My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ120CAHE3_A/H
- Part No.:
- SMAJ120CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120CAHE3_A/H.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,535
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ120CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 120 V standoff voltage (VWM), 133–147 V breakdown voltage (VBR) at 1 mA, 193 V maximum clamping voltage (VC) at 1.6 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ120CAHE3_A/H datasheet, SMAJ120CAHE3_A/H pinout, SMAJ120CAHE3_A/H application, or SMAJ120CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C junction temperature rating, low incremental surge resistance, and compatibility with automated SMT assembly on standard PCB copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<1 μA leakage at 120 V), but switches to low-impedance conduction within picoseconds when transient voltage exceeds VBR, diverting surge current away from downstream circuitry. Its bidirectional symmetry ensures identical clamping behavior for positive and negative transients.
The SMAJ120CAHE3_A/H uses a glass-passivated silicon junction and is rated for 400 W peak pulse power (derated to 300 W above 78 V), with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 133 V / 147 V at 1 mA - Confirmed breakdown threshold range defining turn-on precision |
| VC @ IPPM | 193 V at 1.6 A - Clamped voltage during 10/1000 μs surge, limiting stress on protected ICs |
| PPPM | 400 W (10/1000 μs) - Peak transient energy absorption capacity on standard 5 mm × 5 mm copper pads |
| ID @ VWM | 1.0 μA - Ultra-low leakage ensuring minimal standby power loss and signal integrity |
| TJ max. | +150 °C - Enables operation in under-hood automotive and high-temperature industrial environments |
| Package | SMA (DO-214AC) - Standardized SMT footprint compatible with JEDEC MS-013AC, supports automated placement |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Case dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | One terminal of symmetrical PN junction; conducts during negative overvoltage events |
| Cathode | Transient current entry (positive half-cycle) | Other terminal of symmetrical PN junction; conducts during positive overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| 400 W peak pulse power (10/1000 μs) | Robust suppression of ISO 7637-2 pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges in 12 V/24 V systems |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during fast transients, reducing risk of latch-up in protected ICs |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow without moisture-induced damage or delamination |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term parameter stability under thermal and humidity stress |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply rails in engine control units (ECUs) and body control modules (BCMs) against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly across input rail, clamping spikes before they reach DC-DC converters and microcontrollers. Use Value: Withstands 400 W surges and maintains <1 μA leakage at 120 V, enabling reliable operation in harsh automotive environments per ISO 16750-2. |
Use Scenario: Safeguarding analog and digital signal lines (e.g., CAN, LIN, analog sensor outputs) in factory automation sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential-mode across signal pair or common-mode to ground, suppressing ±15 kV contact ESD per IEC 61000-4-2. Use Value: Symmetrical clamping (133–147 V VBR) and 193 V VC ensure balanced protection without signal distortion or DC offset shift. |
| Telecom Power Input Protection | Consumer Device USB/Power Port Protection |
|
Use Scenario: Guarding AC/DC adapter inputs and PoE-powered equipment front-ends against lightning-induced surges and AC line transients. IC Role / Device Role / Timing Role: Primary-stage TVS on secondary-side DC bus, absorbing repetitive 10/1000 μs surges up to 300 W above 78 V. Use Value: Derated 300 W capability at higher voltages enables sustained protection in telecom infrastructure with elevated DC bus levels. |
Use Scenario: Securing USB-C power delivery (PD) ports and auxiliary charging inputs in portable electronics against hot-plug transients and ESD. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp on VBUS line, placed upstream of USB PD controller and load switch. Use Value: 1.0 μA leakage at 120 V prevents battery drain; SMA package allows compact layout near connector with minimal trace inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120CA-M3 | Halogen-free, RoHS-compliant, same electrical specs and AEC-Q101 qualification; differs only in material composition (HM3 suffix variant not used) | No functional difference; suitable where halogen-free compliance is mandated by OEM or regional regulation | Select SMAJ120CA-M3 if halogen-free materials are required; otherwise SMAJ120CAHE3_A/H offers identical performance with standard RoHS compliance. |
| SMBJ120CAHE3_A/H | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; 600 W peak pulse power rating (vs. 400 W) | Higher power handling enables longer surge duration immunity; requires larger PCB area and different pad layout | Choose SMBJ120CAHE3_A/H only when >400 W surge margin is needed; SMAJ120CAHE3_A/H remains optimal for space-constrained automotive and portable designs. |
Compared with SMAJ120CA-M3, the SMAJ120CAHE3_A/H provides identical clamping performance and AEC-Q101 qualification but with standard RoHS compliance instead of halogen-free construction; versus SMBJ120CAHE3_A/H, it trades 200 W peak power headroom for 30% smaller footprint and lower thermal resistance in dense layouts.
Availability
SMAJ120CAHE3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and consumer USB-C power interfaces requiring stable component supply, AEC-Q101 assurance, and consistent TVS performance across production batches.
Supply support for SMAJ120CAHE3_A/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was developed for robust, surface-mount transient suppression in automotive, industrial, and communications systems-delivering precise clamping, high surge tolerance, and AEC-Q101 qualification in compact DO-214AC packaging.
FAQ
What is the clamping voltage of SMAJ120CAHE3_A/H at its rated peak pulse current?
The SMAJ120CAHE3_A/H has a maximum clamping voltage (VC) of 193 V at 1.6 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ120CAHE3_A/H maintains this clamping performance consistently across its qualified temperature range of –55 °C to +150 °C.
Is SMAJ120CAHE3_A/H suitable for automotive applications?
Yes, SMAJ120CAHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use per Vishay's ordering nomenclature (HE3 suffix). It meets requirements for temperature cycling, mechanical shock, and humidity testing, and is rated for operation from –55 °C to +150 °C. Its 120 V standoff and 193 V clamping make it appropriate for 24 V system protection in ECUs, ADAS modules, and body electronics.
What is the leakage current specification for SMAJ120CAHE3_A/H at its maximum working voltage?
At its maximum reverse standoff voltage (VWM) of 120 V and TA = 25 °C, the SMAJ120CAHE3_A/H exhibits a maximum reverse leakage current (ID) of 1.0 μA. This ultra-low leakage ensures minimal power loss in always-on circuits and preserves signal integrity in high-impedance sensor interfaces. Leakage remains well below 5 μA even at elevated temperatures up to 125 °C.
Does SMAJ120CAHE3_A/H have polarity markings on the package?
No, SMAJ120CAHE3_A/H is a bidirectional TVS diode and carries no polarity marking on the SMA (DO-214AC) case. Unlike unidirectional variants (e.g., SMAJ120A), which feature a cathode band, the CA version uses a symmetrical junction structure-both terminals behave identically under positive or negative overvoltage conditions. PCB layout must treat both pads as non-polarized.
What is the thermal resistance from junction to ambient for SMAJ120CAHE3_A/H?
The typical thermal resistance from junction to ambient (RθJA) for SMAJ120CAHE3_A/H is 120 °C/W when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes still air conditions and is critical for calculating junction temperature rise during repetitive surge events. For improved thermal performance, designers may enhance copper area or add thermal vias beneath the SMA pad.
SMAJ120CAHE3_A/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 1.6A
- 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)
SMAJ120CAHE3_A/H FAQ
1.How can I place an order for SMAJ120CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120CAHE3_A/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 SMAJ120CAHE3_A/H reliable?
The price and inventory of SMAJ120CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ120CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ120CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120CAHE3_A/H?
SMAJ120CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120CAHE3_A/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 SMAJ120CAHE3_A/H?
For technical support, including SMAJ120CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ120CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ120CAHE3_A/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 SMAJ120CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ120CAHE3_A/H?
All SMAJ120CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120CAHE3_A/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 SMAJ120CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ120CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ120CAHE3_A/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 …
