BFR520,235 RF Transistor NPN Equivalent & Substitute Parts

Part Overview

The BFR520,235 is an RF transistor NPN manufactured by NXP USA Inc., designed for high-frequency applications up to 9GHz with a maximum power dissipation of 300mW. This device is packaged in SOT-23 (TO-236AB) surface mount configuration and operates at a collector-emitter breakdown voltage of 15V with a maximum collector current of 70mA.

The BFR520,235 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 RF transistor specification.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	15V	V
Frequency - Transition	9GHz	GHz
Noise Figure (Typ @ f)	1.1dB ~ 2.1dB @ 900MHz	dB
Power - Max	300mW	mW
DC Current Gain (hFE) (Min) @ Ic, Vce	60 @ 20mA, 6V	—
Current - Collector (Ic) (Max)	70mA	mA
Operating Temperature (TJ)	175°C	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BFR520,235 is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (mandatory match)
Voltage - Collector Emitter Breakdown: minimum 15V (equal or higher acceptable)
Frequency - Transition: minimum 9GHz (equal or higher acceptable)
Power - Max: minimum 300mW (equal or higher acceptable)
Current - Collector (Ic) (Max): minimum 70mA (equal or higher acceptable)
Mounting Type: Surface Mount (mandatory match)
Package compatibility: SOT-23-3 or equivalent footprint

Secondary Compatibility Factors:

Operating Temperature: 150°C or higher acceptable
RoHS Compliance: ROHS3 Compliant preferred
Moisture Sensitivity Level: MSL 1 acceptable
DC Current Gain (hFE): 60 or higher acceptable

Substitute parts are grouped into two categories based on parameter alignment:

Category A - Direct Substitutes (Matching or Exceeding All Primary Parameters):

BFR183E6327HTSA1 (Infineon): 12V, 8GHz, 450mW, 65mA, SOT-23-3
BFR35APE6327HTSA1 (Infineon): 15V, 5GHz, 280mW, 45mA, SOT-23-3
BFR92PE6327HTSA1 (Infineon): 15V, 5GHz, 280mW, 45mA, SOT-23-3

Category B - Functional Alternatives (Exceeding Frequency or Power Requirements):

2SC5087R(TE85L,F) (Toshiba): 12V, 8GHz, 150mW, 80mA, SMQ
BFP183WH6327XTSA1 (Infineon): 12V, 8.5GHz, 450mW, 65mA, SOT-343-4
BFP196E6327HTSA1 (Infineon): 12V, 7.5GHz, 700mW, 150mA, SOT-143-4
BFR182E6327HTSA1 (Infineon): 12V, 8GHz, 250mW, 35mA, SOT-23-3
BFR93AE6327HTSA1 (Infineon): 12V, 6GHz, 300mW, 90mA, SOT-23-3
MCH4015-TL-H (onsemi): 12V, 10GHz, 450mW, 100mA, SOT-343F
MMBTH10-TP (Micro Commercial Co): 25V, 650MHz, 225mW, 50mA, SOT-23-3

Parameter Comparison

Part Number	Manufacturer	Vce (Max) [V]	Frequency [GHz]	Power [mW]	Ic (Max) [mA]	Package	Status
BFR520,235	NXP USA Inc.	15	9	300	70	SOT-23-3	Obsolete
BFR183E6327HTSA1	Infineon	12	8	450	65	SOT-23-3	Active
BFR35APE6327HTSA1	Infineon	15	5	280	45	SOT-23-3	Active
BFR92PE6327HTSA1	Infineon	15	5	280	45	SOT-23-3	Active
2SC5087R(TE85L,F)	Toshiba	12	8	150	80	SMQ	Active
BFP183WH6327XTSA1	Infineon	12	8.5	450	65	SOT-343-4	Active
BFP196E6327HTSA1	Infineon	12	7.5	700	150	SOT-143-4	Active
BFR182E6327HTSA1	Infineon	12	8	250	35	SOT-23-3	Active
BFR93AE6327HTSA1	Infineon	12	6	300	90	SOT-23-3	Active
MCH4015-TL-H	onsemi	12	10	450	100	SOT-343F	Active
MMBTH10-TP	Micro Commercial Co	25	0.65	225	50	SOT-23-3	Active

Engineering Selection Recommendations

For Direct Footprint Compatibility (SOT-23-3 Package):

BFR183E6327HTSA1 and BFR92PE6327HTSA1 maintain identical package geometry to the BFR520,235. BFR183E6327HTSA1 offers superior power handling (450mW vs. 300mW) and higher collector current capability (65mA vs. 70mA nominal). Both devices are ROHS3 Compliant with MSL 1 rating and Active product status, ensuring long-term supply availability.

BFR35APE6327HTSA1 and BFR92PE6327HTSA1 match the 15V collector-emitter breakdown voltage specification of the original part, providing voltage margin equivalence. These parts are suitable for applications where voltage rating is a critical design parameter.

For Enhanced Performance Requirements:

BFP183WH6327XTSA1 provides increased frequency capability (8.5GHz) and power dissipation (450mW) in a SOT-343-4 package, requiring PCB layout modification. This part is recommended for designs requiring higher frequency operation or thermal headroom.

BFP196E6327HTSA1 offers the highest power dissipation (700mW) and collector current (150mA) among available substitutes, suitable for applications requiring increased current handling or thermal performance. Package change to SOT-143-4 is required.

MCH4015-TL-H provides the highest frequency capability (10GHz) and is manufactured by onsemi with Active status. This part requires SOT-343F package accommodation and is suitable for applications operating at frequencies approaching 10GHz.

For Lower Frequency Applications:

BFR93AE6327HTSA1 operates at 6GHz with 300mW power rating and 90mA collector current in SOT-23-3 package. This part is suitable for applications where 9GHz frequency capability is not required.

For Cost-Optimized Designs:

MMBTH10-TP operates at 650MHz with 25V collector-emitter breakdown voltage and is available in high inventory quantities. This part is suitable only for applications operating below 1GHz and does not meet the 9GHz frequency requirement of the original specification.

Compliance and Supply Status:

All recommended active substitutes maintain ROHS3 Compliance and MSL 1 rating. Infineon parts (BFR183E6327HTSA1, BFR35APE6327HTSA1, BFR92PE6327HTSA1, BFP183WH6327XTSA1, BFP196E6327HTSA1, BFR182E6327HTSA1, BFR93AE6327HTSA1) demonstrate the highest inventory availability and longest product lifecycle support.

Frequently Asked Questions (FAQ)

Q1: Can BFR183E6327HTSA1 directly replace BFR520,235 without PCB modification?

A: Yes. BFR183E6327HTSA1 is packaged in SOT-23-3, identical to the BFR520,235 footprint. Pin configuration and mechanical dimensions are compatible. However, electrical performance differs: BFR183E6327HTSA1 operates at 12V maximum (vs. 15V) and 8GHz (vs. 9GHz). Circuit validation is required to confirm performance adequacy for your specific application.

Q2: What is the primary limitation of 2SC5087R(TE85L,F) as a substitute?

A: 2SC5087R(TE85L,F) is packaged in SMQ, not SOT-23-3. PCB layout redesign is required. Additionally, maximum power dissipation is 150mW, significantly lower than the BFR520,235 specification of 300mW. This part is suitable only for applications with reduced power requirements.

Q3: Why does MMBTH10-TP appear in the substitute list if it operates at only 650MHz?

A: MMBTH10-TP is included as a functional alternative for applications where frequency requirements are lower than 9GHz. This part is not suitable for RF applications requiring 9GHz operation. Selection of MMBTH10-TP requires confirmation that your application does not require the 9GHz frequency capability of the original BFR520,235.

Q4: Which substitute offers the best frequency performance?

A: MCH4015-TL-H provides the highest frequency capability at 10GHz, exceeding the BFR520,235 specification of 9GHz. This part is manufactured by onsemi and is available in Active status. Package change to SOT-343F is required, necessitating PCB layout modification.

Q5: Are all substitute parts RoHS compliant?

A: All active substitute parts listed are ROHS3 Compliant. The BFR520,235 is also ROHS3 Compliant. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating, suitable for standard storage and handling conditions.

Q6: What is the voltage rating consideration when selecting a substitute?

A: The BFR520,235 operates at 15V maximum collector-emitter breakdown voltage. Most active substitutes operate at 12V maximum. BFR35APE6327HTSA1 and BFR92PE6327HTSA1 match the 15V rating. MMBTH10-TP operates at 25V. Selection depends on your circuit's voltage requirements: if your design operates above 12V, select parts with 15V or higher rating.

Q7: Which substitute provides the closest electrical match to BFR520,235?

A: BFR183E6327HTSA1 provides the closest match in frequency (8GHz vs. 9GHz), power dissipation (450mW vs. 300mW), and package (SOT-23-3). The primary difference is the 12V vs. 15V collector-emitter breakdown voltage. This part is recommended for applications where the 12V rating is acceptable and frequency operation below 9GHz is sufficient.

Q8: Can I use BFP196E6327HTSA1 in place of BFR520,235?

A: BFP196E6327HTSA1 offers superior electrical performance (7.5GHz, 700mW, 150mA) but requires package change from SOT-23-3 to SOT-143-4 (TO-253-4). PCB layout redesign is mandatory. This substitution is suitable only for designs where package change is feasible and the lower frequency (7.5GHz vs. 9GHz) is acceptable.

Q9: What inventory status should I consider when selecting a substitute?

A: BFR92PE6327HTSA1 has the highest inventory availability (305,200 pcs), followed by BFP183WH6327XTSA1 (15,266 pcs) and BFP196E6327HTSA1 (14,287 pcs). High inventory availability ensures supply continuity and reduces lead time risk for production requirements.

Q10: Are there any REACH or ECCN restrictions on substitute parts?

A: All substitute parts listed carry REACH Unaffected status and EAR99 ECCN classification, identical to the BFR520,235. No additional regulatory restrictions apply to substitution. HTSUS codes vary by part but remain within the 8541.21 range for semiconductor transistors.

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