BCX56 TR NPN Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The BCX56 TR is an NPN bipolar junction transistor manufactured by Central Semiconductor Corp, designed for surface mount applications in the SOT-89 package. This device operates at 80 V collector-emitter breakdown voltage with a maximum collector current of 1 A and transition frequency of 130 MHz. The BCX56 TR is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, saturation characteristics, and thermal operating range while accommodating variations in power dissipation and frequency response within acceptable design margins.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	80	V
Current - Collector (Ic) (Max)	1	A
Vce Saturation (Max) @ Ib, Ic	500 mV @ 50 mA, 500 mA	—
Current - Collector Cutoff (Max)	100	nA
Power - Max	1.3	W
Frequency - Transition	130	MHz
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-243AA	—
Supplier Device Package	SOT-89	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BCX56 TR is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Transistor Type: NPN (mandatory match)
Voltage - Collector Emitter Breakdown: 80 V (minimum requirement)
Current - Collector (Ic) (Max): 1 A (minimum requirement)
Vce Saturation: 500 mV @ 50 mA, 500 mA (mandatory match)
Current - Collector Cutoff (Max): 100 nA (maximum allowable)
Package / Case: TO-243AA (mandatory match)
Supplier Device Package: SOT-89 or SOT-89-3 (compatible variants)
Mounting Type: Surface Mount (mandatory match)
Moisture Sensitivity Level: 1 (Unlimited) (mandatory match)

Allowable Variation Parameters:

Power - Max: 500 mW to 2 W (substitutes may exceed original 1.3 W specification)
Frequency - Transition: 130 MHz to 180 MHz (substitutes may exceed original specification)
DC Current Gain (hFE): 40 to 100 @ 150 mA, 2 V (variation permitted within specified test conditions)
Operating Temperature Range: -65°C to 150°C (minimum requirement; substitutes meeting this range are acceptable)

All identified substitute parts maintain the mandatory electrical and mechanical parameters while offering active product status and enhanced compliance certifications (RoHS3, REACH Unaffected).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) A	Vce(br) V	Vce Sat mV	Power W	Freq MHz	hFE @ 150mA, 2V	Temp °C	Package	Status
BCX56 TR	Central Semiconductor Corp	1	80	500	1.3	130	100	-65 to 150	SOT-89	Obsolete
BCX56-TP	Micro Commercial Co	1	80	500	0.5	130	63	-40 to 150	SOT-89	Active
BCX56,115	Nexperia USA Inc.	1	80	500	1.25	180	63	-40 to 150	SOT-89	Active
BCX56,135	NXP USA Inc.	1	80	500	1.25	180	63	-40 to 150	SOT-89	Active
BCX56-10,115	Nexperia USA Inc.	1	80	500	1.25	180	63	-40 to 150	SOT-89	Active
BCX56-10,135	Nexperia USA Inc.	1	80	500	1.25	180	63	-40 to 150	SOT-89	Active
BCX56-16,115	Nexperia USA Inc.	1	80	500	1.25	180	100	-40 to 150	SOT-89	Active
BCX56-16,135	Nexperia USA Inc.	1	80	500	1.25	180	100	-40 to 150	SOT-89	Active
BCX56-16,147	Nexperia USA Inc.	1	80	500	1.25	180	100	-40 to 150	SOT-89	Active
BCX5616QTA	Diodes Incorporated	1	80	500	2	150	100	-65 to 150	SOT-89-3	Active
BCX56TA	Diodes Incorporated	1	80	500	1	150	40	-65 to 150	SOT-89-3	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

BCX56-16,115, BCX56-16,135, and BCX56-16,147 (all Nexperia USA Inc.) are the preferred substitutes. These parts maintain DC current gain (hFE) of 100 @ 150 mA, 2 V, matching the original BCX56 TR specification. All three are active products with RoHS3 compliance and REACH Unaffected status. The variants differ only in packaging configuration (Cut Tape & Digi-Reel® or Tape & Reel). Power dissipation is 1.25 W, exceeding the original 1.3 W specification, and transition frequency is 180 MHz, providing enhanced performance margin.

Secondary Substitutes (Acceptable with Design Verification):

BCX56,115 and BCX56,135 (Nexperia USA Inc. / NXP USA Inc.) are active alternatives with identical electrical specifications to the primary substitutes but lower inventory availability. BCX5616QTA (Diodes Incorporated) offers the highest power rating at 2 W and maintains the full operating temperature range (-65°C to 150°C) matching the original part. This device uses SOT-89-3 package variant and is suitable for applications requiring enhanced thermal performance.

Tertiary Substitutes (Limited Application):

BCX56-TP (Micro Commercial Co) and BCX56TA (Diodes Incorporated) are active products meeting all mandatory electrical parameters. BCX56-TP exhibits reduced power dissipation (500 mW) and lower DC current gain (63), suitable only for applications with relaxed gain requirements. BCX56TA provides lower DC current gain (40) and reduced power rating (1 W), limiting applicability to low-power signal switching circuits.

Compliance and Availability:

All substitute parts carry RoHS3 compliance and REACH Unaffected status. Nexperia variants demonstrate highest inventory levels (2,100 to 38,300 units), ensuring supply chain continuity. Diodes Incorporated variants (BCX5616QTA: 6,607 units; BCX56TA: 25,223 units) provide alternative sourcing with comparable availability.

Frequently Asked Questions (FAQ)

Q1: Can BCX56-TP replace BCX56 TR in all applications?

BCX56-TP maintains all mandatory electrical parameters (80 V Vce(br), 1 A Ic, 500 mV saturation voltage, SOT-89 package). However, power dissipation is reduced to 500 mW compared to the original 1.3 W specification. Applications operating at maximum power levels may require thermal design review. DC current gain is 63 versus the original 100, which may affect circuit biasing in gain-dependent designs.

Q2: What is the difference between BCX56,115 and BCX56-16,115?

Both parts are manufactured by Nexperia USA Inc. and share identical electrical specifications (80 V, 1 A, 1.25 W, 180 MHz). The primary difference is DC current gain: BCX56,115 specifies 63 @ 150 mA, 2 V, while BCX56-16,115 specifies 100 @ 150 mA, 2 V. For applications sensitive to transistor gain, BCX56-16,115 provides closer matching to the original BCX56 TR (100 hFE).

Q3: Why do some substitutes use SOT-89-3 package instead of SOT-89?

SOT-89-3 is a compatible variant of the TO-243AA case outline. Both packages maintain identical pin configuration and footprint compatibility for surface mount PCB assembly. The "-3" designation indicates a specific manufacturing variant. Substitutes using SOT-89-3 (BCX5616QTA, BCX56TA) are electrically and mechanically interchangeable with SOT-89 versions in standard applications.

Q4: Is BCX5616QTA suitable for high-temperature applications?

BCX5616QTA maintains the full operating temperature range of -65°C to 150°C, matching the original BCX56 TR specification. This part is suitable for applications requiring extended temperature performance. The 2 W power rating provides enhanced thermal margin in high-dissipation circuits.

Q5: What is the impact of transition frequency variation (130 MHz to 180 MHz) on circuit performance?

Substitutes with higher transition frequency (180 MHz) provide enhanced high-frequency performance and improved switching speed compared to the original 130 MHz specification. For applications operating below 130 MHz, this variation has no negative impact. For circuits designed to operate near the original 130 MHz limit, higher transition frequency provides additional performance margin and improved stability.

Q6: Are all substitute parts RoHS3 compliant?

All identified substitute parts carry RoHS3 compliance certification. The original BCX56 TR does not specify RoHS status. For applications requiring RoHS3 compliance, any of the listed substitutes are acceptable. Nexperia and Diodes Incorporated variants explicitly document REACH Unaffected status, confirming compliance with EU chemical regulations.

Q7: Which substitute offers the best balance of availability and performance?

BCX56-16,115 and BCX56-16,135 (Nexperia USA Inc.) provide optimal balance: DC current gain of 100 matches the original specification, inventory exceeds 2,100 units, active product status ensures long-term availability, and RoHS3/REACH compliance meets modern regulatory requirements. Transition frequency of 180 MHz and power rating of 1.25 W exceed original specifications, providing design margin.

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