AT-32011-TR1 Equivalent & Substitute Parts Reference

Part Overview

The AT-32011-TR1 is an RF transistor NPN manufactured by Broadcom Limited, designed for 5.5V applications with 32mA collector current and 200mW power dissipation in a surface mount SOT-143 package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates at 900MHz with noise figure specifications of 1dB to 1.3dB and gain characteristics of 12.5dB to 14dB, positioning it for RF signal amplification in low-power applications.

Key Parameters

Parameter	AT-32011-TR1 Value
Manufacturer	Broadcom Limited
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	5.5V
Current - Collector (Ic) (Max)	32mA
Power - Max	200mW
Noise Figure (dB Typ @ f)	1dB ~ 1.3dB @ 900MHz
Gain	12.5dB ~ 14dB
DC Current Gain (hFE) (Min) @ Ic, Vce	70 @ 2mA, 2.7V
Operating Temperature	150°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-253-4, TO-253AA (SOT-143)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the AT-32011-TR1 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (mandatory match)
Mounting Type: Surface Mount (mandatory match)
Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 5.5V
Current - Collector (Ic) (Max): Must equal or exceed 32mA
Power - Max: Must equal or exceed 200mW
Operating Temperature: Must support 150°C (TJ)
Noise Figure and Gain: Must fall within or be superior to specified ranges at comparable frequencies

Substitute Parts Identified:

BFP183WH6327XTSA1 (Infineon Technologies) - Active status, higher voltage rating (12V), increased power (450mW), superior gain (22dB), RoHS3 compliant
BFP540FESDH6327XTSA1 (Infineon Technologies) - Active status, voltage-matched (5V), higher frequency capability (30GHz), reduced power (250mW), RoHS3 compliant
BFP843H6327XTSA1 (Infineon Technologies) - Active status, lower voltage rating (2.25V), reduced power (125mW), higher hFE (150), RoHS3 compliant
BFR340FH6327XTSA1 (Infineon Technologies) - Active status, higher voltage (9V), higher frequency (14GHz), reduced power (75mW), RoHS3 compliant
BFS17NTA (Diodes Incorporated) - Active status, higher voltage (11V), higher frequency (3.2GHz), higher power (330mW), RoHS3 compliant
KSP10BU (Fairchild Semiconductor) - Active status, through-hole package (different mounting), higher voltage (25V), lower frequency (650MHz), RoHS status not specified

Parameter Comparison

Parameter	AT-32011-TR1	BFP183WH6327XTSA1	BFP540FESDH6327XTSA1	BFP843H6327XTSA1	BFR340FH6327XTSA1	BFS17NTA
Manufacturer	Broadcom Limited	Infineon Technologies	Infineon Technologies	Infineon Technologies	Infineon Technologies	Diodes Incorporated
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	5.5V	12V	5V	2.25V	9V	11V
Current - Collector (Ic) (Max)	32mA	65mA	80mA	55mA	20mA	50mA
Power - Max	200mW	450mW	250mW	125mW	75mW	330mW
Noise Figure (dB Typ @ f)	1dB ~ 1.3dB @ 900MHz	0.9dB ~ 1.4dB @ 900MHz ~ 1.8GHz	0.9dB ~ 1.4dB @ 1.8GHz	0.9dB ~ 1.85dB @ 450MHz ~ 10GHz	0.9dB ~ 1.2dB @ 100MHz ~ 2.4GHz	Not specified
Gain	12.5dB ~ 14dB	22dB	20dB	13.5dB ~ 24.5dB	13dB ~ 28dB	Not specified
DC Current Gain (hFE) (Min) @ Ic, Vce	70 @ 2mA, 2.7V	70 @ 15mA, 8V	50 @ 20mA, 3.5V	150 @ 15mA, 1.8V	90 @ 5mA, 3V	56 @ 5mA, 10V
Operating Temperature	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-253-4, SOT-143	SC-82A, SOT-343	4-SMD, Flat Leads	SC-82A, SOT-343	SOT-723	TO-236-3, SOT-23-3
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitution Candidates:

BFP540FESDH6327XTSA1 is the closest electrical match for voltage-constrained applications. It maintains the 5V collector-emitter breakdown specification, exceeds current and power requirements (80mA, 250mW), and provides superior frequency performance (30GHz). Active product status and ROHS3 compliance support long-term availability and regulatory requirements.

BFP183WH6327XTSA1 is suitable for applications where higher voltage headroom (12V) is acceptable. It provides the highest power dissipation capability (450mW) and superior gain (22dB), with active status and ROHS3 compliance ensuring production continuity.

BFR340FH6327XTSA1 serves applications requiring moderate voltage (9V) and high-frequency performance (14GHz). Reduced power rating (75mW) and collector current (20mA) limit applicability to lower-power RF stages. Active status and ROHS3 compliance are confirmed.

BFS17NTA offers high voltage capability (11V) and power dissipation (330mW) with moderate frequency performance (3.2GHz). Active status and ROHS3 compliance are confirmed. Noise figure and gain specifications are not provided, requiring design verification.

BFP843H6327XTSA1 is not recommended as a direct substitute due to insufficient voltage rating (2.25V), which falls below the AT-32011-TR1 specification of 5.5V.

Regulatory Compliance: All active substitute parts are ROHS3 compliant, addressing the non-compliance status of the obsolete AT-32011-TR1. This compliance is mandatory for new designs and production transitions.

Frequently Asked Questions (FAQ)

Q: Can BFP843H6327XTSA1 replace AT-32011-TR1 in my design?

A: No. The BFP843H6327XTSA1 has a maximum collector-emitter breakdown voltage of 2.25V, which is insufficient for the AT-32011-TR1 specification of 5.5V. Using this part would result in device failure under normal operating conditions.

Q: What is the primary difference between BFP540FESDH6327XTSA1 and BFP183WH6327XTSA1?

A: BFP540FESDH6327XTSA1 maintains voltage compatibility (5V) with the original part and offers superior frequency performance (30GHz). BFP183WH6327XTSA1 provides higher voltage rating (12V) and power capability (450mW) but requires circuit redesign if voltage headroom is limited. Selection depends on application frequency requirements and available supply voltage.

Q: Are all substitute parts surface mount?

A: Five of the six identified substitutes are surface mount devices. KSP10BU is a through-hole TO-92-3 package and requires different PCB layout and assembly processes. For surface mount production, KSP10BU is not recommended.

Q: Why is the AT-32011-TR1 listed as obsolete?

A: Broadcom Limited has discontinued this part. Substitute parts from active manufacturers (Infineon Technologies and Diodes Incorporated) ensure design continuity and long-term supply availability.

Q: Do all substitute parts meet RoHS compliance?

A: All active substitute parts identified are ROHS3 compliant. The original AT-32011-TR1 is RoHS non-compliant. Transition to any substitute part improves regulatory compliance for new production.

Q: What package considerations apply when selecting a substitute?

A: The AT-32011-TR1 uses SOT-143 (TO-253-4) packaging. Substitute parts use different packages: BFP183WH6327XTSA1 and BFP843H6327XTSA1 use SOT-343, BFP540FESDH6327XTSA1 uses 4-TSFP, BFR340FH6327XTSA1 uses SOT-723, and BFS17NTA uses SOT-23-3. PCB layout modifications are required for each substitute.

Q: Which substitute offers the best noise figure performance?

A: BFR340FH6327XTSA1 and BFP540FESDH6327XTSA1 both specify noise figure of 0.9dB minimum, which is superior to the AT-32011-TR1 specification of 1dB. BFP183WH6327XTSA1 also meets this performance level. BFS17NTA does not provide noise figure specifications.

Q: Can I use BFS17NTA if noise figure and gain specifications are not provided?

A: BFS17NTA specifications do not include noise figure or gain values. Design verification through testing or manufacturer consultation is necessary before implementation in noise-critical applications.

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