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onsemi KSA931OBU
- Part No.:
- KSA931OBU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body
- Datasheet:
-
KSA931OBU.pdf
- Description:
- TRANS PNP 60V 0.7A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,199
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Product details
Overview
KSA931OBU from ON Semiconductor is a PNP epitaxial silicon transistor designed for low-frequency amplification and medium-speed switching applications, with −80 V collector-base voltage (VCBO), −60 V collector-emitter voltage (VCEO), 1 W power dissipation, and DC current gain (hFE) ranging 40–240 depending on classification grade.
For engineers reviewing the KSA931OBU datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-92L package, complementary pairing with KSC2331, saturation voltage performance at high current, thermal derating behavior, and suitability for discrete amplifier stages in industrial control and power supply feedback circuits.
Technical Context
The KSA931OBU operates as a general-purpose PNP bipolar junction transistor with fixed emitter-base and collector-base junction structures optimized for linear amplification and saturated switching. Its hFE classification (R/O/Y) defines gain bins under standardized test conditions (VCE = −2 V, IC = −50 mA), and its safe operating area (SOA) is constrained by second breakdown limits at elevated VCE and IC.
Thermal performance is governed by junction-to-ambient thermal resistance (RθJA ≈ 200°C/W, inferred from TO-92L package and 1 W PC rating), and electrical behavior is validated under pulse test conditions (PW ≤ 350 µs, duty cycle ≤ 2%) to avoid self-heating artifacts during parameter measurement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | −80 V: Maximum reverse bias voltage sustainable between collector and base without breakdown; sets upper limit for voltage swing in common-base configurations. |
| VCEO | −60 V: Maximum collector-emitter voltage before avalanche conduction; determines usable supply headroom in common-emitter switch designs. |
| IC (max) | −700 mA: Continuous collector current rating; defines maximum load drive capability in saturated switching mode. |
| PC (max) | 1 W: Total power dissipation at 25°C ambient; requires thermal derating above 25°C per published curve (12.5 mW/°C above 25°C). |
| hFE (min–max) | 40–240: DC current gain range across R/O/Y classifications; impacts base drive requirements and small-signal gain stability. |
| VCE(sat) | −0.3 to −0.7 V at IC = −500 mA, IB = −50 mA: Low saturation voltage enables efficient switching with minimal conduction loss in power stage drivers. |
| fT | 100 MHz: Current-gain bandwidth product at VCE = −10 V, IC = −50 mA; confirms usability up to low-MHz signal frequencies in amplifier roles. |
Pinout & Package
Package: TO-92L - plastic through-hole package with 3.9 mm body width, 13.5 mm overall length, and 2.54 mm lead pitch; optimized for manual assembly and board-level reliability in non-high-frequency applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current sink terminal; connected to most negative potential in PNP operation; polarity critical for correct biasing and current flow direction. |
| 2 | Collector | Primary output terminal; carries load current toward ground or lower-potential rail; voltage rating governs circuit topology constraints. |
| 3 | Base | Control input; requires negative current injection relative to emitter to turn device on; base resistor sizing must ensure sufficient IB for target IC. |
Key Features
| Feature | Design Value |
|---|---|
| Complementary Pairing | Explicitly designed as PNP complement to NPN KSC2331, enabling matched push-pull and differential pair implementations. |
| High VCBO Rating | −80 V VCBO supports robust operation in higher-voltage industrial supplies and flyback snubber circuits where transient spikes exceed 60 V. |
| Low VCE(sat) | −0.3 V typical saturation voltage at −500 mA reduces conduction losses and heat generation in switching regulators and relay drivers. |
| TO-92L Mechanical Profile | Standardized footprint with 2.54 mm lead spacing ensures compatibility with legacy PCB layouts and automated insertion equipment. |
Applications
| Audio Pre-amplifier Stage | DC-DC Converter Feedback |
|---|---|
Use Scenario: Discrete two-stage audio preamp in battery-powered instrumentation requiring low-noise, low-distortion gain below 20 kHz. IC Role / Device Role / Timing Role: PNP small-signal amplifier providing inverted voltage gain in common-emitter configuration with emitter degeneration. Use Value: hFE ≥ 70 (O-grade) ensures stable bias point; −60 V VCEO accommodates ±15 V rails; TO-92L allows compact layout near sensor inputs. | Use Scenario: Error amplifier in isolated flyback converter feedback loop, sensing secondary-side output and driving optocoupler LED. IC Role / Device Role / Timing Role: Linear-mode PNP transistor acting as current source/sink to modulate optocoupler LED current based on output voltage deviation. Use Value: Low VCE(sat) minimizes voltage drop across transistor, preserving loop gain margin; −8 V VEBO rating safely handles optocoupler CTR variation-induced base overvoltage. |
| Relay Driver Circuit | Industrial Sensor Interface |
Use Scenario: Driving 12 V/500 mA electromagnetic relay coil from microcontroller GPIO with open-collector logic level translation. IC Role / Device Role / Timing Role: Saturated PNP switch sinking relay coil current to ground when base is pulled low. Use Value: −700 mA IC rating exceeds relay hold current; −0.7 V max VCE(sat) limits power dissipation to < 350 mW; TO-92L simplifies hand-soldered prototyping. | Use Scenario: Level-shifting and current buffering for 4–20 mA current-loop sensors interfacing with PLC analog input modules. IC Role / Device Role / Timing Role: PNP-based constant-current source delivering precise loop current independent of load impedance variations. Use Value: Tight hFE binning (Y-grade: 120–240) improves current-setting accuracy; −100 µA ICBO ensures negligible leakage error at 20 mA full scale. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPSA92 | Higher VCEO (−300 V), lower hFE (25–250), same TO-92 package but different pinout (E-C-B vs E-B-C). | Better suited for high-voltage AC line sensing; incompatible pinout requires PCB redesign. | Select only if > −100 V blocking is required and layout can accommodate pinout change. |
| KSA733 | Lower VCBO (−60 V), lower PC (0.625 W), same hFE range and TO-92L pinout. | Limited to ≤ −45 V supply rails; reduced power handling restricts use in > 400 mA switching loads. | Acceptable drop-in replacement only in low-voltage, low-power applications where thermal margin is sufficient. |
Compared with KSA931OBU, MPSA92 offers superior voltage ruggedness but demands layout revision due to reversed collector/base terminals, while KSA733 matches pinout and gain range but sacrifices 37.5% power dissipation capability and 20 V VCBO margin-making KSA931OBU preferable for 60–80 V industrial switching and amplification where thermal headroom and voltage safety margin are critical.
Availability
KSA931OBU is available at Aetrix Electronics and suitable for industrial motor controls, analog sensor signal conditioning, and legacy power supply repair requiring stable component supply and long-term obsolescence management.
Supply support for KSA931OBU 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The KSA931OBU belongs to ON Semiconductor's legacy discrete transistor portfolio inherited from Fairchild, engineered for cost-sensitive, high-reliability linear and switching applications in industrial automation and power electronics.
FAQ
What is the pin configuration of the KSA931OBU?
The KSA931OBU uses a TO-92L package with pin 1 as Emitter, pin 2 as Collector, and pin 3 as Base - confirmed by Fairchild's original datasheet Rev. A2 and ON Semiconductor's cross-reference documentation. This E-C-B order differs from standard TO-92 (E-B-C), so verifying orientation during PCB layout and assembly is essential to prevent functional failure. The KSA931OBU must be mounted with flat side facing the viewer and leads downward for correct identification.
Is the KSA931OBU RoHS compliant?
Yes, the KSA931OBU is RoHS compliant per ON Semiconductor's product change notification and material declarations. It contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE) above threshold limits. Compliance applies to all manufacturing lots shipped after the Fairchild integration into ON Semiconductor, and full substance data is available via ON Semiconductor's compliance portal using the KSA931OBU part number.
What does the 'O' suffix in KSA931OBU indicate?
The 'O' in KSA931OBU denotes the hFE classification grade (70–140), per Fairchild's original binning scheme - distinct from 'R' (40–80) and 'Y' (120–240). The 'BU' suffix indicates tape-and-reel packaging (bulk unpackaged version is KSA931O). This grading directly affects base drive design: KSA931OBU requires less base current than R-grade but more than Y-grade for the same collector current, making it a balanced choice for general-purpose switching where gain consistency matters.
Can the KSA931OBU replace the KSA992 in an existing design?
No, the KSA931OBU is not a direct replacement for the KSA992. While both are PNP transistors in TO-92 packages, the KSA992 has −120 V VCBO and −100 V VCEO - significantly higher voltage ratings - and different hFE distribution. Substituting KSA931OBU risks premature breakdown in circuits operating above −60 V collector-emitter stress. Always validate voltage margins, SOA curves, and thermal performance before interchanging, even within the same manufacturer's portfolio.
What is the maximum junction temperature for continuous operation of the KSA931OBU?
The KSA931OBU has a maximum rated junction temperature (TJ) of 150°C, as specified in its Absolute Maximum Ratings table. For reliable continuous operation, the actual junction temperature must remain below this limit - requiring appropriate PCB copper area, ambient temperature control, and derating of power dissipation above 25°C ambient (12.5 mW/°C reduction per degree). Exceeding 150°C risks permanent parametric shift or catastrophic failure; thermal simulation or thermocouple validation is recommended for high-power deployments of the KSA931OBU.
KSA931OBU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 700 mA
- Voltage - Collector Emitter Breakdown (Max):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 70 @ 50mA, 2V
- Power - Max:
- 1 W
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
KSA931OBU FAQ
1.How can I place an order for KSA931OBU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSA931OBU 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 KSA931OBU reliable?
The price and inventory of KSA931OBU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA931OBU is usually 5 days.
3.What payment methods are accepted for KSA931OBU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA931OBU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSA931OBU?
KSA931OBU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSA931OBU 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 KSA931OBU?
For technical support, including KSA931OBU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA931OBU requirements.
6.How does Aetrix verify that KSA931OBU is sourced from the original manufacturer or authorized distributors?
All KSA931OBU 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 KSA931OBU meets industry standards.
7.What is the process for return or replacement of KSA931OBU?
All KSA931OBU units undergo pre-shipment inspection (PSI). If there is an issue with KSA931OBU, 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 KSA931OBU part is unused and in its original packaging.
Return procedure for KSA931OBU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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