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Diodes Incorporated 2DD2656-7
- Part No.:
- 2DD2656-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
2DD2656-7.pdf
- Description:
- TRANS NPN 30V 1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:50,856
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Product details
Overview
2DD2656-7 from Diodes Incorporated is an obsolete low-VCE(sat) NPN surface-mount transistor in SOT323 package, rated for 30 V VCEO, 1 A IC, and 300 mW power dissipation on FR-4 PCB with minimum pad layout. It delivers 270–680 hFE at 100 mA and 2 V, with typical VCE(sat) of 100 mV at IC = 500 mA / IB = 25 mA, suited for low-power switching in portable DC-DC converters and LED driver stages.
For engineers reviewing the 2DD2656-7 datasheet, 2DD2656-7 pinout, 2DD2656-7 application, or 2DD2656-7 equivalent, key selection criteria include verified VCE(sat) performance under pulsed 500 mA load, thermal resistance of 417 °C/W (min-pad), hFE consistency across –55°C to +150°C, and direct replacement guidance per Diodes' official obsolescence notice.
Technical Context
This NPN bipolar junction transistor uses epitaxial planar die construction to achieve low saturation voltage and stable gain over temperature. Its 30 V breakdown ratings (VCBO, VCEO, VEBO) support operation in 24 V rail interfaces and logic-level switching circuits.
Designed for surface-mount assembly in space-constrained applications, it features a fully RoHS-compliant matte tin finish on Alloy 42 leadframe and meets J-STD-020 Level 1 moisture sensitivity. The device is characterized under pulsed conditions (300 µs, ≤2% duty cycle) for saturation and gain parameters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - Maximum collector-emitter voltage before breakdown; enables use in 24 V systems with margin. |
| IC (cont.) | 1 A - Continuous collector current rating; supports switching loads up to ~500 mW at low VCE(sat). |
| VCE(sat) | 100 mV (typ.) at IC = 500 mA / IB = 25 mA - Enables <100 mW conduction loss in high-efficiency low-side switches. |
| hFE | 270–680 at VCE = 2 V, IC = 100 mA - Ensures reliable base drive design across production lot variation. |
| fT | 270 MHz - Supports small-signal amplification up to UHF band; usable in oscillator and RF detector front-ends. |
| RθJA | 417 °C/W (min-pad) - Requires careful PCB thermal relief design to maintain TJ < 150°C at full IC. |
Pinout & Package
Package: SOT323 - ultra-small plastic surface-mount package (2.10 × 1.30 × 0.90 mm), molded with halogen-free green compound, UL 94V-0 rated, 0.006 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal | Connected to ground or low-side return path; lowest impedance path for collector current discharge. |
| Base (B) | Control input | Receives forward-biased current to enable conduction; requires ≥25 mA drive for specified VCE(sat). |
| Collector (C) | Current source terminal | Connected to load and supply rail; carries full switched current with minimal voltage drop in saturation. |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | 100 mV typ. at 500 mA - Reduces conduction loss by >50% vs. standard general-purpose transistors. |
| Epitaxial planar die | Enables tight hFE distribution and stable fT across temperature - critical for consistent switching timing. |
| SOT323 footprint | 2.10 × 1.30 mm outline - Fits into sub-3 mm² board area; compatible with high-density portable PCB layouts. |
| Lead-free & green | Meets RoHS 3 (2015/863/EU), <900 ppm Br/Cl, <1000 ppm Sb - satisfies automotive and medical regulatory requirements. |
Applications
| Portable Power Management | LED Current Switching |
|---|---|
Use Scenario: Low-voltage DC-DC converter enable/disable control in wearables and IoT sensors. IC Role / Device Role / Timing Role: NPN low-side switch turning on/off PMIC enable pins or LDO bias networks. Use Value: 100 mV VCE(sat) minimizes enable-path voltage drop, preserving system efficiency at 1.8–3.3 V rails. |
Use Scenario: Constant-current LED dimming stage in smart lighting modules. IC Role / Device Role / Timing Role: Fast-switching current sink controlling LED cathode path during PWM cycles. Use Value: 270 MHz fT ensures clean turn-off edge at 1–5 kHz PWM frequencies, reducing flicker and EMI. |
| Automotive Body Electronics | Industrial Sensor Interface |
Use Scenario: Door lock actuator driver in 12 V body control modules. IC Role / Device Role / Timing Role: Medium-current switch driving solenoid coils with flyback protection. Use Value: 30 V VCEO withstands load-dump transients; 150°C max TJ supports under-hood placement. |
Use Scenario: Signal conditioning stage for 4–20 mA loop-powered sensors. IC Role / Device Role / Timing Role: Transimpedance amplifier active load or current mirror reference element. Use Value: Stable hFE over –55°C to +125°C ensures calibrated output accuracy across industrial ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DSS4140U | Direct replacement recommended by Diodes; SOT323, VCEO = 40 V, VCE(sat) = 120 mV @ 500 mA, hFE = 200–450 | Higher VCEO margin; slightly higher saturation voltage but improved ruggedness for inductive loads | Select when upgrading from 2DD2656-7 in new designs requiring extended voltage headroom and AEC-Q101 qualification. |
| MMBT2222ALT1G | SOT23 package, VCEO = 40 V, VCE(sat) = 150 mV @ 500 mA, hFE = 100–300, RθJA = 357 °C/W | Larger footprint; lower gain consistency; higher thermal resistance limits continuous current capability | Use only if SOT23 is already standardized in BOM and 150 mV VCE(sat) is acceptable for target efficiency targets. |
Compared with DSS4140U and MMBT2222ALT1G, the 2DD2656-7 offers the lowest VCE(sat) among its class but lacks modern automotive qualification and has discontinued status; DSS4140U provides superior long-term supply assurance and transient robustness, while MMBT2222ALT1G trades performance for broader distributor availability.
Availability
2DD2656-7 is available at Aetrix Electronics and suitable for portable power management, LED current switching, automotive body electronics, and industrial sensor interface applications requiring stable component supply despite its obsolete status.
Supply support for 2DD2656-7 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The 2DD2656 belongs to Diodes' legacy surface-mount bipolar transistor product line, engineered specifically for cost-sensitive, space-constrained low-power switching and amplification in consumer and industrial electronics.
FAQ
Is the 2DD2656-7 still in production?
No, the 2DD2656-7 is officially obsolete and discontinued per Diodes' datasheet DS31638 Rev. 3–4 (May 2024). Diodes explicitly recommends migrating to DSS4140U as the designated replacement part with updated specifications and active production status.
What is the maximum safe operating current for 2DD2656-7 at 85°C ambient?
At TA = 85°C, derated power dissipation is ~180 mW (per Fig. 1), limiting continuous IC to approximately 420 mA assuming VCE(sat) ≈ 120 mV - well below the 1 A rating, which applies only at 25°C with ideal thermal conditions.
Can the 2DD2656-7 be used in linear amplifier configurations?
Yes, its 270–680 hFE range and 270 MHz fT support small-signal amplification, but the device is optimized for switching: VCE(sat) is specified under pulsed conditions, and linearity is not characterized in the datasheet.
Does the 2DD2656-7 meet AEC-Q101 stress test requirements?
No, the 2DD2656-7 is not AEC-Q101 qualified. Diodes states that automotive-grade variants require specific change control and PPAP capability - features confirmed only for newer replacements like DSS4140U, not this obsolete part.
2DD2656-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 350mV @ 25mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 270 @ 100mA, 2V
- Power - Max:
- 300 mW
- Frequency - Transition:
- 270MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
2DD2656-7 FAQ
1.How can I place an order for 2DD2656-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 2DD2656-7 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 2DD2656-7 reliable?
The price and inventory of 2DD2656-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2DD2656-7 is usually 5 days.
3.What payment methods are accepted for 2DD2656-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2DD2656-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2DD2656-7?
2DD2656-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2DD2656-7 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 2DD2656-7?
For technical support, including 2DD2656-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2DD2656-7 requirements.
6.How does Aetrix verify that 2DD2656-7 is sourced from the original manufacturer or authorized distributors?
All 2DD2656-7 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 2DD2656-7 meets industry standards.
7.What is the process for return or replacement of 2DD2656-7?
All 2DD2656-7 units undergo pre-shipment inspection (PSI). If there is an issue with 2DD2656-7, 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 2DD2656-7 part is unused and in its original packaging.
Return procedure for 2DD2656-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
2DD2656-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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