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onsemi 2SB631KF
- Part No.:
- 2SB631KF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
2SB631KF.pdf
- Description:
- TRANS PNP 120V 1A TO-126
- Quantity:
- Payment:
- Shipping:
Inventory:16,088
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Product details
Overview
2SB631KF from SANYO is a PNP epitaxial planar silicon transistor rated for 100 V VCEO, −1 A continuous collector current, and 1 W power dissipation at Tc = 25 °C, designed for low-frequency power amplifier stages in audio and industrial control circuits.
For engineers reviewing the 2SB631KF datasheet, pinout, applications, or equivalent options, key selection criteria include verified VCEO/VCBO breakdown margins, hFE linearity across −10 mA to −500 mA, saturation voltage under forced β = 10, thermal derating above 25 °C case temperature, and TO-126 package mechanical compatibility.
Technical Context
This device operates as a linear PNP power switch with fixed-base biasing capability, supporting DC and low-frequency (≤1 MHz) amplification. Its design emphasizes stable hFE over wide IC range (−10 mA to −500 mA), low VCE(sat) (−0.4 V typ. at IC = −500 mA, IB = −50 mA), and robust secondary breakdown immunity per SANYO's SOA curves.
It features a monolithic epitaxial planar structure with mica-insulated TO-126 metal package, enabling direct heatsink mounting using silicone grease. Junction-to-case thermal resistance is optimized for 1 W operation at Tc ≤ 150 °C, with storage temperature range of −55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −100 V - Maximum safe collector-emitter voltage with base open; defines upper rail limit in Class-A/AB amplifier output stages. |
| IC (DC) | −1 A - Continuous collector current rating at Tc = 25 °C; usable up to −500 mA with forced β = 10 in linear operation. |
| PC | 1 W - Maximum collector power dissipation at Tc = 25 °C; derates linearly to zero at Tc = 150 °C per PC–Tc curve. |
| hFE | 20–120 - DC current gain measured at VCE = −5 V, IC = −50 mA; supports predictable biasing in emitter-follower and driver configurations. |
| VCE(sat) | −0.4 V (typ.) - Collector-emitter saturation voltage at IC = −500 mA, IB = −50 mA; minimizes conduction loss in switching applications. |
| fT | 110 MHz - Transition frequency at VCE = −10 V, IC = −50 mA; confirms suitability for low-frequency audio (<20 kHz) with margin. |
| Cob | 20 pF (typ.) - Output capacitance at VCB = −10 V, f = 1 MHz; impacts high-frequency stability and Miller effect in amplifier feedback networks. |
Pinout & Package
2SB631KF uses the TO-126 package (SANYO designation), with lead material conforming to JIS C 5022, and mica insulation for heatsink mounting. Dimensions: 15.5 mm × 11.0 mm × 4.8 mm (L×W×H), lead pitch 2.54 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current source terminal for PNP operation | Connected to positive supply rail in common-emitter amplifier; requires low-impedance path for stable bias. |
| 2 (Collector) | Current sink terminal | Mounted directly to heatsink via insulated tab; electrically tied to load or output coupling capacitor. |
| 3 (Base) | Control input for minority-carrier injection | Driven by resistive divider or driver stage; base resistor must limit IB to maintain forced β ≤ 10 for low VCE(sat). |
Key Features
| Feature | Design Value |
|---|---|
| High VCEO / VCBO | −100 V / −120 V enables use in 80 V rail systems with 20 % safety margin against transients. |
| Low VCE(sat) at high IC | −0.4 V typ. at −500 mA reduces power loss and thermal stress in Class-AB output stages. |
| hFE linearity | Stable gain across −10 mA to −500 mA supports consistent bias point setting without thermal runaway. |
| TO-126 mica insulation | Allows direct mounting to aluminum heatsinks with silicone grease, achieving RθJC ≈ 5 °C/W. |
Applications
| Audio Power Amplifier | Industrial Motor Driver |
|---|---|
Use Scenario: Final output stage in 10 W push-pull audio amplifier driving 8 Ω speaker load. IC Role / Device Role / Timing Role: PNP complement in quasi-complementary output pair delivering negative half-cycle current. Use Value: −100 V VCEO accommodates ±40 V rails; −0.4 V VCE(sat) limits quiescent heating at idle. | Use Scenario: Low-side switch controlling field winding of 24 V DC brushed motor in HVAC actuator. IC Role / Device Role / Timing Role: Linear current regulator providing precise 0.5–1 A field current under PWM-modulated base drive. Use Value: hFE linearity ensures repeatable current setpoint; TO-126 package enables bolt-on heatsinking in confined enclosure. |
| Relay Driver Circuit | Linear Voltage Regulator Pass Element |
Use Scenario: Driving 12 V, 100 mA coil of industrial control relay from microcontroller GPIO. IC Role / Device Role / Timing Role: Saturated PNP switch turning relay ON/OFF with minimal base drive overhead. Use Value: −1 A IC rating provides 10× margin over coil current; −0.4 V VCE(sat) keeps relay coil voltage drop <0.5 V. | Use Scenario: Pass transistor in adjustable 3–15 V, 0.8 A linear regulator supplying analog sensor subsystem. IC Role / Device Role / Timing Role: Series pass element dissipating up to 0.9 W under worst-case dropout (15 V in, 3 V out @ 0.8 A). Use Value: 1 W PC rating and TO-126 thermal path support continuous operation at Tc ≤ 120 °C with small heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP low-frequency power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 2SB772 | VCEO = −40 V, IC = −3 A, PC = 1.25 W, TO-126 | Limited to ≤30 V rail systems; higher current but lower voltage margin than 2SB631KF. | Select when higher IC is needed at lower voltage, and SOA allows peak IC > −1 A. |
| MJD2955G | VCEO = −70 V, IC = −10 A, PC = 15 W, TO-220 | Higher power and current, larger TO-220 package; not mechanically interchangeable with TO-126. | Choose for ≥5 W dissipation needs or where PCB layout permits TO-220 footprint and thermal mass. |
Compared with 2SB772 and MJD2955G, the 2SB631KF occupies a mid-tier niche: it delivers higher voltage capability than 2SB772 while maintaining TO-126 compactness, and offers better thermal interface simplicity than MJD2955G's TO-220-ideal for space-constrained 1 W amplifier or driver designs.
Availability
2SB631KF is available at Aetrix Electronics and suitable for audio power amplifiers, industrial motor drivers, relay interface circuits, and linear voltage regulator pass elements requiring stable component supply and long-term obsolescence management.
Supply support for 2SB631KF 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
SANYO Electric Co., Ltd. was a Japanese semiconductor manufacturer specializing in analog and power discrete devices before its acquisition by Panasonic in 2012; its legacy product lines remain widely deployed in industrial and consumer equipment.
The 2SB631KF belongs to SANYO's low-frequency power transistor family, engineered for reliability in linear amplification and switching roles where voltage headroom, gain consistency, and thermal interface simplicity are prioritized over RF performance.
FAQ
What is the maximum collector-emitter voltage rating for the 2SB631KF?
The 2SB631KF has a maximum collector-emitter voltage rating (VCEO) of −100 V at Ta = 25 °C with base open. This rating applies strictly under static DC conditions; transient spikes exceeding this value-even momentarily-may cause irreversible breakdown. The 2SB631KF datasheet specifies −120 V for VCBO, confirming robust collector-base junction integrity.
Does the 2SB631KF support linear amplifier operation, and what hFE range can be expected?
Yes, the 2SB631KF is explicitly characterized for linear amplifier use, with hFE tested from −10 mA to −500 mA at VCE = −5 V. Its hFE ranges from 20 to 120 depending on IC and test condition, and the 2SB631KF exhibits excellent linearity across this span-critical for minimizing distortion in Class-A/AB audio output stages.
What is the saturation voltage VCE(sat) of the 2SB631KF under typical operating conditions?
The 2SB631KF achieves a typical collector-emitter saturation voltage (VCE(sat)) of −0.4 V at IC = −500 mA and IB = −50 mA (forced β = 10). At lower currents like −100 mA, VCE(sat) drops to approximately −0.15 V. These values are confirmed in the 2SB631KF's electrical characteristics table and support efficient switching in relay and logic-level driver applications.
Can the 2SB631KF be mounted directly to a heatsink, and what thermal interface is recommended?
Yes, the 2SB631KF uses a mica-insulated TO-126 package specifically designed for direct heatsink mounting. SANYO recommends applying a thin, uniform layer of silicone grease between the metal tab and aluminum heatsink to minimize thermal resistance. With this setup, the 2SB631KF achieves effective junction-to-heatsink thermal resistance suitable for sustained 1 W operation within its specified Tc limits.
Is the 2SB631KF suitable for life-support or aircraft control systems?
No-the 2SB631KF is explicitly excluded from use in life-support systems, aircraft control systems, or any application where failure could reasonably cause serious physical or material damage. SANYO's documentation states that no 2SB631KF device is qualified for such high-reliability domains, and engineers must consult SANYO's successor entity (Panasonic) for certified alternatives if required.
2SB631KF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-225AA, TO-126-3
- Packaging:
- Bulk
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 120 V
- Vce Saturation (Max) @ Ib, Ic:
- 400mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 1µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 160 @ 50mA, 5V
- Power - Max:
- 1 W
- Frequency - Transition:
- 110MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-126
2SB631KF FAQ
1.How can I place an order for 2SB631KF through Aetrix?
Please submit a Request for Quotation (RFQ) for 2SB631KF 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 2SB631KF reliable?
The price and inventory of 2SB631KF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SB631KF is usually 5 days.
3.What payment methods are accepted for 2SB631KF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SB631KF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2SB631KF?
2SB631KF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2SB631KF 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 2SB631KF?
For technical support, including 2SB631KF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SB631KF requirements.
6.How does Aetrix verify that 2SB631KF is sourced from the original manufacturer or authorized distributors?
All 2SB631KF 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 2SB631KF meets industry standards.
7.What is the process for return or replacement of 2SB631KF?
All 2SB631KF units undergo pre-shipment inspection (PSI). If there is an issue with 2SB631KF, 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 2SB631KF part is unused and in its original packaging.
Return procedure for 2SB631KF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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