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2N2905A
onsemi
TRANS PNP 40V 0.6A TO39
3844 Pcs New Original In Stock
Bipolar (BJT) Transistor PNP 40 V 600 mA 600 mW Through Hole TO-39
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5.0 / 5.0
- (464 Ratings)
2N2905A
Product Overview
12834228
DiGi Electronics Part Number
2N2905A-DGManufacturer
onsemi
2N2905A
Description
TRANS PNP 40V 0.6A TO39Inventory
3844 Pcs New Original In Stock
Bipolar (BJT) Transistor PNP 40 V 600 mA 600 mW Through Hole TO-39
Quantity
Minimum 1
Minimum 1
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2N2905A Technical Specifications
Category
Transistors, Bipolar (BJT), Single Bipolar Transistors
Packaging
-
Series
-
Product Status
Obsolete
Transistor Type
PNP
Current - Collector (Ic) (Max)
600 mA
Voltage - Collector Emitter Breakdown (Max)
40 V
Vce Saturation (Max) @ Ib, Ic
1.6V @ 50mA, 500mA
Current - Collector Cutoff (Max)
-
DC Current Gain (hFE) (Min) @ Ic, Vce
100 @ 150mA, 10V
Power - Max
600 mW
Frequency - Transition
-
Operating Temperature
-
Mounting Type
Through Hole
Package / Case
TO-205AD, TO-39-3 Metal Can
Supplier Device Package
TO-39
Base Product Number
2N2905
Datasheet & Documents
Datasheets
Download 2N2905A Product Specification (PDF)
HTML Datasheet
2N2905A-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8541.21.0095
Additional Information
Standard Package
200
Alternative Parts
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MANUFACTURER
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SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
믿음직한 서비스와 친절한 스탭들 덕분에 재구매 의사가 높아졌어요.
de desembre 02, 2025
発送の正確さと梱包の丁寧さにいつも感銘を受けています。
de desembre 02, 2025
The company’s shipping process is reliable, and items arrive earlier than expected.
de desembre 02, 2025
Excellent online shopping platform that emphasizes cost-effectiveness and user satisfaction.
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Frequently Asked Questions (FAQ)
Is the 2N2905A still a viable choice for new low-power PNP switching designs given its obsolete status and non-RoHS compliance?
The 2N2905A is no longer recommended for new designs due to its obsolete status and non-RoHS compliance, which may restrict use in consumer or EU-regulated products. While it remains electrically functional for legacy support or hobbyist applications, design-in risks include supply chain instability and lack of manufacturer support. For new projects, consider modern RoHS-compliant alternatives like the MMBT2907A (surface-mount SOT-23) or PN2907A (through-hole TO-92), which offer similar or better performance with full compliance and active lifecycle support.
Can the 2N2905A safely replace a PN2907A in a high-reliability industrial control circuit without redesigning the bias network?
Direct replacement of PN2907A with 2N2905A is not recommended without verifying bias conditions, despite similar nominal specs. The 2N2905A has a higher Vce(sat) of 1.6V @ 500mA compared to ~0.4V for the PN2907A, which increases power dissipation and thermal stress in saturation-mode switching. Additionally, the TO-39 package of the 2N2905A has lower thermal resistance than TO-92, but its 600 mW power rating is borderline for sustained loads near 500 mA. Always re-evaluate base drive current and heat sinking to avoid thermal runaway in continuous operation.
What are the key reliability risks when using the 2N2905A in automotive environments near its 40V Vce(max) limit?
Operating the 2N2905A near its 40V collector-emitter breakdown voltage in automotive applications introduces significant reliability risks due to voltage transients (e.g., load dump spikes exceeding 40V). Even brief overvoltage events can degrade the junction over time, leading to premature failure. The device lacks built-in protection, and its obsolete status means no updated reliability data is available. For automotive use, replace with a higher-voltage, AEC-Q101 qualified PNP like the MJD32C (100V, SOT-223) or use external clamping (TVS diodes) and derate Vce to ≤30V for margin.
How does the 2N2905A compare to the 2N2907A in terms of switching speed and suitability for PWM applications under 10 kHz?
The 2N2905A and 2N2907A are complementary NPN/PNP pairs with similar DC characteristics, but the 2N2905A (PNP) typically exhibits slower switching due to lower hole mobility and lack of specified transition frequency (ft). In PWM applications below 10 kHz, both can function, but the 2N2905A may show higher storage time and fall time, increasing crossover losses in push-pull configurations. For better high-side switching performance, consider faster modern PNP alternatives like the BC557 (ft ~100 MHz) or use gate drivers to minimize on-time. Always include a Baker clamp or speed-up capacitor to reduce storage delay.
What design precautions are necessary when using the 2N2905A in a high-impedance sensor interface circuit due to its leakage current characteristics?
Although the 2N2905A’s collector cutoff current isn’t specified, typical PNP BJTs in this class exhibit Icbo in the nanoamp range at room temperature—but this can increase significantly with temperature and aging. In high-impedance sensor circuits (e.g., photodiode or piezoelectric interfaces), even small leakage currents can introduce offset errors or drift. To mitigate risk, avoid using the 2N2905A as an input stage transistor; instead, use it only in low-impedance switching roles. If unavoidable, add a guard ring, operate at stable temperatures, and consider a MOSFET-based solution (e.g., BSS84) for truly high-impedance nodes.
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.
2N2905A CAD Models
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