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onsemi SPZT3904T1G
- Part No.:
- SPZT3904T1G
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
SPZT3904T1G.pdf
- Description:
- TRANS NPN 40V 0.2A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:219
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Product details
Overview
SPZT3904T1G from onsemi is an NPN silicon general-purpose transistor in SOT-223 package, rated for VCEO = 40 V, IC = 200 mA, and fT = 300 MHz, with AEC-Q101 qualification for automotive applications and Pb-free/RoHS compliance.
For engineers reviewing the SPZT3904T1G datasheet, pinout, applications, or equivalent options, key selection considerations include its DC current gain (HFE = 30–300 across 0.1–100 mA), low VCE(sat) (0.2 V @ 10 mA/1 mA), thermal resistance (RJA = 83.3 °C/W), and suitability for switching and amplification in space-constrained industrial control and automotive subsystems.
Technical Context
The SPZT3904T1G is a discrete NPN bipolar junction transistor optimized for medium-speed switching and linear amplification. Its 300 MHz fT, low Cobo (5.0 pF) and Cibo (8.0 pF), and stable hfe (100–400 at 1 kHz) support reliable small-signal performance up to audio and low-RF frequencies.
Thermal design is enabled by its SOT-223 package with RJA = 83.3 °C/W (FR-4, 1 oz Cu, 713 mm²) and RJL = 35 °C/W to lead #4, allowing operation from −55 °C to +150 °C with 1.5 W total dissipation at TA = 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum collector-emitter voltage before breakdown; defines safe operating range in switching circuits. |
| IC | 200 mA - Continuous collector current rating; supports load drive up to ~100 mW in common-emitter configurations. |
| fT | 300 MHz - Transition frequency; enables use in audio preamps, oscillator stages, and low-frequency RF buffer applications. |
| VCE(sat) | 0.2 V @ IC/IB = 10 - Low saturation voltage minimizes power loss and heat generation in digital switching designs. |
| HFE | 100 min @ IC = 10 mA - Guaranteed DC current gain ensures predictable base drive requirements in amplifier bias networks. |
| RJA | 83.3 °C/W - Thermal resistance to ambient under standard PCB layout; informs heatsinking needs for sustained 150 mW operation. |
Pinout & Package
SOT-223 package (Case 318E, Style 1) with 4 terminals: pins 1 and 2 are internally connected to collector, pin 3 is emitter, pin 4 is base - enabling high-current capability via dual-collector leads and improved thermal conduction through lead #4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | Collector | Dual-collector configuration lowers effective series resistance and improves thermal path to PCB copper. |
| 3 | Emitter | Primary current return path; tied to ground or low-impedance node in common-emitter switching topologies. |
| 4 | Base | Control input requiring ~0.7–0.95 V forward bias; designed for direct microcontroller GPIO or logic-level drive. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity, and ESD robustness per ISO/TS 16949. |
| Pb-free, Halogen-free, RoHS compliant | Meets global environmental regulations without compromising solderability or long-term intermetallic stability. |
| Low VCE(sat) and VBE(sat) | Reduces conduction losses in high-duty-cycle switching (e.g., LED drivers, relay coils) and simplifies base resistor sizing. |
| High fT and low capacitance | Supports clean signal integrity in broadband amplifiers and fast edge-rate digital interfaces up to ~50 MHz. |
Applications
| Automotive Door Module Switching | Industrial PLC Output Stage |
|---|---|
|
Use Scenario: Driving solenoid locks and status LEDs in vehicle door control units under 12 V battery supply. IC Role / Device Role / Timing Role: Discrete NPN switch controlling 150 mA loads with <35 ns turn-on delay and <50 ns fall time. Use Value: AEC-Q101 qualification ensures operational reliability across −40 °C to +105 °C ambient, while low VCE(sat) limits self-heating during continuous duty. |
Use Scenario: Level-shifting and buffering digital outputs from microcontrollers to 24 V industrial sensors and actuators. IC Role / Device Role / Timing Role: General-purpose BJT used in common-emitter configuration for current gain and isolation between logic and field-side circuits. Use Value: HFE ≥100 at 10 mA enables single-stage drive of 200 mA loads with minimal base current, reducing MCU GPIO loading. |
| Audio Pre-amplifier Stage | DC-DC Converter Feedback Transistor |
|
Use Scenario: Low-noise voltage amplification in microphone preamp circuits with 1 kΩ source impedance. IC Role / Device Role / Timing Role: Small-signal NPN amplifier with hfe = 100–400 and NF ≤5.0 dB at 1 kHz. Use Value: Optimized h-parameter set (hie = 1–10 kΩ, hoe = 1–40 μS) provides stable gain and bandwidth without external compensation. |
Use Scenario: Isolating and amplifying error signals in isolated flyback or forward converter feedback loops. IC Role / Device Role / Timing Role: Linear-mode transistor translating optocoupler output into precise reference current for PWM controller bias. Use Value: Tight VBE(sat) tolerance (0.65–0.95 V) and low hre (0.5–8 × 10−4) ensure accurate, temperature-stable feedback scaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBT3904LT1G | SOT-23 package (vs. SOT-223); lower PD (310 mW vs. 1.5 W); RJA = 300 °C/W; same electrical specs at IC ≤ 100 mA. | Not suitable for >100 mA continuous loads or high-thermal-load environments; preferred only where board space is critical. | Select MMBT3904LT1G only when footprint size outweighs thermal and current requirements. |
| ZTX653 | TO-92 package; higher VCEO (60 V); higher fT (400 MHz); no AEC-Q101 qualification; RJA = 150 °C/W. | Lacks automotive qualification and thermal performance; better suited for lab prototypes or non-automotive RF amplifiers. | Choose ZTX653 only for non-automotive designs needing higher voltage margin or bandwidth, with adequate heatsinking. |
Compared with MMBT3904LT1G and ZTX653, SPZT3904T1G uniquely combines AEC-Q101 qualification, SOT-223 thermal performance (1.5 W PD, 83.3 °C/W), and dual-collector construction - making it the only option among the three validated for production automotive body electronics with sustained 200 mA loads.
Availability
SPZT3904T1G is available at Aetrix Electronics and suitable for automotive door modules, industrial PLC output stages, and audio pre-amplifier circuits requiring stable component supply, long lifecycle support, and traceable sourcing.
Supply support for SPZT3904T1G 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 manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SPZT3904T1G belongs to onsemi's general-purpose bipolar transistor product line, engineered for robust, cost-effective switching and amplification in thermally demanding and safety-critical applications.
FAQ
What is the maximum continuous collector current rating for SPZT3904T1G?
The SPZT3904T1G has a maximum continuous collector current (IC) rating of 200 mA at TA = 25 °C. Derating applies above this temperature, and the device remains functional up to 150 °C junction temperature. This rating is supported by its SOT-223 package and 1.5 W total power dissipation capability.
Is SPZT3904T1G qualified for automotive applications?
Yes, SPZT3904T1G is AEC-Q101 qualified and PPAP capable, with full documentation for automotive use. It meets stress testing requirements for temperature cycling, mechanical shock, and ESD, and carries the "S" prefix denoting automotive-specific site and control change management.
What is the typical transition frequency (fT) of SPZT3904T1G and how does it affect circuit design?
The SPZT3904T1G has a minimum fT of 300 MHz at IC = 10 mA, VCE = 20 V, and f = 100 MHz. This enables stable small-signal amplification up to ~50 MHz and supports fast-switching applications like pulse-width modulation drivers and oscillator circuits without significant gain roll-off.
How does the dual-collector configuration (pins 1 and 2) in SPZT3904T1G improve thermal performance?
The SPZT3904T1G uses pins 1 and 2 as parallel collector connections to reduce effective bond wire resistance and enhance thermal conduction from the die to the PCB. This design contributes to its low RJA of 83.3 °C/W and enables 1.5 W dissipation - significantly higher than standard SOT-23 equivalents.
Does SPZT3904T1G meet RoHS and halogen-free requirements?
Yes, SPZT3904T1G is Pb-free, halogen-free/BFR-free, and fully RoHS compliant per EU Directive 2011/65/EU. The "G" suffix in the part number explicitly denotes green packaging, verified in onsemi's official datasheet revision 7 (October 2024).
SPZT3904T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 200 mA
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 5mA, 50mA
- Current - Collector Cutoff (Max):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 10mA, 1V
- Power - Max:
- 1.5 W
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223 (TO-261)
SPZT3904T1G FAQ
1.How can I place an order for SPZT3904T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SPZT3904T1G 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 SPZT3904T1G reliable?
The price and inventory of SPZT3904T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SPZT3904T1G is usually 5 days.
3.What payment methods are accepted for SPZT3904T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SPZT3904T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SPZT3904T1G?
SPZT3904T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SPZT3904T1G 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 SPZT3904T1G?
For technical support, including SPZT3904T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SPZT3904T1G requirements.
6.How does Aetrix verify that SPZT3904T1G is sourced from the original manufacturer or authorized distributors?
All SPZT3904T1G 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 SPZT3904T1G meets industry standards.
7.What is the process for return or replacement of SPZT3904T1G?
All SPZT3904T1G units undergo pre-shipment inspection (PSI). If there is an issue with SPZT3904T1G, 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 SPZT3904T1G part is unused and in its original packaging.
Return procedure for SPZT3904T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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