BCX38CSTOB Equivalent & Substitute Parts

Part Overview

The BCX38CSTOB is a Bipolar (BJT) Transistor NPN - Darlington configuration manufactured by Diodes Incorporated. This through-hole component operates at 60 V maximum collector-emitter breakdown voltage with a maximum collector current of 800 mA and 1 W power dissipation capability. The device features an E-Line (TO-92 compatible) package for through-hole mounting applications.

The BCX38CSTOB is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and maintenance applications where this transistor is specified.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Darlington	—
Current - Collector (Ic) (Max)	800	mA
Voltage - Collector Emitter Breakdown (Max)	60	V
Vce Saturation (Max) @ Ib, Ic	1.25 @ 8mA, 800mA	V
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	10000 @ 500mA, 5V	—
Power - Max	1	W
Operating Temperature	-55 to 200	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	E-Line-3	—
Supplier Device Package	E-Line (TO-92 compatible)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—
REACH Status	REACH Unaffected	—

Substitute Part Grouping Explanation

Substitution of the BCX38CSTOB is determined by electrical and mechanical parameter equivalence. The following parameters establish substitution eligibility:

Electrical Parameters:

Transistor Type: NPN - Darlington configuration
Maximum Collector Current (Ic): 800 mA
Maximum Collector-Emitter Breakdown Voltage: 60 V
Saturation Voltage (Vce): 1.25 V @ 8mA, 800mA
Collector Cutoff Current (ICBO): 100 nA
DC Current Gain (hFE): 10000 minimum @ 500mA, 5V
Maximum Power Dissipation: 1 W
Operating Temperature Range: -55°C to 200°C (TJ)

Mechanical Parameters:

Mounting Type: Through Hole
Package Configuration: E-Line-3 (TO-92 compatible)

Compliance Parameters:

RoHS3 Compliance
REACH Unaffected Status
Moisture Sensitivity Level 1

Substitute parts must match all electrical specifications, maintain through-hole mounting compatibility with E-Line-3 package configuration, and satisfy the same regulatory compliance requirements.

Parameter Comparison

Parameter	BCX38CSTOB	BCX38CSTZ	Match
Manufacturer	Diodes Incorporated	Diodes Incorporated	Yes
Transistor Type	NPN - Darlington	NPN - Darlington	Yes
Current - Collector (Ic) (Max)	800 mA	800 mA	Yes
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	Yes
Vce Saturation (Max) @ Ib, Ic	1.25V @ 8mA, 800mA	1.25V @ 8mA, 800mA	Yes
Current - Collector Cutoff (Max)	100 nA	100 nA	Yes
DC Current Gain (hFE) (Min) @ Ic, Vce	10000 @ 500mA, 5V	10000 @ 500mA, 5V	Yes
Power - Max	1 W	1 W	Yes
Operating Temperature	-55°C ~ 200°C (TJ)	-55°C ~ 200°C (TJ)	Yes
Mounting Type	Through Hole	Through Hole	Yes
Package / Case	E-Line-3	E-Line-3	Yes
Supplier Device Package	E-Line (TO-92 compatible)	E-Line (TO-92 compatible)	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Yes
REACH Status	REACH Unaffected	REACH Unaffected	Yes
Product Status	Obsolete	Active	Different
Packaging Type	—	Cut Tape (CT)	Different

Engineering Selection Recommendations

The BCX38CSTZ is a direct electrical and mechanical equivalent to the BCX38CSTOB. Both components are manufactured by Diodes Incorporated and share identical electrical specifications across all rated parameters including collector current, breakdown voltage, saturation characteristics, current gain, power rating, and operating temperature range.

The BCX38CSTZ maintains the same E-Line-3 through-hole package configuration, ensuring mechanical compatibility with existing PCB designs and assembly processes. Both parts satisfy ROHS3 compliance and REACH unaffected status requirements.

The primary distinction between these parts is product status: the BCX38CSTOB is classified as obsolete, while the BCX38CSTZ is active. The BCX38CSTZ is supplied in Cut Tape (CT) packaging, whereas the BCX38CSTOB packaging type is not specified. For applications requiring the BCX38CSTOB, the BCX38CSTZ provides continued component availability with full electrical and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can BCX38CSTZ be used as a direct replacement for BCX38CSTOB?

A: Yes. The BCX38CSTZ is electrically and mechanically equivalent to the BCX38CSTOB. All electrical parameters, including collector current rating (800 mA), breakdown voltage (60 V), saturation voltage, current gain, and power dissipation (1 W), are identical. Both components use the E-Line-3 through-hole package configuration compatible with TO-92 footprints.

Q: What is the difference between BCX38CSTOB and BCX38CSTZ?

A: The components are electrically identical. The BCX38CSTOB is obsolete, while the BCX38CSTZ is active. The BCX38CSTZ is supplied in Cut Tape (CT) packaging format. Both meet ROHS3 compliance and REACH unaffected requirements.

Q: Are there any compatibility concerns when substituting BCX38CSTZ for BCX38CSTOB?

A: No compatibility concerns exist. The E-Line-3 package configuration is identical, ensuring direct PCB footprint compatibility. Electrical performance is equivalent across all operating conditions within the specified temperature range (-55°C to 200°C).

Q: Does the packaging format (Cut Tape) affect component performance?

A: No. Packaging format affects only handling, storage, and assembly logistics. The Cut Tape (CT) format of the BCX38CSTZ does not alter electrical performance or functional characteristics compared to the BCX38CSTOB.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the BCX38CSTOB and BCX38CSTZ are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the moisture sensitivity level for these components?

A: Both components have Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements.

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