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Nexperia USA Inc. BSR33-QX
- Part No.:
- BSR33-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
BSR33-QX.pdf
- Description:
- TRANS PNP 80V 1A SOT-89
- Quantity:
- Payment:
- Shipping:
Inventory:6,220
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Product details
Overview
BSR33-QX from Nexperia is a PNP medium power transistor in SOT89 package, rated for −80 V VCEO, −1 A continuous collector current, and 1.35 W total power dissipation at Tamb ≤ 25 °C. It serves as a high-side switch or linear regulator pass element in automotive-grade battery-driven systems, with AEC-Q101 qualification and exposed heatsink for thermal management.
For engineers reviewing the BSR33-QX datasheet, BSR33-QX pinout, BSR33-QX application, or BSR33-QX equivalent, key selection criteria include verified −80 V breakdown rating, DC current gain (hFE) of 100–300 at −100 mA, −5 V VCE, pulsed operation, saturation voltage under defined IC/IB conditions, and SOT89 thermal resistance (Rth(j-sp) = 13 K/W).
Technical Context
This PNP bipolar junction transistor operates in linear or switching mode with base-controlled current amplification. Its design supports stable DC biasing in high-side configurations where emitter is tied to supply rail and collector delivers load current to ground.
Thermal performance is enhanced by the SOT89 package's exposed collector pad, enabling direct PCB copper pour attachment for low Rth(j-sp) (13 K/W) and improved reliability in sustained 1 A conduction. AEC-Q101 qualification confirms suitability for automotive ambient temperature ranges (−65 °C to +150 °C) and mechanical stress requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −80 V - Maximum safe collector-emitter voltage with base open; defines high-side switch voltage headroom in 48 V or 60 V automotive systems. |
| IC | −1 A - Continuous DC collector current rating; supports medium-power loads such as fan drivers or sensor bias circuits. |
| hFE | 100–300 - DC current gain at VCE = −5 V, IC = −100 mA; enables predictable base drive sizing for stable switching or linear regulation. |
| VCE(sat) | −0.25 V (typ.) at IC = −150 mA, IB = −15 mA - Low saturation voltage minimizes conduction loss in on-state switching applications. |
| Ptot | 1.35 W - Total power dissipation at Tamb ≤ 25 °C on FR4 PCB with 6 cm² collector pad; sets practical thermal derating envelope. |
| fT | 100 MHz - Transition frequency at VCE = −10 V, IC = −50 mA; indicates usable bandwidth for moderate-speed switching (e.g., <500 kHz PWM). |
Pinout & Package
SOT89 plastic surface-mounted package (3 leads, 1.5 mm pitch, 4.5 mm × 2.5 mm × 1.5 mm body) with exposed collector pad for thermal and electrical connection to PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | PNP current source terminal; connected to positive supply rail in high-side switch configuration. |
| 2 | Collector | Main current sink terminal; electrically and thermally connected to PCB copper via exposed pad for heat removal. |
| 3 | Base | Control input; requires negative base current relative to emitter to turn on; compatible with standard logic-level or microcontroller GPIO drive. |
Key Features
| Feature | Design Value |
|---|---|
| Exposed collector pad | Enables direct thermal coupling to PCB copper pour, achieving Rth(j-sp) = 13 K/W for reliable 1 A operation without external heatsink. |
| AEC-Q101 qualification | Validated for automotive use per Stress Test Qualification for Discrete Semiconductors, covering temperature cycling, HTRB, and ESD robustness. |
| High VCEO rating | −80 V breakdown supports operation in 48 V battery architectures and transient-tolerant linear regulators with ≥20 V margin. |
| Controlled hFE spread | 100–300 range at −100 mA ensures consistent base drive requirements across production lots for predictable circuit behavior. |
Applications
| Linear Voltage Regulators | High-Side Switches |
|---|---|
|
Use Scenario: Adjustable LDO or series pass regulator supplying 3.3 V/5 V rails from 12 V–48 V automotive battery. IC Role / Device Role / Timing Role: PNP pass transistor operating in linear region, with emitter at input voltage and collector delivering regulated output. Use Value: Low VCE(sat) and stable hFE enable precise output voltage control and minimal dropout under 1 A load. |
Use Scenario: Power control for infotainment display backlight or HVAC blower motor in 12 V vehicle systems. IC Role / Device Role / Timing Role: High-side switch turning on/off load between battery and ground, controlled by MCU GPIO via base resistor. Use Value: −80 V VCEO withstands load-dump transients; exposed pad sustains 1 A continuous current without thermal shutdown. |
| Battery-Driven Devices | MOSFET Drivers |
|
Use Scenario: Power path management in portable diagnostic tools or telematics modules powered by Li-ion or lead-acid batteries. IC Role / Device Role / Timing Role: Reverse-polarity protection or main power switch isolating battery from system during sleep or fault. Use Value: AEC-Q101 qualification ensures reliability across wide ambient range (−40 °C to +125 °C); low leakage (<100 nA ICBO) preserves battery life. |
Use Scenario: Level-shifting driver stage for N-channel high-side MOSFETs in buck converters or motor gate drivers. IC Role / Device Role / Timing Role: PNP current source providing fast turn-off current to MOSFET gate, complementing NPN pull-down. Use Value: 100 MHz fT supports clean gate discharge at >100 kHz switching frequencies; −2 A ICM handles peak gate charge demands. |
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 |
|---|---|---|---|
| BSR43-Q | NPN complement; same SOT89 package, −80 V VCEO, 1 A IC, but opposite polarity and biasing requirements. | Used in low-side switching or complementary push-pull stages-not drop-in replacement for high-side PNP roles. | Select only when circuit topology requires NPN configuration or complementary pairing. |
| MMBT3906LT1G | SOT23 package; lower power (−40 V VCEO, −200 mA IC, 350 mW Ptot); no AEC-Q101 qualification. | Suitable for signal-level switching or biasing in non-automotive consumer electronics, not for 1 A automotive loads. | Choose only for cost-sensitive, low-current, non-automotive designs where thermal and voltage margins are relaxed. |
Compared with BSR43-Q and MMBT3906LT1G, the BSR33-QX provides unique combination of automotive qualification, SOT89 thermal capability, and −80 V/−1 A ratings-making it irreplaceable for high-reliability, medium-power PNP high-side switching in 12 V–48 V automotive subsystems.
Availability
BSR33-QX is available at Aetrix Electronics and suitable for linear voltage regulators, high-side switches, and battery-driven devices requiring stable component supply in automotive and industrial embedded programs.
Supply support for BSR33-QX 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
Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, high-reliability discrete and logic devices for automotive, industrial, and computing markets.
The BSR33-QX belongs to Nexperia's AEC-Q101-qualified medium-power bipolar transistor product line, engineered specifically for robust high-side switching and linear regulation in harsh automotive environments.
FAQ
Is BSR33-QX pin-compatible with other SOT89 PNP transistors?
Yes - BSR33-QX uses standard SOT89 pinning: Pin 1 = Emitter, Pin 2 = Collector (exposed pad), Pin 3 = Base. This matches JEDEC MO-220 and industry-standard SOT89 layouts, enabling mechanical compatibility with footprint-identical PNP devices, though electrical parameters must be verified independently.
What is the maximum allowable PCB copper area for optimal thermal performance?
The datasheet specifies a 6 cm² single-sided copper pad for the collector (Pin 2/exposed pad) on FR4 PCB to achieve Rth(j-a) = 93 K/W and full 1.35 W power dissipation. Reducing pad area increases thermal resistance proportionally; doubling pad size beyond 6 cm² yields diminishing returns due to FR4 thermal conductivity limits.
Does BSR33-QX support pulse operation beyond its DC ratings?
Yes - it supports peak collector current up to −2 A for single pulses ≤1 ms (ICM), and peak base current up to −200 mA under same conditions. Pulse operation must respect duty cycle limits (δ ≤ 0.01) and maintain average power within Ptot derating curves for junction temperature safety.
Can BSR33-QX replace older BSR33 variants without redesign?
Yes - BSR33-QX is a qualified enhancement of legacy BSR33 with identical pinout, electrical specifications, and SOT89 package dimensions. The "-QX" suffix denotes AEC-Q101 compliance and updated process control; no schematic or layout changes are required for drop-in replacement in existing designs.
BSR33-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- 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:
- 1.35 W
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89
BSR33-QX FAQ
1.How can I place an order for BSR33-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BSR33-QX 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 BSR33-QX reliable?
The price and inventory of BSR33-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSR33-QX is usually 5 days.
3.What payment methods are accepted for BSR33-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSR33-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BSR33-QX?
BSR33-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BSR33-QX 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 BSR33-QX?
For technical support, including BSR33-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSR33-QX requirements.
6.How does Aetrix verify that BSR33-QX is sourced from the original manufacturer or authorized distributors?
All BSR33-QX 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 BSR33-QX meets industry standards.
7.What is the process for return or replacement of BSR33-QX?
All BSR33-QX units undergo pre-shipment inspection (PSI). If there is an issue with BSR33-QX, 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 BSR33-QX part is unused and in its original packaging.
Return procedure for BSR33-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BSR33-QX Tags
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