BFS17,215 RF Transistor NPN Equivalent & Substitute Parts

Part Overview

The BFS17,215 is an RF transistor NPN manufactured by NXP USA Inc., designed for radio frequency applications operating at 1GHz transition frequency. This device is rated for 15V collector-emitter breakdown voltage with 25mA maximum collector current and 300mW power dissipation in a surface mount SOT-23 (TO-236AB) package.

The BFS17,215 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Substitute parts must maintain electrical compatibility within the RF transistor NPN category while meeting the mechanical and thermal constraints of the original application.

Key Parameters

Parameter	BFS17,215 Value	Unit	Substitution Relevance
Transistor Type	NPN	-	Critical - must match
Voltage - Collector Emitter Breakdown (Max)	15V	V	Critical - determines maximum operating voltage
Frequency - Transition	1GHz	GHz	Critical - defines RF performance capability
Power - Max	300mW	mW	Critical - thermal dissipation limit
Current - Collector (Ic) (Max)	25mA	mA	Critical - maximum current handling
DC Current Gain (hFE) (Min) @ Ic, Vce	25 @ 2mA, 1V	-	Important - amplification characteristics
Noise Figure (dB Typ @ f)	4.5dB @ 500MHz	dB	Important - signal quality parameter
Mounting Type	Surface Mount	-	Critical - PCB assembly compatibility
Package / Case	TO-236-3, SC-59, SOT-23-3	-	Critical - physical footprint and pinout
Operating Temperature	150°C (TJ)	°C	Important - thermal operating range
RoHS Status	ROHS3 Compliant	-	Regulatory - environmental compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-	Important - handling and storage requirements

Substitute Part Grouping Explanation

Substitution logic for the BFS17,215 is based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (mandatory match)
Package Type: Surface mount SOT-23 (TO-236AB) or compatible footprint
Voltage Rating: Collector-emitter breakdown voltage ≥ 15V
Current Rating: Collector current (Ic) ≥ 25mA
Power Dissipation: Maximum power ≥ 300mW
Frequency Performance: Transition frequency ≥ 1GHz for RF operation
Compliance: ROHS3 compliant, MSL 1 rating

Substitution Groups:

Group 1 - Direct Package Compatibility (SOT-23) Parts maintaining identical or pin-compatible SOT-23 packaging with equivalent or superior electrical ratings:

BFR35APE6327HTSA1
BFR92PE6327HTSA1
BFS 17P E8211

Group 2 - Enhanced Performance (Higher Frequency, Higher Power) Parts with improved RF characteristics and higher power handling, maintaining SOT-23 compatibility:

BFU520AR (10GHz, 450mW, 12V)

Group 3 - Alternative Package, Comparable Performance Parts with different surface mount packages but equivalent electrical specifications:

55GN01FA-TL-H (3-SSFP package, 5.5GHz, 250mW, 10V)
BFR193FH6327XTSA1 (PG-TSFP-3 package, 8GHz, 580mW, 12V)

Group 4 - High-Frequency Specialized Parts designed for higher frequency applications with reduced power ratings:

BF776H6327XTSA1 (46GHz, 200mW, 4.7V, SOT-343 package)

Group 5 - Higher Power, Chassis Mount Part designed for higher power applications with different mounting approach:

MAPRST0912-50 (50W, 65V, chassis mount)

Group 6 - Equivalent Performance, Different Manufacturer Parts from alternative manufacturers with matching specifications:

2SC5415AF-TD-E (onsemi, 6.7GHz, 800mW, 12V, PCP package)
CPH6001A-TL-E (onsemi, 6.7GHz, 800mW, 12V, SOT-23-6 package)

Parameter Comparison

Part Number	Manufacturer	Vce (Max) V	Ic (Max) mA	Frequency GHz	Power mW	Package	Status
BFS17,215	NXP USA Inc.	15	25	1	300	SOT-23	Obsolete
BFR35APE6327HTSA1	Infineon Technologies	15	45	5	280	SOT-23	Active
BFR92PE6327HTSA1	Infineon Technologies	15	45	5	280	SOT-23	Active
BFS 17P E8211	Infineon Technologies	15	25	1.4	280	SOT-23	Active
BFU520AR	NXP USA Inc.	12	30	10	450	SOT-23	Active
55GN01FA-TL-H	onsemi	10	70	5.5	250	3-SSFP	Active
BFR193FH6327XTSA1	Infineon Technologies	12	80	8	580	PG-TSFP-3	Active
BF776H6327XTSA1	Infineon Technologies	4.7	50	46	200	SOT-343	Active
2SC5415AF-TD-E	onsemi	12	100	6.7	800	PCP	Obsolete
CPH6001A-TL-E	onsemi	12	100	6.7	800	SOT-23-6	Active
MAPRST0912-50	MACOM Technology Solutions	65	5300	-	50000	Chassis Mount	Active

Engineering Selection Recommendations

For Direct Replacement (Same Package, Same Voltage Class):

BFS 17P E8211 (Infineon Technologies) is the primary direct substitute. This part maintains the 15V voltage rating, SOT-23 package compatibility, and 25mA collector current specification. The transition frequency is increased to 1.4GHz, providing improved RF performance. Product status is active, ensuring long-term availability. ROHS3 compliance and MSL 1 rating match the original specification.

BFR35APE6327HTSA1 and BFR92PE6327HTSA1 (both Infineon Technologies) are functionally equivalent alternatives in SOT-23 packaging. Both maintain 15V voltage rating with increased collector current (45mA) and power dissipation (280mW). Transition frequency is 5GHz, providing significant RF performance improvement. Both are active products with full compliance certifications.

For Enhanced RF Performance (Higher Frequency, Same Package):

BFU520AR (NXP USA Inc.) provides 10GHz transition frequency in SOT-23 packaging with 450mW power dissipation. Voltage rating is reduced to 12V and collector current is 30mA. This part is active and carries AEC-Q101 automotive qualification. Selection is appropriate for applications requiring higher frequency performance within 12V operating constraints.

For Alternative Package Applications:

55GN01FA-TL-H (onsemi) operates at 5.5GHz in 3-SSFP package with 10V voltage rating and 70mA collector current. This part is active and suitable for applications where package footprint differs from SOT-23.

BFR193FH6327XTSA1 (Infineon Technologies) provides 8GHz performance in PG-TSFP-3 package with 12V rating and 80mA collector current. Power dissipation is 580mW. This part is active and appropriate for higher power RF applications.

For Specialized High-Frequency Applications:

BF776H6327XTSA1 (Infineon Technologies) operates at 46GHz in SOT-343 package. Voltage rating is reduced to 4.7V with 50mA collector current and 200mW power dissipation. This part is active and designed for millimeter-wave frequency applications.

Compliance and Regulatory Considerations:

All recommended substitute parts maintain ROHS3 compliance and MSL 1 rating, matching the original BFS17,215 specification. All parts are classified as REACH unaffected and carry EAR99 ECCN designation. Selection should prioritize active product status to ensure supply chain continuity and technical support availability.

Frequently Asked Questions (FAQ)

Q1: Can BFS 17P E8211 be used as a direct replacement for BFS17,215?

A: Yes. BFS 17P E8211 maintains identical voltage rating (15V), collector current (25mA), and SOT-23 package compatibility. The transition frequency is increased from 1GHz to 1.4GHz, providing improved RF performance without circuit modification. Both parts are NPN transistors with ROHS3 compliance and MSL 1 rating.

Q2: What is the difference between BFR35APE6327HTSA1 and BFR92PE6327HTSA1?

A: Both parts are electrically identical with 15V voltage rating, 45mA collector current, 5GHz transition frequency, and 280mW power dissipation in SOT-23 packaging. The difference is in manufacturer part numbering and inventory availability. BFR92PE6327HTSA1 has significantly higher stock (305,200 pcs vs. 3,706 pcs).

Q3: Why is BFU520AR rated at 12V instead of 15V?

A: BFU520AR is designed for applications requiring higher frequency performance (10GHz vs. 1GHz). The reduced voltage rating reflects the design optimization for higher frequency operation. Selection requires verification that the application circuit operates within 12V maximum collector-emitter voltage.

Q4: Can MAPRST0912-50 replace BFS17,215?

A: No. MAPRST0912-50 is a chassis mount transistor rated for 65V and 5.3A collector current with 50W power dissipation. This part is designed for high-power applications and is not compatible with surface mount PCB assembly or the original circuit topology. Package type and electrical ratings are fundamentally different.

Q5: What is the significance of the SOT-343 package used in BF776H6327XTSA1?

A: SOT-343 is a smaller surface mount package compared to SOT-23. BF776H6327XTSA1 is optimized for millimeter-wave frequencies (46GHz) and operates at reduced voltage (4.7V). This part is suitable only for specialized high-frequency applications and requires PCB layout redesign due to package differences.

Q6: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts listed maintain ROHS3 compliance matching the original BFS17,215 specification. All parts also carry MSL 1 (unlimited moisture sensitivity level) rating and are REACH unaffected.

Q7: Which substitute part has the best RF performance?

A: BF776H6327XTSA1 operates at 46GHz transition frequency, providing the highest RF performance. However, this part requires 4.7V maximum voltage and SOT-343 package, making it suitable only for specialized millimeter-wave applications. For general RF applications maintaining 15V voltage compatibility, BFR35APE6327HTSA1 and BFR92PE6327HTSA1 provide 5GHz performance in standard SOT-23 packaging.

Q8: What is the difference between active and obsolete product status?

A: Active products are in current production with guaranteed long-term availability and manufacturer support. Obsolete products are no longer manufactured and have limited remaining inventory. BFS17,215 is obsolete; substitute parts should be selected from active product status to ensure supply chain continuity.

Q9: Can BFR193FH6327XTSA1 be used in place of BFS17,215 without circuit modification?

A: BFR193FH6327XTSA1 uses PG-TSFP-3 package instead of SOT-23, requiring PCB layout redesign. Voltage rating is 12V (vs. 15V), requiring circuit verification. Collector current is 80mA (vs. 25mA) and power dissipation is 580mW (vs. 300mW). Substitution requires engineering evaluation and PCB redesign.

Q10: Which substitute part offers the best balance of compatibility and performance?

A: BFS 17P E8211 (Infineon Technologies) offers the best direct compatibility with improved performance. It maintains 15V voltage rating, SOT-23 package, and 25mA collector current while increasing transition frequency to 1.4GHz. This part is active with full compliance certifications and requires no circuit modification for direct substitution.

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