AT-32033-TR1 RF Transistor NPN Equivalent & Substitute Parts

Part Overview

The AT-32033-TR1 is an RF Transistor NPN 5.5V manufactured by Broadcom Limited, designed for surface mount applications in the SOT-23 package. This component operates at 5.5V collector-emitter breakdown voltage with a maximum power dissipation of 200mW and collector current of 32mA. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The AT-32033-TR1 is RoHS non-compliant and carries an MSL rating of 1 (Unlimited).

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	5.5	V
Current - Collector (Ic) (Max)	32	mA
Power - Max	200	mW
Noise Figure (Typ @ f)	1–1.3	dB @ 900MHz
Gain	11–12.5	dB
DC Current Gain (hFE) (Min) @ Ic, Vce	70	@ 2mA, 2.7V
Operating Temperature (Max)	150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the AT-32033-TR1 is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (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) or higher
Mounting Type: Surface Mount preferred for direct replacement; Through Hole alternatives available for circuit redesign

Secondary Compatibility Factors:

Noise Figure and Gain characteristics for RF performance alignment
DC Current Gain (hFE) for biasing circuit compatibility
Package compatibility (SOT-23 preferred; alternative packages require PCB layout modification)

Substitute parts are grouped into two categories:

Category A - Direct Surface Mount Replacements (SOT-23 Compatible): Parts maintaining surface mount packaging with electrical parameters meeting or exceeding the AT-32033-TR1 specifications.

Category B - Enhanced Performance Alternatives: Parts with superior frequency response, power handling, or voltage ratings that provide functional equivalence with potential performance improvements.

Category C - Legacy Through-Hole Options: Parts with different mounting types suitable for applications permitting circuit board redesign.

Parameter Comparison

Part Number	Manufacturer	Vce (Max) [V]	Ic (Max) [mA]	Power (Max) [mW]	Frequency [GHz]	Noise Figure [dB]	hFE (Min)	Mounting Type	Package	Product Status
AT-32033-TR1	Broadcom Limited	5.5	32	200	—	1–1.3 @ 900MHz	70	Surface Mount	SOT-23	Obsolete
BFP420H6801XTSA1	Infineon Technologies	5	35	160	25	1.1 @ 1.8GHz	60	Surface Mount	SOT-343	Active
BFP720FESDH6327XTSA1	Infineon Technologies	4.7	30	100	45	0.5–1.3 @ 150MHz–10GHz	160	Surface Mount	4-TSFP	Active
BFP196E6327HTSA1	Infineon Technologies	12	150	700	7.5	1.3–2.3 @ 900MHz–1.8GHz	70	Surface Mount	SOT-143-4	Active
2SC5087R(TE85L,F)	Toshiba Semiconductor and Storage	12	80	150	8	1.1–2 @ 1GHz	120	Surface Mount	SMQ	Active
MMBTH10-TP	Micro Commercial Co	25	50	225	0.65	—	60	Surface Mount	SOT-23	Active
2N918 PBFREE	Central Semiconductor Corp	15	50	200	0.6	6 @ 60kHz	20	Through Hole	TO-72	Active
BFR840L3RHESDE6327XTSA1	Infineon Technologies	2.6	35	75	75	0.5 @ 450MHz	150	Surface Mount	TSLP-3	Active
JANTX2N5109	Microsemi Corporation	—	—	—	—	—	—	Through Hole	TO-39	Active

Engineering Selection Recommendations

For Direct Replacement (Minimum Circuit Modification):

The BFP420H6801XTSA1 (Infineon Technologies) provides the closest functional equivalence to the AT-32033-TR1. Both parts operate at approximately 5V collector-emitter breakdown voltage with comparable collector current ratings (35mA vs. 32mA). The BFP420H6801XTSA1 is ROHS3 compliant and carries active product status, ensuring long-term availability. The SOT-343 package requires PCB layout adjustment from the original SOT-23, but electrical performance remains compatible. This part is recommended for new designs and production continuity.

For Enhanced Performance Applications:

The BFP196E6327HTSA1 (Infineon Technologies) offers superior power handling (700mW vs. 200mW) and higher collector current capability (150mA vs. 32mA) with 12V breakdown voltage. This part is suitable for applications requiring increased headroom or higher output power. ROHS3 compliance and active status support long-term supply chain stability.

The BFP720FESDH6327XTSA1 (Infineon Technologies) delivers the highest frequency performance (45GHz) with excellent noise figure characteristics (0.5–1.3dB across 150MHz–10GHz). This part is appropriate for ultra-wideband RF applications. Note that the 4.7V breakdown voltage is slightly below the AT-32033-TR1 specification; circuit design review is required.

For Legacy Through-Hole Applications:

The 2N918 PBFREE (Central Semiconductor Corp) maintains 200mW power rating and 15V breakdown voltage with through-hole TO-72 packaging. This part is suitable only for applications permitting circuit board redesign. ROHS3 compliance is confirmed.

Compliance and Supply Chain Considerations:

All recommended active substitutes carry ROHS3 compliance and REACH unaffected status, supporting modern manufacturing and environmental requirements. The AT-32033-TR1 is RoHS non-compliant; migration to compliant alternatives is recommended for new production.

The JANTX2N5109 (Microsemi Corporation) carries incomplete electrical specifications in available documentation and is not recommended without full datasheet verification.

The BFR840L3RHESDE6327XTSA1 operates at 2.6V breakdown voltage, below the AT-32033-TR1 minimum specification, and is not suitable for direct substitution.

Frequently Asked Questions (FAQ)

Q1: Can the BFP420H6801XTSA1 directly replace the AT-32033-TR1 without circuit modification?

A: The BFP420H6801XTSA1 provides electrical equivalence with respect to voltage, current, and power specifications. However, the package differs (SOT-343 vs. SOT-23), requiring PCB layout modification. Biasing circuits may require adjustment due to different hFE characteristics (60 vs. 70). Functional replacement is confirmed; physical board redesign is necessary.

Q2: What is the primary reason the AT-32033-TR1 requires substitution?

A: The AT-32033-TR1 is classified as obsolete by the manufacturer. Substitute parts ensure design continuity and production availability. All recommended alternatives carry active product status.

Q3: Are there surface mount substitutes that maintain the SOT-23 package?

A: The MMBTH10-TP (Micro Commercial Co) is available in SOT-23 packaging with 25V breakdown voltage and 225mW power rating. This part exceeds AT-32033-TR1 specifications and is ROHS3 compliant. However, the 650MHz frequency rating is lower than the AT-32033-TR1 noise figure specification at 900MHz. Suitability depends on application frequency requirements.

Q4: Which substitute offers the best noise figure performance?

A: The BFR840L3RHESDE6327XTSA1 delivers 0.5dB noise figure at 450MHz, superior to the AT-32033-TR1 (1–1.3dB @ 900MHz). However, this part operates at 2.6V breakdown voltage, below the AT-32033-TR1 specification, and is not suitable for direct replacement in voltage-constrained applications.

Q5: What compliance certifications should I verify for production use?

A: All recommended active substitutes carry ROHS3 compliance and REACH unaffected status. The AT-32033-TR1 is RoHS non-compliant. For new production, migration to ROHS3-compliant alternatives is required to meet current manufacturing standards.

Q6: Can through-hole parts like the 2N918 PBFREE substitute for the AT-32033-TR1?

A: The 2N918 PBFREE provides electrical equivalence (200mW power, 15V breakdown, 50mA collector current). However, the TO-72 through-hole package requires complete circuit board redesign. This option is suitable only for applications permitting PCB layout modification.

Q7: How do I select between multiple substitute options?

A: Selection depends on three factors: (1) Package compatibility—SOT-23 preferred for minimal redesign; (2) Electrical headroom—higher voltage/current ratings provide design margin; (3) Frequency performance—noise figure and gain requirements at your operating frequency. Consult application-specific RF performance requirements before final selection.

Q8: Is the JANTX2N5109 a viable substitute?

A: The JANTX2N5109 carries incomplete electrical specifications in available documentation. Full datasheet verification is required before use. This part is not recommended without comprehensive parameter confirmation.

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