BD1396S Equivalent & Substitute Parts

Part Overview

The BD1396S is an NPN bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 1.5 A maximum collector current in a TO-126-3 through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The BD1396S serves general-purpose switching and amplification applications requiring moderate current and voltage ratings.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	80 V
Current - Collector (Ic) (Max)	1.5 A
Power - Max	1.25 W
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 150mA, 2V
Operating Temperature (Max)	150°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-225AA, TO-126-3

Substitute Part Grouping Explanation

Substitution of the BD1396S is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor Type: NPN (required match)
Voltage - Collector Emitter Breakdown: 80 V (minimum requirement)
Current - Collector (Ic) (Max): 1.5 A (minimum requirement)
Vce Saturation: 500mV @ 50mA, 500mA (required match)
Current - Collector Cutoff (ICBO): 100nA (required match)
DC Current Gain (hFE): 40 @ 150mA, 2V (required match)

Mechanical Compatibility Criteria:

Mounting Type: Through Hole (required match)
Package / Case: TO-225AA, TO-126-3 (required match)

Substitute parts are grouped into two categories:

Direct Equivalents: Parts meeting all electrical and mechanical parameters with identical or superior power ratings and active product status.

Similar Alternatives: Parts meeting core electrical parameters but with variations in power rating, current rating, or frequency characteristics that may require circuit evaluation.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max)	Vce (Breakdown)	Power (Max)	Vce Sat @ Ib, Ic	hFE (Min) @ Ic, Vce	ICBO (Max)	Package	Mounting
BD1396S	onsemi	Obsolete	1.5 A	80 V	1.25 W	500mV @ 50mA, 500mA	40 @ 150mA, 2V	100nA	TO-126-3	Through Hole
BD139G	onsemi	Active	1.5 A	80 V	12.5 W	500mV @ 50mA, 500mA	40 @ 150mA, 2V	100nA	TO-126	Through Hole
BD139	STMicroelectronics	Active	1.5 A	80 V	1.25 W	500mV @ 50mA, 500mA	40 @ 150mA, 2V	100nA	SOT-32-3	Through Hole
BD139-10	STMicroelectronics	Active	1.5 A	80 V	1.25 W	500mV @ 50mA, 500mA	40 @ 150mA, 2V	100nA	SOT-32	Through Hole
BD139-16	STMicroelectronics	Active	1.5 A	80 V	1.25 W	500mV @ 50mA, 500mA	40 @ 150mA, 2V	100nA	SOT-32-3	Through Hole
2N4923G	onsemi	Active	1 A	80 V	30 W	600mV @ 100mA, 1A	30 @ 500mA, 1V	500µA	TO-126	Through Hole

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

BD139G (onsemi) and BD139-16 (STMicroelectronics) are direct electrical equivalents to the BD1396S, matching all core electrical parameters including collector current, breakdown voltage, saturation voltage, and current gain. Both parts are active products with ROHS3 compliance. BD139G offers superior power dissipation capability (12.5 W versus 1.25 W), providing design margin for thermal management. BD139-16 maintains identical power rating to the original part. Both are through-hole mounted devices suitable for PCB integration.

Secondary Substitute (Electrical Equivalent with Package Variation):

BD139 (STMicroelectronics) matches all electrical specifications of the BD1396S but uses SOT-32-3 packaging instead of TO-126-3. This part is an active product with ROHS3 compliance and extensive inventory availability (435,400 units). Package compatibility must be verified against PCB layout and thermal requirements before selection.

Alternative with Parameter Deviations:

2N4923G (onsemi) is an active product with 80 V breakdown voltage matching the BD1396S but operates at reduced maximum collector current (1 A versus 1.5 A) and exhibits different saturation voltage characteristics (600mV @ 100mA, 1A versus 500mV @ 50mA, 500mA). This part is suitable only for applications where the 1 A current limit is acceptable and where the higher saturation voltage does not compromise circuit performance.

Compliance Status:

All active substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements for electronic component procurement.

Frequently Asked Questions (FAQ)

Q: Can BD139G directly replace BD1396S in existing designs?

A: BD139G is electrically equivalent to BD1396S across all specified parameters. Both are NPN transistors with 80 V breakdown voltage, 1.5 A maximum collector current, and matching saturation voltage characteristics. Package compatibility must be confirmed; BD139G uses TO-126 packaging while BD1396S uses TO-126-3. Verify PCB footprint compatibility before substitution.

Q: What is the difference between BD139, BD139-10, and BD139-16?

A: These three parts are electrically identical, all manufactured by STMicroelectronics with matching electrical specifications. The primary differences are packaging designations: BD139 uses SOT-32-3, BD139-10 uses SOT-32, and BD139-16 uses SOT-32-3. All are active products suitable for replacing the obsolete BD1396S.

Q: Why does 2N4923G have different electrical parameters?

A: 2N4923G is a different device family with a maximum collector current of 1 A (versus 1.5 A for BD1396S) and different saturation voltage characteristics. While both operate at 80 V breakdown voltage, 2N4923G is suitable only for applications where the reduced current rating and higher saturation voltage are acceptable. This part should be selected only when circuit requirements permit these parameter variations.

Q: Is package compatibility critical for substitution?

A: Yes. While electrical parameters determine functional compatibility, package type determines physical compatibility with PCB layouts. TO-126-3, TO-126, SOT-32-3, and SOT-32 packages have different pin configurations and footprints. Verify that the selected substitute part's package matches the PCB design before implementation.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active products have ongoing manufacturing and supply chain support, ensuring long-term availability for production and maintenance. Obsolete products like BD1396S have limited or no manufacturing support. Substituting with active products (BD139G, BD139, BD139-10, BD139-16, 2N4923G) ensures design sustainability and supply chain reliability.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed (BD139G, BD139, BD139-10, BD139-16, 2N4923G) carry ROHS3 compliance certification. The original BD1396S does not specify RoHS status. Compliance verification is recommended for applications subject to RoHS regulatory requirements.

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