My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ24CAHM3_A/I
- Part No.:
- SMCJ24CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ24CAHM3_A/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,099
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ24CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust ESD and surge protection on signal/power lines. It features a 24 V standoff voltage (VWM), 38.9 V clamping voltage (VC) at 38.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMCJ24CAHM3_A/I datasheet, SMCJ24CAHM3_A/I pinout, SMCJ24CAHM3_A/I application, or SMCJ24CAHM3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), thermal resistance (RθJA = 75 °C/W), and compatibility with 8.0 mm × 8.0 mm copper pad layouts per JEDEC standards.
Technical Context
This device operates as a voltage-clamped shunt protector: during transients exceeding its breakdown voltage (VBR min = 26.7 V, max = 29.5 V at 1 mA), it rapidly switches to low-impedance conduction, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ps).
Rated for -55 °C to +150 °C junction temperature, the SMCJ24CAHM3_A/I leverages low incremental surge resistance and meets MSL Level 1 (260 °C reflow peak). The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - critical for automotive-grade reliability in engine control units and ADAS sensor nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 24 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems |
| VBR (Breakdown Voltage) | 26.7–29.5 V at 1 mA - precise threshold where avalanche conduction initiates; ensures tight tolerance for predictable protection onset |
| VC (Clamping Voltage) | 38.9 V at IPPM = 38.6 A - peak voltage seen by protected circuit during 1500 W surge; enables safe margin for 3.3 V/5 V logic interfaces |
| PPPM (Peak Pulse Power) | 1500 W (10/1000 µs) - sustained energy-handling capability without degradation; supports IEC 61000-4-5 Level 4 surges |
| TJ max | +150 °C - maximum junction temperature rating; allows operation in under-hood automotive environments and industrial enclosures |
| RθJA | 75 °C/W - thermal resistance junction-to-ambient on standard 8.0 mm × 8.0 mm pads; informs heatsinking requirements for repeated surge duty |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint; optimized for automated placement and high-current PCB routing |
Pinout & Package
SMCJ24CAHM3_A/I uses the SMC (DO-214AB) package: a 2-terminal, bidirectional surface-mount device with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connects to ground or common reference plane; carries full IPPM during either polarity surge event |
| Cathode | Transient return path (bidirectional) | Electrically identical to Anode in CA devices; forms symmetrical clamping network across protected line |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain and chassis systems; supports PPAP documentation and long-term reliability under thermal cycling |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates for EU, China RoHS, and automotive OEM sustainability programs without compromising surge performance |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on protected ICs - critical for safeguarding CAN transceivers, RS-485 drivers, and microcontroller GPIOs |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with high-volume manufacturing using 260 °C peak profile |
| 1500 W peak pulse power | Withstands multiple IEC 61000-4-5 4 kV/2 Ω surges without parameter shift or failure - suitable for front-end port protection |
Applications
| Automotive Sensor Protection | Industrial Ethernet Port |
|---|---|
Use Scenario: Protecting LIN/CAN bus nodes and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between signal line and chassis ground; responds within picoseconds to suppress transients up to 1500 W. Use Value: Maintains signal integrity below 38.9 V clamping level during 38.6 A surge, preventing latch-up or damage to 5 V tolerant transceivers and ADC inputs. |
Use Scenario: Safeguarding RJ45 PHY interface pins on industrial switches and PLC Ethernet ports against EFT and lightning-induced surges. IC Role / Device Role / Timing Role: Line-to-ground TVS on differential pairs (e.g., TX+/TX−); symmetric clamping preserves common-mode rejection and data eye integrity. Use Value: Enables compliance with IEC 61000-4-4 (4 kV EFT) and IEC 61000-4-5 (2 kV surge) without adding series impedance or signal distortion. |
| Telecom DSL Line Interface | Power Supply Input Stage |
Use Scenario: Front-end protection of ADSL/VDSL line drivers and SLIC circuits exposed to tip-ring surges and AC power cross-talk. IC Role / Device Role / Timing Role: Bidirectional TVS across line pair (TIP-RING); clamps both positive and negative transients equally due to CA symmetry. Use Value: Withstands repetitive 10/1000 µs surges up to 1500 W while maintaining <1.0 µA leakage at 24 V - preserving low-noise analog performance. |
Use Scenario: Secondary-side overvoltage suppression on 24 V DC input rails feeding motor drivers, solenoid controllers, and embedded power modules. IC Role / Device Role / Timing Role: Shunt protector between rail and ground; activated only during fault conditions (e.g., back-EMF, hot-swap inrush). Use Value: Limits transient overshoot to ≤38.9 V during 38.6 A events, protecting downstream PMICs, gate drivers, and optocouplers from overvoltage stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CAHE3_A/I | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Restricted to lower-energy surges; unsuitable for IEC 61000-4-5 Level 4 or automotive load dump | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD only |
| SMCJ24AHE3_A/I | Unidirectional variant; cathode band marking; same VWM/VC/PPPM but asymmetric conduction | Requires correct polarity placement; not usable on AC-coupled or floating differential lines | Choose only for DC-biased single-ended lines where reverse conduction must be blocked |
Compared with SMCJ24CAHM3_A/I, SMAJ24CAHE3_A/I trades surge capacity for compactness, while SMCJ24AHE3_A/I sacrifices bidirectionality for unidirectional blocking - making SMCJ24CAHM3_A/I the sole choice for AEC-Q101-compliant, halogen-free, high-power bidirectional protection in space-tolerant designs.
Availability
SMCJ24CAHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial communication interfaces, and telecom infrastructure requiring stable component supply with AEC-Q101 validation and halogen-free compliance.
Supply support for SMCJ24CAHM3_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 SMCJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where consistent clamping performance and long-term stability under thermal stress are mandatory.
FAQ
What does the "CA" suffix indicate in SMCJ24CAHM3_A/I?
The "CA" suffix denotes a bidirectional configuration: SMCJ24CAHM3_A/I provides symmetrical clamping for both positive and negative transients across its terminals, unlike unidirectional "A" variants that conduct only in reverse bias. This makes SMCJ24CAHM3_A/I ideal for AC-coupled lines, differential buses like CAN or RS-485, and floating sensor outputs where polarity reversal may occur during surge events.
Is SMCJ24CAHM3_A/I qualified for automotive use?
Yes, SMCJ24CAHM3_A/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix and Vishay's ordering documentation. It undergoes stress testing for temperature cycling, humidity, mechanical shock, and surge endurance required for automotive powertrain, body electronics, and ADAS applications - supporting PPAP submission and long-term field reliability in vehicles.
How does the HM3 suffix differ from M3 or HE3 in SMCJ24CAHM3_A/I?
The HM3 suffix in SMCJ24CAHM3_A/I specifies halogen-free, RoHS-compliant construction *and* AEC-Q101 qualification - whereas M3 indicates halogen-free/RoHS without automotive qualification, and HE3 indicates RoHS-compliant + AEC-Q101 but not halogen-free. This dual certification makes SMCJ24CAHM3_A/I compliant with both environmental and automotive reliability mandates simultaneously.
What is the maximum clamping voltage of SMCJ24CAHM3_A/I under surge conditions?
The maximum clamping voltage (VC) of SMCJ24CAHM3_A/I is 38.9 V at a peak pulse current (IPPM) of 38.6 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and represents the highest voltage imposed on protected circuitry during worst-case surge events - enabling design margin verification for 3.3 V, 5 V, and 24 V system components.
Can SMCJ24CAHM3_A/I be used in place of SMCJ24AHE3_A/I?
No - SMCJ24CAHM3_A/I is bidirectional while SMCJ24AHE3_A/I is unidirectional, meaning they are not functionally interchangeable without circuit redesign. Replacing SMCJ24AHE3_A/I with SMCJ24CAHM3_A/I on a DC-biased line introduces unintended conduction paths; conversely, using the unidirectional part in a bidirectional application leaves one polarity unprotected. Always match device polarity to system architecture.
SMCJ24CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 38.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ24CAHM3_A/I FAQ
1.How can I place an order for SMCJ24CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ24CAHM3_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 SMCJ24CAHM3_A/I reliable?
The price and inventory of SMCJ24CAHM3_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 SMCJ24CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ24CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ24CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ24CAHM3_A/I?
SMCJ24CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ24CAHM3_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 SMCJ24CAHM3_A/I?
For technical support, including SMCJ24CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ24CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ24CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ24CAHM3_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 SMCJ24CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ24CAHM3_A/I?
All SMCJ24CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ24CAHM3_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 SMCJ24CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ24CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ24CAHM3_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 …
