BD140G Equivalent & Substitute Parts

Part Overview

The BD140G is an onsemi PNP bipolar junction transistor rated for 80 V collector-emitter breakdown voltage and 1.5 A maximum collector current in a TO-126 through-hole package. This device is designed for general-purpose switching and amplification applications requiring moderate power dissipation up to 1.25 W. The BD140G maintains Active product status with 1461 pieces in current inventory stock.

Substitute parts become necessary when the primary part reaches end-of-life status, when alternative packaging formats are required for manufacturing processes, or when sourcing from multiple manufacturers is required for supply chain continuity. Several equivalent devices from onsemi and STMicroelectronics share identical electrical specifications while offering different packaging configurations and availability levels.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	1.5	A
Voltage - Collector Emitter Breakdown (Max)	80	V
Vce Saturation (Max)	500	mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min	40	@ 150mA, 2V
Power - Max	1.25	W
Operating Temperature	−55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-225AA, TO-126-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the BD140G is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Transistor Type: PNP
Maximum Collector Current (Ic): 1.5 A
Collector-Emitter Breakdown Voltage: 80 V
Maximum Power Dissipation: 1.25 W
Vce Saturation: 500 mV @ 50mA, 500mA
Collector Cutoff Current: 100 nA
DC Current Gain (hFE) minimum: 40 @ 150mA, 2V

Mechanical Compatibility Criteria:

Mounting Type: Through Hole
Package Family: TO-126 or SOT-32 variants

Substitute parts are grouped into two categories:

Category 1 - Direct Electrical Equivalents (onsemi TO-126 variants): BD14016S, BD14010STU, and BD14016STU maintain identical electrical specifications with the BD140G. These parts differ in packaging format (Bulk vs. Tube) and DC current gain binning (hFE 63 or 100 vs. 40), with higher hFE values providing enhanced current amplification capability within the same electrical envelope.

Category 2 - Cross-Manufacturer Equivalents (STMicroelectronics SOT-32 variants): BD140 and BD140-16 from STMicroelectronics provide electrical equivalence with different supplier device packaging (SOT-32-3 and SOT-32 respectively). These parts maintain identical voltage, current, and power ratings while offering alternative through-hole package geometries.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown	Power (Max)	hFE (Min)	Package	Packaging Type	Product Status	Inventory
BD140G	onsemi	1.5 A	80 V	1.25 W	40 @ 150mA, 2V	TO-126-3	Bulk	Active	1461 Pcs
BD14016S	onsemi	1.5 A	80 V	1.25 W	40 @ 150mA, 2V	TO-126-3	Bulk	Last Time Buy	2400 Pcs
BD14010STU	onsemi	1.5 A	80 V	1.25 W	63 @ 150mA, 2V	TO-126-3	Tube	Active	2060 Pcs
BD14016STU	onsemi	1.5 A	80 V	1.25 W	100 @ 150mA, 2V	TO-126-3	Tube	Last Time Buy	1112 Pcs
BD140	STMicroelectronics	1.5 A	80 V	1.25 W	40 @ 150mA, 2V	SOT-32-3	Tube	Active	76205 Pcs
BD140-16	STMicroelectronics	1.5 A	80 V	1.25 W	40 @ 2V, 150mA	SOT-32	Tube	Active	30700 Pcs

Engineering Selection Recommendations

For Immediate Replacement (Active Status Priority):

The STMicroelectronics BD140 and BD140-16 are recommended as primary substitutes due to Active product status and significantly higher inventory availability (76205 and 30700 pieces respectively). Both parts maintain full electrical equivalence with the BD140G across all critical parameters. The BD140 in SOT-32-3 package provides the closest physical footprint compatibility, while BD140-16 in SOT-32 package requires PCB layout verification for pin spacing.

For Supply Chain Continuity (onsemi Ecosystem):

The onsemi BD14010STU offers Active status with 2060 pieces in stock and maintains identical electrical specifications with enhanced DC current gain (hFE 63). This part is suitable for applications where higher current amplification is beneficial within the same power envelope. The tubed packaging format accommodates automated assembly processes.

For Bulk Packaging Requirements:

The onsemi BD14016S provides bulk packaging equivalent to the BD140G with 2400 pieces available. However, this part carries Last Time Buy status, indicating limited future availability. Selection of this part should account for long-term supply constraints.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory equivalence with the BD140G. Moisture sensitivity levels vary between parts; the STMicroelectronics variants specify MSL 1 (Unlimited) compared to Not Applicable for onsemi parts, which may impact storage and handling requirements in high-humidity environments.

Frequently Asked Questions (FAQ)

Q: Can BD14010STU replace BD140G in all applications?

A: Yes. The BD14010STU maintains identical voltage (80 V), current (1.5 A), and power (1.25 W) ratings as the BD140G. The higher DC current gain (hFE 63 vs. 40) provides enhanced amplification capability without exceeding any electrical limits. The TO-126-3 package is mechanically compatible with BD140G footprints.

Q: What is the difference between BD140 (STMicroelectronics) and BD140G (onsemi)?

A: Both parts are electrically equivalent with identical Ic, Vce breakdown, power, and hFE specifications. The primary differences are manufacturer, supplier device package (SOT-32-3 vs. TO-126-3), and inventory availability. The STMicroelectronics BD140 offers significantly higher stock levels (76205 vs. 1461 pieces).

Q: Are SOT-32 and TO-126 packages interchangeable?

A: SOT-32 and TO-126 are different through-hole package geometries with different pin spacing and physical dimensions. While both are through-hole packages, PCB layout modifications are required for substitution. Pin-to-pin electrical function remains identical across all substitute parts.

Q: Why do some parts have higher hFE values (63 or 100) than the BD140G (40)?

A: DC current gain binning represents manufacturing selection of transistors within the same electrical specification range. Higher hFE values indicate transistors with greater current amplification capability. All parts meet the minimum hFE requirement of 40, making them functionally equivalent. Higher hFE parts may reduce base drive requirements in specific circuit designs.

Q: What does "Last Time Buy" status mean for BD14016S and BD14016STU?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for these parts. Existing inventory will be sold until depletion, after which the parts will no longer be available. For long-term production requirements, Active status parts (BD140G, BD14010STU, BD140, BD140-16) are recommended.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory equivalence with the BD140G for applications subject to environmental restrictions.

Q: Which substitute part offers the best availability?

A: The STMicroelectronics BD140-16 provides the highest inventory level at 30700 pieces, followed by BD140 at 76205 pieces. Both parts are in Active status with unlimited future availability, making them optimal for high-volume production requirements.

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