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Vishay General Semiconductor - Diodes Division SMBJ170CA-E3/5B
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- Part No.:
- SMBJ170CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ170CA-E3/5B.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,585
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Product details
Overview
SMBJ170CA-E3/5B from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 170 V stand-off voltage (VWM), 189–209 V breakdown voltage (VBR) at 1 mA, 275 V maximum clamping voltage (VC) at 2.2 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom line cards.
For engineers reviewing the SMBJ170CA-E3/5B datasheet, SMBJ170CA-E3/5B pinout, SMBJ170CA-E3/5B application, or SMBJ170CA-E3/5B equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, thermal derating curves, JEDEC-compliant SMB package dimensions, and AEC-Q101-qualified alternatives - all critical for surge protection layout validation and IEC 61000-4-5 compliance design.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (189–209 V), VC (275 V), and IPPM (2.2 A) in either direction. Its low incremental surge resistance and sub-nanosecond response time enable effective suppression of ESD, lightning-induced surges, and inductive switching transients without affecting normal circuit operation.
The device uses a glass-passivated silicon junction and is rated for TJ = –55 °C to +150 °C. Thermal resistance is RθJA = 100 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 20 °C/W, supporting reliable operation under repetitive surge conditions at ≤0.01% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR (min/max) | 189 V / 209 V at IT = 1 mA - Confirmed bidirectional breakdown threshold; ensures consistent clamping onset across polarity. |
| VC @ IPPM | 275 V at IPPM = 2.2 A (10/1000 µs) - Clamped voltage seen by protected circuit during worst-case surge; limits stress on downstream components. |
| PPPM | 600 W - Peak transient energy handling capacity; validates suitability for IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge testing. |
| ID @ VWM | 1.0 µA - Reverse leakage at stand-off voltage; negligible power loss and signal integrity impact in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in enclosed industrial enclosures or near heat sources. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow. |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, with MSL level 1 rating (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge path | Both terminals function identically; connects across protected line and return (e.g., RS-485 A/B, DC bus ±) without orientation constraint. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates robustness against 4 kV IEC 61000-4-5 surges on 50 Ω/42 Ω coupling networks in telecom and industrial equipment. |
| 275 V clamping voltage at 2.2 A | Limits transient overvoltage to <1.6× VWM, protecting 200 V-rated MOSFETs and gate drivers without derating headroom loss. |
| Low 1.0 µA leakage at 170 V | Enables use on high-impedance sensor bias rails or battery-backed lines without measurable standby current penalty. |
| MSL Level 1, 260 °C peak reflow | Eliminates pre-baking requirement; supports standard lead-free reflow profiles in high-volume SMT assembly. |
| AEC-Q101 qualified option available | HE3/HM3 variants meet automotive-grade reliability for under-hood power modules and ADAS sensor interfaces. |
Applications
| Industrial Power Supply Input Protection | Telecom Line Card Surge Suppression |
|---|---|
|
Use Scenario: Protecting AC/DC front-end rectifiers and bulk capacitors from lightning-induced surges on 24–48 V DC distribution lines. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed across input terminals to divert >1 kA transients before they reach upstream bridge rectifier or PFC controller. Use Value: Maintains system uptime by preventing catastrophic failure of primary-side MOSFETs and electrolytic capacitors during outdoor cabinet exposure. |
Use Scenario: Safeguarding RS-485 transceivers and isolation amplifiers on base station backhaul interface cards exposed to induced surges from nearby antenna cables. IC Role / Device Role / Timing Role: Differential-line TVS mounted across A/B bus lines to clamp common-mode transients while preserving signal integrity up to 10 Mbps. Use Value: Prevents data corruption and transceiver latch-up during field-deployed maintenance events without requiring additional common-mode chokes. |
| Automotive Body Control Module (BCM) Power Rail | Industrial Sensor Signal Conditioning |
|
Use Scenario: Securing 12 V supply inputs to BCM microcontrollers and CAN transceivers against load-dump and jump-start transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Primary clamping device on main VBAT rail, coordinated with upstream fuse and secondary LC filter to limit peak clamped voltage to <35 V. Use Value: Enables single-stage protection architecture meeting OEM requirements without cascaded TVS or active crowbar circuits. |
Use Scenario: Shielding 4–20 mA current loop transmitter outputs and analog sensor inputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation PLCs. IC Role / Device Role / Timing Role: Low-leakage bidirectional clamp installed at connector entry point to absorb ±8 kV contact ESD per IEC 61000-4-2 without perturbing loop calibration. Use Value: Eliminates need for series resistors or RC filters that degrade loop accuracy and bandwidth in precision measurement systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170CA-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | No difference in circuit performance; selected where halogen-free material compliance is mandated (e.g., EU public infrastructure projects). | Direct drop-in replacement for SMBJ170CA-E3/5B when halogen-free bill-of-materials is required. |
| SMBJ170AHE3_B/I | AEC-Q101 qualified, RoHS-compliant, same VWM/VBR/VC but validated for automotive temperature cycling and humidity testing. | Required for under-hood or chassis-mounted applications where extended lifetime and zero-failure reliability are enforced by OEM specifications. | Preferred for automotive designs needing qualification evidence; not recommended for cost-sensitive commercial applications without AEC mandate. |
Compared with SMBJ170CA-E3/5B, the M3/5B offers identical protection performance with halogen-free packaging, while the HE3_B/I adds AEC-Q101 validation for automotive deployment - enabling selection based on compliance tier rather than functional trade-offs.
Availability
SMBJ170CA-E3/5B is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, automotive body control modules, and sensor signal conditioning circuits requiring stable component supply and full traceability.
Supply support for SMBJ170CA-E3/5B 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 high-reliability, high-power, and automotive-grade solutions.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and automotive subsystems where surge immunity and long-term stability are non-negotiable.
FAQ
What is the clamping voltage of SMBJ170CA-E3/5B at its rated peak pulse current?
The SMBJ170CA-E3/5B has a maximum clamping voltage (VC) of 275 V when subjected to its specified peak pulse current (IPPM) of 2.2 A using the 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and reflects the upper voltage limit imposed on protected circuitry during surge events. The SMBJ170CA-E3/5B maintains this clamping performance bidirectionally, ensuring consistent protection regardless of transient polarity.
Is SMBJ170CA-E3/5B suitable for automotive applications?
The SMBJ170CA-E3/5B itself is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the pin-compatible SMBJ170AHE3_B/I variant which meets AEC-Q101 requirements for temperature cycling, humidity, and mechanical shock. For automotive body control modules or infotainment power rails requiring qualification evidence, SMBJ170AHE3_B/I is the appropriate choice - while SMBJ170CA-E3/5B remains valid for non-automotive industrial use cases where qualification is not mandated.
How does the bidirectional nature of SMBJ170CA-E3/5B affect PCB layout?
The SMBJ170CA-E3/5B has no polarity marking and functions identically in both directions, simplifying PCB layout by eliminating orientation constraints during placement. It can be mounted across any two nodes requiring symmetrical surge protection - such as differential signal pairs (RS-485, CAN) or DC supply rails - without concern for anode/cathode alignment. This reduces assembly errors and supports automated optical inspection (AOI) without polarity verification steps.
What is the thermal resistance of SMBJ170CA-E3/5B, and how does it impact power dissipation?
The SMBJ170CA-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per JEDEC standards, and junction-to-lead resistance (RθJL) of 20 °C/W. These values define safe operating limits: at ambient temperatures above 25 °C, the 5.0 W steady-state power dissipation (PD) must be derated linearly per Figure 2 in the datasheet. For sustained surge duty cycles >0.01%, board-level thermal management becomes critical to avoid exceeding TJ max. of +150 °C.
Can SMBJ170CA-E3/5B replace unidirectional TVS diodes like SMBJ170A in existing designs?
No - SMBJ170CA-E3/5B is strictly bidirectional and cannot substitute for unidirectional types like SMBJ170A in circuits relying on DC forward conduction or polarity-specific clamping. Unidirectional devices conduct only during negative transients (cathode-to-anode), whereas SMBJ170CA-E3/5B clamps equally on both polarities. Substitution would cause unintended conduction during normal positive DC bias, risking short-circuit or latch-up. Always verify circuit topology and transient polarity requirements before selecting CA (bidirectional) vs. A (unidirectional) variants.
SMBJ170CA-E3/5B 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ170CA-E3/5B FAQ
1.How can I place an order for SMBJ170CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ170CA-E3/5B 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 SMBJ170CA-E3/5B reliable?
The price and inventory of SMBJ170CA-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ170CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ170CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ170CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ170CA-E3/5B?
SMBJ170CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ170CA-E3/5B 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 SMBJ170CA-E3/5B?
For technical support, including SMBJ170CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ170CA-E3/5B requirements.
6.How does Aetrix verify that SMBJ170CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ170CA-E3/5B 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 SMBJ170CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ170CA-E3/5B?
All SMBJ170CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ170CA-E3/5B, 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 SMBJ170CA-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ170CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ170CA-E3/5B Tags
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