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Vishay General Semiconductor - Diodes Division TPSMA18AHE3_B/I
- Part No.:
- TPSMA18AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA18AHE3_B/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,737
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Product details
Overview
TPSMA18AHE3_B/I 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 18.0 V nominal breakdown voltage (VBR), 15.3 V stand-off voltage (VWM), 25.5 V maximum clamping voltage (VC) at 15.9 A peak pulse current, 400 W peak pulse power (10/1000 µs), and operates up to +185 °C junction temperature - ideal for automotive power rail protection.
For engineers reviewing the TPSMA18AHE3_B/I datasheet, TPSMA18AHE3_B/I pinout, TPSMA18AHE3_B/I application, or TPSMA18AHE3_B/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (HE3 suffix), MSL Level 1 rating, 1.0 W steady-state power dissipation, and compatibility with high-reliability PCB layouts using 5.0 mm × 5.0 mm copper pads per terminal.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology with optimized junction passivation for stable clamping under repetitive surge stress. Its 10/1000 µs waveform response delivers consistent 400 W peak pulse power handling while maintaining low incremental surge resistance and fast response time - critical for protecting MOSFETs and ICs against inductive switching spikes.
The device is rated for TJ = −65 °C to +185 °C, supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and exhibits a positive temperature coefficient of VBR (+0.080 %/°C), enabling predictable voltage shift across automotive thermal profiles without derating ambiguity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 17.1 V / 18.0 V / 18.9 V at 1.0 mA - defines precise clamping onset threshold for overvoltage detection |
| VWM | 15.3 V - maximum continuous reverse voltage before leakage exceeds 1.0 µA, sets safe operating margin below VBR |
| VC @ IPPM | 25.5 V at 15.9 A - peak clamped voltage during 400 W transient, determines protected circuit's worst-case overvoltage exposure |
| PPPM | 400 W (10/1000 µs) - standardized surge energy absorption capacity, validated per ANSI/IEEE C62.35 |
| TJ max. | +185 °C - enables operation in under-hood automotive environments and high-power industrial enclosures without thermal shutdown |
| Polarity | Unidirectional - blocks reverse conduction only; requires correct orientation relative to protected line polarity |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with cathode band marking, compatible with automated pick-and-place |
Pinout & Package
SMA (DO-214AC) package with molded epoxy body, matte tin-plated leads solderable per J-STD-002, and cathode indicated by a color band. Mounting requires minimum 5.0 mm × 5.0 mm copper pad area per terminal for thermal and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VLINE exceeds VBR |
| Anode | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per JESD22 standards |
| Junction passivation optimized design | Reduces parameter drift and leakage increase under high-temperature storage and repeated surge stress |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without moisture sensitivity concerns or baking requirements |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for sensitive downstream ICs |
| 185 °C junction capability | Supports placement near heat sources (e.g., power converters) without derating or thermal runaway risk |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamping |
|---|---|
Use Scenario: Suppressing load-dump and jump-start transients on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and chassis ground to clamp surges above 15.3 V. Use Value: Limits peak voltage to ≤25.5 V during 400 W transients, preventing damage to 36 V-rated CAN transceivers and microcontrollers. |
Use Scenario: Protecting analog outputs of pressure/temperature sensors in motor drives and PLC I/O modules. IC Role / Device Role / Timing Role: Standoff-mode TVS connected across sensor output and reference ground to absorb ESD and switching noise. Use Value: Maintains <1.0 µA leakage at 15.3 V, preserving sensor accuracy while clamping 8 kV contact ESD per IEC 61000-4-2. |
| Consumer Device DC Input Protection | Telecom Power Supply Surge Suppression |
Use Scenario: Safeguarding USB-C PD input stages and AC/DC adapter secondary-side rails in smart home hubs. IC Role / Device Role / Timing Role: Primary-level TVS on 5–20 V input bus to absorb plug-in surges and hot-swap transients. Use Value: Withstands 40 A 8.3 ms surge (IFSM), ensuring robustness against accidental short-circuit recovery events. |
Use Scenario: Front-end protection of PoE-powered equipment (e.g., IP cameras, wireless access points) against lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-side TVS on 48 V DC distribution bus, coordinated with upstream GDTs and MOVs. Use Value: Delivers 400 W pulse power handling with 0.080 %/°C VBR tempco, enabling stable coordination in multi-stage protectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same SMA package, 18 V VBR, but rated for 400 W (10/1000 µs) with higher VC = 29.2 V; not AEC-Q101 qualified | Lacks automotive qualification and 185 °C rating; suitable for commercial/industrial use only | Select SMAJ18A only if AEC-Q101 compliance and extended temperature operation are not required |
| 1.5SMC18A | Higher power (1500 W), DO-214AB package (larger footprint), VC = 29.2 V, same VBR range; RoHS-compliant but not AEC-Q101 qualified | Requires PCB layout change due to larger SMC package; better for high-energy surges but less space-efficient | Choose 1.5SMC18A when surge energy exceeds 400 W and board space allows DO-214AB mounting |
Compared with SMAJ18A and 1.5SMC18A, the TPSMA18AHE3_B/I uniquely combines AEC-Q101 qualification, +185 °C operation, and SMA footprint - making it the only option among the three qualified for under-hood automotive deployment without package or thermal compromise.
Availability
TPSMA18AHE3_B/I is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and telecom power supply surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for TPSMA18AHE3_B/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 high-temperature performance.
The TPSMA series belongs to Vishay's PAR® transient voltage suppressor product line, engineered specifically for robust, high-temperature-stable clamping in automotive, industrial, and telecom infrastructure applications.
FAQ
What is the exact breakdown voltage tolerance for TPSMA18AHE3_B/I?
The TPSMA18AHE3_B/I has a guaranteed breakdown voltage (VBR) range of 17.1 V to 18.9 V at 1.0 mA test current, with 18.0 V as the nominal value. This ±5.3% tolerance is specified per the Vishay datasheet revision 23-Jan-2024 (Document Number: 88405), and applies strictly at TA = 25 °C unless adjusted using the +0.080 %/°C temperature coefficient.
Is TPSMA18AHE3_B/I suitable for bidirectional transient suppression?
No, TPSMA18AHE3_B/I is unidirectional only, as confirmed in the "FEATURES" section of the Vishay datasheet. It conducts surge current only when the cathode is more positive than the anode. For bidirectional protection, a separate device such as the TPSMA18CA (center-tapped or dual-diode configuration) would be required - the TPSMA18AHE3_B/I does not support reverse-polarity clamping.
Does TPSMA18AHE3_B/I require derating at elevated ambient temperatures?
Yes, TPSMA18AHE3_B/I must be derated above TA = 25 °C per Figure 2 in the Vishay datasheet. Its peak pulse power (PPPM) decreases linearly with increasing junction temperature, reaching ~50% of 400 W at TJ ≈ 125 °C. The 185 °C maximum junction rating allows operation at high ambient temperatures only when PCB copper pad area and airflow meet the 5.0 mm × 5.0 mm thermal pad requirement.
What does the "HE3" suffix indicate in TPSMA18AHE3_B/I?
The "HE3" suffix in TPSMA18AHE3_B/I denotes RoHS-compliant construction and AEC-Q101 qualification per Vishay's ordering nomenclature. It also confirms compliance with JESD201 Class 2 whisker resistance and MSL Level 1 reflow profile (peak 260 °C), distinguishing it from non-automotive variants like "H" or "HM3" (halogen-free).
Can TPSMA18AHE3_B/I be used in parallel for higher surge current handling?
No - parallel connection of TPSMA18AHE3_B/I devices is not recommended due to VBR mismatch (±0.9 V tolerance) causing current imbalance and premature failure of the lower-VBR unit. The datasheet specifies single-device operation only; for higher current, select a higher-rated part such as TPSMA22AHE3_B/I or verify coordination with external current-sharing resistors.
TPSMA18AHE3_B/I 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):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.5V
- Current - Peak Pulse (10/1000µs):
- 15.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
TPSMA18AHE3_B/I FAQ
1.How can I place an order for TPSMA18AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA18AHE3_B/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 TPSMA18AHE3_B/I reliable?
The price and inventory of TPSMA18AHE3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPSMA18AHE3_B/I is usually 5 days.
3.What payment methods are accepted for TPSMA18AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA18AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA18AHE3_B/I?
TPSMA18AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA18AHE3_B/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 TPSMA18AHE3_B/I?
For technical support, including TPSMA18AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA18AHE3_B/I requirements.
6.How does Aetrix verify that TPSMA18AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All TPSMA18AHE3_B/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 TPSMA18AHE3_B/I meets industry standards.
7.What is the process for return or replacement of TPSMA18AHE3_B/I?
All TPSMA18AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA18AHE3_B/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 TPSMA18AHE3_B/I part is unused and in its original packaging.
Return procedure for TPSMA18AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPSMA18AHE3_B/I Tags
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