My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ12AHM3_A/I
- Part No.:
- SMAJ12AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ12AHM3_A/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,820
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ12AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast-rising voltage transients on power and signal lines. It features a 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 19.9 V maximum clamping voltage (VC) at 20.1 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ12AHM3_A/I datasheet, SMAJ12AHM3_A/I pinout, SMAJ12AHM3_A/I application, or SMAJ12AHM3_A/I equivalent, this part delivers verified AEC-Q101 qualification, halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity - critical for high-reliability board-level ESD and surge protection design validation.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device across DC power rails or low-speed signal paths, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps), enabling effective suppression of EFT, lightning-induced surges, and inductive switching spikes.
The SMAJ12AHM3_A/I is rated for 150 °C max junction temperature, exhibits 0.083 %/°C VBR temperature coefficient, and maintains 3.3 W steady-state power dissipation on infinite heatsink - supporting continuous operation in thermally constrained automotive cabin and engine-control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V nominal systems. |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - guaranteed breakdown range ensures predictable turn-on without premature conduction. |
| VC @ IPPM | 19.9 V at 20.1 A - clamping voltage under 10/1000 μs surge defines worst-case overvoltage seen by protected ICs. |
| PPPM | 400 W - peak pulse power handling capacity with standard 10/1000 μs waveform; derates to 300 W above 78 V. |
| ID @ VWM | ≤1.0 μA - ultra-low reverse leakage preserves system standby current budget in battery-powered applications. |
| TJ max | +150 °C - enables deployment in under-hood automotive environments and industrial motor drive control boards. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal footprint per terminal. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices; meets UL 94 V-0 flammability rating and J-STD-020 MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side reference | Connected to ground or lower-potential rail; forms clamping path when cathode is at higher transient voltage. |
| Cathode | Reverse-biased input / protected line connection | Connected to power rail or signal line requiring protection; conducts during overvoltage events to shunt energy to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - suitable for ASIL-B subsystems. |
| Halogen-free & RoHS-compliant | HM3 suffix denotes halogen-free molding compound and lead finish - meets EU ELV and China RoHS requirements for green manufacturing. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 (4 kV surge) on 12 V lines with margin; validated with 0.2" × 0.2" copper pads per terminal. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage stress on downstream components - critical for protecting 16 V tolerant logic and analog front-ends. |
| Fast response time | Sub-nanosecond turn-on ensures suppression before sensitive circuitry experiences damaging overvoltage - confirmed via TLP testing. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied ECUs exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between VBAT and GND to limit transients to <20 V. Use Value: Prevents latch-up or gate oxide damage in microcontrollers and CAN transceivers during ISO 7637-2 Pulse 5a events. |
Use Scenario: Analog output lines from pressure/temperature sensors in PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance TVS on 4–20 mA loop or 0–10 V analog outputs. Use Value: Maintains signal integrity while suppressing ESD (IEC 61000-4-2 ±8 kV contact) without adding >10 pF loading. |
| Consumer Power Adapter Input Protection | MOSFET Gate Driver Protection |
|
Use Scenario: Secondary-side DC output of AC/DC adapters powering USB-C PD controllers. IC Role / Device Role / Timing Role: Standoff-rated TVS on +5 V / +9 V / +15 V rails upstream of LDOs. Use Value: Absorbs flyback spikes from disconnected loads and prevents brownout-induced reset in PMICs. |
Use Scenario: High-side N-channel MOSFET gate drive circuits in motor drivers. IC Role / Device Role / Timing Role: Clamping diode between gate and source to suppress Miller-induced voltage overshoot. Use Value: Limits VGS to <20 V, avoiding gate oxide breakdown while preserving fast switching performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12AHE3_A/I | Same electrical specs but RoHS-compliant (non-halogen-free) construction; no halogen-free certification. | Acceptable for commercial/industrial use where halogen-free requirement is not mandated. | Select SMAJ12AHE3_A/I if halogen-free compliance is not required and cost optimization is prioritized. |
| SMAJ12A-M3/61 | Identical electrical parameters; packaged in 7" tape-and-reel (1800 pcs) vs. 13" reel (7500 pcs); same HM3 halogen-free material. | Preferred for low-volume prototyping or small-batch production due to smaller reel size. | Choose SMAJ12A-M3/61 when matching existing assembly line tape feeders or minimizing initial inventory commitment. |
Compared with SMAJ12AHM3_A/I, SMAJ12AHE3_A/I lacks halogen-free documentation but matches all electrical and thermal ratings, while SMAJ12A-M3/61 offers identical performance in a smaller reel format - both serve as functionally aligned alternatives without PCB layout changes.
Availability
SMAJ12AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and consumer power adapter designs requiring stable component supply with AEC-Q101 qualification and halogen-free compliance.
Supply support for SMAJ12AHM3_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 robust transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where repeatable surge immunity and long-term parametric stability are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ12AHM3_A/I under a 10/1000 μs surge?
The SMAJ12AHM3_A/I has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current of 20.1 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 surge events - critical for ensuring compatibility with 20 V absolute maximum rated ICs.
Is the SMAJ12AHM3_A/I suitable for automotive applications?
Yes, the SMAJ12AHM3_A/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It supports operating junction temperatures up to +150 °C and is specified for load dump, ISO 7637-2, and ESD immunity in engine control units, body electronics, and ADAS sensor modules - making SMAJ12AHM3_A/I appropriate for under-hood and cabin applications.
What does the "HM3" suffix mean in SMAJ12AHM3_A/I?
The "HM3" suffix in SMAJ12AHM3_A/I indicates halogen-free, RoHS-compliant construction per JEDEC standards, including halogen-free molding compound and matte tin-plated leads. It also confirms compliance with JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 - distinguishing it from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS) variants. This makes SMAJ12AHM3_A/I suitable for green manufacturing programs requiring full halogen-free certification.
How does the SMAJ12AHM3_A/I compare to bidirectional TVS diodes like SMAJ12CA?
The SMAJ12AHM3_A/I is unidirectional and intended for DC line protection where polarity is fixed, offering lower leakage (<1.0 μA) and tighter VBR tolerance than bidirectional counterparts. In contrast, SMAJ12CA provides symmetrical clamping for AC or floating lines but exhibits higher ID (doubled per note 3 for ≤10 V VWM). For 12 V DC rails, SMAJ12AHM3_A/I delivers superior leakage control and is the preferred choice - unlike SMAJ12CA, which is unsuitable for polarized applications without external biasing.
What is the thermal resistance from junction to ambient for the SMAJ12AHM3_A/I?
The SMAJ12AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the minimum recommended pad layout (0.2" × 0.2" copper per terminal). This value assumes still air convection and defines the temperature rise above ambient per watt of steady-state power dissipation - essential for calculating safe operating area in thermally dense PCB layouts where SMAJ12AHM3_A/I may experience sustained leakage or repetitive surges.
SMAJ12AHM3_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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 20.1A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ12AHM3_A/I FAQ
1.How can I place an order for SMAJ12AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ12AHM3_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 SMAJ12AHM3_A/I reliable?
The price and inventory of SMAJ12AHM3_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 SMAJ12AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ12AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ12AHM3_A/I?
SMAJ12AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ12AHM3_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 SMAJ12AHM3_A/I?
For technical support, including SMAJ12AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ12AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ12AHM3_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 SMAJ12AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ12AHM3_A/I?
All SMAJ12AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12AHM3_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 SMAJ12AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ12AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ12AHM3_A/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
