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Vishay General Semiconductor - Diodes Division SMBJ170A-M3/5B
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- Part No.:
- SMBJ170A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ170A-M3/5B.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,730
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Product details
Overview
SMBJ170A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power rails and signal lines. It features a 170 V standoff voltage (VWM), 189–209 V breakdown range (VBR at 1 mA), 275 V maximum clamping voltage (VC) at 2.2 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives, telecom power supplies, and automotive ECUs.
For engineers reviewing the SMBJ170A-M3/5B datasheet, SMBJ170A-M3/5B pinout, SMBJ170A-M3/5B application, or SMBJ170A-M3/5B equivalent, key selection criteria include clamping performance under 2.2 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, SMB (DO-214AA) package compatibility, and halogen-free RoHS compliance per M3 suffix.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 170 V, it avalanches into low-impedance conduction to divert transients away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown and fast response (<1 ps), while the unidirectional configuration provides forward conduction path only during positive surges on the anode side.
Designed for placement directly across protected nodes (e.g., DC input to DC-DC converter), SMBJ170A-M3/5B sustains repetitive 600 W pulses at 0.01% duty cycle and handles 100 A non-repetitive forward surge (8.3 ms half-sine). Junction temperature is rated from –55 °C to +150 °C, with thermal resistance from junction-to-lead (RθJL) at 20 °C/W enabling localized heat dissipation through PCB copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR (min/max) | 189 V / 209 V at IT = 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above system nominal voltage. |
| VC @ IPPM | 275 V at 2.2 A - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected device. |
| PPPM | 600 W - Peak pulse power handling capability; validates protection against IEC 61000-4-5 Level 4 surges (4 kV open-circuit). |
| IFSM | 100 A - Non-repetitive forward surge rating (8.3 ms); supports protection during inrush or load-dump events in automotive systems. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
| Package | SMB (DO-214AA) - Surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, M3 suffix denotes halogen-free and RoHS-compliant commercial grade.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to lower-potential side of protected node (e.g., GND or return rail); completes conduction path during overvoltage. |
| Cathode | Reverse-biased terminal / Clamping node | Marked with band; connected to higher-potential side (e.g., +170 V rail); avalanches when VAK > VBR to clamp transient. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against severe lightning-induced surges per IEC 61000-4-5 without external series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes voltage overshoot during clamping - critical for safeguarding 200 V-rated MOSFETs or SiC drivers. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage (<1 µA at VWM) across temperature and lifetime stress. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| Halogen-free, RoHS-compliant (M3 suffix) | Fulfills environmental compliance for industrial and automotive end equipment without compromising electrical performance. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of DC bus inputs against switching transients from IGBT gate drive coupling or regenerative braking energy. IC Role / Device Role / Timing Role: Shunt TVS placed across +375 V DC bus to clamp voltage spikes up to 275 V during fault conditions. Use Value: Prevents destructive overvoltage on 400 V-rated electrolytic capacitors and gate drivers by limiting bus excursion within safe margin. |
Use Scenario: Input-stage surge suppression on –48 V telecom rectifier outputs exposed to induced surges on long distribution lines. IC Role / Device Role / Timing Role: Unidirectional clamping device tied between –48 V rail and chassis ground to absorb common-mode transients. Use Value: Maintains output regulation integrity during 2 kV/0.5 Ω combination wave surges without latch-up or degradation. |
| Automotive Body Control Modules | Industrial PLC I/O Terminals |
|
Use Scenario: Load-dump protection on 12 V supply lines feeding microcontrollers and CAN transceivers in BCMs. IC Role / Device Role / Timing Role: Primary clamping element on battery feed, triggered by ISO 7637-2 Pulse 5a (120 V, 400 ms) events. Use Value: Limits voltage at MCU VCC pin to ≤275 V during 120 V transients, preventing latch-up or permanent damage. |
Use Scenario: Field-side protection on 24 V digital input modules subjected to inductive kickback from solenoid coils. IC Role / Device Role / Timing Role: Reverse-biased TVS across input optocoupler terminals to clamp flyback spikes before isolation barrier. Use Value: Extends optocoupler lifetime by reducing reverse stress on LED anode-cathode junction during coil de-energization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170A-E3/5B | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs M3). | Preferred for commercial-grade non-automotive designs where halogen content is unrestricted. | Select E3 for cost-sensitive consumer applications; M3 required for halogen-free mandates (e.g., EU EcoDesign). |
| SMCJ170A-M3 | Higher 1500 W PPPM, larger SMC (DO-214AB) package, same VWM/VC. | Suitable for higher-energy surge environments (e.g., outdoor telecom cabinets) requiring greater margin. | Choose SMCJ170A-M3 when 600 W is insufficient; verify PCB pad layout and thermal mass accommodate larger footprint. |
Compared with SMBJ170A-E3/5B, the M3 version adds halogen-free compliance without trade-offs in clamping or surge rating; versus SMCJ170A-M3, SMBJ170A-M3/5B offers identical protection in a 30% smaller footprint and lower RθJA, ideal for space-constrained 24–170 V rail protection.
Availability
SMBJ170A-M3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and PLC I/O terminals requiring stable component supply with full traceability and lifecycle management.
Supply support for SMBJ170A-M3/5B 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and ruggedized packaging.
The SMBJ series targets high-reliability transient suppression in harsh environments - engineered for consistent clamping performance, low leakage, and AEC-Q101 qualification readiness across voltage grades.
FAQ
What is the maximum clamping voltage of SMBJ170A-M3/5B under standard test conditions?
The SMBJ170A-M3/5B has a maximum clamping voltage (VC) of 275 V when subjected to its rated peak pulse current of 2.2 A using the 10/1000 µs waveform. This value is measured per JEDEC standards and reflects worst-case voltage seen by protected circuitry during surge events - critical for verifying margin against downstream device absolute maximum ratings.
Does SMBJ170A-M3/5B meet automotive qualification requirements?
The SMBJ170A-M3/5B itself is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the functionally identical SMBJ170AHM3_B/I variant with AEC-Q101 qualification. For automotive use, specify HM3 suffix and revision code (e.g., _B or _I) - the SMBJ170A-M3/5B is intended for industrial and telecom applications where AEC-Q101 is not mandated.
How does the M3 suffix affect the environmental compliance of SMBJ170A-M3/5B?
The M3 suffix on SMBJ170A-M3/5B indicates halogen-free, RoHS-compliant construction per Vishay's material categorization standard. Unlike E3 variants, M3 devices contain no brominated flame retardants or chlorine-based compounds, satisfying strict environmental directives including JEDEC JESD201 Class 2 whisker resistance and UL 94 V-0 flammability rating.
Can SMBJ170A-M3/5B be used in bidirectional protection circuits?
No - SMBJ170A-M3/5B is strictly unidirectional, with polarity marked by a cathode band. For bidirectional protection, Vishay specifies the CA-suffixed variant (e.g., SMBJ170CA). Using SMBJ170A-M3/5B in reverse-biased AC applications risks catastrophic failure due to lack of symmetrical breakdown capability.
What is the thermal resistance and recommended mounting for SMBJ170A-M3/5B?
SMBJ170A-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain reliability under repetitive surges, ensure minimum pad area per datasheet Fig. 2, avoid thermal vias under the body, and limit ambient temperature per derating curves - junction temperature must stay below 150 °C.
SMBJ170A-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 275V
- Current - Peak Pulse (10/1000µs):
- 2.2A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ170A-M3/5B FAQ
1.How can I place an order for SMBJ170A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ170A-M3/5B 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 SMBJ170A-M3/5B reliable?
The price and inventory of SMBJ170A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ170A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ170A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ170A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ170A-M3/5B?
SMBJ170A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ170A-M3/5B 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 SMBJ170A-M3/5B?
For technical support, including SMBJ170A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ170A-M3/5B requirements.
6.How does Aetrix verify that SMBJ170A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ170A-M3/5B 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 SMBJ170A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ170A-M3/5B?
All SMBJ170A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ170A-M3/5B, 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 SMBJ170A-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ170A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ170A-M3/5B Tags
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