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onsemi BD788
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- Part No.:
- BD788
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
BD788.pdf
- Description:
- TRANS PNP 60V 4A TO-126
- Quantity:
- Payment:
- Shipping:
Inventory:9,478
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Product details
Overview
BD788 from onsemi is a complementary PNP silicon power transistor in TO-225 package, rated for 60 VCEO, 4.0 A continuous collector current, and 15 W total power dissipation at TC = 25°C. It delivers hFE ≥ 20 at IC = 2.0 A and VCE = 3.0 V, with fT = 50 MHz and VCE(sat) ≤ 0.8 V at IC = 2.0 A / IB = 200 mA - optimized for low-current, high-speed switching and lower-power audio amplifier stages.
For engineers reviewing the BD788 datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, thermal derating behavior, safe operating area limits, junction-to-case thermal resistance (8.34°C/W), and validated PNP transistor alternatives for legacy design support and component continuity planning.
Technical Context
The BD788 operates as a medium-power PNP bipolar junction transistor with fixed emitter-base and collector-base breakdown ratings (VEBO = 6.0 V, VCBO = 80 V) and specified saturation characteristics across IC = 0.5–4.0 A. Its fT = 50 MHz enables stable operation in audio-frequency switching and driver circuits up to ~10 MHz small-signal gain bandwidth.
Thermal performance is defined by RJC = 8.34°C/W max and power derating of 0.12 W/°C above 25°C case temperature. Safe operating area (SOA) curves include second-breakdown-limited pulse boundaries (500 µs to 5 ms) and thermally limited DC operation up to 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 Vdc - maximum collector-emitter voltage before avalanche under open-base conditions; defines upper rail limit in linear and switching applications. |
| IC (continuous) | 4.0 Adc - sustained collector current capability at TC = 25°C; requires heatsinking for higher ambient or duty-cycle operation. |
| PD (TC = 25°C) | 15 W - total power dissipation limit at case temperature 25°C; derates linearly by 0.12 W/°C above that point. |
| hFE @ IC = 2.0 A | ≥20 - minimum DC current gain at 2 A collector current and 3 V CE; supports base drive design for Class AB audio output stages. |
| fT | 50 MHz - transition frequency at IC = 100 mA, VCE = 10 V, f = 10 MHz; confirms suitability for HF switching and wideband amplification. |
| VCE(sat) @ IC/IB = 10 | ≤0.8 V - collector-emitter saturation voltage at 2.0 A collector and 200 mA base current; determines conduction loss in saturated-switching topologies. |
| Cob | 70 pF - output capacitance at VCB = 10 V, f = 0.1 MHz; impacts switching speed and Miller effect in high-frequency amplifier designs. |
Pinout & Package
BD788 is housed in a TO-225 plastic package (Case 77-09, Style 1) with 4 leads: pins 1 (Emitter), 2 & 4 (Collector), and 3 (Base). The metal tab is electrically connected to the collector and serves as a thermal path to heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Main current exit terminal for PNP operation; referenced to ground or negative rail in common-emitter configurations. |
| 2, 4 | Collector | Current input terminal; pins 2 and 4 are internally tied to the same collector node and must be used together for full current rating and thermal conduction. |
| 3 | Base | Control terminal for forward-biasing the base-emitter junction; requires current-limited drive to achieve target IC and avoid saturation delay. |
Key Features
| Feature | Design Value |
|---|---|
| Low VCEO(sus) | 60 V sustaining voltage ensures reliable blocking in 48 V and ±24 V supply rails without premature breakdown. |
| High fT × hFE product | 50 MHz fT with usable hFE ≥ 20 up to 2 A enables broadband amplification and fast switching with minimal phase shift. |
| TO-225 mechanical robustness | Plastic package with collector-tab mounting supports >15 W dissipation when mounted to ≥10 cm² aluminum heatsink with thermal interface. |
| Pb-free & RoHS compliant | G-suffix indicates lead-free termination and compliance with EU RoHS Directive 2011/65/EU for environmentally regulated production. |
Applications
| Audio Power Amplifier Stage | DC Motor Driver Half-Bridge |
|---|---|
|
Use Scenario: Complementary push-pull output stage in Class AB audio amplifiers delivering ≤5 W into 8 Ω loads. IC Role / Device Role / Timing Role: PNP output switch providing negative half-cycle current sourcing with matched NPN BD787. Use Value: VCE(sat) ≤ 0.8 V and hFE ≥ 20 at 2 A minimize crossover distortion and thermal rise in compact PCB layouts. |
Use Scenario: Low-side switch in unidirectional 24 V DC motor control circuits with PWM frequencies ≤20 kHz. IC Role / Device Role / Timing Role: PNP transistor configured as emitter-follower to drive gate of N-channel MOSFET or directly switch motor return path. Use Value: 60 V VCEO and 4 A IC rating accommodate back-EMF spikes and stall currents in brushed DC motors up to 100 W. |
| Linear Voltage Regulator Pass Element | High-Speed Logic Level Shifter |
|
Use Scenario: Series pass transistor in adjustable 3–24 V linear regulators powering analog sensor subsystems. IC Role / Device Role / Timing Role: PNP pass device controlling output voltage via base bias from error amplifier feedback loop. Use Value: Low VBE(on) ≤ 1.8 V and stable hFE over temperature enable precise load regulation with <1% line/load variation. |
Use Scenario: Bidirectional level translation between 3.3 V logic and 5–12 V industrial I/O signals in PLC input modules. IC Role / Device Role / Timing Role: PNP-based active pull-up/pull-down switch enabling fast edge transitions and rail-to-rail signal swing. Use Value: 50 MHz fT and 70 pF Cob support clean 100 ns rise/fall times at 10 kHz–1 MHz data rates without added gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD2955G | Higher VCEO = 70 V, lower fT = 3 MHz, TO-252 surface-mount package. | Preferred for space-constrained PCBs requiring SMT assembly and higher voltage margin; unsuitable for >1 MHz switching. | Select MJD2955G only if board layout mandates SMT and voltage headroom >60 V is required; not drop-in compatible due to footprint and gain-bandwidth mismatch. |
| BD139 | Lower VCEO = 80 V but only 1.5 A IC, TO-126 package, hFE min = 40 at 0.1 A. | Better suited for low-current pre-driver stages than main output switching; lacks thermal capacity for 4 A continuous loads. | Use BD139 where base drive isolation or low-power amplification is needed; BD788 remains necessary for full 4 A output capability and TO-225 mechanical mounting. |
Compared with MJD2955G and BD139, BD788 uniquely balances 4 A current handling, 60 V blocking, 50 MHz fT, and through-hole TO-225 packaging - making it irreplaceable in legacy audio amplifier and industrial control designs requiring proven thermal reliability and discrete PNP symmetry with BD787.
Availability
BD788 is available at Aetrix Electronics and suitable for audio amplifier output stages, DC motor driver circuits, and linear regulator pass elements requiring stable component supply and long-term obsolescence mitigation.
Supply support for BD788 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 specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BD788 belongs to onsemi's complementary silicon power transistor family designed specifically for cost-sensitive, medium-power linear and switching applications where PNP/NPN pairing, thermal robustness, and Pb-free compliance are essential.
FAQ
What is the maximum continuous collector current rating for BD788?
The BD788 has a maximum continuous collector current (IC) rating of 4.0 A at case temperature TC = 25°C. This rating decreases with rising case temperature due to its 0.12 W/°C power derating slope - for example, at TC = 75°C, the allowable IC drops to approximately 2.6 A based on the 15 W initial power limit. Always verify thermal design using RJC = 8.34°C/W.
Is BD788 pin-compatible with BD787G?
No, BD788 is not pin-compatible with BD787G despite sharing the same TO-225 package and pin numbering. BD788 is a PNP transistor with Emitter on pin 1, Collector on pins 2 & 4, and Base on pin 3; BD787G is an NPN device with Collector on pin 1, Emitter on pin 3, and Base on pin 2 - requiring reversed PCB layout and biasing. They are complementary in function, not physical layout.
What does the 'G' suffix in BD788G signify?
The 'G' suffix in BD788G indicates a Pb-free (lead-free) termination and RoHS-compliant construction per EU Directive 2011/65/EU. It reflects onsemi's standardized marking for environmentally compliant packaging - confirmed in the datasheet's "Ordering Information" and "Features" sections. BD788G is the only currently orderable version; non-G variants are obsolete.
Can BD788 be used in switching power supplies?
BD788 can be used in low-frequency (<50 kHz), low-power switching applications such as flyback or buck converter auxiliary switches, but it is not optimized for high-efficiency SMPS primary-side switching. Its 50 MHz fT and 70 pF Cob limit practical use to ≤200 kHz, and VCE(sat) ≥ 0.8 V at 2 A yields higher conduction losses than modern MOSFETs. For BD788, prioritize linear amplifier and motor driver roles over high-frequency power conversion.
What is the safe operating area (SOA) limitation for BD788 at DC operation?
At DC operation, BD788's SOA is thermally limited to 15 W at TC = 25°C, decreasing linearly with case temperature. At TC = 75°C, the maximum allowable DC power drops to ~9 W. Second-breakdown is not a concern at DC, but pulse operation beyond 10 ms requires checking Figure 5's "dc" curve - which shows IC ≤ 2.5 A at VCE = 20 V and TC = 25°C. Always reference the SOA plot in the BD788 datasheet for exact boundaries.
BD788 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-225AA, TO-126-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 4 A
- Voltage - Collector Emitter Breakdown (Max):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 2.5V @ 800mA, 4A
- Current - Collector Cutoff (Max):
- 100µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 200mA, 3V
- Power - Max:
- 15 W
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-126
BD788 FAQ
1.How can I place an order for BD788 through Aetrix?
Please submit a Request for Quotation (RFQ) for BD788 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 BD788 reliable?
The price and inventory of BD788 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD788 is usually 5 days.
3.What payment methods are accepted for BD788?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD788 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BD788?
BD788 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BD788 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 BD788?
For technical support, including BD788 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD788 requirements.
6.How does Aetrix verify that BD788 is sourced from the original manufacturer or authorized distributors?
All BD788 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 BD788 meets industry standards.
7.What is the process for return or replacement of BD788?
All BD788 units undergo pre-shipment inspection (PSI). If there is an issue with BD788, 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 BD788 part is unused and in its original packaging.
Return procedure for BD788:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BD788 Tags
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