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Vishay General Semiconductor - Diodes Division SMAJ170CAHE3_A/I
- Part No.:
- SMAJ170CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170CAHE3_A/I.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,701
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Product details
Overview
SMAJ170CAHE3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients up to 275 V at 1.09 A peak pulse current, with 400 W peak pulse power (10/1000 μs), 170 V stand-off voltage, and 189–209 V breakdown voltage range - deployed for ESD and surge protection on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ170CAHE3_A/I datasheet, SMAJ170CAHE3_A/I pinout, SMAJ170CAHE3_A/I application, or SMAJ170CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 170 V working voltage margin, and compatibility with automated SMT assembly on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transient events: when reverse voltage exceeds 170 V (VWM), it avalanches between 189 V and 209 V (VBR min/max at 1 mA), limiting clamped voltage to ≤275 V (VC) at 1.09 A (IPPM). Its low incremental surge resistance and <1 ns response time ensure fast suppression of lightning-induced surges and inductive switching spikes.
Rated for -55 °C to +150 °C junction temperature, it delivers 3.3 W steady-state power dissipation (PD) and withstands 40 A non-repetitive forward surge (IFSM). The bidirectional symmetry eliminates polarity concerns in AC-coupled or floating signal paths, and its MSL Level 1 rating supports lead-free reflow up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 189 V / 209 V at 1 mA - guaranteed avalanche onset range defining turn-on threshold tolerance |
| VC @ IPPM | 275 V at 1.09 A - clamped voltage under standardized 10/1000 μs surge, directly limiting downstream stress |
| PPPM | 400 W (≤78 V); 300 W (>78 V) - peak transient energy handling capacity per JEDEC test waveform |
| ID @ VWM | 1.09 μA - leakage current at rated stand-off voltage, ensuring minimal standby power loss |
| TJ max. | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 0.208" length and matte tin-plated leads |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case meeting UL 94 V-0, with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional construction means no cathode/anode marking; terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Transient current entry point (bidirectional) | Accepts surge current in either polarity; connects to protected line or rail |
| Cathode (Terminal 2) | Transient current exit point (bidirectional) | Completes clamping path to ground or return; functionally identical to Terminal 1 in CA devices |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per JESD47 |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surge (4 kV/2 Ω) on 12 V systems with margin |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio TVS devices |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture-related popcorn failure |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamp |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply inputs in engine control units (ECUs) against load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between power rail and chassis ground. Use Value: Limits transient voltage to ≤275 V, preventing damage to MCU power supplies and CAN transceivers rated for 36 V absolute max. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) in factory-floor pressure sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance shunt protector across differential signal pair. Use Value: Sub-μA leakage at 170 V ensures no impact on loop accuracy; 1.09 A IPPM handles ±8 kV contact ESD per IEC 61000-4-2. |
| Telecom DC Feeder Protection | Consumer Appliance Motor Drive Snubbing |
|
Use Scenario: Safeguarding PoE-powered network switches against induced surges on 48 V DC feeder lines. IC Role / Device Role / Timing Role: Standoff-rated TVS parallel to input filter capacitor. Use Value: 170 V VWM provides >3× margin above 48 V nominal, while 275 V VC prevents latch-up in upstream DC-DC controllers. |
Use Scenario: Suppressing flyback spikes from brushed DC motors in smart home vacuum cleaners. IC Role / Device Role / Timing Role: Bidirectional snubber across motor terminals. Use Value: Fast <1 ns response captures commutation spikes before MOSFET drain-source breakdown; SMA package fits tight board space near motor connector. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170CA-M3 | Halogen-free, RoHS-compliant, commercial grade (non-AEC-Q101) | Lacks automotive qualification; suitable for industrial/commercial designs without AEC requirements | Select when AEC-Q101 is not mandated and halogen-free compliance is prioritized |
| SMBJ170CAHE3_A/I | Same electrical specs but SMB (DO-214AA) package - 2.5 mm wider, 0.3 mm taller, 2× thermal resistance (RθJA = 240 °C/W) | Lower power derating above 25 °C; requires larger PCB pad area for equivalent thermal performance | Choose only if existing layout uses SMB footprint and thermal margin permits reduced PPPM at elevated TA |
Compared with SMAJ170CAHE3_A/I, SMAJ170CA-M3 offers identical clamping performance without automotive qualification, while SMBJ170CAHE3_A/I trades compact SMA size for lower surge density and inferior thermal management - making SMAJ170CAHE3_A/I optimal for space-constrained, thermally demanding AEC-Q101 applications.
Availability
SMAJ170CAHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom DC power system prototyping requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ170CAHE3_A/I 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-efficiency solutions.
The SMAJ series targets robust transient suppression in harsh environments - engineered specifically for automotive, industrial, and telecom applications where AEC-Q101 validation, precise clamping, and automated assembly compatibility are mandatory.
FAQ
What does the "CA" suffix indicate in SMAJ170CAHE3_A/I?
The "CA" suffix denotes a bidirectional configuration: SMAJ170CAHE3_A/I conducts and clamps symmetrically in both polarities, unlike unidirectional "A" variants that require correct cathode orientation. This makes SMAJ170CAHE3_A/I ideal for AC-coupled lines, floating grounds, or differential signals where polarity cannot be guaranteed - and eliminates risk of incorrect placement during automated assembly.
Is SMAJ170CAHE3_A/I suitable for IEC 61000-4-5 surge testing?
Yes - SMAJ170CAHE3_A/I is rated for 400 W peak pulse power with a 10/1000 μs waveform, which covers IEC 61000-4-5 Level 4 (4 kV line-to-ground, 2 Ω source impedance) on 12 V systems. Its 275 V clamping voltage at 1.09 A ensures protected circuitry remains within safe operating limits during standardized surge events, provided PCB layout follows Vishay's recommended 0.2" × 0.2" copper pad guidelines.
How does the HE3 suffix affect the qualification status of SMAJ170CAHE3_A/I?
The "HE3" suffix confirms SMAJ170CAHE3_A/I is RoHS-compliant and AEC-Q101 qualified - meaning it has passed rigorous automotive stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD robustness. This distinguishes it from commercial-grade variants (e.g., SMAJ170CA-E3) and validates its use in under-hood, infotainment, and ADAS modules where zero-defect reliability is required.
What is the thermal resistance of SMAJ170CAHE3_A/I, and how does it impact layout?
SMAJ170CAHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value assumes minimum recommended pad layout; reducing pad size or omitting thermal vias increases RθJA, causing junction temperature to rise faster under repetitive surges. For sustained operation near PD = 3.3 W, designers must verify TJ stays below 150 °C using actual board thermal modeling.
Can SMAJ170CAHE3_A/I replace SMAJ150CAHE3_A/I in an existing design?
SMAJ170CAHE3_A/I can replace SMAJ150CAHE3_A/I only if the protected circuit's maximum transient voltage exceeds 150 V but remains below 170 V VWM - for example, upgrading from 120 V nominal bus to 160 V HV auxiliary supply. However, its higher VBR (189–209 V vs. 167–185 V) delays clamping onset, potentially exposing downstream components to longer overvoltage duration; verify timing margins and clamping energy absorption in the target application before substitution.
SMAJ170CAHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- 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):
- 1.09A
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ170CAHE3_A/I FAQ
1.How can I place an order for SMAJ170CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170CAHE3_A/I 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 SMAJ170CAHE3_A/I reliable?
The price and inventory of SMAJ170CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ170CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ170CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170CAHE3_A/I?
SMAJ170CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170CAHE3_A/I 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 SMAJ170CAHE3_A/I?
For technical support, including SMAJ170CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ170CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ170CAHE3_A/I 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 SMAJ170CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ170CAHE3_A/I?
All SMAJ170CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170CAHE3_A/I, 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 SMAJ170CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ170CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ170CAHE3_A/I Tags
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