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BCX54TA Equivalent & Substitute Parts
Part Overview
The BCX54TA is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for small-signal switching and amplification applications. This surface-mount device operates at 45 V collector-emitter breakdown voltage with a maximum collector current of 1 A and 1 W power dissipation. The part is Active status and RoHS3 compliant, making it suitable for modern electronic assemblies. Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and thermal performance within the SOT-89-3 package family.
Substiute Parts
Key Parameters
| Parameter | BCX54TA Value | Unit |
|---|---|---|
| Transistor Type | NPN | — |
| Voltage - Collector Emitter Breakdown (Max) | 45 | V |
| Current - Collector (Ic) (Max) | 1 | A |
| Power - Max | 1 | W |
| Frequency - Transition | 150 | MHz |
| Vce Saturation (Max) @ Ib, Ic | 500mV @ 50mA, 500mA | — |
| DC Current Gain (hFE) (Min) @ Ic, Vce | 40 @ 150mA, 2V | — |
| Current - Collector Cutoff (Max) | 100 | nA |
| Operating Temperature Range | -65 to 150 | °C |
| Package / Case | TO-243AA (SOT-89-3) | — |
| Mounting Type | Surface Mount | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts for the BCX54TA are grouped into two categories based on electrical parameter compatibility:
Category 1: Direct Electrical Equivalents (45 V Breakdown) Parts that maintain the 45 V collector-emitter breakdown voltage specification: BCX54,115; BCX54-10,115; BCX54-16,115; and BCX54-16,135. These parts share identical maximum collector current (1 A), saturation voltage, and cutoff current specifications. Differences exist in DC current gain (hFE) and transition frequency, with substitute parts offering equal or superior performance. All maintain the TO-243AA package and SOT-89 supplier device package.
Category 2: Higher Voltage Rated Alternatives (60 V Breakdown) Parts rated for 60 V collector-emitter breakdown: BCX55,115; BCX55-10,115; and BCX55-16,115. These provide enhanced voltage margin while maintaining 1 A maximum collector current and identical saturation characteristics. The increased voltage rating allows operation in higher-voltage circuit topologies without performance degradation.
Category 3: Alternative Performance Profiles Parts with modified electrical characteristics: BSR41,115 (60 V, 100 MHz transition frequency, different gain specification); PXT2222A,115 (40 V, 600 mA, 300 MHz, automotive qualified); and PXT4401,115 (40 V, 600 mA, 250 MHz, automotive qualified). These are suitable only when circuit requirements permit deviation from the primary specifications.
Substitution logic is based on the following key parameters:
- Collector-emitter breakdown voltage (VCEO)
- Maximum collector current (Ic)
- Power dissipation capability
- Saturation voltage characteristics
- Package compatibility (TO-243AA / SOT-89)
- Operating temperature range
- Compliance certifications
Parameter Comparison
| Part Number | Manufacturer | VCEO (Max) [V] | Ic (Max) [A] | Power (Max) [W] | fT [MHz] | hFE (Min) @ Ic, Vce | Vce Sat (Max) | Package |
|---|---|---|---|---|---|---|---|---|
| BCX54TA | Diodes Incorporated | 45 | 1 | 1 | 150 | 40 @ 150mA, 2V | 500mV @ 50mA, 500mA | SOT-89-3 |
| BCX54,115 | NXP Semiconductors | 45 | 1 | 1.25 | 180 | 63 @ 150mA, 2V | 500mV @ 50mA, 500mA | SOT-89 |
| BCX54-10,115 | Nexperia USA Inc. | 45 | 1 | 1.25 | 180 | 63 @ 150mA, 2V | 500mV @ 50mA, 500mA | SOT-89 |
| BCX54-16,115 | Nexperia USA Inc. | 45 | 1 | 1.25 | 180 | 100 @ 150mA, 2V | 500mV @ 50mA, 500mA | SOT-89 |
| BCX54-16,135 | Nexperia USA Inc. | 45 | 1 | 1.25 | 180 | 100 @ 150mA, 2V | 500mV @ 50mA, 500mA | SOT-89 |
| BCX55,115 | Nexperia USA Inc. | 60 | 1 | 1.35 | 180 | 63 @ 150mA, 2V | 500mV @ 50mA, 500mA | SOT-89 |
| BCX55-10,115 | NXP Semiconductors | 60 | 1 | 1.25 | 180 | 63 @ 150mA, 2V | 500mV @ 50mA, 500mA | SOT-89 |
| BCX55-16,115 | Nexperia USA Inc. | 60 | 1 | 1.25 | 180 | 100 @ 150mA, 2V | 500mV @ 50mA, 500mA | SOT-89 |
| BSR41,115 | Nexperia USA Inc. | 60 | 1 | 1.35 | 100 | 100 @ 100mA, 5V | 500mV @ 50mA, 500mA | SOT-89 |
| PXT2222A,115 | Nexperia USA Inc. | 40 | 0.6 | 1.1 | 300 | 100 @ 150mA, 10V | 1V @ 50mA, 500mA | SOT-89 |
| PXT4401,115 | NXP USA Inc. | 40 | 0.6 | 1.1 | 250 | 100 @ 150mA, 1V | 750mV @ 50mA, 500mA | SOT-89 |
Engineering Selection Recommendations
Primary Substitutes (Direct Replacement)
The BCX54,115, BCX54-10,115, BCX54-16,115, and BCX54-16,135 are direct electrical equivalents with identical voltage and current ratings. These parts are manufactured by Nexperia USA Inc. or NXP Semiconductors and are RoHS3 compliant. Selection among these four depends on packaging requirements: BCX54,115 is supplied in Bulk; BCX54-10,115 in Tape & Reel; BCX54-16,115 in Cut Tape & Digi-Reel; and BCX54-16,135 in Tape & Reel. All four offer improved transition frequency (180 MHz versus 150 MHz) and higher power dissipation capability (1.25 W versus 1 W), providing superior performance margins.
Secondary Substitutes (Enhanced Voltage Rating)
The BCX55,115, BCX55-10,115, and BCX55-16,115 provide 60 V collector-emitter breakdown voltage while maintaining 1 A maximum collector current and identical saturation characteristics. These parts are suitable for applications requiring higher voltage headroom. Selection follows the same packaging logic as the BCX54 variants. All are RoHS3 compliant and offer 180 MHz transition frequency.
Alternative Substitutes (Modified Specifications)
The BSR41,115 operates at 60 V with 100 MHz transition frequency and different gain specification (100 @ 100mA, 5V). This part is suitable only when circuit design accommodates the lower transition frequency.
The PXT2222A,115 and PXT4401,115 are automotive-qualified parts (AEC-Q100 and AEC-Q101 respectively) with reduced maximum collector current (600 mA) and lower voltage rating (40 V). These are suitable only for applications where the reduced current and voltage ratings are acceptable and automotive qualification is required.
All substitute parts maintain the TO-243AA package and SOT-89 supplier device package, ensuring mechanical compatibility with the BCX54TA footprint.
Frequently Asked Questions (FAQ)
Q: Can BCX54,115 directly replace BCX54TA in all applications?
A: Yes. The BCX54,115 maintains identical maximum collector current (1 A), collector-emitter breakdown voltage (45 V), and saturation voltage specifications. The substitute offers superior transition frequency (180 MHz versus 150 MHz) and higher power dissipation (1.25 W versus 1 W), providing enhanced performance margins. Both parts use the TO-243AA package and are RoHS3 compliant.
Q: What is the difference between BCX54-16,115 and BCX54-16,135?
A: Both parts are electrically identical with 45 V breakdown voltage, 1 A maximum collector current, and 100 minimum DC current gain. The difference is packaging: BCX54-16,115 is supplied in Cut Tape & Digi-Reel format, while BCX54-16,135 is supplied in Tape & Reel format. Selection depends on assembly line requirements.
Q: When should BCX55 variants be used instead of BCX54 variants?
A: BCX55 variants are suitable when circuit topology requires higher voltage margin. The 60 V collector-emitter breakdown voltage of BCX55 parts provides additional headroom compared to the 45 V rating of BCX54 parts. All other electrical characteristics remain compatible. BCX55 parts are suitable for drop-in replacement in applications where voltage stress is a concern.
Q: Are PXT2222A,115 and PXT4401,115 suitable replacements for BCX54TA?
A: These parts are not direct replacements. Both are rated for 40 V maximum collector-emitter breakdown voltage and 600 mA maximum collector current, compared to BCX54TA specifications of 45 V and 1 A. Use these parts only when circuit requirements permit reduced voltage and current ratings. Both parts carry automotive qualification (AEC-Q100 and AEC-Q101 respectively).
Q: What is the significance of the packaging codes in part numbers like BCX54-10,115 and BCX54-16,115?
A: The numeric codes indicate packaging format and tape specifications. BCX54-10,115 denotes Tape & Reel packaging; BCX54-16,115 denotes Cut Tape & Digi-Reel packaging; BCX54-16,135 denotes Tape & Reel with different reel specifications. All three are electrically identical and use the same SOT-89 package. Selection depends on assembly equipment compatibility and procurement requirements.
Q: Are all substitute parts RoHS3 compliant?
A: All primary and secondary substitute parts (BCX54 and BCX55 variants) are explicitly RoHS3 compliant. The automotive-qualified parts (PXT2222A,115 and PXT4401,115) are also RoHS3 compliant. Compliance status is documented in the part specifications.
Q: What is the operating temperature range for substitute parts?
A: All substitute parts operate across the -65°C to 150°C temperature range, matching the BCX54TA specification. This ensures thermal compatibility in applications with wide operating temperature requirements.
Q: Can BCX54TA be used in automotive applications?
A: The BCX54TA is not automotive qualified. For automotive applications requiring equivalent performance, use PXT2222A,115 (AEC-Q100 qualified) or PXT4401,115 (AEC-Q101 qualified), with the understanding that these parts have reduced current and voltage ratings.
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