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Vishay General Semiconductor - Diodes Division SMAJ170AHM3/H
- Part No.:
- SMAJ170AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170AHM3/H.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,130
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Product details
Overview
SMAJ170AHM3/H from Vishay General Semiconductor is a unidirectional 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, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and automotive ECUs.
For engineers reviewing the SMAJ170AHM3/H datasheet, SMAJ170AHM3/H pinout, SMAJ170AHM3/H application, or SMAJ170AHM3/H equivalent, key selection criteria include verified clamping performance at rated surge current, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its specified VBR range (189–209 V). Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.09 μA at VWM), while the SMA package supports high surge robustness with 40 A IFSM rating and 150 °C max junction temperature.
The device delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, per Fig. 2 of the datasheet. Its fast response time (<1 ns) and low incremental surge resistance enable effective suppression of ESD, lightning-induced surges, and inductive switching transients in DC power rails and analog signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for protected circuitry. |
| VBR min/max | 189 V / 209 V at 1 mA - Confirmed avalanche breakdown range; ensures predictable turn-on under transient overvoltage conditions. |
| VC @ IPPM | 275 V at 1.09 A - Measured clamping voltage during 10/1000 μs surge; determines worst-case voltage stress on downstream components. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power handling capability; defines transient energy absorption capacity per standard waveform. |
| ID @ VWM | ≤1.09 μA - Reverse leakage current at stand-off voltage; critical for low-power sensor and battery-backed circuits. |
| TJ max | +150 °C - Maximum junction temperature; sets thermal design limits for PCB pad layout and ambient operating envelope. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on minimum recommended pad; informs heatsinking requirements for repetitive surge duty. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C reflow peak), matte tin-plated leads. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward-biased surge events (rare in typical TVS use). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., +12 V rail); avalanche breakdown initiates here when voltage exceeds VBR, shunting surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - enables use in engine control and ADAS modules. |
| Halogen-free & RoHS-compliant (HM3) | Meets IEC 61249-2-21 and JEDEC J-STD-20D; eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating. |
| 400 W peak pulse power (10/1000 μs) | Supports single-event surge immunity per ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 (1 kV/2 kV) testing on 12 V systems. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage drift over lifetime; improves long-term reliability in humid or thermally cycled environments. |
| Low profile SMA package | 0.208" × 0.157" footprint with 0.078" height - compatible with high-density PCB layouts and automated pick-and-place equipment. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (up to 35 V) and alternator ripple on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and LDO input to limit voltage excursion during ISO 16750-2 load dump events. Use Value: Clamps peak voltage to ≤275 V within nanoseconds, preventing damage to 36 V-rated regulators and microcontrollers downstream. |
Use Scenario: Protecting 4–20 mA current-loop transmitters and analog front-ends in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Standoff protection on loop-powered sensor supply line, absorbing induced surges from nearby motor contactors or relay switching. Use Value: Maintains <1.09 μA leakage at 170 V nominal line voltage, avoiding measurement error in precision current-loop circuits. |
| Telecom DC Power Input Protection | Consumer Device USB Power Line Protection |
|
Use Scenario: Safeguarding PoE-powered network switches and base station RF amplifiers against lightning-induced surges on -48 V DC distribution buses. IC Role / Device Role / Timing Role: Primary clamping device on DC input stage, coordinated with upstream fuses and secondary filtering. Use Value: Delivers 300 W clamping capability above 78 V, enabling robust protection for telecom infrastructure operating at higher DC bus voltages. |
Use Scenario: Adding overvoltage resilience to USB-C PD power delivery inputs in portable medical monitors and smart home hubs. IC Role / Device Role / Timing Role: Secondary-level TVS on VBUS line, activated only after primary OVP IC fails or responds too slowly to fast-rising transients. Use Value: 275 V clamping voltage prevents latch-up or gate oxide rupture in USB PD controllers rated for 28 V absolute maximum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170AHE3/H | Same electrical specs but RoHS-compliant (E3) instead of halogen-free (HM3); no AEC-Q101 qualification. | Approved for commercial/industrial use only; not certified for automotive under AEC-Q101. | Select when halogen-free content is not required and automotive qualification is unnecessary. |
| SMBJ170A-HM3 | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - larger footprint (0.236" × 0.157"), higher RθJA (100 °C/W), 600 W PPPM rating. | Better thermal performance and higher surge margin; requires more PCB area and different stencil design. | Choose when higher pulse power headroom or improved thermal dissipation is needed, and board space allows SMB footprint. |
Compared with SMAJ170AHM3/H, SMAJ170AHE3/H lacks AEC-Q101 validation and halogen-free status, while SMBJ170A-HM3 offers greater surge robustness in a larger package - making SMAJ170AHM3/H optimal for space-constrained, automotive-qualified, halogen-free designs.
Availability
SMAJ170AHM3/H is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and telecom DC power input surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ170AHM3/H 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was developed for high-reliability transient suppression in automotive, industrial, and telecom systems - prioritizing AEC-Q101 qualification, tight VBR tolerance, and consistent clamping performance across temperature and surge cycles.
FAQ
What is the clamping voltage of SMAJ170AHM3/H at its rated peak pulse current?
The SMAJ170AHM3/H has a maximum clamping voltage (VC) of 275 V at its specified peak pulse current (IPPM) of 1.09 A, measured under the standardized 10/1000 μs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is confirmed in the Electrical Characteristics table on page 2 of the Vishay datasheet 88390.
Is SMAJ170AHM3/H qualified for automotive applications?
Yes, SMAJ170AHM3/H is AEC-Q101 qualified, as indicated by the "HM3" suffix and confirmed in the Ordering Information section (page 3) and Notes (page 2) of the Vishay datasheet. This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and surge endurance - validating its suitability for under-hood and chassis-mounted automotive electronics.
What does the "HM3" suffix signify in SMAJ170AHM3/H?
The "HM3" suffix in SMAJ170AHM3/H denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-20D MSL Level 1 and UL 94 V-0 flammability standards. It distinguishes this variant from E3 (RoHS only) and HE3/HM3 automotive variants, confirming both environmental compliance and process control for lead-free reflow assembly.
How does SMAJ170AHM3/H differ from SMAJ170AHE3/H?
SMAJ170AHM3/H and SMAJ170AHE3/H share identical electrical specifications (VWM, VBR, VC, PPPM), but differ in material compliance and qualification: HM3 is halogen-free and AEC-Q101 qualified, whereas E3 is RoHS-compliant only and lacks automotive qualification. Both use the same SMA package and mounting recommendations.
What is the maximum operating temperature for SMAJ170AHM3/H?
The SMAJ170AHM3/H has a maximum junction temperature (TJ max) of +150 °C, as specified in the Maximum Ratings table (page 1) of the Vishay datasheet. This rating applies under steady-state and transient conditions, and must be respected in thermal design - especially when operating near its 3.3 W power dissipation limit or under repetitive surge duty.
SMAJ170AHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 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)
SMAJ170AHM3/H FAQ
1.How can I place an order for SMAJ170AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170AHM3/H 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 SMAJ170AHM3/H reliable?
The price and inventory of SMAJ170AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ170AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ170AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170AHM3/H?
SMAJ170AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170AHM3/H 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 SMAJ170AHM3/H?
For technical support, including SMAJ170AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170AHM3/H requirements.
6.How does Aetrix verify that SMAJ170AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ170AHM3/H 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 SMAJ170AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ170AHM3/H?
All SMAJ170AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170AHM3/H, 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 SMAJ170AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ170AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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