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Vishay General Semiconductor - Diodes Division P4SMA170CAHM3/H
- Part No.:
- P4SMA170CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA170CAHM3/H.pdf
- Description:
- TVS DIODE 145VWM 234VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,198
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Product details
Overview
P4SMA170CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, rated for 170 V standoff voltage (VWM), 185 V breakdown voltage (VBR min), and 400 W peak pulse power (10/1000 μs). It clamps transients to ≤234 V at 1.3 A IPPM and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the P4SMA170CAHM3/H datasheet, P4SMA170CAHM3/H pinout, P4SMA170CAHM3/H application, or P4SMA170CAHM3/H equivalent, this device serves as a robust, halogen-free, RoHS-compliant TVS for bidirectional overvoltage suppression in sensor signal lines, power rails, and communication interfaces where fast response (<1 ns), low clamping ratio, and MSL Level 1 reflow compatibility are required.
Technical Context
The P4SMA170CAHM3/H operates as a bidirectional avalanche diode with symmetrical clamping behavior in both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM).
Designed for transient immunity per IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT), it delivers 400 W peak pulse power at TA = 25 °C (derated above 25 °C per Fig. 2), with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W - critical for PCB pad layout optimization on 5.0 mm × 5.0 mm copper areas.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 170 V - maximum continuous reverse voltage before conduction begins; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 162–179 V at IT = 1.0 mA - precise avalanche onset range ensuring predictable turn-on during transients |
| VC (Clamping Voltage) | 234 V at IPPM = 1.3 A (10/1000 μs) - limits downstream voltage stress to safe levels for protected ICs |
| PPPM (Peak Pulse Power) | 400 W - sustains high-energy surges typical of inductive switching or lightning-induced transients |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - negligible standby current, preserving signal integrity and power efficiency |
| TJ max | 150 °C - enables operation in under-hood automotive environments and industrial enclosures |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); cathode band absent (bidirectional symmetry).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche terminals | No polarity marking; either terminal serves as anode or cathode depending on transient polarity - simplifies layout and eliminates orientation errors |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients from relay coil collapse or motor commutation without degradation |
| Clamping ratio VC/VBR ≈ 1.45 | Low overvoltage margin ensures tight protection window for 3.3 V/5 V/12 V logic and analog circuits |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift across temperature and lifetime |
| MSL Level 1, 260 °C peak | Compatible with standard lead-free reflow profiles without pre-baking or special handling |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for automotive and industrial end equipment |
Applications
| Automotive Sensor Signal Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting analog output lines (e.g., 0–5 V throttle position sensor) from load dump and ISO 7637-2 pulses in engine control units. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and ground, clamping ±200 V transients within nanoseconds. Use Value: Prevents sensor IC latch-up or damage while maintaining <1 μA leakage to avoid DC offset errors. |
Use Scenario: Safeguarding CANH/CANL differential pair against ESD events and coupled noise in factory automation gateways. IC Role / Device Role / Timing Role: Two P4SMA170CAHM3/H devices used in common-mode configuration between CANH-GND and CANL-GND. Use Value: Clamps common-mode surges to ≤234 V without distorting the 1–2 V differential signaling window. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Drive Feedback |
Use Scenario: Shielding Ethernet PHY interface power rails (e.g., 3.3 V bias supply) from induced lightning surges in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Bidirectional TVS connected between rail and chassis ground, absorbing 400 W pulses per IEC 61000-4-5. Use Value: Maintains system uptime by preventing brownout or reset caused by rail sag during surge events. |
Use Scenario: Protecting hall-effect rotor position feedback lines in BLDC motor controllers inside washing machines and HVAC systems. IC Role / Device Role / Timing Role: TVS mounted at motor connector entry point, shunting inductive kickback from adjacent windings. Use Value: Eliminates false commutation signals caused by >100 V transients, improving motor timing accuracy and reducing audible noise. |
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 | Same VWM/VBR/VC ratings but SMB (DO-214AA) package - 25 % larger footprint, higher RθJA (100 °C/W) | Better suited for manual repair or lower-density boards; less ideal for fine-pitch automotive modules | Select when board space allows larger pads and thermal relief is less constrained |
| SMCJ170CA | Higher PPPM (1500 W), same VWM, but SMC (DO-214AB) package - 3× larger area, RθJA = 40 °C/W | Used where sustained surge energy exceeds 400 W, e.g., main power input stages | Choose only if system-level testing confirms need for >400 W rating; otherwise over-engineered |
Compared with SMBJ170CA and SMCJ170CA, the P4SMA170CAHM3/H offers optimal balance of compact SMA footprint, AEC-Q101 qualification, and 400 W capability - making it the preferred choice for space-constrained, automotive-grade signal-line protection where thermal mass and layout density are critical.
Availability
P4SMA170CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, telecom line cards, and consumer appliance motor control requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for P4SMA170CAHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The P4SMA Series targets cost-sensitive, high-volume transient suppression needs in automotive, industrial, and communications systems - delivering standardized TVS performance in compact, qualified packages with consistent manufacturing quality.
FAQ
What does the "CA" suffix indicate in P4SMA170CAHM3/H?
The "CA" suffix denotes a bidirectional configuration: the P4SMA170CAHM3/H conducts symmetrically in both directions, making it suitable for protecting AC signals, differential buses (e.g., CAN, RS-485), or ungrounded power rails. Unlike unidirectional variants (e.g., P4SMA170AHM3/H), it has no cathode marking and identical electrical behavior regardless of polarity applied across its terminals.
Is P4SMA170CAHM3/H suitable for IEC 61000-4-5 surge testing?
Yes - the P4SMA170CAHM3/H is rated for 400 W peak pulse power with a 10/1000 μs waveform, directly aligned with Level 3 (1 kV/2 Ω) and Level 4 (2 kV/2 Ω) surge test conditions defined in IEC 61000-4-5. When mounted per recommended 5.0 mm × 5.0 mm copper pads, it reliably clamps surges to ≤234 V without failure or parameter shift.
How does the HM3 suffix differ from E3 or M3 in P4SMA170CAHM3/H?
The "HM3" suffix indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification - specifically intended for automotive applications. In contrast, "E3" is RoHS-compliant but commercial-grade only, and "M3" adds halogen-free material without AEC-Q101 validation. The P4SMA170CAHM3/H meets automotive reliability standards including temperature cycling, HTRB, and ESD testing per AEC-Q101 Rev D.
What is the maximum operating temperature for P4SMA170CAHM3/H?
The P4SMA170CAHM3/H has a maximum junction temperature (TJ max) of +150 °C and operates across –65 °C to +150 °C. This rating supports under-hood automotive use, industrial motor drives, and enclosed power supplies. Derating applies above 25 °C ambient: peak pulse power decreases linearly per Figure 2 in the datasheet, reaching ~240 W at TJ = 125 °C.
Can P4SMA170CAHM3/H replace P4SMA170A in existing designs?
No - P4SMA170A is unidirectional, while P4SMA170CAHM3/H is bidirectional. Swapping them requires verifying circuit topology: if the original design relies on polarity-sensitive clamping (e.g., DC rail-to-ground), the bidirectional P4SMA170CAHM3/H may conduct during normal operation. Always confirm signal path grounding and transient polarity before substitution; the P4SMA170CAHM3/H is not a drop-in replacement for unidirectional variants.
P4SMA170CAHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 145V
- Voltage - Breakdown (Min):
- 162V
- Voltage - Clamping (Max) @ Ipp:
- 234V
- Current - Peak Pulse (10/1000µs):
- 1.3A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA170CAHM3/H FAQ
1.How can I place an order for P4SMA170CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA170CAHM3/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 P4SMA170CAHM3/H reliable?
The price and inventory of P4SMA170CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA170CAHM3/H is usually 5 days.
3.What payment methods are accepted for P4SMA170CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA170CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA170CAHM3/H?
P4SMA170CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA170CAHM3/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 P4SMA170CAHM3/H?
For technical support, including P4SMA170CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA170CAHM3/H requirements.
6.How does Aetrix verify that P4SMA170CAHM3/H is sourced from the original manufacturer or authorized distributors?
All P4SMA170CAHM3/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 P4SMA170CAHM3/H meets industry standards.
7.What is the process for return or replacement of P4SMA170CAHM3/H?
All P4SMA170CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA170CAHM3/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 P4SMA170CAHM3/H part is unused and in its original packaging.
Return procedure for P4SMA170CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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