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onsemi 2N5655
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- Part No.:
- 2N5655
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
2N5655.pdf
- Description:
- TRANS NPN 250V 0.5A TO-126
- Quantity:
- Payment:
- Shipping:
Inventory:2,233
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Product details
Overview
2N5655 from onsemi is a plastic NPN silicon high-voltage power transistor designed for line-operated equipment. It features VCEO = 250 V, IC = 0.5 A continuous, PD = 20 W at TC = 25°C, hFE ≥ 25 at IC = 50 mA, and TO-225 package. It is used in audio output amplifiers, low-current high-voltage converters, and AC line relays.
For engineers reviewing the 2N5655 datasheet, pinout, applications, or equivalent options, key selection criteria include verified VCEO(sus) = 250 V under inductive load, thermal resistance RθJC = 6.25°C/W, safe operating area limits per Figure 3, DC current gain across temperature (–55°C to +150°C), and Pb-free RoHS-compliant packaging.
Technical Context
The 2N5655 operates as a medium-power NPN switching and linear amplifier transistor with high-voltage blocking capability. Its design emphasizes robustness in inductive switching applications, evidenced by sustained voltage rating VCEO(sus) = 250 V under 50 mH inductive load and second-breakdown-limited SOA curves.
It delivers DC current gain hFE from 25 to 250 depending on collector current (50–500 mA) and junction temperature (–55°C to +150°C), and supports dynamic operation up to fT = 10 MHz at IC = 50 mA, VCE = 10 V. Output capacitance Cob ≤ 25 pF enables stable high-voltage switching performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 250 V - Maximum collector-emitter voltage before breakdown under specified test conditions; defines safe DC/peak operating ceiling in line-powered circuits. |
| IC (continuous) | 0.5 A - Continuous collector current limit at TC = 25°C; derates linearly above 25°C at 0.16 W/°C. |
| PD | 20 W - Total device dissipation at case temperature 25°C; requires heatsinking to maintain junction temperature ≤ 150°C. |
| hFE (min) | 25 - Minimum DC current gain at IC = 50 mA, VCE = 10 V; ensures reliable base drive sizing for switching or amplification. |
| RθJC | 6.25 °C/W - Junction-to-case thermal resistance; determines required heatsink thermal impedance for target TJ. |
| fT | 10 MHz - Current-gain bandwidth product at IC = 50 mA; indicates usable frequency range for small-signal amplification. |
| Cob | ≤ 25 pF - Output capacitance at VCB = 10 V; impacts switching speed and EMI in high-voltage flyback or relay driver stages. |
Pinout & Package
2N5655 is housed in a TO-225 package (Case 77-09, Style 1), with 4 leads: pins 1 and 3 are emitter and base respectively; pins 2 and 4 are electrically connected collectors; the backside metal tab is collector-connected and serves as thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Emitter | Main current exit terminal; referenced for base drive and bias network return in common-emitter configurations. |
| Pin 2 & Pin 4 | Collector | Parallel-connected high-voltage terminals; provide dual mechanical attachment points and enhanced current handling/solder joint reliability. |
| Pin 3 | Base | Control input for bipolar conduction; requires current-limited drive due to IB(max) = 1.0 A and VBE(on) ≈ 1.0 V. |
| Backside Tab | Collector (thermal & electrical) | Electrically tied to collector; must be isolated from chassis unless circuit design permits direct mounting to heatsink. |
Key Features
| Feature | Design Value |
|---|---|
| High VCEO(sus) | 250 V under 50 mH inductive load - Enables reliable operation in AC-line relay drivers and flyback converter primary switches without snubber overdesign. |
| Wide hFE range | 25–250 across IC = 50–500 mA - Supports both precision biasing in linear audio stages and simplified gate-drive translation in switching applications. |
| Pb-free RoHS compliance | G-marked TO-225 package - Meets global environmental regulations without compromising thermal or mechanical performance. |
| Second-breakdown SOA | Defined limits up to 100 V / 0.5 A (10 ms pulse) - Provides predictable failure boundary for transient overload protection in industrial control outputs. |
Applications
| AC Line Relay Drivers | Audio Output Amplifiers |
|---|---|
Use Scenario: Driving electromagnetic relays directly from microcontroller GPIO via base resistor, interfacing 120/230 VAC mains lines. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling relay coil current; handles inductive kickback with sustained 250 V rating. Use Value: Eliminates need for optocoupler + MOSFET staging; reduces BOM count while maintaining safety isolation via transformer-coupled control side. |
Use Scenario: Single-ended Class-A or Class-AB output stage in low-cost audio equipment (e.g., intercoms, paging systems). IC Role / Device Role / Timing Role: Linear power amplification device delivering up to 0.5 A into 4–8 Ω loads with minimal distortion at mid-band frequencies. Use Value: Delivers sufficient gain and thermal margin (20 W PD) for 1–3 W RMS output without forced-air cooling. |
| Low-Current HV Converters | Industrial Control Outputs |
Use Scenario: Primary-side switch in discontinuous-mode flyback converters supplying <10 W at >200 VDC output (e.g., sensor power supplies). IC Role / Device Role / Timing Role: Pulse-width modulated high-voltage switch; rated for 250 V VCEO and 10 MHz fT for stable loop response. Use Value: Enables compact transformer design with reduced turns ratio; Cob ≤ 25 pF minimizes switching loss at 50–100 kHz. |
Use Scenario: Solid-state replacement for electromechanical contactors in PLC output modules driving solenoids or indicator lamps. IC Role / Device Role / Timing Role: Robust interface between logic-level controller and 120/240 VAC industrial loads; withstands repetitive surge events per IEC 61000-4-5. Use Value: Extends service life vs. relays; supports >100 k cycle endurance with no moving parts and predictable thermal shutdown behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD127G | VCEO = 100 V, IC = 2 A, TO-252 package; lower voltage rating but higher current and surface-mount form factor. | Not suitable for 250 V line-referenced switching; better for low-voltage DC-DC or motor control where PCB space is constrained. | Select MJD127G only when system voltage remains ≤ 80 V and SMT assembly is required. |
| 2N5551 | VCEO = 160 V, IC = 0.6 A, TO-92 package; smaller package, lower power (0.625 W), no thermal tab. | Cannot replace 2N5655 in line-powered or high-dissipation roles; limited to signal amplification or low-power switching below 100 V. | Choose 2N5551 only for sub-100 mW bias networks or pre-driver stages-not for main power switching. |
Compared with MJD127G and 2N5551, the 2N5655 uniquely balances 250 V blocking, 20 W dissipation, and through-hole TO-225 mechanical robustness-making it irreplaceable in legacy AC-line relay and audio output designs requiring proven thermal and SOA margins.
Availability
2N5655 is available at Aetrix Electronics and suitable for AC line relay drivers, audio output amplifiers, low-current high-voltage converters, and industrial control outputs requiring stable component supply across long-lifecycle industrial programs.
Supply support for 2N5655 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 2N5655 belongs to onsemi's legacy high-voltage bipolar power transistor family, engineered specifically for reliability in line-operated equipment-including audio amplifiers, relay interfaces, and low-power HV DC-DC conversion where ruggedness and SOA predictability outweigh digital integration needs.
FAQ
What is the maximum safe collector-emitter voltage for 2N5655 in continuous DC operation?
The 2N5655 has a rated VCEO = 250 VDC, verified per JEDEC standards. This is the absolute maximum DC voltage that can be applied between collector and emitter with base open. Exceeding this risks avalanche breakdown and permanent damage. For inductive switching, VCEO(sus) = 250 V is validated under 50 mH load with 100 V clamp, per Figure 2 test circuit in the official datasheet.
Does 2N5655 support surface-mount assembly?
No, the 2N5655 is exclusively offered in the through-hole TO-225 package (Case 77-09). It is not available in any surface-mount variant. The package features pins 1–4 and an electrically active collector tab requiring mechanical mounting and thermal interface to a heatsink. SMT alternatives like MJD127G exist but differ in voltage rating and footprint.
What is the thermal resistance from junction to case for 2N5655?
The 2N5655 has a specified thermal resistance RθJC = 6.25°C/W. This value is measured from the silicon junction to the case surface (collector tab), and is critical for calculating heatsink requirements. At full 20 W dissipation, a 6.25°C/W RθJC implies a 125°C temperature rise from case to junction-so case temperature must remain ≤ 25°C to hold TJ ≤ 150°C.
Can 2N5655 replace 2N5657G in a design?
No-2N5655 and 2N5657G are distinct variants: 2N5655G is rated for VCEO = 250 V, while 2N5657G is rated for 350 V. Their SOA curves, sustaining voltage test conditions, and safe operating boundaries differ. Substituting 2N5655 for 2N5657G in a 350 V application violates maximum ratings and risks catastrophic failure. They share package and pinout but are not interchangeable.
Is 2N5655 suitable for use in automotive applications?
The 2N5655 is not qualified to AEC-Q101 or automotive-grade specifications. Its datasheet specifies operating junction temperature from –65°C to +150°C, but does not include automotive-specific stress testing (e.g., HTOL, temperature cycling, ESD HBM ≥ 2 kV). It is intended for industrial, commercial, and consumer line-powered equipment-not safety-critical or vehicular environments.
2N5655 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-225AA, TO-126-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 250 V
- Vce Saturation (Max) @ Ib, Ic:
- 10V @ 100mA, 500mA
- Current - Collector Cutoff (Max):
- 100µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 30 @ 100mA, 10mV
- Power - Max:
- 20 W
- Frequency - Transition:
- 10MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-126
2N5655 FAQ
1.How can I place an order for 2N5655 through Aetrix?
Please submit a Request for Quotation (RFQ) for 2N5655 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 2N5655 reliable?
The price and inventory of 2N5655 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N5655 is usually 5 days.
3.What payment methods are accepted for 2N5655?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N5655 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2N5655?
2N5655 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2N5655 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 2N5655?
For technical support, including 2N5655 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N5655 requirements.
6.How does Aetrix verify that 2N5655 is sourced from the original manufacturer or authorized distributors?
All 2N5655 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 2N5655 meets industry standards.
7.What is the process for return or replacement of 2N5655?
All 2N5655 units undergo pre-shipment inspection (PSI). If there is an issue with 2N5655, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 2N5655 part is unused and in its original packaging.
Return procedure for 2N5655:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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