Alternatives to onsemi BC817-40LT1G
onsemi BC817-40LT1G and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 BC817-40LT1Gonsemi |  BC817-40,215Nexperia USA Inc. |  BC817-40-7-FDiodes Incorporated | +2more | |
|---|---|---|---|---|
| FFF Compatibility | Exactly the same SOT-23-3 package with identical physical landing pad requirements and pin assignments.Identical outer physical dimensions and package type (SOT-23 / TO-236AB).Power dissipation (Pd) is slightly lower at 250 mW compared to the original 300 mW, which may require minor thermal consideration in maximum-load applications. | Standard SOT-23-3 footprint with the same pin assignments.Matches physical SOT-23 casing and dimensions.All critical electrical parameters meet or exceed the original part, including a slightly improved 310 mW power dissipation limit. | ||
 AI Summary | BC817-40LT1G by onsemi: Bipolar (BJT) Transistor NPN 45 V 500 mA 100MHz 300 mW Surface Mount SOT-23-3 (TO-236). | An industry-standard drop-in replacement that matches all primary electrical ratings (45V, 500mA) and the high-gain grade (-40), with a slightly lower maximum power dissipation rating.
| A highly compatible drop-in equivalent from Diodes Inc. that matches or slightly exceeds the original's power dissipation and maintains the exact same pin assignments and footprint.
| |
| Lifecycle Status | Active | Active | Active | |
| Market Availability | In stock | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | Bipolar (BJT) Transistor NPN 45 V 500 mA 100MHz 300 mW Surface Mount SOT-23-3 (TO-236) | Bipolar (BJT) Transistor NPN 45 V 500 mA 100MHz 250 mW Surface Mount TO-236AB | Bipolar (BJT) Transistor NPN 45 V 500 mA 100MHz 310 mW Surface Mount SOT-23-3 | |
| Manufacturer | onsemi | Nexperia USA Inc. | Diodes Incorporated | |
| Type | Transistors | Transistors | Transistors | |
| Datasheet | Open | Open | Open | |
| Lead Time | 52 weeks | 54 weeks | 48 weeks | |
| Country of Origin | CN | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8541.21.0075 | - | - | |
| Moisture Sensitivity Level | 1 (Unlimited) | - | - | |
| Power - Max | 300 mW | - | - | |
| Mounting Type | Surface Mount | - | - | |
| Package / Case | TO-236-3, SC-59, SOT-23-3 | - | - | |
| Transistor Type | NPN | - | - | |
| Operating Temperature | -65°C ~ 150°C (TJ) | - | - | |
| Frequency - Transition | 100MHz | - | - | |
| Supplier Device Package | SOT-23-3 (TO-236) | - | - | |
| Vce Saturation (Max) @ Ib, Ic | 700mV @ 50mA, 500mA | - | - |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 BC80740MTFonsemi | Discontinued | Obsolete | 6Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The onsemi BC817-40LT1G is active and in production. The parts listed here are qualified equivalents if you need a second source or better availability.
The closest qualified second sources for the onsemi BC817-40LT1G are the BC817-40,215 (Nexperia USA Inc.) and the BC817-40-7-F (Diodes Incorporated), out of 4 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Not always. The alternatives to the BC817-40LT1G are matched on function but can differ in package, pinout or a key parameter, so review the fit/form/function notes in the table and the datasheet before designing one in.
The BC817-40LT1G (onsemi) is a part in the Transistors category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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