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Vishay General Semiconductor - Diodes Division SMAJ150CA-E3/5A
- Part No.:
- SMAJ150CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150CA-E3/5A.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,461
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Product details
Overview
SMAJ150CA-E3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 150 V standoff voltage (VWM), 167–185 V breakdown range (VBR at 1 mA), 243 V maximum clamping voltage (VC) at 1.2 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform). It is widely deployed to protect MOSFETs, ICs, and sensor interfaces in industrial motor drives and automotive body control modules.
For engineers reviewing the SMAJ150CA-E3/5A datasheet, SMAJ150CA-E3/5A pinout, SMAJ150CA-E3/5A application, or SMAJ150CA-E3/5A equivalent, key selection criteria include bidirectional clamping behavior, low thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification eligibility (via HE3/HM3 variants), and compatibility with automated SMT assembly on DO-214AC footprints.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 150 V), but triggers into low-impedance conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and fast response (<1 ns), enabling suppression of ESD, lightning-induced surges, and inductive switching spikes.
The SMAJ150CA-E3/5A is rated for repetitive 10/1000 μs transients at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above 78 V), with thermal performance validated on 5.0 mm × 5.0 mm copper pads. Its bidirectional symmetry eliminates polarity concerns in AC-coupled or floating signal paths, unlike unidirectional variants requiring cathode alignment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping onset |
| VBR (min/max) | 167 V / 185 V at 1 mA - Confirmed breakdown range ensuring reliable triggering across temperature and unit variation |
| VC @ IPPM | 243 V at 1.2 A - Clamped voltage during worst-case 10/1000 μs surge; determines protected circuit's maximum transient exposure |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge power handling capability with defined waveform; sets energy absorption limit |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); relevant for unidirectional fault analysis only |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard PCB pad layout; governs power derating above 25 °C |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial enclosures |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H), matte tin-plated leads, MSL Level 1 compliant (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction; conducts surge current equally in either direction during overvoltage events |
| Cathode | Transient current exit (bidirectional) | Second terminal of symmetrical junction; completes low-impedance path to ground or return rail during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection on AC lines, differential buses, or floating sensors without polarity constraints |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients common in 24 V industrial controls and 12 V automotive subsystems |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes voltage overshoot during suppression-critical for safeguarding 150 V-rated MOSFETs and gate drivers |
| MSL Level 1, 260 °C peak reflow | Supports lead-free reflow soldering without preconditioning; compatible with standard SMT production lines |
| AEC-Q101 qualification path | HE3/HM3 variants available for automotive applications requiring stress-tested reliability (e.g., BCM, lighting control) |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate driver ICs and high-side MOSFETs against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Shunt TVS placed across MOSFET drain-source or gate-source to clamp voltage spikes before they exceed absolute maximum ratings. Use Value: Limits transient voltage to ≤243 V, preventing destructive avalanche failure in 200 V-rated power devices while maintaining system uptime. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins from load dump and jump-start surges in door module electronics. IC Role / Device Role / Timing Role: Bidirectional clamping element connected between LIN line and chassis ground to suppress ±100 V transients within <1 ns. Use Value: Ensures uninterrupted communication during battery voltage excursions up to 40 V, meeting ISO 7637-2 Pulse 5a requirements. |
| Consumer Appliance Power Supplies | Telecom Signal Line Interfaces |
|
Use Scenario: Input-stage protection for offline SMPS controllers subjected to AC line surges and neutral-ground faults. IC Role / Device Role / Timing Role: Primary-side TVS across bulk capacitor terminals to absorb 1 kV/0.5 J line-to-line transients per IEC 61000-4-5. Use Value: Absorbs 400 W peak energy without degradation, extending capacitor and controller lifetime in washing machine and HVAC power stages. |
Use Scenario: Secondary-side protection of RS-485 transceivers in base station backhaul links exposed to induced lightning currents. IC Role / Device Role / Timing Role: Bidirectional TVS on differential pair (A/B) referenced to signal ground to clamp common-mode surges up to ±300 V. Use Value: Maintains data integrity by limiting differential voltage excursion to <250 V, preventing receiver latch-up or permanent damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ150A-E3/5A | Unidirectional; cathode-marked; VF = 3.5 V at 25 A (forward conduction only) | Requires correct polarity placement; unsuitable for AC or floating nodes | Select only when protecting DC rails with known polarity and where forward conduction may be leveraged for crowbar-like behavior |
| SMBJ150CA-T | Same VWM/VC, but SMB (DO-214AA) package: 5.28 mm × 4.50 mm footprint, 10% larger pad area, RθJA = 100 °C/W | Higher power handling margin due to lower thermal resistance; requires PCB layout change | Choose when higher surge repetition rate or extended ambient temperature operation (>85 °C) is required |
Compared with SMAJ150A-E3/5A, the SMAJ150CA-E3/5A eliminates polarity dependency for universal placement, while compared with SMBJ150CA-T, it trades 20 °C/W higher thermal resistance for space-constrained layouts-making it optimal for compact 24 V industrial I/O modules.
Availability
SMAJ150CA-E3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, consumer appliance power supplies, and telecom signal line interfaces requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ150CA-E3/5A 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, power efficiency, and automotive-grade qualification.
The SMAJ series targets cost-sensitive, high-volume transient protection needs in industrial, automotive, and consumer systems-designed for drop-in replacement of legacy TVS families while meeting modern AEC-Q101 and JEDEC MSL requirements.
FAQ
What is the clamping voltage of the SMAJ150CA-E3/5A under a 10/1000 μs surge?
The SMAJ150CA-E3/5A exhibits a maximum clamping voltage (VC) of 243 V when subjected to its rated peak pulse current of 1.2 A with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ150CA-E3/5A maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C).
Is the SMAJ150CA-E3/5A suitable for automotive applications?
The SMAJ150CA-E3/5A itself is commercial-grade (RoHS-compliant, MSL Level 1), but Vishay offers AEC-Q101 qualified versions under the HE3 and HM3 suffixes (e.g., SMAJ150CAHE3_A/I). These variants undergo stress testing per AEC-Q101 and are approved for automotive use in non-safety-critical modules like body electronics and infotainment. The SMAJ150CA-E3/5A may be used in less stringent automotive contexts if validated per customer requirements.
How does the bidirectional design of the SMAJ150CA-E3/5A affect PCB layout?
The SMAJ150CA-E3/5A has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies automated pick-and-place programming and reduces risk of assembly errors on differential or AC-coupled lines. Unlike unidirectional SMAJ150A-E3/5A-which requires cathode alignment-the SMAJ150CA-E3/5A can be rotated 180° on the DO-214AC footprint without functional impact.
What is the maximum steady-state power dissipation for the SMAJ150CA-E3/5A?
The SMAJ150CA-E3/5A has a maximum steady-state power dissipation (PD) of 3.3 W at an ambient temperature of 50 °C with infinite heatsinking. In typical PCB mounting (0.2″ × 0.2″ copper pads per terminal), derating begins above 25 °C per Figure 2 in the datasheet, reaching zero usable power at approximately 125 °C ambient. The SMAJ150CA-E3/5A is not intended for continuous power dissipation but for transient energy absorption.
Does the SMAJ150CA-E3/5A meet UL recognition standards?
Yes-the SMAJ150CA-E3/5A carries Underwriters Laboratory Recognition under UL 497B (QVGQ2) and file number E136766 for both unidirectional and bidirectional configurations. This certification confirms compliance with safety requirements for transient protectors used in telecommunications, industrial, and consumer equipment. The UL listing applies to the entire SMAJ family, including the SMAJ150CA-E3/5A.
SMAJ150CA-E3/5A 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ150CA-E3/5A FAQ
1.How can I place an order for SMAJ150CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150CA-E3/5A 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 SMAJ150CA-E3/5A reliable?
The price and inventory of SMAJ150CA-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ150CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ150CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150CA-E3/5A?
SMAJ150CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150CA-E3/5A 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 SMAJ150CA-E3/5A?
For technical support, including SMAJ150CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ150CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ150CA-E3/5A 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 SMAJ150CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ150CA-E3/5A?
All SMAJ150CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150CA-E3/5A, 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 SMAJ150CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ150CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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