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Diodes Incorporated BSR33QTA
- Part No.:
- BSR33QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
BSR33QTA.pdf
- Description:
- TRANS PNP 80V 1A SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
BSR33QTA from Diodes Incorporated is an AEC-Q101-qualified 80V PNP medium-power transistor in SOT89 package, rated for -1A continuous collector current, with VCE(sat) < -250 mV at -150 mA and BVCEO = -80 V, used in automotive load management and solenoid/relay driver circuits.
For engineers reviewing the BSR33QTA datasheet, BSR33QTA pinout, BSR33QTA application, or BSR33QTA equivalent, key selection criteria include its AEC-Q101 qualification, low saturation voltage under high-current switching, thermal resistance of 60 °C/W on 50 mm² copper, and complementary pairing with BSR43 for push-pull designs.
Technical Context
This PNP bipolar junction transistor operates in linear or saturated switching mode with DC current gain (hFE) ranging from 30 to 300 across -100 µA to -500 mA collector current, supporting robust base-driven control in automotive power stages.
Its thermal design leverages the exposed collector pad in SOT89 for low RΘJL = 13 °C/W and scalable RΘJA (125–60 °C/W) depending on PCB copper area, enabling stable operation from -65 °C to +150 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -80 V - Withstands reverse collector-emitter voltage up to 80 V in blocking state, suitable for 24 V automotive rail switching. |
| IC (continuous) | -1 A - Supports sustained load current up to 1 A, sufficient for driving solenoids and small relays. |
| VCE(sat) | < -250 mV @ -150 mA - Minimizes conduction loss and self-heating during active switching. |
| hFE | 30–300 - Wide DC current gain range enables flexible base drive design across operating currents. |
| RΘJA | 60 °C/W (50 mm² Cu) - Enables 2.1 W power dissipation at TA = 25 °C with adequate PCB copper area. |
| ESD HBM | 4000 V - Meets JEDEC Class 3A ESD robustness for handling in automotive manufacturing environments. |
Pinout & Package
Package: SOT89 - Surface-mount plastic package with exposed collector pad for enhanced thermal performance and mechanical stability on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Main current sink terminal | Connected to exposed metal pad; primary thermal path to PCB; must be soldered to large copper area. |
| Emitter (E) | Current source reference node | Common return path for load current; tied to higher potential (e.g., battery positive in high-side switch). |
| Base (B) | Control input for transistor biasing | Receives negative current to turn on; requires series resistor to limit IB ≤ -200 mA peak. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and chassis systems. |
| Lead-free & Halogen-free | Complies with RoHS 2 and "Green" standards (<900 ppm Br/Cl, <1000 ppm Sb), supporting eco-conscious manufacturing. |
| Low VCE(sat) | Reduces power loss and thermal stress in high-duty-cycle load switching (e.g., PWM-controlled actuators). |
| Complementary pair | Designed to match BSR43 (NPN) for balanced push-pull output stages in DC-DC modules and motor drivers. |
Applications
| Automotive Load Switch | Solenoid Driver |
|---|---|
Use Scenario: Controlling 12 V/24 V lighting, HVAC dampers, or door lock actuators in passenger vehicles. IC Role / Device Role / Timing Role: High-side PNP switch managing load current flow from battery to grounded load. Use Value: Low VCE(sat) minimizes heat generation during continuous operation; AEC-Q101 ensures reliability over 15-year vehicle lifetime. | Use Scenario: Driving 500 mA–1 A DC solenoids in transmission shift control or fuel injector auxiliary circuits. IC Role / Device Role / Timing Role: Saturated-switching transistor providing fast turn-on/turn-off (Ton/Toff ≤ 500/650 ns) for precise actuation timing. Use Value: High hFE at 500 mA enables efficient base drive with minimal MCU GPIO loading. |
| Relay Interface | DC–DC Module Bias Control |
Use Scenario: Replacing mechanical relay coils in industrial control panels and automotive junction boxes. IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical relays, eliminating contact wear and bounce. Use Value: -1 A rating supports standard 12 V relay coils; integrated ESD protection reduces need for external TVS diodes. | Use Scenario: Regulating bias current in buck converter feedback loops or gate drive circuitry for synchronous rectifiers. IC Role / Device Role / Timing Role: Linear-mode current source or precision current sink in analog control paths. Use Value: Stable hFE and low VBE(sat) enable accurate current mirroring and temperature-compensated biasing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BSR33TA | Same silicon die and electrical specs; differs only in marking and reel packaging (non-automotive grade marking). | Not AEC-Q101 certified; intended for industrial/commercial use where automotive qualification is not required. | Select when cost sensitivity outweighs automotive compliance needs and PPAP documentation is unnecessary. |
| MJD2955RLG | Higher VCEO (-70 V), lower hFE (20–70), TO-252 package with higher RΘJA (65 °C/W min). | Used in legacy industrial power supplies; lacks AEC-Q101 and green compliance certifications. | Choose only if existing board layout accommodates TO-252 footprint and thermal margin permits higher RΘJA. |
Compared with BSR33TA and MJD2955RLG, BSR33QTA uniquely combines AEC-Q101 qualification, SOT89 thermal efficiency, and full RoHS/halogen-free compliance-making it the optimal choice for new automotive designs requiring PPAP support and compact, thermally robust switching.
Availability
BSR33QTA is available at Aetrix Electronics and suitable for automotive load management, solenoid/relay drivers, and DC–DC module bias control requiring stable component supply across production lifecycles.
Supply support for BSR33QTA 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and consumer markets.
The BSR33 product line delivers AEC-Q101-qualified PNP transistors optimized for automotive power switching, emphasizing thermal robustness, low saturation voltage, and green manufacturing compliance.
FAQ
What is the difference between BSR33QTA and BSR33TA?
BSR33QTA carries automotive-grade marking (BR4) and is explicitly designated for AEC-Q101-compliant applications with PPAP capability; BSR33TA uses identical silicon but lacks automotive qualification documentation and is marked for commercial/industrial use only.
Can BSR33QTA replace a mechanical relay directly?
Yes-it functions as a solid-state high-side switch capable of handling up to -1 A continuous current and -2 A pulse, with built-in ESD protection and thermal design suited for relay coil replacement in automotive junction boxes and control modules.
What PCB layout practices maximize thermal performance?
Connect the exposed collector pad to ≥50 mm² of 1 oz copper using multiple thermal vias; maintain ≥0.5 mm clearance to adjacent traces; avoid solder mask over the pad; and follow Diodes' AP02001 recommended SOT89 pad layout for optimal RΘJA = 60 °C/W.
Is BSR33QTA suitable for linear regulator applications?
It can operate in linear mode with VCE > VCE(sat), but its primary design intent is saturated switching; for precision linear regulation, dedicated pass transistors with tighter hFE tolerance and SOA curves are preferred.
BSR33QTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 80 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 100mA, 5V
- Power - Max:
- 2.1 W
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
BSR33QTA FAQ
1.How can I place an order for BSR33QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for BSR33QTA 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 BSR33QTA reliable?
The price and inventory of BSR33QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSR33QTA is usually 5 days.
3.What payment methods are accepted for BSR33QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSR33QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BSR33QTA?
BSR33QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BSR33QTA 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 BSR33QTA?
For technical support, including BSR33QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSR33QTA requirements.
6.How does Aetrix verify that BSR33QTA is sourced from the original manufacturer or authorized distributors?
All BSR33QTA 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 BSR33QTA meets industry standards.
7.What is the process for return or replacement of BSR33QTA?
All BSR33QTA units undergo pre-shipment inspection (PSI). If there is an issue with BSR33QTA, 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 BSR33QTA part is unused and in its original packaging.
Return procedure for BSR33QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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