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Vishay General Semiconductor - Diodes Division SMAJ150-E3/5A
- Part No.:
- SMAJ150-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150-E3/5A.pdf
- Description:
- TVS DIODE 150VWM 268VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,426
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Product details
Overview
SMAJ150-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 150 V stand-off voltage (VWM), 268 V maximum clamping voltage (VC) at 1.1 A peak pulse current, 400 W peak pulse power rating (10/1000 µs waveform), and operates across –55 °C to +150 °C junction temperature range. It is commonly deployed on power rails and signal lines of industrial motor drives and telecom interface circuits.
For engineers reviewing the SMAJ150-E3/5A datasheet, SMAJ150-E3/5A pinout, SMAJ150-E3/5A application, or SMAJ150-E3/5A equivalent, this page provides verified electrical parameters, thermal resistance values (RθJA = 120 °C/W), JEDEC-compliant MSL level 1 handling data, RoHS-compliant matte tin plating, and real-world clamping performance under standardized surge waveforms - all critical for ESD/surge protection design validation and BOM selection.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds its 150 V stand-off threshold, it avalanches to limit transient energy with low incremental surge resistance and fast response time (<1 ns). Its glass-passivated junction ensures stable breakdown behavior and long-term reliability under repetitive surge stress.
The device is rated for 400 W peak pulse power (10/1000 µs) up to 78 V, derated to 300 W above that voltage - confirmed for SMAJ150-E3/5A per Fig. 2 in Document 88390. It supports 40 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits 1.0 µA maximum reverse leakage at VWM, enabling low-power system compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 120–140 V DC bus applications. |
| VC @ IPPM | 268 V - Clamped voltage at 1.1 A peak pulse current; determines maximum stress imposed on downstream ICs during surge events. |
| PPPM | 400 W - Peak pulse power dissipation capability with 10/1000 µs waveform; validates robustness against IEC 61000-4-5 Level 4 surges. |
| IPPM | 1.1 A - Peak pulse current corresponding to VC; used with PCB trace impedance to estimate actual clamping performance in layout. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on 0.2 × 0.2″ copper pads; informs derating requirements for sustained surge duty cycles. |
| TJ Range | –55 °C to +150 °C - Operating and storage temperature range; supports deployment in under-hood automotive and industrial environments. |
| ID @ VWM | 1.0 µA - Maximum reverse leakage at 150 V; ensures minimal standby power loss in battery-backed or low-quiescent systems. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-ended unidirectional configuration. Cathode indicated by band-marked end; anode is unmarked lead.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode (unmarked end) | Reference/ground return path | Typically tied to system ground plane; completes shunt path for transient energy diversion. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable breakdown voltage and long-term reliability under thermal cycling and humidity exposure. |
| MSL Level 1 compliance | Enables standard SMT reflow without moisture-related popcorning; peak reflow temperature up to 260 °C supported. |
| RoHS-compliant matte tin plating | Meets J-STD-002 and JESD22-B102 solderability standards; eliminates lead-based finishes while ensuring consistent wetting. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic interfaces. |
| 400 W peak pulse power (≤78 V) | Validates suitability for IEC 61000-4-5 surge immunity testing at 2 kV/12 Ω coupling network impedance. |
Applications
| Industrial Motor Drives | Telecom Line Interfaces |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback sensors in 100–150 V DC bus inverters exposed to back-EMF spikes from brushless motors. IC Role / Device Role / Timing Role: Shunt clamping element placed between high-side MOSFET source and ground, triggered within nanoseconds of overvoltage onset. Use Value: Limits transient voltage to ≤268 V, preventing gate oxide rupture in 200 V-rated Si MOSFETs and maintaining functional safety integrity. |
Use Scenario: Surge suppression on RS-485/RS-232 data lines in outdoor base station cabinets subject to lightning-induced common-mode transients. IC Role / Device Role / Timing Role: Unidirectional TVS connected between signal line and chassis ground, clamping differential surges before they reach transceiver IC inputs. Use Value: Maintains <1.0 µA leakage at 150 V, avoiding false triggering in high-impedance bias networks while surviving 400 W IEC 61000-4-5 surges. |
| Power Supply Input Rails | Automotive Body Control Modules |
|
Use Scenario: Secondary-stage overvoltage protection on 13.5–16 V input rails of DC/DC converters powering infotainment head units. IC Role / Device Role / Timing Role: Standoff-rated clamp placed after primary fuse and upstream of input filter capacitors to absorb load-dump energy. Use Value: Withstands 40 A 8.3 ms forward surge (per Fig. 6), enabling robust protection against ISO 7637-2 Pulse 5a load-dump events without degradation. |
Use Scenario: CAN bus line protection in body control modules where 12 V supply transients coexist with ESD events on LIN/CAN pins. IC Role / Device Role / Timing Role: Unidirectional TVS on VCC rail feeding CAN transceivers, suppressing battery voltage spikes while preserving low-leakage operation. Use Value: RθJA = 120 °C/W allows direct mounting on small copper pads, simplifying layout in space-constrained BCM PCBs without thermal vias. |
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 | Lower clamping voltage (243 V vs. 268 V) due to tighter VBR tolerance (167–185 V vs. 167–204 V); same VWM, PPPM, and package. | Better suited for systems requiring tighter clamping margin below 250 V, e.g., 3.3 V microcontroller I/O protection with series impedance. | Select SMAJ150A-E3/5A when lower VC is prioritized over wider VBR tolerance; verify layout thermal relief matches 120 °C/W RθJA. |
| SMBJ150A-E3/52 | DO-214AA (SMB) package - larger footprint (0.260″ × 0.130″ vs. 0.208″ × 0.157″), higher PPPM (600 W), identical VWM/VC specs. | Preferred where higher surge energy absorption is required and board space permits larger package; not drop-in compatible. | Choose SMBJ150A-E3/52 only if 600 W rating is needed and PCB layout accommodates larger pad dimensions; no change to circuit function. |
Compared with SMAJ150-E3/5A, the SMAJ150A-E3/5A offers improved clamping precision at the cost of reduced VBR margin, while the SMBJ150A-E3/52 delivers higher surge capacity in a physically incompatible package - making SMAJ150-E3/5A the optimal balance of compact size, proven 400 W rating, and broad design adoption in space-constrained industrial and telecom systems.
Availability
SMAJ150-E3/5A is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interfaces, power supply input rails, and automotive body control modules requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ150-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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and automotive subsystems where robustness against lightning, ESD, and load-dump events is mission-critical.
FAQ
What is the maximum clamping voltage of SMAJ150-E3/5A under standard test conditions?
The SMAJ150-E3/5A has a maximum clamping voltage (VC) of 268 V when subjected to its rated peak pulse current of 1.1 A using a 10/1000 µs waveform. This value is measured at TA = 25 °C on specified copper pad layout and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ150-E3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ150-E3/5A suitable for automotive applications?
SMAJ150-E3/5A is rated for operation from –55 °C to +150 °C and meets RoHS, MSL Level 1, and JESD201 Class 1A whisker test requirements - making it suitable for under-hood and cabin automotive applications such as body control modules and power distribution units. However, it is not AEC-Q101 qualified; for certified automotive use, the HE3-suffix variant (e.g., SMAJ150AHE3/5A) should be selected instead of SMAJ150-E3/5A.
What does the "E3/5A" suffix indicate in SMAJ150-E3/5A?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD201 Class 1A whisker resistance. The "/5A" indicates packaging in 13″ diameter plastic tape and reel with a base quantity of 7500 units - distinct from "/61" (7″ reel, 1800 units). Both suffixes apply exclusively to the SMAJ150-E3/5A ordering variant.
How does SMAJ150-E3/5A differ from SMAJ150A-E3/5A?
SMAJ150-E3/5A has a breakdown voltage range of 167–204 V and clamps at 268 V, while SMAJ150A-E3/5A has a tighter VBR range of 167–185 V and clamps at 243 V. Both share identical VWM (150 V), PPPM (400 W), package (DO-214AC), and thermal specs. The "A" suffix indicates enhanced VBR uniformity - SMAJ150A-E3/5A is preferred where lower clamping voltage is critical, whereas SMAJ150-E3/5A offers broader tolerance for cost-sensitive designs.
Can SMAJ150-E3/5A be used in bi-directional protection circuits?
No - SMAJ150-E3/5A is a unidirectional TVS diode, intended for DC or polarity-defined AC applications where the cathode is connected to the protected line and anode to ground. For bi-directional surge protection (e.g., AC signal lines or floating buses), the CA-suffix variant SMAJ150CA-E3/5A must be used, as it provides symmetrical clamping in both polarities. Using SMAJ150-E3/5A in bi-directional configurations risks forward conduction and failure during negative transients.
SMAJ150-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 150V
- Voltage - Breakdown (Min):
- 167V
- Voltage - Clamping (Max) @ Ipp:
- 268V
- Current - Peak Pulse (10/1000µs):
- 1.1A
- 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)
SMAJ150-E3/5A FAQ
1.How can I place an order for SMAJ150-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150-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 SMAJ150-E3/5A reliable?
The price and inventory of SMAJ150-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 SMAJ150-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ150-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150-E3/5A?
SMAJ150-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150-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 SMAJ150-E3/5A?
For technical support, including SMAJ150-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150-E3/5A requirements.
6.How does Aetrix verify that SMAJ150-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ150-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 SMAJ150-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ150-E3/5A?
All SMAJ150-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150-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 SMAJ150-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ150-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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