DCX51-13 Equivalent & Substitute Parts

Part Overview

The DCX51-13 is a PNP bipolar junction transistor manufactured by Diodes Incorporated, rated for 45 V collector-emitter breakdown voltage and 1 A maximum collector current in a surface mount SOT-89-3 package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical compatibility within the specified parameter ranges while offering active product status and continued availability.

Key Parameters

Parameter	DCX51-13 Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	1	A
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max) @ Ib, Ic	500 mV @ 50 mA, 500 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	63 @ 150 mA, 2 V	—
Power - Max	1	W
Frequency - Transition	200	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-243AA	—
Supplier Device Package	SOT-89-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the DCX51-13 are classified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Parameters (Must Match or Exceed):

Transistor Type: PNP (polarity-dependent; NPN variants are not interchangeable)
Current - Collector (Ic) Max: 1 A minimum
Voltage - Collector Emitter Breakdown: 45 V minimum
Vce Saturation: 500 mV @ 50 mA, 500 mA
Current - Collector Cutoff: 100 nA maximum
Package / Case: TO-243AA (SOT-89-3 compatible)
Mounting Type: Surface Mount

Secondary Parameters (Acceptable Variation):

DC Current Gain (hFE): 40 minimum (DCX51-13 specifies 63 minimum; lower values acceptable)
Frequency - Transition: 145 MHz minimum (DCX51-13 specifies 200 MHz; lower values acceptable for non-critical RF applications)
Power - Max: 500 mW minimum (DCX51-13 specifies 1 W; lower values acceptable if thermal design permits)
Operating Temperature Range: -55°C minimum, 150°C maximum (extended ranges acceptable)

Compliance Parameters:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts meeting these criteria are grouped into two categories: direct Diodes Incorporated equivalents (BCX5110TA, BCX51TA) and cross-manufacturer alternatives (Nexperia/NXP variants). All listed substitutes maintain the same package footprint and electrical interface.

Parameter Comparison

Parameter	DCX51-13	BCX5110TA	BCX5316TA	BCX51TA	BCX51,115 (NXP)	BCX51-10,115 (Nexperia)	BCX51-10F (Nexperia)
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Ic Max (A)	1	1	1	1	1	1	1
Vce Breakdown (V)	45	45	80	45	45	45	45
Vce Saturation (mV)	500	500	500	500	500	500	500
ICBO Max (nA)	100	100	100	100	100	100	100
hFE Min @ 150 mA, 2V	63	63	100	40	63	63	63
Power Max (W)	1	1	1	1	1.3	1.3	0.5
Frequency - Transition (MHz)	200	150	150	150	145	145	145
Operating Temp Range (°C)	-55 to 150	-65 to 150	-65 to 150	-65 to 150	to 150	to 150	to 150
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA
Supplier Device Package	SOT-89-3	SOT-89-3	SOT-89-3	SOT-89-3	SOT-89	SOT-89	SOT-89
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: BCX5110TA (Diodes Incorporated)

The BCX5110TA is the direct Diodes Incorporated equivalent to the DCX51-13. It maintains identical electrical specifications for collector current (1 A), collector-emitter breakdown voltage (45 V), saturation voltage, and cutoff current. The part is active with ROHS3 compliance and unlimited moisture sensitivity rating. The transition frequency is reduced from 200 MHz to 150 MHz; this reduction is acceptable for applications not requiring the full bandwidth of the original part. Extended operating temperature range (-65°C to 150°C) provides additional thermal margin. Packaging is Tape & Reel format with 25,200 units in stock.

Secondary Recommendation: BCX51TA (Diodes Incorporated)

The BCX51TA is a manufacturer-recommended substitute from Diodes Incorporated. It meets all critical electrical parameters with identical collector current, breakdown voltage, and saturation characteristics. The DC current gain minimum is reduced to 40 (from 63), which is acceptable for linear amplification and switching applications where gain margin exists. Transition frequency is 150 MHz. This part is active with ROHS3 compliance and limited inventory (2,268 units).

Alternative Recommendation: BCX5316TA (Diodes Incorporated)

The BCX5316TA provides enhanced voltage rating (80 V versus 45 V) while maintaining 1 A collector current and identical saturation characteristics. This part is suitable for applications requiring higher voltage headroom. The DC current gain is increased to 100 minimum, providing additional gain margin. Transition frequency is 150 MHz. The part is active with ROHS3 compliance and highest inventory availability (72,100 units).

Cross-Manufacturer Alternatives: Nexperia/NXP BCX51 Series

The BCX51,115, BCX51-10,115, and BCX51-10F variants from Nexperia/NXP maintain electrical compatibility with identical collector current, breakdown voltage, and saturation specifications. These parts feature transition frequencies of 145 MHz and power ratings of 1.3 W (BCX51,115 and BCX51-10,115) or 500 mW (BCX51-10F). The BCX51-10,115 variant includes AEC-Q100 automotive qualification. All Nexperia variants are active with ROHS3 compliance. Selection among these variants depends on packaging format (Bulk, Tape & Reel, or Cut Tape) and automotive qualification requirements.

Not Recommended: BCX54 Series (NPN Variants)

The BCX54,115, BCX54-10,115, BCX54-16,115, and BCX54-16,135 are NPN transistors and are not interchangeable with the PNP DCX51-13 without circuit redesign. These parts are listed in the source data but do not constitute valid substitutes for PNP applications.

Frequently Asked Questions (FAQ)

Q: Can I use BCX5316TA as a direct replacement for DCX51-13?

A: Yes. The BCX5316TA meets all critical electrical parameters: 1 A collector current, 500 mV saturation voltage, and 100 nA cutoff current. The 80 V breakdown voltage exceeds the 45 V requirement, providing additional voltage margin. The reduced transition frequency (150 MHz versus 200 MHz) is acceptable for applications not requiring the full bandwidth. Footprint and package are identical (TO-243AA, SOT-89-3).

Q: What is the difference between BCX51TA and BCX5110TA?

A: Both are Diodes Incorporated PNP transistors with identical collector current (1 A), breakdown voltage (45 V), and saturation characteristics. The primary difference is DC current gain: BCX5110TA specifies 63 minimum (matching DCX51-13), while BCX51TA specifies 40 minimum. For applications requiring higher gain, BCX5110TA is preferred. Both have 150 MHz transition frequency and extended operating temperature range (-65°C to 150°C).

Q: Are Nexperia BCX51 variants compatible with the DCX51-13?

A: Yes. The Nexperia BCX51,115, BCX51-10,115, and BCX51-10F maintain electrical compatibility with identical collector current, breakdown voltage, and saturation voltage. All are PNP transistors in TO-243AA packages. Differences include transition frequency (145 MHz versus 200 MHz), power rating (1.3 W or 500 mW versus 1 W), and packaging format. The BCX51-10,115 includes AEC-Q100 automotive qualification.

Q: Why is transition frequency lower in substitute parts?

A: The DCX51-13 specifies 200 MHz transition frequency, while most active substitutes specify 145–150 MHz. This reduction reflects current manufacturing processes and is acceptable for applications not requiring the full bandwidth. For switching applications and low-frequency amplification, the reduced frequency has no functional impact. For RF or high-frequency applications, verify that 145–150 MHz meets circuit requirements.

Q: What packaging formats are available for substitutes?

A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and Bulk. BCX5110TA is supplied in Tape & Reel format. BCX5316TA is supplied in Cut Tape & Digi-Reel format. Nexperia variants are available in Bulk (BCX51,115), Tape & Reel (BCX51-10,115, BCX51-10F), and Cut Tape formats (BCX54-16,115). Select packaging based on procurement and assembly requirements.

Q: Is the BCX51-10F suitable for high-power applications?

A: No. The BCX51-10F is rated for 500 mW maximum power, compared to 1 W for the DCX51-13. This part is suitable only for applications where thermal dissipation is limited to 500 mW. For applications requiring the full 1 W power rating, select BCX5110TA, BCX51TA, BCX5316TA, or the higher-power Nexperia variants (BCX51,115 or BCX51-10,115 at 1.3 W).

Q: Do all substitutes have the same moisture sensitivity rating?

A: Yes. All listed substitute parts have Moisture Sensitivity Level 1 (Unlimited), matching the DCX51-13. This rating indicates no moisture sensitivity precautions are required during storage or handling.

Q: Are all substitutes RoHS3 compliant?

A: All Diodes Incorporated and Nexperia substitutes listed are ROHS3 compliant. The NXP BCX51,115 does not specify RoHS status in the provided data. For applications requiring RoHS3 compliance, select from Diodes Incorporated (BCX5110TA, BCX51TA, BCX5316TA) or Nexperia (BCX51-10,115, BCX51-10F) variants.

Q: Can I use BCX54 series as a substitute?

A: No. The BCX54 series consists of NPN transistors, while the DCX51-13 is a PNP transistor. These are not interchangeable without complete circuit redesign. The BCX54 variants are listed in the source data for reference only and do not constitute valid substitutes.

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