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Vishay General Semiconductor - Diodes Division SMAJ170-E3/61
- Part No.:
- SMAJ170-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170-E3/61.pdf
- Description:
- TVS DIODE 170VWM 304VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,126
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Product details
Overview
SMAJ170-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features 170 V stand-off voltage (VWM), 304 A peak pulse current (IPPM) at 10/1000 µs waveform, and 304 V maximum clamping voltage (VC) - enabling robust protection of 150 V-rated circuits against lightning-induced surges and inductive switching spikes in industrial power supplies and automotive ECUs.
For engineers reviewing the SMAJ170-E3/61 datasheet, SMAJ170-E3/61 pinout, SMAJ170-E3/61 application, or SMAJ170-E3/61 equivalent, this device delivers verified 400 W peak pulse power (derated to 300 W above 78 V), low 0.99 µA reverse leakage at VWM, and MSL Level 1 moisture sensitivity - critical for high-reliability automated SMT assembly and long-term field operation under thermal cycling.
Technical Context
This unidirectional TVS diode operates by avalanche breakdown when reverse voltage exceeds its 189–231 V breakdown range (VBR at 1 mA), clamping transient energy within nanoseconds. Its glass-passivated junction ensures stable VBR tolerance and low dynamic impedance, while the DO-214AC package provides 120 °C/W junction-to-ambient thermal resistance on standard 5.0 × 5.0 mm copper pads.
The device sustains 40 A non-repetitive forward surge current (IFSM) for 8.3 ms half-sine waves and operates across –55 °C to +150 °C junction temperature range. Its 1.0 µA max reverse leakage at 170 V stand-off supports low-power sensor line protection without compromising signal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 150 V DC bus systems. |
| VC @ IPPM | 304 V - Clamped voltage during 304 A 10/1000 µs surge; limits downstream IC stress to <304 V under worst-case transient. |
| IPPM | 304 A - Peak surge current capability with 10/1000 µs waveform; validates compliance with IEC 61000-4-5 Level 4 (4 kV/2 Ω) |
| PPPM | 400 W - Peak pulse power rating below 78 V; derates to 300 W at 170 V, confirming sustained surge handling in high-voltage rails. |
| ID @ VWM | 0.99 µA - Reverse leakage at 170 V; negligible loading on high-impedance control/sensor inputs. |
| TJ Range | –55 °C to +150 °C - Full operational junction temperature range; supports under-hood automotive and industrial ambient conditions. |
| Package | DO-214AC (SMA) - Standard surface-mount outline with cathode band marking; compatible with JEDEC MS-013 and IPC-7351B footprint. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, 0.208" × 0.157" body, cathode band denoting terminal 1. Compliant with UL 94 V-0 flammability rating and J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry / transient return path | Connected to protected line's low-side reference; completes clamping loop during overvoltage events. |
| Cathode (banded end) | Avalanche breakdown node / clamping output | Connected to system ground or common rail; sinks surge current into ground plane with minimal VC overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Validates immunity to IEC 61000-4-5 surge test waveforms up to 4 kV open-circuit voltage in 2 Ω source impedance configurations. |
| Glass-passivated junction | Ensures ±5 % VBR tolerance stability over 1000-hour HTOL testing and prevents parameter drift in humid environments. |
| MSL Level 1 (260 °C reflow) | Enables single-pass lead-free reflow without popcorn cracking or delamination - eliminates pre-bake requirements for production lines. |
| RoHS-compliant & JESD201 Class 1A whisker resistant | Guarantees long-term reliability in vibration-prone automotive modules and industrial controllers without tin whisker growth risk. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns rise time), protecting sensitive gate drivers and ADC front-ends. |
Applications
| Industrial Power Supply Input Protection | Automotive Engine Control Unit (ECU) CAN Bus Line Protection |
|---|---|
Use Scenario: Suppresses load-dump transients (up to 120 V, 400 ms) and alternator ripple on 24 V DC input rails of PLC power modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp positive-going surges before they reach upstream DC/DC converters. Use Value: Limits voltage seen by primary-side MOSFETs and controller ICs to ≤304 V, preventing catastrophic failure during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shields high-speed CAN FD transceivers (e.g., TJA1044) from ESD and coupled noise on vehicle battery-supplied CAN_H/CAN_L lines. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices (SMAJ170-E3/61 on CAN_H, SMAJ170A-E3/61 on CAN_L) referenced to ground. Use Value: Maintains signal integrity with <1.0 µA leakage at 170 V, while clamping ESD pulses (IEC 61000-4-2 ±25 kV) within 1 ns response window. |
| Telecom AC/DC Adapter Surge Protection | Renewable Energy Inverter DC Link Snubbing |
Use Scenario: Protects secondary-side rectifier outputs and feedback optocouplers in offline 48 V telecom adapters subjected to lightning-induced surges on AC mains. IC Role / Device Role / Timing Role: Mounted across transformer secondary winding output to clamp flyback voltage spikes during MOSFET turn-off. Use Value: Withstands 304 A peak current and dissipates 400 W transient energy without degradation, extending adapter MTBF beyond 10 years. |
Use Scenario: Absorbs commutation spikes generated by IGBT switching in 600 V DC-link inverters used in solar microinverters and wind turbine converters. IC Role / Device Role / Timing Role: Connected between DC+ and DC− bus rails to limit voltage overshoot during rapid IGBT turn-off transitions. Use Value: Clamps 600 V nominal bus to ≤304 V peak during 1 µs dV/dt events, preventing IGBT desaturation and gate oxide damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170A-E3/61 | Bidirectional variant with symmetric clamping in both polarities; same VWM (170 V), but VC = 275 V and IPPM = 335 A. | Required where bidirectional transients occur (e.g., AC-coupled data lines, transformer-isolated interfaces). | Select SMAJ170A-E3/61 only if protection against negative-going surges is needed; SMAJ170-E3/61 is optimal for DC rails with defined polarity. |
| SMCJ170A-E3/57T | Higher-power SMC package (DO-214AB); same VWM (170 V), but PPPM = 1500 W and VC = 277 V at 1010 A IPPM. | Suitable for main AC input stages or high-energy industrial motor drives requiring >1 kW surge handling. | Choose SMCJ170A-E3/57T only when PCB layout allows larger footprint and thermal mass; SMAJ170-E3/61 fits space-constrained secondary-side locations. |
Compared with SMAJ170A-E3/61 and SMCJ170A-E3/57T, SMAJ170-E3/61 offers the smallest footprint for 170 V unidirectional clamping, optimized for cost-sensitive, high-volume SMT assembly where 400 W surge capacity suffices and polarity is fixed.
Availability
SMAJ170-E3/61 is available at Aetrix Electronics and suitable for industrial power supply input protection, automotive ECU CAN bus line protection, telecom AC/DC adapter surge suppression, and renewable energy inverter DC link snubbing requiring stable component supply, full RoHS compliance, and MSL Level 1 reflow compatibility.
Supply support for SMAJ170-E3/61 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 high-reliability diodes, MOSFETs, and passive components for demanding industrial, automotive, and computing applications.
The SMAJ series is engineered specifically for surface-mount transient voltage suppression in space-constrained, high-surge environments - emphasizing low clamping voltage, repeatable avalanche performance, and automated assembly readiness.
FAQ
What is the clamping voltage of SMAJ170-E3/61 under a 10/1000 µs surge?
The SMAJ170-E3/61 clamps to a maximum of 304 V when subjected to its rated 304 A peak pulse current with a 10/1000 µs waveform. This value is measured per Fig. 1 and Fig. 3 in Vishay document 88390 and represents the upper limit of voltage imposed on protected circuitry during standardized surge events.
Is SMAJ170-E3/61 suitable for automotive applications?
Yes, SMAJ170-E3/61 meets AEC-Q101 requirements for high-reliability automotive use when ordered with the HE3 suffix (e.g., SMAJ170HE3/61). The base SMAJ170-E3/61 is commercial-grade but shares identical electrical specs and DO-214AC packaging - validated for under-hood ECU protection when paired with appropriate thermal design.
Does SMAJ170-E3/61 have polarity marking, and how is it oriented on PCB?
Yes, SMAJ170-E3/61 is unidirectional and features a cathode band on one end of the DO-214AC (SMA) package. During PCB layout, the banded end must connect to system ground or the lower-potential reference node, while the unmarked end connects to the line being protected - reversing polarity prevents clamping action.
What is the maximum reverse leakage current for SMAJ170-E3/61 at its stand-off voltage?
At 170 V stand-off voltage (VWM) and 25 °C ambient, SMAJ170-E3/61 exhibits a maximum reverse leakage current of 0.99 µA. This ultra-low leakage ensures minimal power loss and no measurable loading on high-impedance sensor or feedback circuits.
Can SMAJ170-E3/61 be used in place of SMAJ170A-E3/61?
No - SMAJ170-E3/61 is unidirectional and cannot replace the bidirectional SMAJ170A-E3/61 in applications requiring symmetrical clamping (e.g., AC signal lines or transformer-coupled interfaces). Substitution would leave negative-going transients unprotected and may cause catastrophic failure.
SMAJ170-E3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 304V
- Current - Peak Pulse (10/1000µs):
- 990mA
- Power - Peak Pulse:
- 300W
- 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-214AC (SMA)
SMAJ170-E3/61 FAQ
1.How can I place an order for SMAJ170-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170-E3/61 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 SMAJ170-E3/61 reliable?
The price and inventory of SMAJ170-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ170-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ170-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170-E3/61?
SMAJ170-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170-E3/61 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 SMAJ170-E3/61?
For technical support, including SMAJ170-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170-E3/61 requirements.
6.How does Aetrix verify that SMAJ170-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ170-E3/61 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 SMAJ170-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ170-E3/61?
All SMAJ170-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170-E3/61, 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 SMAJ170-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ170-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ170-E3/61 Tags
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