My Inquiry
My Account
Vishay General Semiconductor - Diodes Division P4SMA51CAHM3/H
- Part No.:
- P4SMA51CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA51CAHM3/H.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,951
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMA51CAHM3/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 43.6 V standoff voltage (VWM), 48.5–53.6 V breakdown voltage (VBR) at 1 mA, 70.1 V maximum clamping voltage (VC) at 5.7 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - used in automotive sensor protection and industrial I/O interface surge suppression.
For engineers reviewing the P4SMA51CAHM3/H datasheet, P4SMA51CAHM3/H pinout, P4SMA51CAHM3/H application, or P4SMA51CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, low incremental surge resistance, and compatibility with automated SMT assembly on standard PCB pads.
Technical Context
The P4SMA51CAHM3/H operates as a voltage-clamping device that conducts above its breakdown threshold to shunt transient energy away from sensitive downstream circuitry. Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ns), while the bidirectional configuration enables symmetrical protection on AC-coupled or differential lines without polarity concerns.
Rated for 150 °C maximum junction temperature and MSL Level 1 moisture sensitivity, it supports reflow soldering up to 260 °C peak. The device delivers 400 W peak pulse power (derated to 300 W above 91 V) under 10/1000 µs waveform, with thermal resistance of 120 °C/W (junction-to-ambient) when mounted on 0.2" × 0.2" copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 43.6 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping onset. |
| VBR (Breakdown Voltage) | 48.5–53.6 V at 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 70.1 V at 5.7 A IPPM - Peak voltage seen by protected circuit during 10/1000 µs surge; critical for IC-level overvoltage margin. |
| PPPM (Peak Pulse Power) | 400 W - Energy-handling capacity under standardized 10/1000 µs waveform; sufficient for IEC 61000-4-5 Level 3 surges. |
| ID (Reverse Leakage) | 1.0 µA max at VWM - Ultra-low leakage preserves signal integrity and minimizes standby power loss in high-impedance nodes. |
| TJ max | 150 °C - Enables reliable operation in under-hood automotive and industrial environments with elevated ambient temperatures. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); cathode band not marked (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical avalanche junction; connects to line under protection (e.g., CAN_H or RS-485 A). |
| Cathode | Transient current entry (bidirectional) | Second terminal of symmetrical junction; connects to same line or complementary line (e.g., CAN_L or RS-485 B); no polarity marking required. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, differential, or floating signal lines without polarity constraints. |
| 400 W peak pulse power (10/1000 µs) | Handles common industrial and automotive surge events including ISO 7637-2 pulse 1/2a/5a and IEC 61000-4-5 combination wave. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT processes without pre-baking or special handling. |
| Glass-passivated junction | Ensures stable, repeatable avalanche performance over lifetime and temperature extremes. |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine bay or chassis modules exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across sensor signal and ground to limit transient excursions to <70.1 V. Use Value: Prevents latch-up or permanent damage to 12-bit ADC inputs and op-amp front-ends during ISO 7637-2 pulses. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., SN65HVD230) in factory automation PLCs connected to long cable runs. IC Role / Device Role / Timing Role: Differential-line TVS between A/B bus lines and ground, leveraging symmetrical clamping to suppress common-mode surges. Use Value: Maintains data integrity during lightning-induced surges up to 4 kV (IEC 61000-4-5) without disrupting communication timing. |
| Consumer USB Port ESD | Telecom DSL Line Protection |
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines after primary polymer-based TVS, targeting system-level IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Fast-response clamping element placed adjacent to connector to reduce voltage overshoot before reaching USB PHY. Use Value: Limits clamped voltage to ≤70.1 V, well below USB 2.0 PHY absolute maximum ratings (typically 6 V), preserving signal rise/fall times. |
Use Scenario: Overvoltage protection on ADSL/VDSL line cards where asymmetric surges occur on tip/ring conductors relative to ground. IC Role / Device Role / Timing Role: Bidirectional TVS installed between each line and ground, using identical P4SMA51CAHM3/H devices per conductor. Use Value: Provides matched clamping thresholds (±43.6 V) and low capacitance (<100 pF), minimizing signal distortion on 30 MHz DSL bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | Same VWM (43.6 V) and VC (70.1 V), but SMB package (DO-214AA); 600 W PPPM rating. | Higher power handling suits longer-duration surges; larger footprint requires PCB layout change. | Select when higher surge margin is needed and board space allows SMB footprint. |
| 1.5KE51CA | Through-hole DO-201 package; same electrical specs but 1500 W PPPM, higher junction capacitance (~1000 pF). | Not suitable for high-speed data lines; intended for power rail protection only. | Choose only for legacy through-hole designs or non-signal applications like DC power input filtering. |
Compared with SMBJ51CA and 1.5KE51CA, the P4SMA51CAHM3/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 validated reliability.
Availability
P4SMA51CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, consumer USB port hardening, and telecom DSL line protection requiring stable component supply and full traceability.
Supply support for P4SMA51CAHM3/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 optimization.
The P4SMA Series targets cost-sensitive, high-volume surge protection needs in automotive, industrial, and communications systems - engineered for robustness in harsh environments and seamless integration into automated SMT lines.
FAQ
What does the "HM3" suffix indicate in P4SMA51CAHM3/H?
The HM3 suffix in P4SMA51CAHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with automotive reliability standards including temperature cycling, highly accelerated life testing, and electrostatic discharge robustness - essential for use in vehicle subsystems such as ADAS sensors and body control modules.
Is P4SMA51CAHM3/H suitable for protecting high-speed data lines like USB 2.0 or CAN FD?
Yes, P4SMA51CAHM3/H is suitable for USB 2.0 and CAN FD protection due to its low junction capacitance (typically <100 pF at VWM), fast response time (<1 ns), and bidirectional clamping. Its 70.1 V clamping voltage provides ample margin below the 36 V absolute maximum rating of most CAN FD transceivers and preserves signal edge integrity at 5 Mbps and 12 Mbps data rates.
How does the 10/1000 µs waveform rating apply to real-world surge events?
The 400 W rating of P4SMA51CAHM3/H under the 10/1000 µs waveform corresponds directly to standardized surge tests including IEC 61000-4-5 (combination wave) and ISO 7637-2 Pulse 5a. This waveform models lightning-induced surges and inductive switching transients, ensuring the device can safely clamp multi-kV threats without failure when properly mounted on recommended 0.2" × 0.2" copper pads.
What is the significance of the "CA" in P4SMA51CAHM3/H?
The "CA" in P4SMA51CAHM3/H specifies a bidirectional configuration - meaning the device provides symmetrical transient suppression in both polarities. This eliminates the need for polarity-aware placement and makes it ideal for protecting AC-coupled signals, differential buses (e.g., RS-485, CAN), and floating sensor outputs where voltage reversals may occur during fault conditions.
Does P4SMA51CAHM3/H require derating at elevated ambient temperatures?
Yes, P4SMA51CAHM3/H requires derating above TA = 25 °C per Figure 2 in the datasheet. Its peak pulse power drops linearly to ~200 W at 85 °C ambient and ~100 W at 125 °C. Designers must verify worst-case junction temperature using RθJA = 120 °C/W and ensure TJ remains ≤150 °C during surge events, especially in enclosed automotive or industrial enclosures.
P4SMA51CAHM3/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):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- 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)
P4SMA51CAHM3/H FAQ
1.How can I place an order for P4SMA51CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA51CAHM3/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 P4SMA51CAHM3/H reliable?
The price and inventory of P4SMA51CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA51CAHM3/H is usually 5 days.
3.What payment methods are accepted for P4SMA51CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA51CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA51CAHM3/H?
P4SMA51CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA51CAHM3/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 P4SMA51CAHM3/H?
For technical support, including P4SMA51CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA51CAHM3/H requirements.
6.How does Aetrix verify that P4SMA51CAHM3/H is sourced from the original manufacturer or authorized distributors?
All P4SMA51CAHM3/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 P4SMA51CAHM3/H meets industry standards.
7.What is the process for return or replacement of P4SMA51CAHM3/H?
All P4SMA51CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA51CAHM3/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 P4SMA51CAHM3/H part is unused and in its original packaging.
Return procedure for P4SMA51CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA51CAHM3/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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
