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STMicroelectronics STD790AT4
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- Part No.:
- STD790AT4
- Manufacturer:
- STMicroelectronics
- Category:
- Single Bipolar Transistors
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
STD790AT4.pdf
- Description:
- TRANS PNP 30V 3A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:9,951
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Product details
Overview
STD790AT4 from STMicroelectronics is a medium-current, high-performance PNP bipolar junction transistor in DPAK (TO-252) package, featuring V(BR)CER = −40 V, IC = −3 A continuous, hFE > 100 at IC = −1 A, VCE(sat) = −0.15 V at IC = −0.5 A/IB = −5 mA, and Rthj-case = 8.33 °C/W - used as a heavy-load switch in battery charger switching regulators.
For engineers reviewing the STD790AT4 datasheet, STD790AT4 pinout, STD790AT4 application, or STD790AT4 equivalent, key selection criteria include saturation voltage under high current, thermal resistance in surface-mount power applications, DC gain stability across temperature, and safe operating area for pulsed load driving.
Technical Context
This PNP transistor employs ST's low-voltage "Base Island" planar process to achieve high hFE (>100 at IC = −1 A) while maintaining ultra-low VCE(sat) (−0.15 V typical at IC = −0.5 A). It operates with VCEO = −30 V and VCER = −40 V under base-emitter resistor biasing, enabling robust switching in regulated bias supplies.
Designed for surface-mount power management, it supports pulse currents up to −6 A (tP < 5 ms) and junction temperatures up to 150 °C. Its DPAK thermal performance (Rthj-case ≤ 8.33 °C/W) allows direct heatsinking via the exposed drain pad, critical for portable equipment power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V(BR)CER | −40 V: Sustains higher collector-emitter voltage when base is resistor-biased, enabling stable operation in switching regulator feedback paths. |
| IC (cont.) | −3 A: Continuous collector current rating defines maximum steady-state load drive capability in battery charger output stages. |
| VCE(sat) | −0.15 V @ IC = −0.5 A/IB = −5 mA: Low saturation voltage minimizes conduction loss and self-heating in high-duty-cycle switching. |
| hFE | ≥100 @ IC = −1 A/VCE = −2 V: High DC current gain reduces required base drive current, easing control circuit design. |
| Rthj-case | 8.33 °C/W: Thermal resistance enables predictable junction temperature rise when mounted on PCB copper, supporting thermal reliability validation. |
| TJ(max) | 150 °C: Maximum junction temperature sets upper limit for ambient + power dissipation margin in enclosed portable enclosures. |
Pinout & Package
DPAK (TO-252) surface-mount power package with exposed source pad (pin 3) for thermal conduction and mechanical anchoring. Standard three-terminal configuration optimized for high-current PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current source terminal | Connected to positive rail in high-side switch configurations; carries full load current into the device. |
| 2 (Base) | Control input | Receives negative-going drive signal to turn on PNP; requires current-sinking driver stage. |
| 3 (Collector) | Load connection node | Connected to load return path; electrically tied to exposed metal tab for thermal transfer to PCB copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low VCE(sat) | −0.15 V at IC = −0.5 A ensures < 75 mW conduction loss per transistor, critical for efficiency in compact battery chargers. |
| High hFE consistency | hFE ≥ 100 across IC = −10 mA to −3 A supports stable gain-driven base biasing without active feedback compensation. |
| DPAK thermal performance | Rthj-case ≤ 8.33 °C/W enables 15 W dissipation at Tc = 25 °C, allowing single-device use in 5–10 W portable power stages. |
| ECOPACK® compliance | Lead-free second-level interconnect meets RoHS and JEDEC JESD97 marking requirements for industrial and consumer production. |
Applications
| Battery Charger Switching Regulator | Portable Equipment Power Management |
|---|---|
Use Scenario: High-efficiency synchronous or pseudo-synchronous buck converter output stage in USB-C PD chargers. IC Role / Device Role / Timing Role: PNP switch controlling high-side current path during regulation cycle; driven by PWM controller with base current limiting. Use Value: VCE(sat) ≤ −0.25 V at IC = −1.2 A reduces conduction loss by >30% vs. standard PNP alternatives, extending thermal headroom in sealed enclosures. | Use Scenario: Load switching for display backlight or audio amplifier rails in handheld medical monitors. IC Role / Device Role / Timing Role: Heavy-load driver enabling rapid on/off control of 2–3 A subsystems under microcontroller GPIO command. Use Value: hFE > 100 at IC = −2 A permits direct MCU GPIO drive (via level-shifting transistor), eliminating dedicated driver ICs. |
| Voltage Regulation Bias Supply | Industrial Sensor Bias Circuit |
Use Scenario: Precision current source for op-amp biasing in isolated analog front-ends of portable data loggers. IC Role / Device Role / Timing Role: Constant-current sink configured with emitter degeneration resistor; stabilized by high hFE and low VBE variation. Use Value: VBE(on) = −0.8 to −1.0 V with ±0.1 V tolerance supports accurate current setting over −40 to +85 °C ambient range. | Use Scenario: Active pull-up for 4–20 mA loop transmitter outputs in field-deployable environmental sensors. IC Role / Device Role / Timing Role: High-reliability current source element with guaranteed V(BR)CER = −40 V for transient immunity on long cable runs. Use Value: VCER rating exceeds IEC 61000-4-5 surge test levels (±1 kV), ensuring uninterrupted bias delivery during ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STN790A | Same die, TO-92 through-hole package; Rthj-amb ≈ 200 °C/W vs. DPAK's 8.33 °C/W. | Limited to < 0.5 A continuous due to thermal constraints; unsuitable for >1 W power stages. | Select only for prototyping or low-power bias circuits where manual assembly is preferred. |
| MJD2955T4 | Higher VCEO (−70 V), lower hFE (20–70), larger VCE(sat) (−1.2 V @ IC = −4 A). | Used in legacy linear regulators; lacks low-saturation performance needed for modern switching topologies. | Choose only if higher breakdown voltage is mandatory and efficiency is secondary to cost or legacy compatibility. |
Compared with STN790A and MJD2955T4, STD790AT4 uniquely balances low VCE(sat), high hFE, and DPAK thermal performance - making it the only option among the three capable of sustaining −3 A continuously in compact, thermally constrained portable designs.
Availability
STD790AT4 is available at Aetrix Electronics and suitable for battery charger switching regulators, portable equipment power management, and voltage regulation bias supply circuits requiring stable component supply and long-term industrial availability.
Supply support for STD790AT4 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs, discrete devices, and MEMS sensors for automotive, industrial, and consumer markets.
STD790AT4 belongs to ST's legacy power bipolar transistor family, engineered specifically for high-efficiency, medium-current linear and switching power applications in space-constrained portable electronics.
FAQ
Is STD790AT4 suitable for automotive applications?
No - STD790AT4 is not qualified to AEC-Q101 and lacks automotive-grade screening, temperature range extension (−40 to +150 °C is not validated per automotive stress tests), and PPAP documentation. It is intended for industrial and consumer portable equipment only.
What is the recommended PCB footprint for STD790AT4?
The official TO-252 (DPAK) footprint per ST's mechanical drawing (0068772_G) requires a 6.1 mm × 6.5 mm pad for the collector tab (pin 3), with 2.3 mm pitch between pins 1 and 2, and minimum 0.45 mm solder mask clearance around all terminals.
Does STD790AT4 require a base resistor in switching applications?
Yes - because it is a current-controlled PNP transistor, a base resistor must be placed between the driver and pin 2 to limit IB and ensure saturation. Typical values range from 1.2 kΩ to 4.7 kΩ depending on driver voltage and required switching speed.
Can STD790AT4 replace an NPN transistor in the same circuit?
No - polarity reversal is not functionally equivalent. Replacing an NPN with STD790AT4 would invert logic and require redesign of biasing, drive topology, and load referencing; it is not a drop-in substitute without circuit modification.
STD790AT4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 100mA, 3A
- Current - Collector Cutoff (Max):
- 10µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 500mA, 2V
- Power - Max:
- 15 W
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
STD790AT4 FAQ
1.How can I place an order for STD790AT4 through Aetrix?
Please submit a Request for Quotation (RFQ) for STD790AT4 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 STD790AT4 reliable?
The price and inventory of STD790AT4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STD790AT4 is usually 5 days.
3.What payment methods are accepted for STD790AT4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STD790AT4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STD790AT4?
STD790AT4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STD790AT4 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 STD790AT4?
For technical support, including STD790AT4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STD790AT4 requirements.
6.How does Aetrix verify that STD790AT4 is sourced from the original manufacturer or authorized distributors?
All STD790AT4 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 STD790AT4 meets industry standards.
7.What is the process for return or replacement of STD790AT4?
All STD790AT4 units undergo pre-shipment inspection (PSI). If there is an issue with STD790AT4, 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 STD790AT4 part is unused and in its original packaging.
Return procedure for STD790AT4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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