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Vishay General Semiconductor - Diodes Division SMA5J33AHM3/I
- Part No.:
- SMA5J33AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J33AHM3/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,189
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Product details
Overview
SMA5J33AHM3/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 power and signal lines. It features a 33 V standoff voltage (VWM), 36.7–40.6 V breakdown voltage (VBR), 500 W peak pulse power (10/1000 µs), 9.4 A peak pulse current (IPPM), and clamps to ≤53.3 V at rated surge. It is used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supplies.
For engineers reviewing the SMA5J33AHM3/I datasheet, SMA5J33AHM3/I pinout, SMA5J33AHM3/I application, or SMA5J33AHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 80 °C/W), polarity marking (cathode band), and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, conducting only when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM), while its low incremental surge resistance enables rapid energy dissipation during transients induced by inductive switching or ESD events.
The SMA5J33AHM3/I is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 (260 °C reflow peak), and is qualified to AEC-Q101 for automotive use. Its unidirectional polarity requires correct cathode-band orientation during PCB layout to avoid forward conduction in normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on across production lots. |
| IPPM | 9.4 A (10/1000 µs) - Peak surge current capability; determines maximum transient energy (500 W) it can absorb without failure. |
| VC | ≤53.3 V at IPPM - Clamping voltage under full-rated surge; must stay below protected device's absolute maximum rating. |
| RθJA | 80 °C/W - Junction-to-ambient thermal resistance; dictates required copper pad area (0.2" × 0.2") for reliable power derating above 25 °C. |
| TJ max | +150 °C - Maximum junction temperature; sets upper limit for thermal design and long-term reliability under repeated surges. |
| Polarity | Unidirectional - Cathode marked by band; blocks forward current until VF ≈ 3.5 V at 25 A, enabling DC-biased protection. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side of protected line; reverse-biased during surge to conduct to ground/rail. |
| Cathode | Clamping output / Surge return path | Marked by band; connected to higher-potential side (e.g., VIN or signal line); sinks surge current to common reference. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per stress test conditions. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms halogen-free molding compound and lead finish, meeting automotive and industrial environmental compliance requirements. |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR = ~16.6 V) and faster response to sub-microsecond transients without oscillation. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C) without baking, simplifying SMT manufacturing. |
| Glass-passivated junction | Provides stable VBR tolerance, low leakage (<1 µA), and immunity to humidity-induced parameter drift over time. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load-dump transients up to ISO 7637-2 Pulse 5a (110 V, 400 ms). IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between VBAT and chassis ground, absorbing energy before upstream regulator or MCU input. Use Value: Withstands 500 W surges and clamps to ≤53.3 V, keeping downstream 36 V-rated regulators within safe operating area. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in PLC I/O modules exposed to field wiring transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on 4–20 mA loop or 0–10 V analog output, shunting fast spikes before ADC input stage. Use Value: Low capacitance and <1 µA leakage preserve signal integrity; 9.4 A IPPM handles typical 1 kV EFT bursts per IEC 61000-4-4. |
| DC-DC Converter Input Protection | Motor Drive Gate Driver Protection |
Use Scenario: Shielding buck converter inputs in telecom power systems from lightning-induced surges on 48 V distribution rails. IC Role / Device Role / Timing Role: Primary surge clamp ahead of input filter and controller IC, sized to handle repetitive 10/1000 µs threats. Use Value: 500 W PPPM rating and 80 °C/W RθJA allow sustained operation with minimal thermal rise on standard 5 mm × 5 mm pads. |
Use Scenario: Preventing gate oxide damage in 600 V half-bridge MOSFETs caused by Miller-induced voltage spikes during high-dI/dt switching. IC Role / Device Role / Timing Role: Localized TVS across gate-source terminals or bootstrap supply rail to clamp overshoot exceeding ±20 V. Use Value: Fast response and low VC ensure gate voltage stays within ±20 V absolute max, avoiding destructive avalanche or latch-up. |
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 | Same electrical specs, but RoHS-compliant commercial grade (E3) without AEC-Q101 qualification; uses standard SnPb-free plating. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMA5J33AHE3/A for cost-sensitive non-automotive applications requiring identical clamping performance. |
| SMA6J33A-M3/5A | Higher 600 W PPPM rating, same VWM/VBR, but larger SMA package variant with different thermal resistance (RθJA = 65 °C/W). | Supports higher surge repetition rates due to improved thermal dissipation; requires revised pad layout. | Choose SMA6J33A-M3/5A when system-level surge testing exceeds 500 W single-event limits or demands extended duty cycle. |
Compared with SMA5J33AHM3/I, SMA5J33AHE3/A offers identical clamping but no automotive qualification, while SMA6J33A-M3/5A provides 20 % higher surge power at the cost of larger footprint and layout revision-neither is pin-compatible without verification of mechanical fit and thermal pad design.
Availability
SMA5J33AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and DC-DC converter input stages requiring stable component supply with AEC-Q101 assurance and halogen-free compliance.
Supply support for SMA5J33AHM3/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 SMA5J33AHM3/I belongs to Vishay's TRANSZORB® high-power TVS family, engineered for robust transient suppression in harsh environments including automotive power nets and industrial control systems.
FAQ
What is the clamping voltage of the SMA5J33AHM3/I under full-rated surge current?
The SMA5J33AHM3/I clamps to a maximum of 53.3 V when subjected to its rated 9.4 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured and guaranteed per Vishay Document Number 88875, ensuring protected circuits remain below critical voltage thresholds during surge events. The SMA5J33AHM3/I achieves this clamping performance while maintaining low leakage and stable breakdown across temperature.
Is the SMA5J33AHM3/I qualified for automotive applications?
Yes, the SMA5J33AHM3/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's 88875 datasheet. This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and surge endurance-making the SMA5J33AHM3/I suitable for under-hood and body-control module applications where reliability under thermal and electrical stress is mandatory.
What does the "HM3" suffix indicate for the SMA5J33AHM3/I?
The "HM3" suffix on SMA5J33AHM3/I denotes halogen-free, RoHS-compliant construction with matte tin-plated leads that meet JESD201 Class 2 whisker resistance. It also signifies AEC-Q101 qualification and packaging in 7" tape-and-reel (code H). This distinguishes SMA5J33AHM3/I from commercial-grade variants like SMA5J33A-E3 and confirms compliance with stringent automotive material and process standards.
How is polarity identified on the SMA5J33AHM3/I package?
The SMA5J33AHM3/I uses a visible cathode band on the SMA (DO-214AC) case to identify the cathode terminal. During PCB layout, the banded end must connect to the higher-potential node (e.g., VIN or signal line), while the anode connects to ground or lower-potential reference. This unidirectional configuration ensures proper clamping action and prevents unintended forward conduction in normal operation.
What thermal derating applies to the SMA5J33AHM3/I above 25 °C ambient?
The SMA5J33AHM3/I must be derated linearly above 25 °C ambient per Figure 2 in Vishay Document 88875, based on its RθJA of 80 °C/W. For example, at 85 °C ambient, maximum allowable power drops to approximately 312 W (500 W × [1 − (85 − 25)/125]). Derating ensures junction temperature remains ≤150 °C when mounted on the specified 0.2" × 0.2" copper pads-critical for long-term reliability of the SMA5J33AHM3/I.
SMA5J33AHM3/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:
- 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/I FAQ
1.How can I place an order for SMA5J33AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J33AHM3/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/I reliable?
The price and inventory of SMA5J33AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMA5J33AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J33AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J33AHM3/I?
SMA5J33AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J33AHM3/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/I?
For technical support, including SMA5J33AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J33AHM3/I requirements.
6.How does Aetrix verify that SMA5J33AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMA5J33AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMA5J33AHM3/I?
All SMA5J33AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J33AHM3/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/I part is unused and in its original packaging.
Return procedure for SMA5J33AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J33AHM3/I Tags
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