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BUL310
STMicroelectronics
TRANS NPN 500V 5A TO220
3904 Pcs New Original In Stock
Bipolar (BJT) Transistor NPN 500 V 5 A 75 W Through Hole TO-220
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*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (59 Ratings)
BUL310
Product Overview
12876769
DiGi Electronics Part Number
BUL310-DGManufacturer
STMicroelectronics
BUL310
Description
TRANS NPN 500V 5A TO220Inventory
3904 Pcs New Original In Stock
Bipolar (BJT) Transistor NPN 500 V 5 A 75 W Through Hole TO-220
Quantity
Minimum 1
Minimum 1
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BUL310 Technical Specifications
Category
Transistors, Bipolar (BJT), Single Bipolar Transistors
Packaging
-
Series
-
Product Status
Obsolete
Transistor Type
NPN
Current - Collector (Ic) (Max)
5 A
Voltage - Collector Emitter Breakdown (Max)
500 V
Vce Saturation (Max) @ Ib, Ic
1.1V @ 600mA, 3A
Current - Collector Cutoff (Max)
250µA
DC Current Gain (hFE) (Min) @ Ic, Vce
6 @ 3A, 2.5V
Power - Max
75 W
Frequency - Transition
-
Operating Temperature
150°C (TJ)
Mounting Type
Through Hole
Package / Case
TO-220-3
Supplier Device Package
TO-220
Base Product Number
BUL310
Datasheet & Documents
Datasheets
Download BUL310 Product Specification (PDF)
HTML Datasheet
BUL310-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8541.29.0095
Additional Information
Other Names
BUL310-DG
497-7201-5
Standard Package
50
Alternative Parts
View DetailsPART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
배송이 늘 정시에 도착하고 포장도 꼼꼼합니다.
December 02, 2025
Ich vertraue auf die sichere Verpackung bei DiGi Electronics, weil meine Bestellungen stets unversehrt ankommen. Die Preise sind sehr fair.
December 02, 2025
DiGi Electronics' after-sales service is consistently professional and courteous.
December 02, 2025
Products from DiGi Electronics arrive in perfect condition, reflecting careful packing and quality control.
December 02, 2025
I've consistently received helpful after-sales service from DiGi Electronics.
December 02, 2025
Their durable supplies have proven essential for my demanding projects that require dependable electronic parts.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the BUL310 in a high-voltage switching application, especially considering its obsolete status?
When designing with the BUL310, the primary risk stems from its obsolete status, which raises long-term supply chain concerns for production and repair. Engineers should assess lifetime buy requirements or identify second sources early. Additionally, the BUL310 has a relatively low hFE (minimum 6 at 3A), requiring higher base drive current—this increases driver stage losses and complexity. Designers must also verify thermal performance: while the BUL310 supports up to 75 W dissipation, the TO-220 package requires effective heatsinking, especially above 25°C ambient. Derating the power dissipation and verifying safe operating area (SOA) under switching transients is critical to avoid thermal runaway.
How does the BUL310 compare to the MJE18004G when selecting a replacement transistor for inductive load switching in power supplies?
The BUL310 and MJE18004G both offer NPN TO-220 bipolar transistors rated for high voltage (500V) and similar current (5A), but the MJE18004G typically provides better DC current gain (hFE min ~20 vs. BUL310’s 6), reducing base drive requirements. The MJE18004G also has improved ruggedness in inductive switching due to enhanced SOA characteristics. However, the BUL310 may have tighter Vce(sat) specifications at high current. If replacing the BUL310 with the MJE18004G, confirm layout compatibility and adjust base drive resistors to prevent overdriving. The MJE18004G is not obsolete, offering better long-term availability.
What thermal design considerations are critical when integrating the BUL310 in a TO-220 package without forced air cooling?
When using the BUL310 in natural convection environments, thermal design is crucial due to its 75 W maximum power rating and 150°C max junction temperature. The TO-220 package has a thermal resistance (junction-to-case) of approximately 1.67°C/W; however, without forced air, the heatsink and ambient conditions dominate. To ensure reliability, calculate the total thermal path (junction-to-ambient), including interface materials and heatsink rating. For sustained 3–5 A operation, a large heatsink (e.g., 2–3°C/W or better) is typically required. Always include a safety margin: derate power to 50–60% of max at 40–50°C ambient and consider thermal shutdown or foldback protection in the design.
Can the BUL310 be safely used as a drop-in replacement for the BUJ303A in legacy motor drive circuits, and what parameters must be verified?
The BUL310 can serve as a partial replacement for the BUJ303A in legacy motor drive applications, but it is not a direct drop-in. Both parts share similar voltage (500V) and current (5A) ratings, but the BUJ303A typically exhibits better SOA and ruggedness under dynamic conditions like inductive kickback. The BUL310’s lower hFE increases base current needs—verify that the existing driver can supply at least 500mA to 600mA for full saturation. Additionally, check Vce(sat) at operating load: the BUL310’s 1.1V max at 3A affects conduction losses. Use a flyback diode and possibly snubbers to mitigate switching stress, and validate SOA compliance under startup and stall conditions.
What are the reliability concerns when operating the BUL310 near its maximum 500V collector-emitter voltage in a surge-prone environment?
Operating the BUL310 near its 500V breakdown limit in surge-prone environments risks premature failure due to voltage transients exceeding V(BR)CEO. Even brief overvoltage events (e.g., from inductive load switching or line surges) can push the device into avalanche, potentially causing cumulative damage despite SOA ratings. To mitigate risk, derate the operating voltage to 80% (400V max) in industrial settings. Use transient protection such as RC snubbers, metal oxide varistors (MOVs), or clamping diodes. Ensure rise/fall times in switching are controlled to reduce voltage spikes, and verify layout minimizes parasitic inductance in the collector path.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
BUL310 CAD Models
STMicroelectronics BUL310 PCB symbols & footprints
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