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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Diodes Incorporated SB120-T

Name: SB120-T
Brand: Diodes Incorporated
SKU: SB120-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SB120-T

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: SB120-T.pdf

Description:: DIODE SCHOTTKY 20V 1A DO41

Quantity:: RFQ Add To RFQ list

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Inventory:7,429

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Product details

Overview

SB120-T from Diodes Incorporated is a 1.0A, 20V Schottky barrier rectifier in DO-41 package, featuring 0.50V forward voltage at 1.0A, 40A non-repetitive surge capability, and guard ring die construction for transient protection. It serves as a low-loss freewheeling or polarity protection diode in DC-DC converters and automotive auxiliary power supplies.

For engineers reviewing the SB120-T datasheet, SB120-T pinout, SB120-T application, or SB120-T equivalent, key selection criteria include forward voltage drop at rated current, peak repetitive reverse voltage, thermal resistance (R_θJL = 15°C/W), surge robustness (40A @ 8.3ms), and RoHS-compliant tin-plated leads for lead-free assembly.

Technical Context

This Schottky rectifier uses a planar guard ring die structure to suppress edge breakdown and improve transient immunity. Its low V_F (0.50V @ 1.0A) and fast switching enable high-efficiency operation in low-voltage, high-frequency circuits up to several hundred kHz.

The device operates across –65°C to +125°C junction temperature, with R_θJA = 50°C/W and R_θJL = 15°C/W, supporting PCB-mounted thermal management via lead conduction. Reverse leakage remains ≤0.5mA at 20V and 25°C, rising to 10mA at 100°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	20 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in polarity protection or flyback clamp applications.
I_O	1.0 A - Average forward rectified current at T_L = 75°C; determines continuous power handling in linear regulators or buck output stages.
V_FM	0.50 V @ 1.0A - Forward voltage drop; directly sets conduction loss (0.5W @ 1A) and impacts thermal design in compact layouts.
I_FSM	40 A @ 8.3ms - Non-repetitive surge rating; enables survival during inrush or fault transients in automotive 12V systems.
R_θJL	15 °C/W - Junction-to-lead thermal resistance; allows direct heat sinking through PCB traces or copper pour connected to cathode/anode leads.
T_J Range	–65°C to +125°C - Operating junction temperature range; supports under-hood automotive and industrial ambient conditions.

Pinout & Package

Package: DO-41 molded plastic case (UL 94V-0), 0.3g weight, cathode band polarity marking, bright tin-plated leads solderable per MIL-STD-202 Method 208.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side (e.g., switch node in buck converter); requires adequate trace width for 1A continuous current.
Cathode	Forward current exit / reverse blocking terminal	Marked with band; ties to higher-potential rail (e.g., output capacitor positive); primary heat path to PCB via lead.

Key Features

Feature	Design Value
Guard ring die construction	Suppresses surface leakage and edge avalanche, improving reliability under voltage transients in automotive load-dump conditions.
Low forward voltage (0.50V)	Reduces conduction loss by ~30% vs. comparable silicon rectifiers, enabling cooler operation in space-constrained 5–12V power rails.
40A surge rating	Withstands 12V battery jump-start surges and motor commutation spikes without degradation in industrial control modules.
DO-41 package with tin plating	Enables compatibility with lead-free reflow profiles (J-STD-020C Level 1) and simplifies automated tape-and-reel placement (SB120-T variant).

Applications

DC-DC Converter Freewheeling

Automotive Polarity Protection

Use Scenario: Used as the freewheeling diode in 12V input buck converters powering infotainment displays.

IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during high-side MOSFET off-time; operates at switching frequencies up to 500kHz.

Use Value: 0.50V V_F minimizes power loss (≤0.5W) and avoids thermal derating in sealed enclosures.

Use Scenario: Placed in series with battery feed to prevent damage from reverse battery connection in telematics control units.

IC Role / Device Role / Timing Role: Unidirectional current gate; blocks reverse current while conducting 1.0A nominal system load.

Use Value: 20V V_RRM exceeds 12V automotive nominal with margin for load dump transients (up to 35V).

Low-Voltage AC/DC Adapter Output

Industrial Sensor Power Rail Clamp

Use Scenario: Rectifies transformer secondary output in wall-adapters delivering 5V/1A to USB peripherals.

IC Role / Device Role / Timing Role: Half-wave rectifier in low-cost linear or quasi-resonant SMPS output stage.

Use Value: Fast recovery (<10ns) and low V_F improve efficiency over standard PN diodes, reducing heatsink need.

Use Scenario: Clamps induced transients on 3.3V sensor supply lines in factory automation I/O modules.

IC Role / Device Role / Timing Role: Transient voltage suppressor leveraging low dynamic impedance and guard ring structure.

Use Value: 40A I_FSM absorbs 100ns–1µs ESD or inductive kick events without failure.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SB120-A	Same die and specs; packaged in 5K ammo pack instead of 5K tape-and-reel.	No functional difference; unsuitable for automated SMT placement due to packaging format.	Select SB120-T for pick-and-place production; choose SB120-A only for manual or wave-solder prototyping.
SS12	1.0A/20V Schottky in SMA package; V_F = 0.5V @ 1A but R_θJA = 75°C/W (vs. 50°C/W for SB120-T).	Higher thermal resistance limits continuous current in still-air environments; not qualified to automotive standards.	Use SS12 only in cost-sensitive consumer designs with ample airflow; SB120-T preferred for automotive-qualified builds.

Compared with SB120-A and SS12, SB120-T uniquely combines tape-and-reel automation readiness, DO-41 mechanical robustness for through-hole rework, and Diodes' AEC-Q101-capable manufacturing-making it optimal for automotive Tier-2 power modules requiring PPAP documentation and IATF 16949 traceability.

Availability

SB120-T is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC power supplies, and consumer adapter designs requiring stable component supply and RoHS-compliant assembly.

Supply support for SB120-T 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 Dallas, Texas, with design and manufacturing operations across Asia and the Americas.

The SB120-T belongs to Diodes' general-purpose Schottky rectifier product line, engineered for cost-effective, high-efficiency power conversion in automotive, industrial, and consumer applications where low V_F and surge resilience are critical.

FAQ

What is the maximum junction temperature for SB120-T during continuous operation?

The SB120-T has a maximum junction temperature of +125°C under continuous operation. This rating applies when average forward current (I_O) is limited to 1.0A at a lead temperature of 75°C, per the derating curve in Figure 1. Exceeding this temperature risks parametric shift and accelerated wear-out.

Is SB120-T suitable for use in automotive under-hood applications?

Yes-SB120-T is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101 in this specific variant, its –65°C to +125°C operating range, guard ring die, and 40A surge rating align with under-hood requirements when used within specified thermal limits.

How does the DO-41 package affect thermal performance compared to SMD Schottkys?

The DO-41 package provides superior thermal conduction via axial leads (R_θJL = 15°C/W), allowing heat transfer directly to PCB copper. Unlike SMD packages, it avoids solder-joint thermal bottlenecks but requires more board area and manual or wave-solder processes-not reflow-compatible.

Why is SB120-T marked "Not recommended for new design" in the datasheet?

The "Not recommended for new design" note (Footnote 4) reflects Diodes' internal roadmap prioritization-not obsolescence. SB120-T remains fully available and supported; newer alternatives like the AP120 series offer improved V_F and thermal metrics, but SB120-T retains value in legacy-replacement, cost-sensitive, or through-hole-focused designs.

SB120-T Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: DO-204AL, DO-41, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 20 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 500 mV @ 1 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 500 µA @ 20 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-41

Operating Temperature - Junction:: -65°C ~ 125°C

SB120-T FAQ

1.How can I place an order for SB120-T through Aetrix?

Please submit a Request for Quotation (RFQ) for SB120-T 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 SB120-T reliable?

The price and inventory of SB120-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SB120-T is usually 5 days.

3.What payment methods are accepted for SB120-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SB120-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SB120-T?

SB120-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SB120-T 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 SB120-T?

For technical support, including SB120-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SB120-T requirements.

6.How does Aetrix verify that SB120-T is sourced from the original manufacturer or authorized distributors?

All SB120-T 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 SB120-T meets industry standards.

7.What is the process for return or replacement of SB120-T?

All SB120-T units undergo pre-shipment inspection (PSI). If there is an issue with SB120-T, 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 SB120-T part is unused and in its original packaging.

Return procedure for SB120-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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