintains 500 mA, 45 V specifications. DC current gain is 160 hFE (lower than 250 hFE). Package is SOT-23-3 (not SOT-323). Power dissipation is 310 mW (higher than 200 mW). 35,200 units in stock. Requires PCB layout modification and circuit analysis for gain tolerance.
BC817-25W-7 (Diodes Incorporated, Active): Maintains 500 mA, 45 V, 200 mW specifications in SOT-323 package. DC current gain is 160 hFE (lower than 250 hFE). 18,657 units in stock. No automotive grade or AEC-Q101 designation provided. Requires circuit analysis for gain tolerance.

Selection Criteria by Application:

For automotive applications requiring AEC-Q101 compliance, select from Nexperia USA Inc. parametric equivalents (BC817-40W,115, BC817-40W,135, BC817-40W-QF, BC817-40W-QX) or Diodes Incorporated similar parts (BC817-40-7-F, BC817-25-7-F).

For non-automotive applications with standard industrial requirements, Taiwan Semiconductor Corporation (BC817-40W, BC817-40W RFG) or Good-Ark Semiconductor (GSBC817-40W) alternatives provide identical specifications with extended availability.

For applications where package form factor is flexible, Diodes Incorporated SOT-23-3 variants (BC817-40-7-F, BC817-25-7-F) offer higher power dissipation capability (310 mW) at the cost of PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can BC817-40W,115 or BC817-40W,135 be used as direct replacements for BC817-40W/MIF?

A: Yes. Both parts are manufactured by Nexperia USA Inc. and maintain identical electrical specifications (500 mA, 45 V, 250 hFE, 200 mW, 100 MHz) and mechanical specifications (SOT-323 package). Both are active products with automotive-grade classification and AEC-Q101 qualification. The primary difference is packaging format: BC817-40W,115 and BC817-40W,135 are supplied in Cut Tape & Digi-Reel format, while BC817-40W/MIF was supplied in standard format. No circuit modifications are required.

Q: What is the difference between BC817-40W-QF and BC817-40W-QX?

A: Both parts are manufactured by Nexperia USA Inc. with identical electrical and mechanical specifications. Both are supplied in Tape & Reel packaging and belong to the BC817W-Q series. The primary difference is inventory availability: BC817-40W-QX has 15,785 units in stock compared to 1,179 units for BC817-40W-QF. Both are automotive-grade with AEC-Q101 qualification and are suitable for direct replacement of BC817-40W/MIF.

Q: Can Taiwan Semiconductor Corporation BC817-40W be used in automotive applications?

A: Taiwan Semiconductor Corporation BC817-40W maintains identical electrical specifications (500 mA, 45 V, 250 hFE, 200 mW, 100 MHz) and mechanical specifications (SOT-323 package) to BC817-40W/MIF. However, this part does not carry automotive-grade designation or AEC-Q101 qualification in the provided specifications. Use in automotive applications requires verification of compliance requirements for the specific application and confirmation of qualification status with the manufacturer.

Q: Why do Diodes Incorporated BC817-25-7-F and BC817-40-7-F use SOT-23-3 packaging instead of SOT-323?

A: SOT-23-3 and SOT-323 are both three-terminal surface mount packages with different physical dimensions and pin spacing. SOT-23-3 (also designated TO-236-3 or SC-59) is larger than SOT-323 (also designated SC-70). Diodes Incorporated offers these parts in the larger SOT-23-3 package, which provides higher power dissipation capability (310 mW versus 200 mW). Use of SOT-23-3 variants requires PCB layout modification and cannot be used as direct pin-compatible replacements.

Q: What is the significance of the DC current gain (hFE) difference between BC817-40W/MIF (250 hFE) and BC817-25-7-F (160 hFE)?

A: DC current gain (hFE) determines the amplification factor of the transistor. BC817-40W/MIF specifies a minimum hFE of 250 at 100 mA collector current and 1 V collector-emitter voltage. BC817-25-7-F specifies a minimum hFE of 160 at the same conditions. The lower hFE of BC817-25-7-F means it requires higher base current to achieve the same collector current. Circuits designed for 250 hFE may not function correctly with 160 hFE devices without circuit analysis and potential redesign of bias networks.

Q: Are all substitute parts RoHS3 compliant?

A: All parametric equivalent parts from Nexperia USA Inc. (BC817-40W,115, BC817-40W,135, BC817-40W-QF, BC817-40W-QX) are explicitly listed as ROHS3 Compliant. Similar parts from Diodes Incorporated (BC817-25-7-F, BC817-25W-7, BC817-40-7-F) are also ROHS3 Compliant. Taiwan Semiconductor Corporation (BC817-40W, BC817-40W RFG) and Good-Ark Semiconductor (GSBC817-40W) parts are ROHS3 Compliant. All substitute parts meet RoHS3 requirements.

Q: What is Moisture Sensitivity Level (MSL) and why is it important?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions (typically 30°C, 60% relative humidity) before soldering without risk of moisture-induced damage. MSL 1 (Unlimited) means the component has no moisture sensitivity restrictions and can be stored indefinitely under standard conditions without special drying procedures. All substitute parts listed carry MSL 1 (Unlimited) designation, matching the BC817-40W/MIF specification.

Q: Can GSBC817-40W from Good-Ark Semiconductor be used as a direct replacement?

A: Yes, for non-automotive applications. GSBC817-40W maintains identical electrical specifications (500 mA, 45 V, 250 hFE, 200 mW, 100 MHz) and mechanical specifications (SOT-323 package) to BC817-40W/MIF. However, GSBC817-40W does not carry automotive-grade designation or AEC-Q101 qualification. It is suitable for industrial and consumer applications where automotive compliance is not required. Operating temperature range is -55°C to 150°C.

Q: What packaging formats are available for substitute parts?

A: Substitute parts are available in three packaging formats: Cut Tape & Digi-Reel (CT), Tape & Reel (TR), and unspecified format. Cut Tape & Digi-Reel format is suitable for lower-volume production and manual assembly. Tape & Reel format is optimized for high-volume automated assembly. Selection of packaging format depends on production volume and assembly equipment capabilities. All formats maintain identical electrical and mechanical specifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message