My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ120CAHM3_A/H
- Part No.:
- SMAJ120CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ120CAHM3_A/H.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,737
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ120CAHM3_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 stand-off 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) - suitable for protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ120CAHM3_A/H datasheet, SMAJ120CAHM3_A/H pinout, SMAJ120CAHM3_A/H application, or SMAJ120CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (via HM3 suffix), low thermal resistance (RθJL = 30 °C/W), and compatibility with automated SMT assembly on standard 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche junction structure, responding in <1 ps to transient overvoltages. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity-sensitive layout constraints.
Rated for repetitive surge duty cycle of 0.01 %, it delivers 400 W peak pulse power up to 78 V and 300 W above 78 V, with derating above TA = 25 °C per Fig. 2. Junction temperature range spans −55 °C to +150 °C, and it meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
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 IT = 1 mA - guaranteed avalanche breakdown window defining turn-on threshold |
| VC @ IPPM | 193 V at 1.6 A - clamped voltage during full-rated 10/1000 μs surge, limiting stress on downstream components |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - peak transient energy absorption capacity under standardized waveform |
| ID @ VWM | 1.0 μA - ultra-low leakage ensuring minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max | +150 °C - enables reliable operation in under-hood automotive and industrial ambient environments |
| RθJL | 30 °C/W - low junction-to-lead thermal resistance supports effective heat transfer to PCB copper pads |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified (HM3 suffix). Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); cathode band omitted (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Common terminal for symmetrical clamping; connects to protected line or ground reference depending on circuit topology |
| Cathode | Transient return path (bidirectional) | Electrically identical to Anode in CA devices; no polarity marking; used interchangeably in layout |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualification (HM3) | Validated reliability for automotive powertrain, body electronics, and ADAS subsystems per stress test requirements |
| 400 W peak pulse power (≤78 V) | Withstands IEC 61000-4-5 surge events up to 4 kV (line-to-earth) when properly mounted on 5 mm × 5 mm copper pads |
| MSL Level 1, 260 °C peak | Supports lead-free reflow without moisture-induced popcorning, eliminating pre-bake requirements |
| Glass passivated junction | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift in harsh environments |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-supplied ECUs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping element placed between power input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤193 V, preventing damage to downstream regulators rated for 200 V absolute max. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) shunt protector on 4–20 mA or 0–10 V output lines. Use Value: Sub-μA leakage preserves signal accuracy; fast response prevents latch-up in precision op-amps. |
| Telecom Line Interface Protection | Consumer Power Adapter Input Stage |
Use Scenario: Safeguarding PoE-powered Ethernet PHYs from induced surges on twisted-pair cables. IC Role / Device Role / Timing Role: Bidirectional clamp across differential pair (e.g., MDI-X lines) referenced to common-mode ground. Use Value: Symmetric clamping maintains signal integrity during ±1 kV contact ESD (IEC 61000-4-2) without polarity biasing. |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters after rectification and bulk capacitance. IC Role / Device Role / Timing Role: Standoff-rated TVS across DC bus to absorb switching spikes from flyback transformer leakage inductance. Use Value: 120 V VWM aligns with 170 VDC peak of 120 VAC input; 193 V VC avoids tripping downstream OVP circuits prematurely. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ120AHE3_A/H | Unidirectional variant; includes cathode band marking; VF = 3.5 V at 25 A forward conduction | Requires polarity-aware placement; suited for DC-biased rails where reverse conduction must be blocked | Select when circuit topology mandates unidirectional blocking (e.g., output of rectifier stage) |
| SMBJ120CAHM3_A/H | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package; 600 W PPPM rating; RθJL = 25 °C/W | Higher power handling and better thermal performance, but 25 % larger footprint (4.57 mm × 3.94 mm) | Choose when surge energy exceeds 400 W or board space allows larger package for improved margin |
Compared with SMAJ120AHE3_A/H, SMAJ120CAHM3_A/H eliminates polarity dependency and simplifies layout; versus SMBJ120CAHM3_A/H, it trades 200 W lower surge rating for 25 % smaller area - optimal for space-constrained automotive modules where 400 W meets ISO 16750-2 Class III requirements.
Availability
SMAJ120CAHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply with AEC-Q101 assurance and halogen-free compliance.
Supply support for SMAJ120CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade validation.
The SMAJ series targets cost-effective, high-volume transient protection for automotive, industrial, and consumer power systems - engineered for robustness under repetitive surge stress and extended temperature operation.
FAQ
What does the "CA" suffix indicate in SMAJ120CAHM3_A/H?
The "CA" suffix denotes a bidirectional configuration: SMAJ120CAHM3_A/H provides symmetrical clamping in both voltage polarities, with identical VBR, VC, and IPPM characteristics regardless of applied transient direction. This eliminates the need for polarity orientation during PCB placement and supports AC-coupled or floating signal line protection - unlike unidirectional variants such as SMAJ120AHE3_A/H which require cathode alignment.
Is SMAJ120CAHM3_A/H qualified for automotive use?
Yes, SMAJ120CAHM3_A/H carries the HM3 suffix, indicating halogen-free, RoHS-compliant construction and full AEC-Q101 qualification per Vishay's documentation. It has passed stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - making it suitable for under-hood and chassis-mounted automotive modules where reliability under thermal and mechanical stress is critical.
What is the maximum clamping voltage of SMAJ120CAHM3_A/H under surge conditions?
The maximum clamping voltage (VC) of SMAJ120CAHM3_A/H is 193 V, measured at its rated peak pulse current (IPPM) of 1.6 A under the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events - essential for verifying compatibility with downstream ICs' absolute maximum ratings.
How does the SMA (DO-214AC) package of SMAJ120CAHM3_A/H affect thermal performance?
The SMA (DO-214AC) package of SMAJ120CAHM3_A/H delivers a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W, enabling efficient heat transfer to PCB copper pads. When mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, it sustains its 400 W peak pulse rating up to 78 V and maintains safe junction temperatures during repetitive surges - critical for designs lacking dedicated heatsinking.
Can SMAJ120CAHM3_A/H replace SMAJ120AHE3_A/H in an existing design?
No direct replacement is assured: SMAJ120CAHM3_A/H is bidirectional while SMAJ120AHE3_A/H is unidirectional with cathode marking and forward voltage drop (VF = 3.5 V). Swapping requires verifying that reverse conduction during normal operation is acceptable and that layout accommodates missing polarity marking. If the original design relies on unidirectional blocking, SMAJ120CAHM3_A/H may allow unintended current paths - redesign validation is mandatory before substitution.
SMAJ120CAHM3_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:
- 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)
SMAJ120CAHM3_A/H FAQ
1.How can I place an order for SMAJ120CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ120CAHM3_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 SMAJ120CAHM3_A/H reliable?
The price and inventory of SMAJ120CAHM3_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 SMAJ120CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ120CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ120CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ120CAHM3_A/H?
SMAJ120CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ120CAHM3_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 SMAJ120CAHM3_A/H?
For technical support, including SMAJ120CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ120CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ120CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ120CAHM3_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 SMAJ120CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ120CAHM3_A/H?
All SMAJ120CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ120CAHM3_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 SMAJ120CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ120CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ120CAHM3_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 …
