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Vishay General Semiconductor - Diodes Division SMA5J33AHM3_A/I
- Part No.:
- SMA5J33AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J33AHM3_A/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA5J33AHM3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on DC power rails and signal lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR), 53.3 V clamping voltage at 9.4 A peak pulse current, and 500 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMA5J33AHM3_A/I datasheet, SMA5J33AHM3_A/I pinout, SMA5J33AHM3_A/I application, or SMA5J33AHM3_A/I equivalent, key selection criteria include clamping performance under 10/1000 μs surges, AEC-Q101 qualification status, thermal resistance (RθJA = 80 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its design targets transient suppression per ISO 7637-2 and IEC 61000-4-5 standards in automotive and industrial environments.
The SMA5J33AHM3_A/I is halogen-free, RoHS-compliant, and qualified to AEC-Q101 - confirmed by Vishay's HM3 suffix and "_A/I" ordering code denoting halogen-free, AEC-Q101 qualified version in 13" tape-and-reel packaging. Junction temperature range spans −55 °C to +150 °C, with thermal resistance RθJL = 25 °C/W to leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V systems. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - verified breakdown threshold ensures predictable turn-on during transients. |
| VC @ IPPM | 53.3 V at 9.4 A - clamping voltage limits downstream IC stress during 10/1000 μs surge events. |
| PPPM | 500 W - peak pulse power handling capacity with standard 10/1000 μs waveform per ANSI/IEEE C62.35. |
| RθJA | 80 °C/W - thermal resistance dictates derating above 25 °C ambient; requires minimum 5.0 mm × 5.0 mm copper pad per terminal. |
| Polarity | Unidirectional - cathode marked by band; enables asymmetric protection on positive-rail circuits only. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Molding compound meets UL 94 V-0. Polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or lower-potential node in unidirectional clamp configuration. |
| Cathode (banded end) | Current exit point during reverse-biased clamping | Connected to protected line (e.g., 24 V supply rail); conducts surge current to ground when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Low profile SMA package | Enables high-density PCB layouts and compatibility with automated pick-and-place equipment (MSL level 1, 260 °C peak reflow). |
| Glass passivated junction | Ensures stable VBR over lifetime and improved moisture resistance versus epoxy-passivated alternatives. |
| 500 W peak pulse power | Supports robust protection against ISO 7637-2 Pulse 1/2a/5a transients in 12 V/24 V automotive subsystems. |
| AEC-Q101 qualification (HM3) | Validates reliability for under-hood and ADAS applications requiring extended temperature operation and long-term stability. |
| Halogen-free & RoHS-compliant | Meets automotive OEM material compliance requirements (JESD201 Class 2 whisker resistance). |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN transceiver power pins and analog sensor supply lines from load dump and inductive switching spikes in engine control units. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between 24 V rail and ground, activated within <1 ns upon overvoltage detection. Use Value: Limits voltage seen by downstream LDOs and signal conditioners to ≤53.3 V during 500 W surges, preserving functional safety integrity. |
Use Scenario: Safeguarding 24 V digital input channels of programmable logic controllers against field-wiring induced transients and relay coil flyback. IC Role / Device Role / Timing Role: Standoff protector on input optocoupler front-end, conducting only during >36.7 V excursions to shunt energy to chassis ground. Use Value: Maintains input logic threshold margin while enabling >100,000 surge cycles without parameter drift due to glass-passivated junction. |
| Telecom Power Supply Rail Clamping | Consumer Appliance Motor Drive Protection |
Use Scenario: Secondary-side DC bus protection in PoE-powered network switches exposed to lightning-induced surges on Ethernet cabling. IC Role / Device Role / Timing Role: Fast-response clamping element on 48 V intermediate bus, coordinated with upstream MOVs for staged energy absorption. Use Value: Achieves 53.3 V clamping at 9.4 A with <100 ps response, reducing required bulk capacitance and improving system-level surge immunity. |
Use Scenario: Suppressing commutation spikes on BLDC motor driver power stages in smart home appliances (e.g., HVAC fans, washing machine pumps). IC Role / Device Role / Timing Role: Unidirectional TVS across MOSFET drain-source nodes to clamp inductive kickback during PWM switching. Use Value: Prevents avalanche failure of 60 V-rated MOSFETs by limiting transient voltage to 53.3 V, extending FET lifetime in high-cycle applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J33AHE3_A/I | Same electrical specs, but RoHS-compliant commercial grade (non-AEC-Q101); E3 suffix indicates standard tin plating without halogen-free certification. | Lacks AEC-Q101 validation; suitable for industrial/commercial designs where automotive qualification is not mandated. | Select SMA5J33AHE3_A/I for cost-sensitive non-automotive applications requiring identical clamping performance. |
| SMCJ33A-H | Higher power rating (1500 W), larger SMC (DO-214AB) package, same VWM/VBR/VC specs; RθJA = 20 °C/W vs. 80 °C/W. | Better thermal performance and surge margin; requires larger PCB footprint and different pad layout. | Choose SMCJ33A-H when system-level surge tests exceed 500 W or board space allows larger package for enhanced reliability. |
Compared with SMA5J33AHM3_A/I, SMA5J33AHE3_A/I offers identical protection performance without AEC-Q101 assurance, while SMCJ33A-H delivers triple the pulse power handling in a thermally superior but physically larger package - enabling trade-offs between footprint, qualification, and surge margin.
Availability
SMA5J33AHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC inputs, and telecom power supplies requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMA5J33AHM3_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 optoelectronics with emphasis on reliability and application-specific performance.
The SMA5J series is engineered for high-power-density transient suppression in space-constrained automotive and industrial systems, prioritizing fast response, repeatable clamping, and AEC-Q101 compliance.
FAQ
What is the clamping voltage of the SMA5J33AHM3_A/I at its rated peak pulse current?
The SMA5J33AHM3_A/I has a maximum clamping voltage (VC) of 53.3 V at 9.4 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMA5J33AHM3_A/I maintains this clamping performance across its qualified temperature range of −55 °C to +150 °C.
Is the SMA5J33AHM3_A/I qualified to AEC-Q101, and what does the 'HM3' suffix indicate?
Yes, the SMA5J33AHM3_A/I is AEC-Q101 qualified. The 'HM3' suffix explicitly denotes halogen-free, RoHS-compliant construction with full AEC-Q101 validation - confirmed in Vishay's ordering information table and product family documentation. This makes the SMA5J33AHM3_A/I suitable for automotive applications requiring certified reliability, such as body control modules and ADAS sensor interfaces.
What is the thermal resistance and recommended PCB layout for optimal performance of the SMA5J33AHM3_A/I?
The SMA5J33AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. To ensure reliable operation at full 500 W rating, designers must implement these minimum pad dimensions and avoid thermal isolation - the SMA5J33AHM3_A/I's junction-to-lead resistance (RθJL) is 25 °C/W, supporting efficient heat transfer to PCB copper.
How does the SMA5J33AHM3_A/I differ from bidirectional variants like SMA5J33CA?
The SMA5J33AHM3_A/I is unidirectional, with polarity marked by a cathode band and intended for DC rail protection where surge direction is known (e.g., 24 V to ground). In contrast, SMA5J33CA is bidirectional, offering symmetrical clamping in both directions - suitable for AC lines or differential signals. Electrical characteristics like VWM and VC apply identically in both directions for the CA variant, whereas the SMA5J33AHM3_A/I only clamps in reverse bias.
What packaging format is supplied for the SMA5J33AHM3_A/I, and what does the '_A/I' suffix mean?
The SMA5J33AHM3_A/I is supplied in 13" diameter plastic tape-and-reel packaging, with base quantity of 7500 units per reel. The '_A/I' suffix indicates revision 'A' and packaging code 'I', where 'I' specifically denotes the 13" reel format - consistent with Vishay's documented ordering nomenclature. This packaging supports high-volume SMT assembly and is compatible with standard feeder systems.
SMA5J33AHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 9.4A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J33AHM3_A/I FAQ
1.How can I place an order for SMA5J33AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J33AHM3_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 SMA5J33AHM3_A/I reliable?
The price and inventory of SMA5J33AHM3_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 SMA5J33AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMA5J33AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J33AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J33AHM3_A/I?
SMA5J33AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J33AHM3_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 SMA5J33AHM3_A/I?
For technical support, including SMA5J33AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J33AHM3_A/I requirements.
6.How does Aetrix verify that SMA5J33AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMA5J33AHM3_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 SMA5J33AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMA5J33AHM3_A/I?
All SMA5J33AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J33AHM3_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 SMA5J33AHM3_A/I part is unused and in its original packaging.
Return procedure for SMA5J33AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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