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Vishay General Semiconductor - Diodes Division SMAJ150AHE3_A/I
- Part No.:
- SMAJ150AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150AHE3_A/I.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,270
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Product details
Overview
SMAJ150AHE3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of DC power rails 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, and 400 W peak pulse power rating with 10/1000 μs waveform - suitable for automotive power supply input protection and industrial sensor interface surge hardening.
For engineers reviewing the SMAJ150AHE3_A/I datasheet, SMAJ150AHE3_A/I pinout, SMAJ150AHE3_A/I application, or SMAJ150AHE3_A/I equivalent, key selection considerations include its AEC-Q101 qualification, unidirectional polarity with cathode band marking, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads per JEDEC standard layout.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 150 V), then rapidly avalanches below 185 V to clamp transients within nanoseconds. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability across -55 °C to +150 °C operating range.
The device delivers 400 W peak pulse power up to 78 V and 300 W above 78 V (per derating curve), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling effective energy dissipation without external heatsinking in typical PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 12 V–48 V systems with transient headroom. |
| VBR (min/max) | 167 V / 185 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during ESD or load-dump events. |
| VC @ IPPM | 243 V at 1.2 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to sub-250 V level. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy absorption capability; supports ISO 7637-2 Pulse 5a load-dump compliance in automotive designs. |
| IFSM | 40 A - 8.3 ms half-sine surge current rating; withstands repetitive motor-switching surges without degradation. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount outline with 0.208" × 0.157" footprint; compatible with IPC-7351B standard land pattern and reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 compliant, RoHS-compliant and AEC-Q101 qualified (HE3 suffix). Polarity marked by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; forms current path during reverse-biased clamping event. |
| Cathode | High-side protected node | Connected to line being protected (e.g., 150 V rail); avalanche conduction occurs when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| 400 W peak pulse power | Handles ISO 16750-2 and ISO 7637-2 Pulse 1/2/5a transients without failure; eliminates need for cascaded protection stages. |
| Fast response time (<1 ns) | Clamps before sensitive downstream ICs (e.g., microcontrollers, CAN transceivers) experience overvoltage damage. |
| Low incremental surge resistance | Minimizes VC overshoot during high-di/dt events - critical for protecting MOSFET gates and precision analog front-ends. |
| MSL Level 1, 260 °C peak | Compatible with standard lead-free reflow processes without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 12 V/24 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground to clamp transients before they reach PMIC or MCU input. Use Value: Limits clamped voltage to 243 V while absorbing 400 W pulses - prevents brownout, latch-up, or permanent damage to 36 V-rated input stages. |
Use Scenario: 4–20 mA current loop or RS-485 bus in factory automation systems subject to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional-capable but used unidirectionally on supply-referenced signal lines to suppress common-mode transients. Use Value: Sub-1 ns response ensures clamping occurs before transient propagates through isolation barriers or damages ADC inputs. |
| Telecom DC Power Feeds | Consumer Device USB/DC Jack Protection |
|
Use Scenario: Central office power distribution feeding remote DSLAMs or fiber nodes with long cable runs susceptible to induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on +48 V DC feed line upstream of DC-DC converters and PoE controllers. Use Value: 150 V VWM provides 30 % margin above nominal 48 V, while 243 V VC protects downstream silicon rated for ≤250 V absolute maximum. |
Use Scenario: External DC adapter input on smart home hubs or set-top boxes where users may connect incorrect adapters. IC Role / Device Role / Timing Role: First-line defense against overvoltage faults (e.g., 19 V adapter on 12 V system) and ESD from user handling. Use Value: Withstands 40 A 8.3 ms surge and maintains <1 μA leakage at 150 V - avoids standby current drain while ensuring fail-safe shutdown. |
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-E3/61 | Same electrical specs and SMA package; commercial-grade (non-AEC-Q101), RoHS-compliant only. | Lacks automotive qualification; not approved for under-hood or safety-critical modules. | Select when cost-sensitive industrial or consumer designs do not require automotive reliability validation. |
| SMBJ150AHE3_A/I | Same VWM/VBR/VC, but SMB (DO-214AA) package - 27 % larger footprint, 50 % higher PPPM (600 W). | Better thermal performance and higher surge margin; requires revised PCB layout. | Choose when system-level surge testing exceeds 400 W or board space allows larger package for enhanced margin. |
Compared with SMAJ150AHE3_A/I, the SMAJ150A-E3/61 offers identical protection performance without AEC-Q101 validation, while SMBJ150AHE3_A/I provides higher surge capacity in a physically larger package - both require explicit evaluation against mechanical constraints and qualification requirements of the target application.
Availability
SMAJ150AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom power feeds, and consumer DC input protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMAJ150AHE3_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 optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, fast response, and qualification compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ150AHE3_A/I at its rated peak pulse current?
The SMAJ150AHE3_A/I has a maximum clamping voltage (VC) of 243 V at 1.2 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping performance is guaranteed across the full operating temperature range (-55 °C to +150 °C) and is integral to meeting ISO 7637-2 automotive transient immunity requirements.
Is SMAJ150AHE3_A/I suitable for bidirectional signal line protection?
No - SMAJ150AHE3_A/I is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection (e.g., AC lines or differential buses), the "CA" variant SMAJ150CAHE3_A/I must be used. Using SMAJ150AHE3_A/I on bidirectional signals risks forward conduction and unintended current paths, potentially damaging the device or circuit. Always match device polarity to signal topology.
Does SMAJ150AHE3_A/I meet automotive qualification standards?
Yes - SMAJ150AHE3_A/I carries the HE3 suffix, denoting RoHS-compliance and full AEC-Q101 qualification per Vishay's documentation. This includes stress testing for temperature cycling, high-temperature reverse bias (HTRB), and ESD (HBM ≥8 kV, CDM ≥1 kV). It is approved for use in automotive powertrain, chassis, and body electronics where reliability under extended temperature and vibration is mandatory.
What is the thermal resistance of SMAJ150AHE3_A/I, and how does it affect PCB layout?
SMAJ150AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. These values assume mounting on 0.2" × 0.2" copper pads per JEDEC standard. To maintain safe junction temperatures during repetitive surges, designers must provide adequate copper area and avoid thermal bottlenecks in traces - insufficient copper increases RθJA, risking thermal runaway during sustained transient activity.
How does the 150 V stand-off voltage (VWM) of SMAJ150AHE3_A/I relate to system voltage selection?
The 150 V VWM of SMAJ150AHE3_A/I is selected to provide ≥20 % margin above nominal DC rail voltages such as 120 VAC-derived supplies or 48 V/60 V industrial systems. It ensures minimal leakage (<1 μA) during steady-state operation while allowing sufficient headroom for ripple and tolerance before avalanche onset. Choosing a VWM too close to system voltage risks premature conduction; too high reduces clamping effectiveness - 150 V balances margin and protection integrity for mid-voltage applications.
SMAJ150AHE3_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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ150AHE3_A/I FAQ
1.How can I place an order for SMAJ150AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150AHE3_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 SMAJ150AHE3_A/I reliable?
The price and inventory of SMAJ150AHE3_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 SMAJ150AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ150AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150AHE3_A/I?
SMAJ150AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150AHE3_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 SMAJ150AHE3_A/I?
For technical support, including SMAJ150AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ150AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ150AHE3_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 SMAJ150AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ150AHE3_A/I?
All SMAJ150AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150AHE3_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 SMAJ150AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ150AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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