My Inquiry
My Account
Vishay General Semiconductor - Diodes Division P4SMA20CAHM3/H
- Part No.:
- P4SMA20CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA20CAHM3/H.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,601
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMA20CAHM3/H 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 signal and power lines. It features a 20 V standoff voltage (VWM), 22.8 V minimum breakdown voltage (VBR), 27.7 V maximum clamping voltage (VC) at 14.4 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial electronics.
For engineers reviewing the P4SMA20CAHM3/H datasheet, P4SMA20CAHM3/H pinout, P4SMA20CAHM3/H application, or P4SMA20CAHM3/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), bidirectional clamping behavior, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker test.
Technical Context
The P4SMA20CAHM3/H operates as a bidirectional avalanche diode, symmetrically clamping transient overvoltages in both polarities without polarity marking. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), enabling protection against ESD, lightning-induced surges, and inductive switching spikes.
Rated for 150 °C maximum junction temperature and compliant with AEC-Q101 for automotive use, it delivers 400 W peak pulse power (derated to 300 W above 91 V) on 0.2" × 0.2" copper pads, with low incremental surge resistance and excellent clamping ratio (VC/VBR ≈ 1.22).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 22.8–25.2 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 27.7 V at 14.4 A IPPM - Peak voltage seen by protected circuit during 10/1000 µs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 µs) - Surge energy handling capacity; supports robust protection in repetitive transient environments. |
| ID (Reverse Leakage) | 1.0 µA at 20 V - Minimal leakage at rated VWM; preserves signal integrity and reduces standby power loss. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient; informs PCB pad design and derating above 25 °C. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, matte tin-plated leads, MSL Level 1 (260 °C peak reflow). Bidirectional configuration - no polarity marking required.
| 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 - functionally identical to anode in bidirectional mode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 400 W peak pulse power | Supports high-energy transients common in automotive load-dump and industrial motor switching events. |
| AEC-Q101 qualification | Validates reliability for under-hood automotive applications including engine control units and body electronics. |
| Halogen-free & RoHS-compliant (HM3) | Fulfills environmental compliance requirements for global OEM supply chains and end-of-life recycling. |
| Low-profile SMA package | Enables automated placement and space-constrained layouts while maintaining thermal performance via copper pad coupling. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from ESD and load-dump transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector or IC input pins. Use Value: Limits transient voltage to ≤27.7 V, preventing latch-up or gate oxide damage in 3.3 V/5 V interface ICs while meeting ISO 10605 and ISO 7637-2 requirements. |
Use Scenario: Safeguarding digital input/output channels of programmable logic controllers against inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC field-side signal lines prior to optocoupler or level-shifter input. Use Value: Absorbs 400 W surges without degradation, ensuring long-term reliability in factory automation environments with frequent switching noise. |
| Consumer Device USB Port Protection | Telecom Line Interface Protection |
Use Scenario: Shielding USB 2.0 data lines (D+/D−) and VBUS in portable medical monitors and smart home hubs from human-body-model ESD. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor placed adjacent to USB connector, before ESD-rated transceiver. Use Value: Clamps ±15 kV contact discharge to <30 V within <1 ns, preserving signal integrity and avoiding false resets in embedded microcontrollers. |
Use Scenario: Protecting Ethernet PHY interfaces and analog telephone line drivers from lightning-induced surges in VoIP gateways and DSL modems. IC Role / Device Role / Timing Role: Secondary-level TVS on tip/ring lines upstream of primary gas discharge tube (GDT) or polymer PTC. Use Value: Provides precise 27.7 V clamping to prevent overvoltage stress on sensitive PHY silicon while coordinating with upstream coarse protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA | Higher package thermal mass (SMB/DO-214AA); RθJA ≈ 80 °C/W; same VWM/VC but 600 W PPPM rating. | Better suited for higher average power dissipation; requires larger PCB pad area than SMA. | Select when sustained surge repetition or elevated ambient temperatures demand lower thermal resistance. |
| 1.5KE20CA | Through-hole (DO-201AE); 1500 W PPPM; higher capacitance and slower response due to lead inductance. | Used where board-level serviceability or legacy through-hole assembly is required. | Choose only if manual rework, high-surge legacy systems, or cost-driven through-hole manufacturing outweigh SMT advantages. |
Compared with SMBJ20CA and 1.5KE20CA, the P4SMA20CAHM3/H offers optimal balance of compact SMA footprint, AEC-Q101 qualification, and 400 W surge capability - making it preferred for space-constrained automotive and industrial SMT designs requiring certified reliability.
Availability
P4SMA20CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and consumer USB interface protection requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for P4SMA20CAHM3/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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA Series targets high-reliability transient suppression in automotive, industrial, and telecom systems - engineered for fast clamping, low leakage, and robust surge handling in surface-mount form factors.
FAQ
What is the clamping voltage of the P4SMA20CAHM3/H under a 10/1000 µs surge?
The P4SMA20CAHM3/H has a maximum clamping voltage (VC) of 27.7 V at 14.4 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88367 and defines the upper voltage limit imposed on protected circuits during transient events - critical for ensuring compatibility with 3.3 V or 5 V logic interfaces downstream of the device.
Is the P4SMA20CAHM3/H qualified for automotive applications?
Yes, the P4SMA20CAHM3/H carries the HM3 suffix, indicating halogen-free, RoHS-compliant construction and full AEC-Q101 qualification. It has passed stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD per JESD22-A114, making it approved for use in automotive powertrain, chassis, and body electronics where reliability under harsh conditions is mandatory.
How does the bidirectional configuration of P4SMA20CAHM3/H affect its PCB layout?
The P4SMA20CAHM3/H has no polarity marking and functions identically in both directions, simplifying PCB layout by eliminating orientation constraints. Engineers can place it inline on differential pairs, AC-coupled signals, or floating buses without concern for anode/cathode alignment - reducing assembly errors and enabling symmetric routing for balanced EMI performance in applications like CAN FD or RS-485 interfaces.
What is the maximum operating junction temperature for P4SMA20CAHM3/H?
The P4SMA20CAHM3/H has a maximum junction temperature (TJ max.) of +150 °C, as specified in the Absolute Maximum Ratings table of Vishay document 88367. This rating allows operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures, provided thermal design accounts for RθJA = 120 °C/W and appropriate copper pad area per the recommended mounting layout.
Does P4SMA20CAHM3/H meet UL recognition requirements?
Yes, the P4SMA20CAHM3/H is Underwriters Laboratories (UL) recognized under file number E136766 for both unidirectional and bidirectional configurations, complying with UL 497B for signal-line protectors. This certification validates its safety performance in telecom, industrial, and building automation systems where regulatory approval for surge protection components is required.
P4SMA20CAHM3/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):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 14.4A
- 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)
P4SMA20CAHM3/H FAQ
1.How can I place an order for P4SMA20CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA20CAHM3/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 P4SMA20CAHM3/H reliable?
The price and inventory of P4SMA20CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA20CAHM3/H is usually 5 days.
3.What payment methods are accepted for P4SMA20CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA20CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA20CAHM3/H?
P4SMA20CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA20CAHM3/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 P4SMA20CAHM3/H?
For technical support, including P4SMA20CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA20CAHM3/H requirements.
6.How does Aetrix verify that P4SMA20CAHM3/H is sourced from the original manufacturer or authorized distributors?
All P4SMA20CAHM3/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 P4SMA20CAHM3/H meets industry standards.
7.What is the process for return or replacement of P4SMA20CAHM3/H?
All P4SMA20CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA20CAHM3/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 P4SMA20CAHM3/H part is unused and in its original packaging.
Return procedure for P4SMA20CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA20CAHM3/H 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 …
