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onsemi MSD601-ST1
- Part No.:
- MSD601-ST1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MSD601-ST1.pdf
- Description:
- TRANS NPN 50V 0.1A SC-59
- Quantity:
- Payment:
- Shipping:
Inventory:8,702
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Product details
Overview
MSD601-ST1 from onsemi is an NPN general-purpose amplifier transistor in SC-59 surface-mount package, rated for V(BR)CEO = 50 V, IC = 100 mA continuous, hFE = 210–340 at 2 mA, VCE(sat) = 0.5 V at IC/IB = 10, and PD = 200 mW - used in low-power signal amplification and switching circuits in automotive body control modules.
For engineers reviewing the MSD601-ST1 datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage margin, DC current gain consistency across temperature, saturation voltage under load, thermal derating behavior, and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This device operates as a single NPN bipolar junction transistor optimized for linear amplification and digital switching in ambient temperatures from −55 °C to +150 °C. Its hFE exhibits dual-range specification (210–340 at 2 mA; 90–? at 100 mA), and VCE(sat) remains ≤0.5 V with IB = 10 mA driving IC = 100 mA.
The SC-59 package (Case 318D) supports surface-mount assembly with 3-terminal configuration: Base (Pin 1), Emitter (Pin 2), Collector (Pin 3). Thermal resistance θJA is not explicitly listed but inferred from PD = 200 mW and TJ(max) = 150 °C derating curve showing linear power reduction above 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V(BR)CEO | 50 Vdc - ensures safe operation in 24 V automotive supply rails with transient margin |
| IC (continuous) | 100 mAdc - supports small-signal driver stages for relays, LEDs, and logic-level interfaces |
| hFE @ 2 mA | 210–340 - enables high-gain preamplifier stages with predictable biasing |
| VCE(sat) @ 100 mA | ≤0.5 Vdc - minimizes conduction loss and self-heating in saturated switch mode |
| PD | 200 mW - defines maximum dissipation at TA = 25 °C before thermal derating applies |
| TJ(max) | 150 °C - allows deployment in under-hood automotive environments without forced cooling |
| AEC-Q101 | Qualified - meets stress-test requirements for automotive electronic components |
Pinout & Package
MSD601-ST1 uses the SC-59 (Case 318D) surface-mount package: 2.90 × 1.50 × 1.15 mm body, 1.90 mm lead pitch, Pb-free construction. Pin assignment follows Style 1: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Base | Current-controlled input node; requires series resistor to limit IB and ensure stable Q-point |
| Pin 2 | Emitter | Common reference terminal in common-emitter configuration; tied to ground or current-sense path |
| Pin 3 | Collector | Output node carrying amplified/saturated load current; connects to pull-up or inductive load |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including BCM, lighting control, and sensor interface modules |
| Pb-free, Halogen-free, RoHS compliant | Meets global environmental compliance mandates without compromising solderability or reliability |
| Wide operating temperature range | Functional from −55 °C to +150 °C - suitable for engine bay and powertrain proximity mounting |
| Low VCE(sat) at rated current | 0.5 V max at IC = 100 mA / IB = 10 mA - reduces power loss and improves efficiency in switching mode |
Applications
| Automotive Body Control Module | Industrial Sensor Interface |
|---|---|
Use Scenario: Driving resistive loads such as door lock actuators and HVAC damper motors in 12 V systems. IC Role / Device Role / Timing Role: NPN switch providing current gain and isolation between microcontroller GPIO and inductive load. Use Value: Low VCE(sat) limits heat generation during sustained actuation; AEC-Q101 ensures long-term reliability in vibration-prone environments. | Use Scenario: Amplifying low-level analog signals from thermistors or potentiometers in PLC I/O modules. IC Role / Device Role / Timing Role: Linear amplifier stage with stable hFE over temperature for precision DC gain. Use Value: High hFE (210–340) enables minimal base drive current, reducing MCU port loading and system power consumption. |
| LED Driver Circuit | Power Supply Enable Switch |
Use Scenario: Sourcing current to multi-segment indicator LEDs in dashboard displays. IC Role / Device Role / Timing Role: Common-emitter current sink with fast turn-on/turn-off for PWM dimming. Use Value: Fast saturation characteristics support >1 kHz PWM without significant delay; SC-59 footprint saves board space. | Use Scenario: Enabling/disabling auxiliary 5 V or 3.3 V LDO outputs based on system state. IC Role / Device Role / Timing Role: High-side or low-side enable switch controlling LDO EN pin or pass-FET gate. Use Value: Guaranteed V(BR)CBO = 60 V prevents breakdown during supply transients; robust ICEO < 100 nA avoids false triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBT3904LT1G | V(BR)CEO = 40 V; hFE = 100–300; PD = 310 mW; SOT-23 package | Lower breakdown voltage limits use in 24 V systems; higher PD allows greater current headroom | Select when higher power dissipation is needed and 40 V rating suffices |
| NSVMSD601-RT1G | Identical electrical specs; NSV prefix denotes AEC-Q101 + PPAP-capable automotive traceability | No functional difference; differs only in manufacturing site control and documentation rigor | Prefer for Tier-1 automotive programs requiring full PPAP submission |
Compared with MMBT3904LT1G, MSD601-ST1 offers 10 V higher V(BR)CEO and tighter hFE binning - critical for 24 V automotive signal integrity. Compared with NSVMSD601-RT1G, MSD601-ST1 shares identical silicon but lacks NSV prefix and PPAP documentation - suitable for non-Tier-1 industrial designs.
Availability
MSD601-ST1 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor conditioning, LED driver circuits, and power supply enable functions requiring stable component supply and long-lifecycle availability.
Supply support for MSD601-ST1 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MSD601-ST1 belongs to onsemi's general-purpose bipolar transistor product line, designed specifically for cost-sensitive, high-reliability signal amplification and switching in harsh-environment electronics.
FAQ
What is the maximum collector-emitter voltage rating for MSD601-ST1?
The MSD601-ST1 has a guaranteed minimum V(BR)CEO of 50 Vdc at IC = 2.0 mAdc and IB = 0. This rating ensures reliable operation in 24 V automotive systems with margin for load dump transients. The absolute maximum rating must not be exceeded to avoid permanent device damage, and derating is required above 25 °C ambient per the published thermal curve.
Is MSD601-ST1 qualified for automotive applications?
Yes, MSD601-ST1 is AEC-Q101 qualified and manufactured to meet automotive reliability standards. While the NSV-prefix variant (NSVMSD601-RT1G) explicitly states PPAP capability, MSD601-ST1 shares identical die and package construction - making it suitable for automotive body electronics where full PPAP documentation is not mandated.
What package type does MSD601-ST1 use, and what are its dimensions?
MSD601-ST1 uses the SC-59 surface-mount package (Case 318D), measuring 2.90 mm × 1.50 mm × 1.15 mm with 1.90 mm lead pitch. It is Pb-free and RoHS compliant. Pin 1 is Base, Pin 2 is Emitter, and Pin 3 is Collector - confirmed by the marking diagram and mechanical outline in the official datasheet.
What is the DC current gain (hFE) range for MSD601-ST1 at typical operating conditions?
MSD601-ST1 specifies hFE1 = 210–340 at VCE = 10 Vdc and IC = 2.0 mAdc, and hFE2 = 90 (min) at VCE = 2.0 Vdc and IC = 100 mAdc. These values reflect gain behavior across linear and saturated regions - essential for designing stable bias networks and predicting switching performance in the MSD601-ST1 application circuit.
Does MSD601-ST1 have a specified thermal resistance (θJA)?
No, the datasheet does not list θJA or θJC for MSD601-ST1. Instead, it provides a derating curve showing linear reduction of PD from 200 mW at 25 °C to 0 mW at 150 °C. Designers must use this curve - not assumed thermal resistance - to calculate allowable power dissipation at elevated ambient temperatures in the final MSD601-ST1 layout.
MSD601-ST1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 10mA, 100mA
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 290 @ 2mA, 10V
- Power - Max:
- 200 mW
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59
MSD601-ST1 FAQ
1.How can I place an order for MSD601-ST1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MSD601-ST1 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 MSD601-ST1 reliable?
The price and inventory of MSD601-ST1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSD601-ST1 is usually 5 days.
3.What payment methods are accepted for MSD601-ST1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSD601-ST1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSD601-ST1?
MSD601-ST1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSD601-ST1 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 MSD601-ST1?
For technical support, including MSD601-ST1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSD601-ST1 requirements.
6.How does Aetrix verify that MSD601-ST1 is sourced from the original manufacturer or authorized distributors?
All MSD601-ST1 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 MSD601-ST1 meets industry standards.
7.What is the process for return or replacement of MSD601-ST1?
All MSD601-ST1 units undergo pre-shipment inspection (PSI). If there is an issue with MSD601-ST1, 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 MSD601-ST1 part is unused and in its original packaging.
Return procedure for MSD601-ST1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MSD601-ST1 Tags
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