My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMA5J12CAHM3/H
- Part No.:
- SMA5J12CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J12CAHM3/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,164
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMA5J12CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on signal and power lines. It features a 12 V stand-off voltage (VWM), 19.9 V maximum clamping voltage (VC) at 25.1 A peak pulse current (IPPM), 500 W peak pulse power (10/1000 μs), and operates across -55 °C to +150 °C junction temperature. It is used to protect automotive sensor interfaces and industrial I/O lines against ESD and load dump transients.
For engineers reviewing the SMA5J12CAHM3/H datasheet, SMA5J12CAHM3/H pinout, SMA5J12CAHM3/H application, or SMA5J12CAHM3/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance data, clamping behavior under surge, and real-world design implications for PCB layout and reliability validation.
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to achieve fast response (<1 ns) and low incremental surge resistance, enabling effective suppression of ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and lightning-induced surges (IEC 61000-4-5). Its symmetrical breakdown characteristic (VBR min/max = 13.3 V / 14.7 V at 1 mA) ensures consistent clamping in both polarities without polarity marking.
The device is rated for 500 W peak pulse power with a 10/1000 μs waveform, derated above 25 °C per Fig. 2, and exhibits RθJA = 80 °C/W and RθJL = 25 °C/W - critical for thermal management in compact automotive and industrial modules where copper pad area is limited to 5.0 mm × 5.0 mm per terminal.
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 rail protection. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Ensures reliable turn-on above system nominal voltage while avoiding false triggering during normal operation. |
| VC @ IPPM | 19.9 V at 25.1 A - Clamping voltage limits downstream IC stress during 500 W surge; enables robust protection of 20 V-tolerant receivers. |
| PPPM | 500 W (10/1000 μs) - Supports high-energy transients common in automotive load-dump and industrial motor switching environments. |
| TJ range | -55 °C to +150 °C - Qualified for under-hood automotive and industrial control cabinet applications without derating. |
| Package | SMA (DO-214AC) - Surface-mount, low-profile package compatible with automated placement and reflow (MSL Level 1, 260 °C peak). |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTGB, H3TRB, and TCT. |
Pinout & Package
Two-terminal bidirectional device in SMA (DO-214AC) package; no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, with MSL Level 1 rating (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; bidirectional clamping occurs regardless of voltage polarity applied across the device. |
| Case (body) | Thermal and mechanical interface | Plastic body provides UL 94 V-0 flammability rating; thermal path relies on copper pad area (0.2" × 0.2") per terminal per spec. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns or external circuitry. |
| 500 W peak pulse power | Withstands high-energy transients from inductive switching in automotive power distribution and industrial PLC backplanes. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive use - eliminates need for additional qualification testing in Tier-1 module designs. |
| Low RθJL = 25 °C/W | Supports efficient heat transfer to PCB copper, reducing thermal runaway risk during repetitive surge events. |
| Glass-passivated junction | Improves long-term reliability and stability of breakdown voltage under humidity and temperature cycling stress. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor inputs (e.g., pressure, temperature) in engine control units and ADAS modules from ISO 7637-2 pulses and ESD. IC Role / Device Role: Primary overvoltage clamp placed directly at connector entry point before signal conditioning circuitry. Use Value: Limits transient voltage to ≤19.9 V, ensuring survival of 20 V-rated op-amps and microcontroller GPIOs during load dump events. |
Use Scenario: Safeguarding programmable logic controller (PLC) digital input channels exposed to 24 V DC field wiring with inductive load switching noise. IC Role / Device Role: Standoff-clamp TVS placed between input terminal and ground to shunt surge energy away from optocoupler input stage. Use Value: Maintains 12 V standoff while clamping to 19.9 V, preserving signal integrity and preventing false triggering during 500 W transients. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Protecting Ethernet PHY or RS-485 transceivers in base station equipment from lightning-induced surges on outdoor cabling. IC Role / Device Role: Secondary-level TVS deployed after gas discharge tube (GDT) primary protection to handle residual fast-rising energy. Use Value: Sub-20 V clamping voltage prevents damage to 3.3 V or 5 V transceiver ICs when paired with appropriate series impedance. |
Use Scenario: Adding surge immunity to 12 V output rails of wall-mounted AC/DC adapters used in smart home hubs and set-top boxes. IC Role / Device Role: Final-stage protector located immediately before USB-PD or PMIC input to absorb coupling noise from shared PCB traces. Use Value: Halogen-free (HM3) construction meets RoHS and IEC 61249-2-21 compliance for consumer end-product certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ12CA | Same 12 V VWM, but lower PPPM = 400 W; VC = 20.1 V at 20.1 A; not AEC-Q101 qualified. | Approved for commercial/industrial use only; unsuitable for automotive under-hood deployment without additional validation. | Select when cost sensitivity outweighs automotive qualification requirement and surge energy is limited to ≤400 W. |
| ON Semiconductor SMCJ12CA | Higher PPPM = 1500 W; larger SMC (DO-214AB) package; VC = 19.9 V at 75.3 A; AEC-Q101 qualified (HE3 suffix). | Requires more PCB area and higher mounting torque; better suited for main power rail protection than signal line level. | Choose for higher-energy threats where board space permits and thermal mass supports SMC footprint. |
Compared with SMA5J12CAHM3/H, SMAJ12CA offers lower cost but lacks automotive qualification and surge margin, while SMCJ12CA delivers triple the power rating at the expense of footprint and assembly compatibility - making SMA5J12CAHM3/H optimal for space-constrained, AEC-Q101–mandated signal-line protection.
Availability
SMA5J12CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom line interfaces, and consumer power adapter designs requiring stable component supply with halogen-free, AEC-Q101–qualified TVS protection.
Supply support for SMA5J12CAHM3/H 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 density, and automotive-grade qualification.
The SMA5J family is engineered specifically for high-power-density transient suppression in space-constrained automotive and industrial systems, balancing clamping performance, thermal efficiency, and manufacturability in surface-mount packages.
FAQ
What does the 'HM3' suffix indicate in SMA5J12CAHM3/H?
The 'HM3' suffix in SMA5J12CAHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with JESD201 Class 2 whisker resistance, MSL Level 1 reflow capability (260 °C peak), and automotive-grade reliability testing - essential for under-hood and safety-critical applications. SMA5J12CAHM3/H meets all requirements specified in the Vishay document 88875 revision 09-Jan-2024.
Is SMA5J12CAHM3/H unidirectional or bidirectional?
SMA5J12CAHM3/H is a bidirectional transient voltage suppressor, as indicated by the 'CA' suffix. Its symmetrical breakdown and clamping behavior apply equally in both directions, with no polarity marking on the SMA (DO-214AC) package. This makes SMA5J12CAHM3/H ideal for protecting AC-coupled signals, differential buses, or floating nodes where voltage polarity reversal is possible.
What is the maximum clamping voltage of SMA5J12CAHM3/H and at what current?
The maximum clamping voltage of SMA5J12CAHM3/H is 19.9 V, measured at the peak pulse current (IPPM) of 25.1 A under a 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet 88875 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events - critical for ensuring compatibility with 20 V-tolerant ICs in automotive and industrial designs using SMA5J12CAHM3/H.
Does SMA5J12CAHM3/H require a heatsink for standard operation?
No, SMA5J12CAHM3/H does not require an external heatsink under typical single-pulse or low-duty-cycle surge conditions. Its thermal resistance (RθJA = 80 °C/W) is specified for mounting on 0.2" × 0.2" copper pads per terminal, which provides sufficient heat dissipation. However, for repetitive surge scenarios or elevated ambient temperatures, PCB copper area optimization - not a discrete heatsink - is the recommended thermal enhancement method for SMA5J12CAHM3/H.
How does SMA5J12CAHM3/H compare to SMAJ12CA in terms of surge handling?
SMA5J12CAHM3/H handles 500 W peak pulse power (10/1000 μs), whereas SMAJ12CA is rated for 400 W under identical conditions. SMA5J12CAHM3/H also achieves lower clamping voltage (19.9 V vs. 20.1 V) at its respective IPPM, and is AEC-Q101 qualified - unlike SMAJ12CA. These differences make SMA5J12CAHM3/H more suitable for demanding automotive and industrial surge environments where higher energy absorption and qualification rigor are required.
SMA5J12CAHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 25.1A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J12CAHM3/H FAQ
1.How can I place an order for SMA5J12CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J12CAHM3/H 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 SMA5J12CAHM3/H reliable?
The price and inventory of SMA5J12CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J12CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMA5J12CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J12CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J12CAHM3/H?
SMA5J12CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J12CAHM3/H 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 SMA5J12CAHM3/H?
For technical support, including SMA5J12CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J12CAHM3/H requirements.
6.How does Aetrix verify that SMA5J12CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMA5J12CAHM3/H 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 SMA5J12CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMA5J12CAHM3/H?
All SMA5J12CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J12CAHM3/H, 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 SMA5J12CAHM3/H part is unused and in its original packaging.
Return procedure for SMA5J12CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J12CAHM3/H 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 …
