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Diodes Incorporated SB170-T
- Part No.:
- SB170-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
SB170-T.pdf
- Description:
- DIODE SCHOTTKY 70V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:6,457
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Product details
Overview
SB170-T from Diodes Incorporated is a 1.0A, 70V peak repetitive reverse voltage Schottky barrier rectifier in DO-41 package, featuring 0.80V forward voltage at 1.0A, 25A non-repetitive surge capability, and 15K/W junction-to-lead thermal resistance. It serves as a low-loss freewheeling or polarity protection diode in DC/DC converters and 60Hz AC rectification circuits.
For engineers reviewing the SB170-T datasheet, SB170-T pinout, SB170-T application, or SB170-T equivalent, key selection factors include its 70V VRRM rating, 0.80V VFM at rated current, DO-41 mechanical compatibility, RoHS-compliant tin-plated leads, and thermal performance under 85°C lead temperature derating.
Technical Context
This Schottky rectifier uses guard ring die construction to enhance transient immunity and prevent edge breakdown. Its low forward voltage drop and fast switching (no minority carrier storage) enable high-efficiency operation in high-frequency inverters and low-voltage power supplies.
The device is rated for single-phase, half-wave 60Hz operation with resistive or inductive loads; capacitive loads require 20% current derating. Junction-to-ambient thermal resistance is 50K/W when leads are held at ambient at 9.5mm from case per JESD51-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 70 V - Maximum repetitive reverse voltage before breakdown; defines safe blocking range in polarity protection and flyback clamp circuits. |
| IO @ TT=85°C | 1.0 A - Average forward current rating at 85°C lead temperature; determines continuous power handling in thermally constrained PCB layouts. |
| VFM @ IF=1.0A | 0.80 V - Forward voltage drop at rated DC current; directly sets conduction loss (0.8W at 1A) and thermal load in linear regulators or OR-ing circuits. |
| IFSM (8.3ms) | 25 A - Non-repetitive surge current capacity; supports inrush current tolerance during power-up in capacitor-input rectifiers. |
| RJL | 15 K/W - Junction-to-lead thermal resistance; enables direct heatsinking via PCB copper pour or lead frame, critical for sustained 1A operation. |
| Tj Range | –65°C to +125°C - Operating junction temperature window; ensures reliability in automotive under-hood or industrial control environments. |
Pinout & Package
DO-41 axial-leaded plastic package with cathode band marking; body diameter 4.1–5.2 mm, length 25.4 mm, lead diameter 0.71–0.86 mm, lead spacing 2.0–2.7 mm. Cathode band identifies terminal polarity for correct PCB orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of circuit (e.g., ground return or switch node); must handle full load current and surge transients. |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; connects to higher-potential rail (e.g., input supply or output rail); blocks reverse voltage up to 70V. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Improves ESD and transient robustness by suppressing edge leakage and preventing premature avalanche at junction periphery. |
| Lead-free, RoHS-compliant finish | Bright tin plating meets MIL-STD-202 solderability requirements and withstands 260°C/10s reflow without degradation. |
| Low thermal resistance (RJL = 15 K/W) | Enables direct thermal coupling to PCB copper; reduces junction temperature rise by ~15°C per watt vs. standard DO-41 parts. |
| High surge rating (25A IFSM) | Supports reliable operation during cold-start surges in offline power supplies and motor drive freewheeling paths. |
Applications
| AC/DC Adapter Rectification | DC Motor Freewheeling Clamp |
|---|---|
Use Scenario: Single-phase, half-wave rectification in wall-wart adapters supplying 5–12V DC outputs. IC Role / Device Role / Timing Role: Primary rectifier converting 60Hz AC to pulsating DC; placed between transformer secondary and bulk capacitor. Use Value: 0.80V VFM minimizes conduction loss and improves no-load efficiency; DO-41 form factor fits compact adapter PCBs. | Use Scenario: Flyback diode across brushed DC motor windings in battery-powered tools or actuators. IC Role / Device Role / Timing Role: Freewheeling path for inductive kickback energy during MOSFET turn-off. Use Value: Fast recovery (Schottky) prevents voltage overshoot >70V; 25A IFSM handles motor stall surges without failure. |
| Polarity Protection Circuit | USB Power Input Clamp |
Use Scenario: Reverse-voltage protection at main power input of industrial sensors or PLC modules. IC Role / Device Role / Timing Role: Series-connected anode-in configuration blocking reverse connection while passing forward current. Use Value: Low 0.80V drop preserves headroom in 3.3V/5V systems; –65°C to +125°C rating ensures outdoor deployment reliability. | Use Scenario: Input protection diode on USB Type-A power input (5V nominal) in portable medical devices. IC Role / Device Role / Timing Role: Clamps reverse polarity events and shunts ESD transients via guard ring structure. Use Value: Guard ring enhances system-level IEC 61000-4-2 ESD immunity; RoHS-compliant finish satisfies medical regulatory traceability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB170-A | Same electrical specs and DO-41 package; supplied in 5K ammo pack instead of tape-and-reel. | No functional difference; differs only in packaging format for manual vs. automated assembly. | Select SB170-A for prototyping or low-volume hand-soldered builds. |
| 1N5817 | Same 1A/20V rating but lower VRRM (20V vs. 70V); higher VFM (0.45V typical at 1A, but not guaranteed at 1.0A). | Not suitable for 48V or higher reverse-blocking applications; limited to ≤20V systems. | Choose only if system reverse voltage stays below 20V and tighter VFM tolerance is required. |
Compared with SB170-A, SB170-T offers identical performance with SMT-compatible tape-and-reel delivery; versus 1N5817, it provides triple the reverse voltage margin and verified 1.0A-rated VFM, making it appropriate for 36–72V industrial power rails where overvoltage transients occur.
Availability
SB170-T is available at Aetrix Electronics and suitable for AC/DC adapters, motor drive clamping, polarity protection circuits, and USB power input designs requiring stable component supply and long-term manufacturability.
Supply support for SB170-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 and manufacturing operations across Asia and the US.
The SBxx0 series targets cost-sensitive, high-volume power conversion applications requiring reliable Schottky performance in legacy through-hole packages, emphasizing thermal robustness and JEDEC-compliant surge endurance.
FAQ
What is the maximum allowable lead temperature for continuous operation?
The SB170-T is rated for 1.0A average forward current at a lead temperature (TT) of 85°C. Exceeding this temperature requires current derating per Figure 1 in the datasheet; at 100°C lead temperature, IO drops to approximately 0.85A. Thermal design must maintain leads at or below 85°C using adequate PCB copper area or airflow.
Is SB170-T suitable for use in a 48V automotive subsystem?
Yes - its 70V VRRM rating provides 22V overhead above 48V nominal, accommodating load dump transients up to ISO 7637-2 Pulse 5a (up to 60V). However, ensure junction temperature remains ≤125°C under worst-case ambient and power dissipation; RJA = 50K/W requires careful thermal layout in enclosed enclosures.
Does SB170-T have a specified reverse recovery time (trr)?
No - as a Schottky barrier rectifier, SB170-T has no minority carrier storage and therefore no defined reverse recovery time. Its switching is governed by junction capacitance (Cj = 80pF at 4V) and circuit inductance, enabling clean turn-off in high-frequency DC/DC converters without reverse recovery losses or ringing.
Can SB170-T replace SB1100-T in a 100V blocking application?
No - SB170-T has a 70V VRRM rating and will experience avalanche breakdown if subjected to ≥70V reverse bias. SB1100-T is rated for 100V VRRM and shares the same DO-41 package and thermal characteristics, but substituting SB170-T risks catastrophic failure in 100V circuits.
SB170-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):
- 70 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 800 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 70 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
- Operating Temperature - Junction:
- -65°C ~ 150°C
SB170-T FAQ
1.How can I place an order for SB170-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SB170-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 SB170-T reliable?
The price and inventory of SB170-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SB170-T is usually 5 days.
3.What payment methods are accepted for SB170-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SB170-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SB170-T?
SB170-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SB170-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 SB170-T?
For technical support, including SB170-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SB170-T requirements.
6.How does Aetrix verify that SB170-T is sourced from the original manufacturer or authorized distributors?
All SB170-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 SB170-T meets industry standards.
7.What is the process for return or replacement of SB170-T?
All SB170-T units undergo pre-shipment inspection (PSI). If there is an issue with SB170-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 SB170-T part is unused and in its original packaging.
Return procedure for SB170-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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