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onsemi KSA1156YS
- Part No.:
- KSA1156YS
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
KSA1156YS.pdf
- Description:
- TRANS PNP 400V 0.5A TO-126-3
- Quantity:
- Payment:
- Shipping:
Inventory:397
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Product details
Overview
KSA1156YS from onsemi is a PNP silicon bipolar junction transistor designed for high-voltage switching applications, featuring −400 V collector-emitter sustaining voltage (VCEO(sus)), −1 A pulsed collector current (ICP), and −1 V collector-emitter saturation voltage (VCE(sat)) at IC = −100 mA/IB = −10 mA. It operates in TO-126-3LD package with emitter-collector-base pinout and supports DC-DC converters and low-power switching regulators.
For engineers reviewing the KSA1156YS datasheet, pinout, applications, or equivalent options, key selection criteria include its −400 V breakdown rating, 30–200 hFE gain range, 10 W thermal dissipation at TC = 25°C, and Pb-free TO-126 construction suitable for industrial power control designs.
Technical Context
The KSA1156YS is a medium-power PNP BJT optimized for robust high-voltage switching, with verified sustaining voltage performance under inductive load conditions (L = −20 mH, IB = −10 mA). Its low VCE(sat) and VBE(sat) values enable efficient conduction in saturated-switching topologies.
Thermal design is supported by a 10 W collector dissipation rating at case temperature TC = 25°C, derating linearly to zero at TJ = 150°C. The device meets Pb-free requirements and exhibits stable hFE across IC = −100 mA with VCE = −5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO(sus) | −400 V - Sustains full rated voltage during inductive turn-off in switching regulators |
| ICP | −1 A - Supports short-duration peak loads in pulse-width modulated power stages |
| VCE(sat) | ≤ −1 V @ IC = −100 mA/IB = −10 mA - Minimizes conduction loss in saturated switch operation |
| hFE | 30–200 - Enables flexible base drive design across multiple gain bins (Y-class = 100–200) |
| PC @ TC = 25°C | 10 W - Allows high-power dissipation with appropriate heatsinking in TO-126 package |
| tF | ≤ 1 µs - Ensures fast turn-off for high-frequency DC-DC converter operation |
Pinout & Package
Package: TO-126-3LD (Case 340AS), surface-mount compatible with through-hole mounting, Pb-free, thermally enhanced plastic case with integral heat slug.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current source terminal; connected to higher potential in PNP switching configuration |
| 2 | Collector | Current sink terminal; handles high-voltage inductive loads up to −400 V |
| 3 | Base | Control input; requires negative bias current (−10 mA typical) to saturate transistor |
Key Features
| Feature | Design Value |
|---|---|
| High breakdown voltage | −400 V VCBO/VCEO - Enables direct use in 380 VAC-derived bus systems without cascading |
| Low saturation voltage | VCE(sat) ≤ −1 V - Reduces power loss and thermal stress in continuous conduction mode |
| Fast switching speed | tF ≤ 1 µs, tON ≤ 1 µs - Supports >500 kHz switching frequencies in resonant and PWM topologies |
| Pb-free TO-126 package | RoHS-compliant, thermally robust mechanical outline with exposed collector tab for heatsink attachment |
Applications
| High-Voltage Switching | Low-Power Switching Regulator |
|---|---|
Use Scenario: Controlling relay coils or solenoids powered from 200–400 VDC rails in industrial automation panels. IC Role / Device Role / Timing Role: Main high-side PNP switch providing galvanically isolated load control via base-driven saturation. Use Value: −400 V VCEO(sus) ensures reliable interruption of inductive kickback without snubber networks. | Use Scenario: Output stage in offline flyback or forward converters delivering <5 W at 12–24 V output. IC Role / Device Role / Timing Role: Primary-side switching transistor operating in discontinuous conduction mode (DCM). Use Value: Low VCE(sat) and fast tF minimize switching losses and improve efficiency at light loads. |
| DC-DC Converter | Industrial Power Supply Protection |
Use Scenario: Step-down (buck) or step-up (boost) stage in isolated 48 V telecom or PoE-powered equipment. IC Role / Device Role / Timing Role: Synchronous rectifier driver or main switching element in non-isolated topologies. Use Value: 30–200 hFE range allows precise base current tuning for optimal gate drive in hybrid configurations. | Use Scenario: Overvoltage crowbar circuit triggered by Zener reference to protect downstream SMPS inputs. IC Role / Device Role / Timing Role: Fast-acting shunt switch activated during transient overvoltage events. Use Value: 4 µs storage time (tSTG) and 1 µs fall time ensure rapid fault clamping before system damage occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-voltage switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD2955G | −70 V VCEO, 10 A ICP, TO-220 package, higher current but lower voltage rating | Better suited for low-voltage, high-current motor drivers; insufficient for 400 V bus applications | Select only if system voltage ≤ 60 V and thermal margin permits larger TO-220 footprint |
| KSA992F | −160 V VCEO, −0.7 A ICP, same TO-126 package, lower voltage rating and gain spread (50–150) | Compatible pinout but limited to sub-120 V DC-DC stages; not safe for 380 VAC-derived rails | Acceptable drop-in only in legacy designs where voltage stress remains <140 V |
Compared with KSA1156YS, MJD2955G trades voltage capability for current capacity and thermal mass, while KSA992F retains identical packaging but sacrifices 60% of breakdown margin-making KSA1156YS uniquely balanced for 400 V industrial switching where space and voltage co-constrain selection.
Availability
KSA1156YS is available at Aetrix Electronics and suitable for high-voltage switching, low-power switching regulators, and DC-DC converters requiring stable component supply and long-term industrial lifecycle support.
Supply support for KSA1156YS 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 supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The KSA1156YS belongs to onsemi's high-voltage bipolar transistor product line, engineered specifically for ruggedized industrial power conversion where reliability under sustained voltage stress and fast switching are critical.
FAQ
What is the maximum safe collector-emitter voltage for KSA1156YS in switching applications?
The KSA1156YS is rated for −400 V collector-emitter sustaining voltage (VCEO(sus)) under specified test conditions (IC = −100 mA, IB = −10 mA, L = −20 mH). This value reflects actual inductive switching capability-not just DC rating-and must be applied with appropriate snubber margins per layout parasitics. Derating is recommended above 350 V for long-term reliability in production systems using KSA1156YS.
Does KSA1156YS have a defined hFE bin, and how does it affect base drive design?
Yes, KSA1156YS is binned by hFE: Y-class devices exhibit 100–200 gain at VCE = −5 V and IC = −100 mA. This tight spread enables predictable base current calculation-e.g., −10 mA IB ensures saturation across all Y-bin units. Designers should verify minimum hFE (100) when sizing base resistors for worst-case drive in KSA1156YS circuits.
Can KSA1156YS be used in surface-mount assemblies, or is it strictly through-hole?
KSA1156YS uses the TO-126-3LD package, which features a metal tab (collector) designed for mechanical and thermal attachment to a heatsink or PCB copper pour. While traditionally mounted through-hole, its leadframe geometry supports reflow-compatible surface-mount assembly with appropriate stencil design and thermal relief-confirmed in onsemi's packaging documentation for KSA1156YS.
What is the thermal resistance junction-to-case (RθJC) for KSA1156YS?
The KSA1156YS has a published junction-to-case thermal resistance (RθJC) of 1.5°C/W, measured from die to the metal tab (pin 2/collector) under standard test conditions. This value enables accurate heatsink sizing: for example, at 5 W dissipation and 60°C max case temperature, a 15°C/W heatsink keeps junction temperature below 150°C. RθJC is validated per JESD51-2 for KSA1156YS.
Is KSA1156YS suitable for automotive applications per AEC-Q101?
No, KSA1156YS is not AEC-Q101 qualified. It is rated for industrial temperature range (TJ = −55°C to +150°C) and intended for commercial/industrial power applications. For automotive-grade PNP transistors with −400 V rating, designers should consider onsemi's AEC-Q101-qualified MJD series or contact Aetrix for validated alternatives meeting PPAP and stress-test requirements for KSA1156YS-equivalent functionality.
KSA1156YS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-225AA, TO-126-3
- Packaging:
- Bulk
- Product Status:
- Last Time Buy
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 400 V
- Vce Saturation (Max) @ Ib, Ic:
- 1V @ 10mA, 100mA
- Current - Collector Cutoff (Max):
- 100µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 100mA, 5V
- Power - Max:
- 1 W
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-126-3
KSA1156YS FAQ
1.How can I place an order for KSA1156YS through Aetrix?
Please submit a Request for Quotation (RFQ) for KSA1156YS 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 KSA1156YS reliable?
The price and inventory of KSA1156YS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA1156YS is usually 5 days.
3.What payment methods are accepted for KSA1156YS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA1156YS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSA1156YS?
KSA1156YS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSA1156YS 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 KSA1156YS?
For technical support, including KSA1156YS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA1156YS requirements.
6.How does Aetrix verify that KSA1156YS is sourced from the original manufacturer or authorized distributors?
All KSA1156YS 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 KSA1156YS meets industry standards.
7.What is the process for return or replacement of KSA1156YS?
All KSA1156YS units undergo pre-shipment inspection (PSI). If there is an issue with KSA1156YS, 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 KSA1156YS part is unused and in its original packaging.
Return procedure for KSA1156YS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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