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Vishay General Semiconductor - Diodes Division P4SMA170CAHM3/I
- Part No.:
- P4SMA170CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA170CAHM3/I.pdf
- Description:
- TVS DIODE 145VWM 234VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,676
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Product details
Overview
P4SMA170CAHM3/I 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), 189 V minimum breakdown voltage (VBR), and 400 W peak pulse power (10/1000 µs). It clamps transients to ≤234 V at 1.3 A peak pulse current and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the P4SMA170CAHM3/I datasheet, P4SMA170CAHM3/I pinout, P4SMA170CAHM3/I application, or P4SMA170CAHM3/I equivalent, this device serves as a robust, halogen-free, RoHS-compliant TVS for bidirectional overvoltage suppression in automotive sensor interfaces, power supply rails, and communication lines where fast response (<1 ns), low clamping ratio, and MSL Level 1 reflow compatibility are required.
Technical Context
The P4SMA170CAHM3/I 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), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive surge), it delivers 234 V clamping voltage at 1.3 A IPPM under 10/1000 µs waveform, with thermal resistance RθJA = 120 °C/W and maximum junction temperature of +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 170 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin for protected circuit. |
| VBR (Breakdown Voltage) | 162–179 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 234 V at IPPM = 1.3 A (10/1000 µs) - Actual voltage seen by downstream circuit during worst-case surge; critical for IC survivability. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy-handling capability under standard lightning/surge waveform; derates above 25 °C per Fig. 2. |
| ID (Reverse Leakage) | ≤1.0 µA at 170 V - Minimal standby current; avoids loading sensitive analog or low-power circuits. |
| TJ max. | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Cathode band absent - bidirectional symmetry eliminates polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical avalanche junction; conducts during negative transients relative to cathode reference. |
| Cathode | Transient current entry (positive polarity) | Other terminal of symmetrical junction; conducts during positive transients; terminals are electrically interchangeable in bidirectional use. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), and ungrounded power rails without polarity concerns. |
| 400 W peak pulse power (10/1000 µs) | Handles high-energy surges common in automotive load-dump and industrial switching events while maintaining low PCB footprint. |
| AEC-Q101 qualification (HM3 suffix) | Validated for automotive applications including engine control units, ADAS sensors, and body electronics requiring long-term reliability. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity precautions or baking requirements. |
| Glass-passivated junction | Ensures stable VBR tolerance, low leakage drift over time/temperature, and resistance to humidity-induced degradation. |
Applications
| Automotive Sensor Protection | Industrial Power Supply Input |
|---|---|
Use Scenario: Protecting ABS wheel speed sensor signal lines from ISO 7637-2 pulse 1 and pulse 2b transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential sensor output pins to clamp ±100 V surges within 1 ns. Use Value: Prevents latch-up or damage to downstream signal-conditioning amplifiers and microcontrollers while maintaining signal integrity below 234 V. |
Use Scenario: Safeguarding 24 V DC input stage of PLC I/O modules against inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on unregulated rail, absorbing 400 W surges without thermal runaway. Use Value: Eliminates need for series fusing or secondary crowbar circuits; enables compact, maintenance-free front-end protection. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485 transceivers in building automation gateways from ESD and lightning-induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Differential-mode TVS connected between A/B lines and ground, leveraging symmetrical clamping to preserve common-mode rejection. Use Value: Maintains >25 kV ESD immunity (IEC 61000-4-2) and withstands repetitive 1 kV EFT bursts without parameter shift. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Across-motor terminals to clamp inductive flyback voltage to <234 V, protecting MOSFET half-bridge drivers. Use Value: Extends MOSFET lifetime by limiting VDS stress during turn-off; compatible with 150 °C junction temperature limits in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170CA | Same VWM/VBR/VC specs but in larger SMB (DO-214AA) package; 600 W PPPM rating; RθJA = 80 °C/W. | Better thermal performance and higher surge margin, but requires 30% larger PCB area. | Select when higher single-pulse energy (e.g., ISO 7637-2 pulse 5a) or sustained surge duty cycles demand lower thermal resistance. |
| 1.5KE170CA | Through-hole DO-201 package; 1500 W PPPM; VBR 162–179 V; VC = 274 V at 5.5 A; no AEC-Q101 qualification. | Higher power handling but incompatible with automated SMT lines and unsuitable for automotive production. | Use only in legacy through-hole designs or non-automotive industrial equipment where board space and reflow compatibility are not constraints. |
Compared with SMBJ170CA and 1.5KE170CA, the P4SMA170CAHM3/I uniquely balances AEC-Q101 compliance, SMT scalability, and 400 W surge capability in the smallest standardized surface-mount TVS package-making it optimal for space-constrained automotive and portable industrial electronics.
Availability
P4SMA170CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial power supply inputs, telecom line interfaces, and consumer appliance motor control requiring stable component supply, halogen-free compliance, and AEC-Q101 traceability.
Supply support for P4SMA170CAHM3/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, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The P4SMA Series targets cost-sensitive, high-volume applications demanding robust transient suppression-including automotive, industrial controls, and consumer electronics-with focus on SMT manufacturability and AEC-Q101 readiness.
FAQ
What does the "CA" suffix indicate in P4SMA170CAHM3/I?
The "CA" suffix denotes that the P4SMA170CAHM3/I is a bidirectional Transient Voltage Suppressor. Unlike unidirectional variants (e.g., P4SMA170A), it provides symmetrical clamping for both positive and negative voltage transients-ideal for protecting AC-coupled signals, differential buses, or floating power rails without polarity constraints.
Is P4SMA170CAHM3/I suitable for automotive applications?
Yes, the P4SMA170CAHM3/I is AEC-Q101 qualified (indicated by the "HM3" suffix), meaning it has passed rigorous stress tests for automotive use-including temperature cycling, high-temperature reverse bias, and ESD. It is approved for under-hood and cabin applications such as sensor interfaces, body control modules, and infotainment power rails.
What is the clamping voltage of P4SMA170CAHM3/I under surge conditions?
The P4SMA170CAHM3/I clamps to a maximum of 234 V at 1.3 A peak pulse current under the standard 10/1000 µs waveform. This value is measured per Figure 1 in the datasheet and represents the actual voltage imposed on protected circuitry during worst-case transient events.
How does the HM3 suffix differ from E3 or M3 in P4SMA170CAHM3/I?
The "HM3" suffix indicates halogen-free, RoHS-compliant construction *and* AEC-Q101 qualification. In contrast, "E3" is RoHS-compliant commercial grade, and "M3" is halogen-free RoHS-compliant commercial grade-neither carries automotive qualification. Only HM3 and HE3 variants meet AEC-Q101 requirements.
Can P4SMA170CAHM3/I be used in place of a unidirectional TVS like P4SMA170A?
No-P4SMA170CAHM3/I is bidirectional and lacks polarity marking, while P4SMA170A is unidirectional with a cathode band. Substituting them requires verifying circuit topology: P4SMA170CAHM3/I works only where symmetrical clamping is needed (e.g., across differential lines), whereas P4SMA170A is required for DC rail-to-ground protection with defined polarity.
P4SMA170CAHM3/I 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/I FAQ
1.How can I place an order for P4SMA170CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA170CAHM3/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 P4SMA170CAHM3/I reliable?
The price and inventory of P4SMA170CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA170CAHM3/I is usually 5 days.
3.What payment methods are accepted for P4SMA170CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA170CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA170CAHM3/I?
P4SMA170CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA170CAHM3/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 P4SMA170CAHM3/I?
For technical support, including P4SMA170CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA170CAHM3/I requirements.
6.How does Aetrix verify that P4SMA170CAHM3/I is sourced from the original manufacturer or authorized distributors?
All P4SMA170CAHM3/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 P4SMA170CAHM3/I meets industry standards.
7.What is the process for return or replacement of P4SMA170CAHM3/I?
All P4SMA170CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA170CAHM3/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 P4SMA170CAHM3/I part is unused and in its original packaging.
Return procedure for P4SMA170CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA170CAHM3/I Tags
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