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Vishay General Semiconductor - Diodes Division SMAJ150CAHE3_A/I
- Part No.:
- SMAJ150CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150CAHE3_A/I.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,624
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Product details
Overview
SMAJ150CAHE3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 150 V stand-off voltage (VWM), 167–185 V breakdown voltage (VBR) at 1 mA, 243 V maximum clamping voltage (VC) at 1.2 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supplies.
For engineers reviewing the SMAJ150CAHE3_A/I datasheet, SMAJ150CAHE3_A/I pinout, SMAJ150CAHE3_A/I application, or SMAJ150CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, 150 V working voltage compatibility with 24 V–48 V DC bus systems, AEC-Q101 qualification for automotive environments, and SMA package suitability for automated SMT assembly with MSL Level 1 reflow profile.
Technical Context
This device operates as a voltage-clamping protector using an avalanche junction structure, responding within <1 ps to transient overvoltages. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity concerns in AC-coupled or floating signal paths.
The SMAJ150CAHE3_A/I delivers 400 W peak pulse power (derated to 300 W above 78 V), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable operation up to +150 °C junction temperature under defined PCB pad layouts (0.2" × 0.2" copper per terminal).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before clamping initiates; matches 24 V/48 V DC bus hold-up and CAN/LIN line protection requirements. |
| VBR (min/max) | 167 V / 185 V at 1 mA - Confirmed breakdown range ensures predictable turn-on margin above VWM; guarantees clamping activation only during overvoltage events. |
| VC @ IPPM | 243 V at 1.2 A - Clamped voltage under full-rated 10/1000 μs surge; defines worst-case stress on downstream circuitry during IEC 61000-4-5 Level 3/4 surges. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy handling capacity with standard 10/1000 μs waveform; determines survivability against lightning-induced or inductive-switching transients. |
| ID @ VWM | 1.0 μA - Reverse leakage at rated stand-off voltage; ensures negligible standby power loss and no interference with high-impedance sensor bias networks. |
| TJ max. | +150 °C - Maximum junction temperature rating; supports under-hood automotive placement and industrial ambient conditions without derating. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 2.54 mm lead pitch; compatible with J-STD-020 MSL Level 1 reflow (260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance. Bidirectional construction means no polarity marking - both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve identically as clamping nodes; no cathode band marking; enables placement in AC or floating circuits without orientation check. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity testing, and surge endurance - required for engine control, ADAS, and body electronics. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 combination wave surges up to 2 kV open-circuit / 1 kA short-circuit without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients - critical for protecting 16-bit ADC inputs and low-voltage logic interfaces. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and single-reflow processing at 260 °C peak - eliminates baking requirements and streamlines high-volume SMT production. |
| Glass passivated junction | Ensures stable VBR and low leakage over 15+ year field life; prevents parametric drift in humid or thermally cycled environments. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 24 V supply rails feeding ECUs, lighting modules, and actuators against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC/DC converters and LDOs to limit input voltage excursion during transients. Use Value: Maintains system uptime by preventing latch-up or burnout of PMICs and microcontrollers during 12 V/24 V vehicle battery disturbances. |
Use Scenario: ESD and surge protection on analog output lines (e.g., 4–20 mA current loops, 0–10 V sensors) in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional shunt clamp across signal and return paths to suppress ±8 kV contact ESD (IEC 61000-4-2) and 1 kV ring wave surges. Use Value: Preserves measurement accuracy by limiting voltage excursion to <243 V, preventing op-amp saturation and ADC overrange errors. |
| Telecom DC Power Feeds | Consumer Device USB/Type-C VBUS |
Use Scenario: Secondary-side transient suppression on -48 V telecom rectifier outputs feeding base station RF modules and backplane controllers. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between -48 V rail and chassis ground to clamp common-mode surges induced by nearby lightning strikes. Use Value: Enables compliance with GR-1089-CORE Section 4.5.2 surge immunity while maintaining <1 μA leakage to avoid affecting -48 V float voltage regulation. |
Use Scenario: Overvoltage protection on USB Type-C VBUS lines exposed to hot-plug incompatibility or adapter faults. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp between VBUS and GND to absorb 20 V–28 V fault conditions before USB PD controller shutdown. Use Value: Prevents permanent damage to USB-C port controllers and multiplexers during 15 V sustained overvoltage events per USB PD 3.1 specification Annex A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ150CA-M3 | Same electrical specs and AEC-Q101 qualification; halogen-free molding compound (HM3 suffix variant not applicable - HE3 denotes RoHS+AEC-Q101, M3 denotes halogen-free+RoHS only). | No automotive qualification; suitable for commercial/industrial use where halogen-free compliance is mandated but automotive reliability is not required. | Select SMAJ150CA-M3 only if halogen-free material is mandatory and AEC-Q101 is unnecessary; otherwise SMAJ150CAHE3_A/I remains preferred for automotive designs. |
| SMBJ150CAHE3_A/I | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; 600 W peak pulse power rating (vs. 400 W); higher thermal mass and lower RθJA (80 °C/W vs. 120 °C/W). | Better suited for higher-energy surge environments (e.g., outdoor telecom cabinets, solar charge controllers) where PCB space allows SMB footprint. | Choose SMBJ150CAHE3_A/I when surge energy exceeds 400 W capability or when board layout permits larger package; SMAJ150CAHE3_A/I remains optimal for space-constrained automotive modules. |
Compared with SMAJ150CA-M3, the SMAJ150CAHE3_A/I adds AEC-Q101 qualification for automotive deployment; compared with SMBJ150CAHE3_A/I, it trades 200 W pulse power headroom and thermal margin for 30 % smaller PCB area and identical reflow compatibility - making it ideal for compact, automotive-grade power rail protection.
Availability
SMAJ150CAHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU power protection, industrial sensor interface hardening, and telecom DC feed surge suppression requiring stable component supply, AEC-Q101 traceability, and consistent SMA package delivery.
Supply support for SMAJ150CAHE3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated through proven clamping performance and qualification rigor.
FAQ
What is the clamping voltage of SMAJ150CAHE3_A/I at its rated peak pulse current?
The SMAJ150CAHE3_A/I has a maximum clamping voltage (VC) of 243 V at 1.2 A peak pulse current (IPPM), measured with a 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during standardized surge events and is confirmed in Vishay's datasheet Document Number 88390, page 2. The clamping occurs rapidly (<1 ps response time) and sustains for the full pulse duration without thermal runaway.
Is SMAJ150CAHE3_A/I suitable for automotive applications?
Yes, SMAJ150CAHE3_A/I is AEC-Q101 qualified, as indicated by the "HE3" suffix per Vishay's ordering nomenclature guide (Document Number 88390, page 3). It undergoes stress testing for temperature cycling, mechanical shock, and surge endurance required for under-hood and chassis-mounted automotive electronics. Its 150 V VWM and 243 V VC align with 24 V system protection needs in ADAS, body control, and powertrain modules.
What does the "CA" suffix mean in SMAJ150CAHE3_A/I?
The "CA" suffix in SMAJ150CAHE3_A/I denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional "A" variants (e.g., SMAJ150A), the CA version has no polarity marking and functions identically regardless of terminal orientation, making it ideal for AC-coupled lines, differential buses, or floating grounds where polarity cannot be guaranteed.
What is the maximum operating temperature for SMAJ150CAHE3_A/I?
The SMAJ150CAHE3_A/I has a maximum junction temperature (TJ max.) of +150 °C, as specified in the "Maximum Ratings" table (page 1 of datasheet 88390). This rating applies under defined thermal conditions - specifically when mounted on 0.2" × 0.2" copper pads per terminal. Derating is required above +25 °C ambient, per Figure 2 in the same document, ensuring safe operation in under-hood automotive or industrial enclosures.
How does SMAJ150CAHE3_A/I differ from SMAJ150AHE3_A/I?
SMAJ150CAHE3_A/I is bidirectional with symmetrical clamping in both polarities and no cathode band marking, whereas SMAJ150AHE3_A/I is unidirectional - featuring a cathode band and conducting only in reverse bias. The unidirectional version exhibits forward voltage drop (~3.5 V at 25 A) and is used where polarity is fixed (e.g., DC power input), while the CA variant eliminates orientation dependency for AC or floating signal protection - a key distinction confirmed in Vishay's "DEVICES FOR BIDIRECTION APPLICATIONS" section (page 1).
SMAJ150CAHE3_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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 150V
- Voltage - Breakdown (Min):
- 167V
- Voltage - Clamping (Max) @ Ipp:
- 243V
- Current - Peak Pulse (10/1000µs):
- 1.2A
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ150CAHE3_A/I FAQ
1.How can I place an order for SMAJ150CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150CAHE3_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 SMAJ150CAHE3_A/I reliable?
The price and inventory of SMAJ150CAHE3_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 SMAJ150CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ150CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150CAHE3_A/I?
SMAJ150CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150CAHE3_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 SMAJ150CAHE3_A/I?
For technical support, including SMAJ150CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ150CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ150CAHE3_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 SMAJ150CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ150CAHE3_A/I?
All SMAJ150CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150CAHE3_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 SMAJ150CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ150CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ150CAHE3_A/I Tags
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