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Vishay General Semiconductor - Diodes Division TPSMA33AHM3_B/H
- Part No.:
- TPSMA33AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA33AHM3_B/H.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,127
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Product details
Overview
TPSMA33AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features 33 V breakdown voltage (VBR = 31.4–34.7 V at 1 mA), 400 W peak pulse power (10/1000 µs), 45.7 V maximum clamping voltage at 8.8 A, 1.0 W steady-state power dissipation, and operates up to TJ = +185 °C - ideal for automotive power rail protection.
For engineers reviewing the TPSMA33AHM3_B/H datasheet, TPSMA33AHM3_B/H pinout, TPSMA33AHM3_B/H application, or TPSMA33AHM3_B/H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal derating curves, clamping performance under surge, and direct alternatives with documented differences in VBR, IPPM, and automotive compliance.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its unidirectional polarity enables robust clamping of positive-going transients while maintaining low leakage (<1 µA at VWM = 28.2 V) and fast response time.
The device is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), meets MSL Level 1 per J-STD-020 (peak reflow = 260 °C), and is halogen-free, RoHS-compliant, and AEC-Q101 qualified - confirming suitability for automotive ECUs and industrial control modules requiring long-term reliability under thermal stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 31.4 V / 33.0 V / 34.7 V at 1 mA - defines precise clamping onset threshold for overvoltage protection |
| VWM | 28.2 V - maximum continuous reverse operating voltage before leakage rises significantly |
| VC @ IPPM | 45.7 V at 8.8 A - actual clamped voltage during 400 W transient, critical for downstream IC survivability |
| PPPM | 400 W (10/1000 µs waveform) - peak surge energy handling capacity under standardized lightning/inductive-switching test |
| TJ max. | +185 °C - enables operation in engine bay or under-hood automotive environments without derating |
| IR @ VWM | ≤1.0 µA at 25 °C - ensures minimal standby power loss and signal integrity on protected lines |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with cathode band marking and 0.2" × 0.2" pad layout requirement |
Pinout & Package
SMA (DO-214AC) package with axial lead configuration: molded plastic body, matte tin-plated terminals solderable per J-STD-002, cathode identified by color band. Mounting requires 5.0 mm × 5.0 mm copper pads per terminal per Vishay's thermal derating guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction or transient clamping | Connected to protected line (e.g., 24 V rail); must be routed with low-inductance path to ground reference |
| Cathode | Current exit point during clamping; marked by color band | Connected to system ground or low-impedance return path; determines unidirectional clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for ECU and ADAS module designs |
| Junction passivation | Reduces surface leakage and improves long-term stability under humidity and bias stress - critical for 15+ year automotive service life |
| MSL Level 1 | Zero moisture sensitivity; supports standard SMT reflow up to 260 °C peak without preconditioning or baking |
| Halogen-free & RoHS | Complies with automotive material restrictions (JESD201 Class 2 whisker resistance) and global environmental regulations |
| 185 °C junction rating | Enables placement near heat sources (e.g., power MOSFETs, DC/DC converters) without thermal shutdown or parameter drift |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamping |
|---|---|
Use Scenario: Protecting 24 V supply inputs in engine control units against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between battery feed and LDO input. Use Value: Limits transient voltage to ≤45.7 V, preventing damage to 36 V-rated regulators and microcontrollers per ISO 7637-2 Pulse 5a. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and inductive switching noise in factory automation sensors. IC Role / Device Role / Timing Role: Fast-response shunt protector on sensor transmitter output, referenced to local ground. Use Value: Sub-nanosecond response and <1 µA leakage preserve signal accuracy while absorbing ±8 kV contact ESD per IEC 61000-4-2. |
| Telecom DC Power Interface | Consumer Device USB Port Surge Suppression |
Use Scenario: Safeguarding -48 V telecom power feeds from lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: Primary clamping device on PSE-side DC input, coordinated with upstream fuses. Use Value: 400 W peak power rating handles 10/1000 µs surges up to 8.8 A, meeting Telcordia GR-1089-CORE requirements. |
Use Scenario: Adding secondary-level surge immunity to USB Type-A power pins in smart home hubs exposed to user-handling ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS across VBUS and GND, placed after connector but before USB controller. Use Value: 45.7 V clamping prevents latch-up in 5 V tolerant PHYs; halogen-free construction satisfies consumer RoHS/REACH mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33AHE3_A/H | Same VBR range (31.4–34.7 V), identical 400 W PPPM, but rated only to TJ = +150 °C and not AEC-Q101 qualified | Limited to commercial/industrial use; unsuitable for under-hood automotive deployment | Select when cost sensitivity outweighs automotive qualification and extended temperature needs |
| TPSMA33AHM3_B/I | Identical electrical and thermal specs; differs only in packaging - 7500-piece 13" tape-and-reel vs. 1800-piece 7" reel | No functional difference; choice driven by production volume and SMT line feeder compatibility | Select for high-volume automated assembly requiring larger reels and reduced changeover frequency |
Compared with SMAJ33AHE3_A/H, TPSMA33AHM3_B/H provides +35 °C higher junction temperature capability and AEC-Q101 validation - essential for automotive safety-critical systems. Against TPSMA33AHM3_B/I, it offers identical protection performance but optimized for mid-volume builds with smaller reel logistics.
Availability
TPSMA33AHM3_B/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power systems requiring stable component supply, long-lifecycle assurance, and AEC-Q101-compliant surge protection.
Supply support for TPSMA33AHM3_B/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, TVS devices, and optoelectronics with emphasis on reliability, thermal performance, and automotive qualification.
The TPSMA33AHM3_B/H belongs to Vishay's PAR® family of high-power surface-mount TVS diodes, engineered specifically for harsh-environment transient suppression where AEC-Q101 compliance, 185 °C operation, and repeatable clamping are mandatory.
FAQ
What is the clamping voltage of the TPSMA33AHM3_B/H at its rated peak pulse current?
The TPSMA33AHM3_B/H has a maximum clamping voltage (VC) of 45.7 V at its rated peak pulse current (IPPM) of 8.8 A, measured using the standardized 10/1000 µs waveform. This value ensures protected downstream components-such as 36 V-rated regulators or microcontrollers-remain within safe operating limits during surge events. The TPSMA33AHM3_B/H maintains this clamping performance across its full operating temperature range up to +185 °C junction temperature.
Is the TPSMA33AHM3_B/H AEC-Q101 qualified, and what does that mean for automotive use?
Yes, the TPSMA33AHM3_B/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88405. This qualification validates performance across temperature cycling, high-temperature reverse bias, and ESD testing per automotive reliability standards. For automotive applications, the TPSMA33AHM3_B/H is approved for use in engine control units, body electronics, and ADAS modules where sustained operation at +185 °C and immunity to load dump transients are required.
How does the TPSMA33AHM3_B/H differ from the HE3-suffixed version (e.g., TPSMA33AHE3_B/H)?
The TPSMA33AHM3_B/H is halogen-free, RoHS-compliant, and AEC-Q101 qualified, whereas the HE3-suffixed variant (e.g., TPSMA33AHE3_B/H) is RoHS-compliant and AEC-Q101 qualified but not halogen-free. Both share identical electrical specifications (VBR, VC, PPPM, TJ max.), but the HM3 version meets stricter material content requirements for automotive OEMs mandating halogen-free PCB assemblies. The TPSMA33AHM3_B/H also passes JESD201 Class 2 whisker testing, enhancing long-term solder joint reliability.
What is the maximum reverse leakage current of the TPSMA33AHM3_B/H at its stand-off voltage?
The TPSMA33AHM3_B/H exhibits a maximum reverse leakage current (IR) of 1.0 µA at its stand-off voltage (VWM) of 28.2 V and ambient temperature of 25 °C. At elevated temperatures (e.g., 150 °C), leakage remains ≤1000 µA - a value explicitly specified in the Vishay datasheet. This low leakage preserves signal integrity on sensitive analog lines and minimizes quiescent power loss in always-on automotive modules, confirming the TPSMA33AHM3_B/H's suitability for low-power, high-reliability designs.
Can the TPSMA33AHM3_B/H be used in bidirectional transient protection applications?
No, the TPSMA33AHM3_B/H is unidirectional only, as stated in the Vishay datasheet under FEATURES and PRIMARY CHARACTERISTICS. It clamps positive transients relative to its cathode and conducts only in the reverse direction - making it unsuitable for AC line or bidirectional signal protection. For bidirectional applications, engineers must select a dedicated bidirectional TVS such as the SMBJ33CAHM3_B/H. Using the TPSMA33AHM3_B/H in bidirectional configurations risks failure during negative-going surges, as the device lacks symmetrical breakdown behavior.
TPSMA33AHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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 ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
TPSMA33AHM3_B/H FAQ
1.How can I place an order for TPSMA33AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA33AHM3_B/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 TPSMA33AHM3_B/H reliable?
The price and inventory of TPSMA33AHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPSMA33AHM3_B/H is usually 5 days.
3.What payment methods are accepted for TPSMA33AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA33AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA33AHM3_B/H?
TPSMA33AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA33AHM3_B/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 TPSMA33AHM3_B/H?
For technical support, including TPSMA33AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA33AHM3_B/H requirements.
6.How does Aetrix verify that TPSMA33AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All TPSMA33AHM3_B/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 TPSMA33AHM3_B/H meets industry standards.
7.What is the process for return or replacement of TPSMA33AHM3_B/H?
All TPSMA33AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA33AHM3_B/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 TPSMA33AHM3_B/H part is unused and in its original packaging.
Return procedure for TPSMA33AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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