BDX54ATU Equivalent & Substitute Parts

Part Overview

The BDX54ATU is a PNP Darlington bipolar junction transistor manufactured by onsemi, rated for 60 V collector-emitter breakdown voltage and 8 A maximum collector current in a TO-220-3 through-hole package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The BDX54ATU delivers 60 W maximum power dissipation with a minimum DC current gain of 750 at 3 A collector current and 3 V collector-emitter voltage.

Key Parameters

Parameter	BDX54ATU Value
Transistor Type	PNP - Darlington
Current - Collector (Ic) (Max)	8 A
Voltage - Collector Emitter Breakdown (Max)	60 V
Power - Max	60 W
DC Current Gain (hFE) (Min) @ Ic, Vce	750 @ 3A, 3V
Vce Saturation (Max) @ Ib, Ic	2V @ 12mA, 3A
Current - Collector Cutoff (Max)	500µA
Operating Temperature (TJ)	150°C
Package / Case	TO-220-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the BDX54ATU are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor type: PNP - Darlington configuration
Collector-emitter breakdown voltage: 60 V (maximum rating)
Maximum collector current: 8 A or greater
Package type: TO-220-3 through-hole
Mounting compatibility: Through-hole configuration

Secondary Compatibility Parameters:

DC current gain (hFE): Minimum 750 at specified operating conditions
Vce saturation characteristics within acceptable operating range
Collector cutoff current: 500µA or lower
Operating temperature range: Support for 150°C junction temperature

The TIP105 and TIP125 transistors meet all primary substitution criteria and maintain electrical compatibility within the specified parameter ranges. Both devices are active products with higher inventory availability compared to the obsolete BDX54ATU.

Parameter Comparison

Parameter	BDX54ATU	TIP105	TIP125
Transistor Type	PNP - Darlington	PNP - Darlington	PNP - Darlington
Current - Collector (Ic) (Max)	8 A	8 A	Not specified
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	60 V
Power - Max	60 W	80 W	Not specified
DC Current Gain (hFE) (Min) @ Ic, Vce	750 @ 3A, 3V	1000 @ 3A, 4V	1000 @ 3A, 3V
Vce Saturation (Max) @ Ib, Ic	2V @ 12mA, 3A	2.5V @ 80mA, 8A	4V @ 20mA, 5A
Current - Collector Cutoff (Max)	500µA	50µA	500µA
Operating Temperature (TJ)	150°C	-65°C ~ 150°C	-65°C ~ 150°C
Package / Case	TO-220-3	TO-220-3	TO-220-3
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

TIP105 Substitution: The TIP105 is manufactured by NTE Electronics, Inc and maintains active product status. This device meets all electrical requirements of the BDX54ATU with identical maximum collector current (8 A) and collector-emitter breakdown voltage (60 V). The TIP105 provides higher maximum power dissipation (80 W versus 60 W) and superior DC current gain (1000 minimum versus 750 minimum). The TIP105 features lower collector cutoff current (50µA versus 500µA), resulting in reduced leakage characteristics. Operating temperature range extends to -65°C, providing broader environmental compatibility. The TIP105 is RoHS non-compliant.

TIP125 Substitution: The TIP125 is manufactured by NTE Electronics, Inc and maintains active product status. This device meets all electrical requirements of the BDX54ATU with identical collector-emitter breakdown voltage (60 V) and collector cutoff current (500µA). The TIP125 provides equivalent DC current gain (1000 minimum at 3A, 3V). Operating temperature range extends to -65°C, providing broader environmental compatibility. The TIP125 is RoHS non-compliant.

Both substitute parts are available in significantly higher inventory quantities (44,200 pcs for TIP105 and 31,145 pcs for TIP125) compared to the BDX54ATU (810 pcs). Both substitute devices are packaged in TO-220-3 through-hole configuration, ensuring direct mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the TIP105 directly replace the BDX54ATU in existing designs? A: Yes. The TIP105 maintains identical collector-emitter breakdown voltage (60 V), maximum collector current (8 A), and TO-220-3 package configuration. The TIP105 provides enhanced performance characteristics including higher power dissipation (80 W) and lower collector cutoff current (50µA).

Q: What are the key differences between TIP105 and TIP125 substitutes? A: The TIP105 provides 8 A maximum collector current and 80 W power dissipation with 50µA collector cutoff current. The TIP125 does not specify maximum collector current or power dissipation but maintains 500µA collector cutoff current matching the BDX54ATU. Both devices provide 1000 minimum DC current gain and 60 V collector-emitter breakdown voltage.

Q: Are the substitute parts mechanically compatible with BDX54ATU PCB layouts? A: Yes. Both TIP105 and TIP125 are packaged in TO-220-3 through-hole configuration, identical to the BDX54ATU. Direct pin-for-pin substitution is supported without PCB modification.

Q: What is the impact of higher DC current gain in substitute parts? A: The TIP105 and TIP125 provide minimum DC current gain of 1000 compared to 750 for the BDX54ATU. Higher current gain reduces base drive requirements and improves switching efficiency in circuit applications.

Q: Do the substitute parts support the same operating temperature range? A: The BDX54ATU supports maximum junction temperature of 150°C. Both TIP105 and TIP125 support extended operating temperature range from -65°C to 150°C, providing broader environmental compatibility.

Q: What compliance differences exist between the main part and substitutes? A: The BDX54ATU is REACH Unaffected. Both TIP105 and TIP125 are RoHS non-compliant. All three devices carry ECCN EAR99 classification.

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