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Vishay General Semiconductor - Diodes Division SMA5J33CAHM3/I
- Part No.:
- SMA5J33CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J33CAHM3/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,444
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Product details
Overview
SMA5J33CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on power and signal lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 500 W peak pulse power (10/1000 µs), clamping voltage of 53.3 V at 9.4 A IPPM, and operates from –55 °C to +150 °C - used in automotive sensor interface protection and industrial I/O line hardening.
For engineers reviewing the SMA5J33CAHM3/I datasheet, SMA5J33CAHM3/I pinout, SMA5J33CAHM3/I application, or SMA5J33CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (via HM3 suffix), halogen-free RoHS compliance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device functions as a voltage-clamped crowbar during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity marking requirements.
Rated for 500 W peak pulse power under standardized 10/1000 µs waveform, it delivers 53.3 V clamping at 9.4 A peak pulse current while maintaining ≤1.0 µA reverse leakage at 33 V stand-off. Thermal resistance is 80 °C/W (junction-to-ambient) and 25 °C/W (junction-to-lead) when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before significant leakage; defines safe working range for protected circuitry. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - guaranteed breakdown threshold window; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 53.3 V at 9.4 A - clamped voltage seen by downstream components during 500 W surge; determines stress on protected ICs. |
| PPPM | 500 W (10/1000 µs) - energy-handling capacity for single transient events; validates suitability for ISO 7637-2 Pulse 1/2a/5a. |
| TJ max | +150 °C - maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
| Package | SMA (DO-214AC) - surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with standard reflow profiles (MSL Level 1, 260 °C peak). |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; enabled by HM3 suffix. |
Pinout & Package
Two-terminal bidirectional device in SMA (DO-214AC) package; no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, with whisker resistance per JESD 201 Class 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Bidirectional terminal pair | Identical electrical behavior in either direction; no cathode band - simplifies PCB layout and eliminates orientation errors. |
| Cathode Band (absent) | N/A | Confirmed absent per datasheet: "no marking on bidirectional types"; eliminates risk of incorrect installation during assembly. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| AEC-Q101 qualified (HM3) | Validated for automotive applications including engine control modules and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant | Meets global environmental regulations and enables use in green manufacturing programs. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for sensitive 3.3 V/5 V logic. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking; reduces production handling overhead. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Withstands 500 W surges while clamping below 54 V, preserving integrity of 3.3 V/5 V microcontrollers and ADC front-ends. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges from solenoid valves and motor contactors. IC Role / Device Role / Timing Role: Primary overvoltage suppression element across 24 V DC input terminals, coordinated with series impedance and filtering. Use Value: 33 V VWM aligns with 24 V nominal systems; 53.3 V VC ensures downstream optocouplers and level shifters remain within absolute maximum ratings. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Transient suppression on Ethernet PHY power rails (e.g., 3.3 V bias supply) and auxiliary control lines exposed to ESD and lightning-induced coupling. IC Role / Device Role / Timing Role: Secondary-level protection device located after primary common-mode chokes and before LDO regulators. Use Value: Sub-ns response and low capacitance preserve signal integrity on 100BASE-TX lines while meeting IEC 61000-4-2 Level 4 (±15 kV air). |
Use Scenario: Input-stage surge protection for USB-C PD adapters and multi-port chargers subjected to mains-borne transients per IEC 61000-4-5. IC Role / Device Role / Timing Role: First-line defense across AC-DC rectifier output or secondary-side 5–20 V rails prior to DC-DC conversion. Use Value: 500 W PPPM rating handles combination wave surges (1.2/50 µs + 8/20 µs); halogen-free HM3 construction supports UL/CE certification requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J33CAHE3/I | Same electrical specs and package; RoHS-compliant but not halogen-free; AEC-Q101 qualified (HE3 suffix). | Acceptable for automotive use where halogen content is unrestricted; lacks halogen-free certification required by some OEMs. | Select HE3 if halogen-free material is not mandated; verify OEM material declarations before use. |
| SMA6J33CAHM3/I | Higher 600 W PPPM rating; same VWM/VBR/VC; identical SMA package and AEC-Q101/halogen-free status. | Preferred for designs requiring higher surge margin (e.g., 12 V battery rail in start-stop vehicles) without layout change. | Choose SMA6J33CAHM3/I when system-level testing reveals marginal margin with 500 W rating. |
Compared with SMA5J33CAHM3/I, SMA5J33CAHE3/I offers identical automotive qualification but lacks halogen-free compliance, while SMA6J33CAHM3/I provides 20 % higher surge power handling in the same footprint - enabling robustness upgrades without PCB revision.
Availability
SMA5J33CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and telecom line interface applications requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMA5J33CAHM3/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, MOSFETs, optoelectronics, and passive components 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 AEC-Q101 qualification, surge robustness, and SMT manufacturability.
FAQ
What does the 'HM3' suffix indicate in SMA5J33CAHM3/I?
The HM3 suffix in SMA5J33CAHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with automotive reliability standards and environmental regulations, distinguishing it from commercial-grade E3/M3 variants and non-automotive HE3 versions. This makes SMA5J33CAHM3/I suitable for under-hood and safety-critical applications where material content and qualification are mandatory.
Is SMA5J33CAHM3/I unidirectional or bidirectional?
SMA5J33CAHM3/I is a bidirectional transient voltage suppressor, as confirmed by the 'CA' suffix in its part number. Its electrical characteristics - including symmetrical breakdown and clamping behavior - apply identically in both directions, and it carries no cathode band marking. This allows direct placement across AC-coupled or floating nodes without polarity concerns, unlike unidirectional 'A' variants such as SMA5J33A.
What is the clamping voltage of SMA5J33CAHM3/I and how is it measured?
The clamping voltage of SMA5J33CAHM3/I is 53.3 V, measured at a peak pulse current (IPPM) of 9.4 A using the standardized 10/1000 µs double-exponential waveform. This value represents the maximum voltage imposed on protected circuitry during a 500 W transient event and is specified at TA = 25 °C with devices mounted on 5.0 mm × 5.0 mm copper pads per JEDEC guidelines.
Can SMA5J33CAHM3/I replace SMA5J33A in an existing design?
No - SMA5J33CAHM3/I cannot directly replace SMA5J33A because they differ fundamentally in polarity: SMA5J33A is unidirectional (cathode-marked), while SMA5J33CAHM3/I is bidirectional (no marking). Swapping them would compromise protection on DC-biased lines and may cause forward conduction failure. A redesign evaluating circuit topology, bias conditions, and surge directionality is required before substitution.
What thermal derating applies to SMA5J33CAHM3/I above 25 °C ambient?
SMA5J33CAHM3/I must be derated linearly above TA = 25 °C per Figure 2 in the datasheet: peak pulse power decreases by approximately 0.4 %/°C, resulting in ~375 W at 85 °C ambient and ~250 W at 125 °C. This derating is based on RθJA = 80 °C/W and assumes mounting on the minimum recommended 5.0 mm × 5.0 mm copper pads; larger copper areas improve thermal performance.
SMA5J33CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMA5J33CAHM3/I FAQ
1.How can I place an order for SMA5J33CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J33CAHM3/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 SMA5J33CAHM3/I reliable?
The price and inventory of SMA5J33CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J33CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMA5J33CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J33CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J33CAHM3/I?
SMA5J33CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J33CAHM3/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 SMA5J33CAHM3/I?
For technical support, including SMA5J33CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J33CAHM3/I requirements.
6.How does Aetrix verify that SMA5J33CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMA5J33CAHM3/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 SMA5J33CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMA5J33CAHM3/I?
All SMA5J33CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J33CAHM3/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 SMA5J33CAHM3/I part is unused and in its original packaging.
Return procedure for SMA5J33CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J33CAHM3/I Tags
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