My Inquiry
My Account
Vishay General Semiconductor - Diodes Division P4SMA33CAHM3_A/I
- Part No.:
- P4SMA33CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA33CAHM3_A/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,002
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMA33CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in the P4SMA series, designed for clamping voltage transients on signal or power lines. It features a 33 V standoff voltage (VWM), 37.1–41.0 V breakdown voltage (VBR) at 1 mA, 45.7 V maximum clamping voltage at 8.8 A peak pulse current, and 400 W peak pulse power capability with a 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial electronics.
For engineers reviewing the P4SMA33CAHM3_A/I datasheet, P4SMA33CAHM3_A/I pinout, P4SMA33CAHM3_A/I application, or P4SMA33CAHM3_A/I equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, SMA (DO-214AC) package compatibility, and thermal derating above 25 °C ambient.
Technical Context
The P4SMA33CAHM3_A/I 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 low leakage (<1.0 µA at VWM = 28.2 V).
It delivers 400 W peak pulse power (10/1000 µs) up to 91 V, then derates to 300 W above that threshold; thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, with maximum junction temperature rated at +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 28.2 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin for protected circuitry. |
| VBR (Breakdown Voltage) | 37.1–41.0 V at IT = 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 45.7 V at IPPM = 8.8 A - peak voltage seen by downstream components during worst-case surge; critical for IC-level protection. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 µs) - energy-handling capacity under standardized surge; supports IEC 61000-4-5 Level 3/4 compliance testing. |
| ID (Reverse Leakage) | <1.0 µA at VWM - minimal standby current draw; avoids signal integrity degradation in high-impedance sensor interfaces. |
| TJ max. | +150 °C - enables operation in under-hood automotive environments and industrial enclosures without forced cooling. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; suffix HM3 denotes halogen-free, RoHS-compliant construction. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; meets UL 94 V-0 flammability rating and MSL level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; symmetrical with cathode in bidirectional operation | No polarity marking required; terminals are interchangeable for AC or differential line protection. |
| Cathode | Current exit terminal in forward bias; symmetrical with anode in bidirectional operation | Identical electrical behavior to anode; device functions identically regardless of orientation on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., CAN, RS-485, sensor bridges) without polarity concerns. |
| 400 W peak pulse power (≤91 V) | Supports robust immunity against lightning-induced surges and inductive switching spikes in 12 V/24 V automotive and industrial systems. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, body electronics, and ADAS sensors requiring long-term field reliability. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ESD, load dump), improving protection margin for sensitive ICs. |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT assembly processes without pre-baking or special handling requirements. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector interface to limit transient voltage before reaching ADC input or signal conditioner IC. Use Value: Maintains signal integrity below 45.7 V clamping threshold while surviving 400 W surges - enabling compliance with ISO 16750-2 Class III/IV stress tests. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controller (PLC) backplanes subject to field wiring faults and inductive kickback. IC Role / Device Role / Timing Role: Fast-response voltage limiter across input terminals, absorbing repetitive 10/1000 µs transients without degradation. Use Value: Prevents latch-up or permanent damage to optocoupler input stages and microcontroller GPIOs during factory floor EMI events. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485 transceiver data lines in building automation gateways connected to long cable runs susceptible to induced lightning surges. IC Role / Device Role / Timing Role: Differential-mode TVS pair (one per line) referenced to common ground, leveraging symmetrical bidirectional conduction. Use Value: Clamps common-mode transients to ≤45.7 V within nanoseconds, preserving data integrity and meeting IEC 61000-4-5 2 kV surge immunity requirements. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, washing machines). IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS mounted across motor terminals to shunt inductive energy back into the supply rail. Use Value: Eliminates need for snubber RC networks while maintaining <1 µA standby current - extending battery life in cordless variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Same VWM (28.2 V), higher PPPM (600 W), larger SMB (DO-214AA) package (4.58 mm × 3.94 mm vs. SMA's 4.50 mm × 2.79 mm) | Better surge handling but requires PCB layout change; not drop-in compatible due to footprint mismatch | Select when higher energy absorption is needed and board space allows larger package. |
| 1.5KE33CA | Same VWM and bidirectional function, through-hole DO-15 package, 1500 W PPPM, higher leakage (5 µA max at VWM) | Designed for legacy through-hole assembly; unsuitable for automated SMT lines or space-constrained designs | Choose only for repair/refurbishment of existing through-hole systems where rework is acceptable. |
Compared with SMBJ33CA and 1.5KE33CA, the P4SMA33CAHM3_A/I offers optimal balance of AEC-Q101 qualification, compact SMA footprint, and 400 W surge capability - making it preferred for new automotive and industrial SMT designs where reliability, size, and process compatibility are jointly critical.
Availability
P4SMA33CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom line interfaces, and consumer appliance motor drives requiring stable component supply with full traceability and lifecycle continuity.
Supply support for P4SMA33CAHM3_A/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, TVS devices, and power MOSFETs with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA series was developed for high-reliability transient suppression in automotive, industrial, and telecom systems - prioritizing AEC-Q101 qualification, low-profile SMT packaging, and consistent clamping performance across temperature and lifetime.
FAQ
What is the clamping voltage of the P4SMA33CAHM3_A/I at its rated peak pulse current?
The P4SMA33CAHM3_A/I has a maximum clamping voltage (VC) of 45.7 V at its rated peak pulse current (IPPM) of 8.8 A, measured using the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in the Electrical Characteristics table of the Vishay datasheet (Document Number: 88367, Rev. 09-Jan-2024). The P4SMA33CAHM3_A/I maintains this clamping performance across its specified operating temperature range.
Is the P4SMA33CAHM3_A/I suitable for automotive applications?
Yes, the P4SMA33CAHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix denoting halogen-free, RoHS-compliant construction with automotive-grade reliability validation. It meets requirements for temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge (ESD) per AEC-Q101. The P4SMA33CAHM3_A/I is explicitly recommended for engine control units, body electronics, and ADAS sensor protection where sustained operation up to +150 °C junction temperature is required.
How does the bidirectional design of the P4SMA33CAHM3_A/I affect its PCB layout?
The P4SMA33CAHM3_A/I has no polarity marking and identical electrical behavior in both directions, allowing unrestricted orientation during placement. This eliminates orientation errors in automated assembly and simplifies layout for AC-coupled or differential signal paths (e.g., CAN bus, RS-485). Unlike unidirectional TVS diodes, the P4SMA33CAHM3_A/I requires no cathode band alignment - reducing design review time and eliminating risk of reverse installation. Its SMA (DO-214AC) footprint remains unchanged regardless of signal polarity.
What is the maximum reverse leakage current for the P4SMA33CAHM3_A/I at its standoff voltage?
The P4SMA33CAHM3_A/I exhibits a maximum reverse leakage current (ID) of 1.0 µA at its standoff voltage (VWM) of 28.2 V, measured at TA = 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes power loss in battery-powered systems. The value is verified per the Electrical Characteristics table in the official Vishay datasheet and remains within specification across the full operating temperature range (-65 °C to +150 °C).
Does the P4SMA33CAHM3_A/I require derating at elevated ambient temperatures?
Yes, the P4SMA33CAHM3_A/I must be derated above TA = 25 °C per Figure 2 in the Vishay datasheet (Document Number: 88367). Its peak pulse power capability decreases linearly: at 85 °C ambient, PPPM drops to approximately 240 W (60% of 400 W); at 125 °C, it falls to ~120 W. Derating is based on thermal resistance RθJA = 120 °C/W and assumes mounting on 0.2" × 0.2" copper pads. The P4SMA33CAHM3_A/I's maximum junction temperature remains +150 °C under all valid derating conditions.
P4SMA33CAHM3_A/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- 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)
P4SMA33CAHM3_A/I FAQ
1.How can I place an order for P4SMA33CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA33CAHM3_A/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 P4SMA33CAHM3_A/I reliable?
The price and inventory of P4SMA33CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA33CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for P4SMA33CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA33CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA33CAHM3_A/I?
P4SMA33CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA33CAHM3_A/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 P4SMA33CAHM3_A/I?
For technical support, including P4SMA33CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA33CAHM3_A/I requirements.
6.How does Aetrix verify that P4SMA33CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All P4SMA33CAHM3_A/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 P4SMA33CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of P4SMA33CAHM3_A/I?
All P4SMA33CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA33CAHM3_A/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 P4SMA33CAHM3_A/I part is unused and in its original packaging.
Return procedure for P4SMA33CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA33CAHM3_A/I 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…
