My Inquiry
My Account
Diodes Incorporated SB140-T
- Part No.:
- SB140-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
SB140-T.pdf
- Description:
- DIODE SCHOTTKY 40V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:4,596
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SB140-T from Diodes Incorporated is a 1.0A, 40V 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-used in low-voltage DC/DC converter output rectification and polarity protection circuits.
For engineers reviewing the SB140-T datasheet, SB140-T pinout, SB140-T application, or SB140-T equivalent, key selection criteria include forward voltage drop at rated current, peak repetitive reverse voltage rating, thermal resistance (RθJL = 15°C/W), surge robustness (40A IFSM), and RoHS-compliant tin-plated leads for lead-free assembly.
Technical Context
This discrete Schottky diode operates as a unidirectional power rectifier with metal-semiconductor junction architecture, enabling low VF and fast switching without minority-carrier storage delay. Its guard ring die structure enhances ruggedness against voltage transients in inductive load commutation.
Rated for continuous operation from –65°C to +125°C, it delivers stable performance under high-frequency switching conditions (e.g., 100 kHz+ DC/DC converters) where low conduction loss and minimal reverse recovery charge are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in polarity protection and freewheeling paths. |
| IO | 1.0 A - Average rectified output current at TL = 75°C; determines continuous power handling in linear derating applications. |
| VFM | 0.50 V @ 1.0A - Forward voltage drop; directly reduces conduction loss and improves efficiency in low-voltage (<5V) power rails. |
| IFSM | 40 A - Non-repetitive peak forward surge current (8.3ms half-sine); supports inrush and fault-current tolerance in motor drives and adapters. |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; enables direct heatsinking via PCB copper pour or lead frame for thermal management. |
| IRM | 0.5 mA @ 25°C - Peak reverse leakage at rated VRRM; low leakage preserves battery life in always-on backup power paths. |
Pinout & Package
DO-41 molded plastic package with axial leads; cathode identified by band marking; body diameter 2.00–2.72 mm, length 4.06–5.21 mm, weight ≈0.3 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential side (e.g., switch node or ground return) in freewheeling or reverse polarity protection configurations. |
| Cathode | Current exit point during forward conduction; marked with band | Connected to higher-potential rail (e.g., input supply or output capacitor positive) to enforce unidirectional current flow. |
Key Features
| Feature | Design Value |
|---|---|
| Schottky barrier construction | Enables 0.50V VF at 1.0A-reducing power loss by ~40% vs. comparable PN-junction rectifiers in 3.3V/5V outputs. |
| Guard ring die design | Improves transient voltage immunity-critical for reliability in automotive load-dump or inductive kickback environments. |
| 40A surge rating (JEDEC) | Withstands short-duration overcurrent events without degradation-supports robustness in motor control flyback paths. |
| RoHS-compliant bright tin plating | Ensures solderability per MIL-STD-202 Method 208 and compatibility with lead-free reflow profiles (peak ≤260°C). |
Applications
| DC/DC Converter Output Rectification | Polarity Protection |
|---|---|
Use Scenario: Used on secondary side of isolated buck-boost or flyback converters delivering 3.3V/5V to microcontrollers and sensors. IC Role / Device Role / Timing Role: Unidirectional power rectifier replacing PN diodes to minimize conduction loss and improve efficiency. Use Value: 0.50V VF reduces power dissipation by >0.5W vs. 1N5819 at 1A, lowering thermal stress on compact PCBs. | Use Scenario: Placed in series with power input to prevent damage from reversed battery or adapter connections. IC Role / Device Role / Timing Role: Reverse polarity blocking element with low forward drop to preserve system voltage headroom. Use Value: 40V VRRM and 0.50V VF allow use in 24V industrial inputs while maintaining ≥23.5V net supply under full load. |
| Freewheeling Diode | Low-Voltage Inverter Output Stage |
Use Scenario: Connected across relay coils, solenoids, or brushed DC motors to clamp inductive kickback. IC Role / Device Role / Timing Role: Energy recirculation path during switch-off; requires fast response and high surge tolerance. Use Value: 40A IFSM rating handles repetitive 20–30A spikes from 24V/1A actuators without thermal runaway. | Use Scenario: Output stage of 12V-to-AC inverters for LED signage or small appliances. IC Role / Device Role / Timing Role: High-frequency rectifier in push-pull or half-bridge output filtering. Use Value: Schottky architecture eliminates reverse recovery time, preventing shoot-through losses at 20–50 kHz switching frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB140-E3/54 (Vishay) | Same DO-41 package, identical 40V/1A ratings, but VF = 0.55V @ 1A (slightly higher conduction loss). | Approved for automotive PPAP; suitable where AEC-Q101 qualification is required. | Select when automotive change control and certified manufacturing traceability are mandatory. |
| 1N5819TR (ON Semiconductor) | 40V/1A rating, but VF = 0.60V @ 1A and IFSM = 25A-lower surge margin and higher loss. | Legacy industrial stock; lacks guard ring structure and has higher RθJA (60°C/W). | Acceptable for cost-sensitive, non-surge-intensive applications where thermal headroom exists. |
Compared with SB140-E3/54 and 1N5819TR, SB140-T offers the lowest forward voltage (0.50V), highest surge rating (40A), and integrated guard ring-making it optimal for space-constrained, high-efficiency, and transient-prone designs.
Availability
SB140-T is available at Aetrix Electronics and suitable for DC/DC converter output rectification, polarity protection, freewheeling diode, and low-voltage inverter output stage applications requiring stable component supply and consistent tape-and-reel delivery.
Supply support for SB140-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 Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
SB140-T belongs to the SB120–SB160 Schottky rectifier product line, engineered for high-efficiency, low-voltage power conversion in consumer, industrial, and computing systems where low VF and surge resilience are essential.
FAQ
What is the maximum junction temperature for SB140-T?
The SB140-T is rated for an operating junction temperature range of –65°C to +125°C. This specification is validated per JEDEC test conditions and reflects sustained operation under rated current and thermal management via lead conduction (RθJL = 15°C/W). Exceeding +125°C risks irreversible parametric shift and premature failure.
Is SB140-T suitable for automotive applications?
SB140-T is not AEC-Q101 qualified and is not recommended for automotive safety-critical systems. While it meets RoHS and operates across –65°C to +125°C, Diodes Incorporated explicitly states that automotive-grade parts require PPAP capability and IATF 16949 manufacturing-available only in designated automotive variants (e.g., SB140Q).
How does SB140-T differ from SB140-B?
SB140-T and SB140-B share identical electrical specifications and DO-41 packaging, differing only in packaging format: SB140-T is supplied in 5,000-piece tape-and-reel (13-inch reel), optimized for automated SMT placement; SB140-B is supplied in 1,000-piece bulk packaging for manual or semi-automated assembly.
Can SB140-T replace 1N5819 in existing designs?
Yes-SB140-T is a direct functional replacement for 1N5819 with identical DO-41 footprint and 40V/1A ratings, but offers lower VF (0.50V vs. 0.60V), higher IFSM (40A vs. 25A), and guard ring protection. No layout changes are needed, though thermal performance and efficiency will improve.
SB140-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 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 @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
- Operating Temperature - Junction:
- -65°C ~ 125°C
SB140-T FAQ
1.How can I place an order for SB140-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SB140-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 SB140-T reliable?
The price and inventory of SB140-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SB140-T is usually 5 days.
3.What payment methods are accepted for SB140-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SB140-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SB140-T?
SB140-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SB140-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 SB140-T?
For technical support, including SB140-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SB140-T requirements.
6.How does Aetrix verify that SB140-T is sourced from the original manufacturer or authorized distributors?
All SB140-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 SB140-T meets industry standards.
7.What is the process for return or replacement of SB140-T?
All SB140-T units undergo pre-shipment inspection (PSI). If there is an issue with SB140-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 SB140-T part is unused and in its original packaging.
Return procedure for SB140-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SB140-T Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
