My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ170CAHM3_A/I
- Part No.:
- SMAJ170CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170CAHM3_A/I.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,360
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ170CAHM3_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 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 1.09 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform) - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMAJ170CAHM3_A/I datasheet, SMAJ170CAHM3_A/I pinout, SMAJ170CAHM3_A/I application, or SMAJ170CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (via HM3 suffix), 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT assembly on standard PCB copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, delivering symmetrical reverse/forward conduction for bidirectional transient suppression. Its glass-passivated junction ensures stable VBR tolerance and fast response time (<1 ns), while the SMA package supports high thermal dissipation via 30 °C/W junction-to-lead resistance.
The SMAJ170CAHM3_A/I is rated for 400 W peak pulse power below 78 V and 300 W above 78 V per JEDEC JESD22-A114, with derating above 25 °C ambient per Fig. 2. It meets MSL Level 1 per J-STD-020 and is halogen-free, RoHS-compliant, and qualified to AEC-Q101 for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 170 V - Maximum continuous reverse voltage before significant leakage; defines operating margin before clamping activation. |
| VBR (Breakdown Voltage) | 189–209 V at 1 mA - Ensures reliable, repeatable avalanche initiation across production lots and temperature range. |
| VC (Clamping Voltage) | 275 V at IPPM = 1.09 A - Limits downstream voltage stress during ESD or lightning-induced surges. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Supports robust protection against IEC 61000-4-5 surge events up to specified energy level. |
| ID (Reverse Leakage) | 1.0 μA at VWM - Minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max. | 150 °C - Enables operation in under-hood automotive and industrial environments without thermal shutdown. |
| Package | SMA (DO-214AC) - Standardized SMT footprint compatible with IPC-7351B land patterns and reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional - no polarity marking; symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically in bidirectional mode; connects across protected line and ground or between differential lines. |
| Cathode Band (absent) | Polarity indicator | Not present - confirms bidirectional construction; eliminates risk of incorrect orientation during placement. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
| Halogen-free & RoHS-compliant | Meets EU RoHS Directive 2011/65/EU and JEDEC JS709E; supports environmentally regulated supply chains. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/85 % RH; enables direct placement without baking or dry-pack handling. |
| 400 W peak pulse power (≤78 V) | Provides higher surge margin than standard 300 W TVS devices for critical power rail protection. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V/5 V logic and automotive CAN/LIN interfaces. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (ISO 7637-2 Pulse 5a) on 12 V battery-fed ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between power input and ground, responding within <1 ns to limit voltage to ≤275 V. Use Value: Prevents latch-up or permanent damage to microcontrollers and power management ICs during alternator regulation faults. |
Use Scenario: Guarding analog outputs of pressure/temperature sensors against ESD (IEC 61000-4-2 ±8 kV contact). IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) shunt clamp on sensor output line, activated only during overvoltage events. Use Value: Maintains signal integrity during normal operation while diverting >1 A surge current away from precision ADC inputs. |
| Telecom Line Surge Protection | Consumer Device USB Port Protection |
|
Use Scenario: Protecting RS-485 transceivers on outdoor telecom node backhaul links exposed to induced lightning surges. IC Role / Device Role / Timing Role: Differential-mode TVS pair (two SMAJ170CAHM3_A/I) across A/B lines, clamping common-mode transients to ground. Use Value: Withstands 300 W surge energy (10/1000 μs) without degradation, preserving data link uptime in harsh field deployments. |
Use Scenario: Safeguarding USB 2.0 D+/D− lines in portable medical monitors against user-handling ESD. IC Role / Device Role / Timing Role: Bidirectional shunt suppressor mounted adjacent to connector, leveraging fast response to limit voltage to <275 V. Use Value: Complies with IEC 61000-4-2 Level 4 (±15 kV air) while adding <0.5 mm² PCB area - ideal for space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170CAHE3_A/I | Same electrical specs, but RoHS-compliant commercial grade (not halogen-free or AEC-Q101 qualified). | Lacks automotive qualification and halogen-free certification; suitable for industrial/commercial use only. | Select when AEC-Q101 and halogen-free requirements are not mandated. |
| SMBJ170CAHM3_A/I | Same VWM/VBR/VC ratings, but SMB (DO-214AA) package - 2.5× larger footprint and 600 W PPPM rating. | Higher surge capacity and thermal mass; requires larger PCB pad layout and may not fit tight spaces. | Choose when higher 600 W surge margin is required and board space permits SMB footprint. |
Compared with SMAJ170CAHM3_A/I, the HE3 variant trades automotive qualification for lower cost in non-automotive systems, while the SMBJ170CAHM3_A/I offers greater surge robustness at the expense of PCB area - making SMAJ170CAHM3_A/I the optimal balance of AEC-Q101 compliance, halogen-free content, and compact SMA packaging.
Availability
SMAJ170CAHM3_A/I is available at Aetrix Electronics and suitable for automotive control units, industrial sensor nodes, telecom infrastructure equipment, and consumer portable devices requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ170CAHM3_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 reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and telecom systems - delivering consistent clamping performance across temperature, lifetime, and surge repetition rates.
FAQ
What does the "HM3" suffix indicate in SMAJ170CAHM3_A/I?
The HM3 suffix in SMAJ170CAHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. This means the device meets automotive-grade reliability standards, contains no brominated flame retardants or chlorine-based compounds, and is approved for use in safety-critical vehicle subsystems such as body control modules and ADAS sensors.
Is SMAJ170CAHM3_A/I unidirectional or bidirectional?
SMAJ170CAHM3_A/I is a bidirectional TVS diode, as confirmed by the "CA" designation in its part number and absence of cathode band marking. It provides symmetrical clamping in both polarities - essential for protecting AC-coupled lines, differential buses like RS-485, and floating sensor outputs where voltage polarity reversal may occur.
What is the maximum clamping voltage of SMAJ170CAHM3_A/I under surge conditions?
The maximum clamping voltage (VC) of SMAJ170CAHM3_A/I is 275 V at a peak pulse current (IPPM) of 1.09 A, measured with a 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and ensures downstream components experience no more than 275 V during standardized surge events.
Can SMAJ170CAHM3_A/I be used in place of SMAJ170A (unidirectional)?
No - SMAJ170CAHM3_A/I is bidirectional and lacks polarity marking, whereas SMAJ170A is unidirectional with a cathode band. Substituting them requires circuit review: SMAJ170CAHM3_A/I may be used on AC or floating lines, but cannot replace SMAJ170A in DC-biased applications where forward conduction must be blocked in one direction.
What PCB pad layout is recommended for SMAJ170CAHM3_A/I?
Vishay specifies mounting SMAJ170CAHM3_A/I on 0.2" x 0.2" (5.0 mm x 5.0 mm) copper pads per terminal to achieve rated 400 W peak pulse power. The SMA (DO-214AC) outline drawing shows 0.074" (1.88 mm) max body width and 0.208" (5.28 mm) max length - land patterns must follow IPC-7351B generic SMA recommendations with thermal relief for solderability.
SMAJ170CAHM3_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:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ170CAHM3_A/I FAQ
1.How can I place an order for SMAJ170CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170CAHM3_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 SMAJ170CAHM3_A/I reliable?
The price and inventory of SMAJ170CAHM3_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 SMAJ170CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ170CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170CAHM3_A/I?
SMAJ170CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170CAHM3_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 SMAJ170CAHM3_A/I?
For technical support, including SMAJ170CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ170CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ170CAHM3_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 SMAJ170CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ170CAHM3_A/I?
All SMAJ170CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170CAHM3_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 SMAJ170CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ170CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ170CAHM3_A/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
