My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ51CAHM3_A/I
- Part No.:
- SMBJ51CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CAHM3_A/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,690
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ51CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V standoff voltage (VWM), 6.4–7.07 V minimum/maximum breakdown voltage at 1 mA test current, 600 W peak pulse power rating (10/1000 µs waveform), and clamps transients to ≤82.4 V at 7.3 A peak surge current - deployed on signal lines and power rails in industrial sensor interfaces and telecom infrastructure.
For engineers reviewing the SMBJ51CAHM3_A/I datasheet, SMBJ51CAHM3_A/I pinout, SMBJ51CAHM3_A/I application, or SMBJ51CAHM3_A/I equivalent, this device serves as a halogen-free, RoHS-compliant, AEC-Q101 qualified TVS for bidirectional transient suppression where low clamping voltage, fast response (<1 ns), and MSL Level 1 reflow compatibility are critical selection criteria.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the low incremental surge resistance enables effective energy diversion during ESD or lightning-induced surges.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its 10/1000 µs waveform capability supports repetitive surge events at 0.01% duty cycle, making it suitable for sustained protection in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 51 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin below breakdown. |
| VBR min/max @ IT = 1 mA | 56.7 V / 62.7 V - Confirmed breakdown range under standardized DC test; ensures predictable turn-on threshold. |
| VC @ IPPM = 7.3 A | ≤82.4 V - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected circuitry. |
| PPPM (Peak Pulse Power) | 600 W - Energy-handling capacity per IEC 61000-4-5 surge waveform; validates suitability for industrial-level transients. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at rated standoff voltage; critical for low-power sensor and battery-backed systems. |
| TJ max | +150 °C - Maximum junction temperature rating; supports operation in high-ambient industrial or automotive under-hood environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated SMT assembly and IPC-7351B land patterns. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical two-terminal construction with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal functions identically; no cathode band - enables flexible PCB layout without orientation constraints. |
| Terminal 2 | Anode/Cathode (bidirectional) | Second terminal completes symmetrical clamping path; supports differential or common-mode transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 600 W peak pulse power (10/1000 µs) | Handles high-energy transients from inductive switching or lightning surges in industrial control systems. |
| MSL Level 1, 260 °C peak reflow | Supports lead-free reflow soldering without preconditioning; eliminates moisture sensitivity handling overhead. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standards. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for EU, China RoHS, and JEITA EG0201 standards. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) in factory automation sensors exposed to motor drive noise and relay switching transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and return paths to clamp ±kV-level surges before they reach precision DACs or op-amps. Use Value: Maintains signal integrity by limiting transient overshoot to ≤82.4 V, preventing latch-up or damage to downstream 24 V-rated interface ICs. |
Use Scenario: Shielding Ethernet PHY data lines (e.g., RJ45 magnetics secondary side) against ESD and induced surges in enterprise switches and base stations. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at connector entry point to shunt fast-rising transients before propagation into PHY IC. Use Value: Achieves sub-nanosecond response with <1.0 µA leakage, preserving signal rise time and minimizing bit error rate in 100BASE-TX links. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
Use Scenario: Safeguarding LIN bus communication lines in door modules and lighting controllers subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: AEC-Q101 qualified bidirectional suppressor placed between LIN transceiver and harness connector. Use Value: Withstands repetitive 12 V system surges up to 600 W and operates reliably from −40 °C to +150 °C junction temperature. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in washing machines and HVAC blowers connected to microcontroller GPIOs. IC Role / Device Role / Timing Role: Clamp diode installed across motor terminals to absorb inductive kickback during PWM commutation. Use Value: Limits flyback voltage to ≤82.4 V, protecting 5 V logic-level MOSFET drivers and preventing MCU reset from voltage rail collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CAHE3_A/I | Same electrical specs and SMB package, but RoHS-compliant commercial grade (not AEC-Q101 qualified); uses standard tin plating instead of whisker-tested matte tin. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and full AEC-Q101 validation is unnecessary. |
| SMAJ51CAHM3_A/I | Lower 400 W PPPM rating, same 51 V VWM and bidirectional configuration; SMA (DO-214AC) package with smaller 4.5 mm × 2.7 mm footprint. | Reduced surge energy handling; appropriate for lower-risk consumer or portable applications with space constraints. | Choose when board space is limited and peak surge exposure is below 400 W - avoids overdesign while maintaining pin-compatible layout. |
Compared with SMBJ51CAHM3_A/I, SMBJ51CAHE3_A/I omits AEC-Q101 validation and whisker testing, while SMAJ51CAHM3_A/I trades 33% lower pulse power for 40% smaller PCB area - enabling trade-offs between automotive compliance, surge robustness, and miniaturization.
Availability
SMBJ51CAHM3_A/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and automotive body control modules requiring stable component supply with halogen-free, AEC-Q101 qualified assurance.
Supply support for SMBJ51CAHM3_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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was developed to deliver high-power transient suppression in compact surface-mount packages for automotive, industrial, and telecom systems demanding AEC-Q101 qualification and repeatable clamping performance.
FAQ
What does the "CA" suffix indicate in SMBJ51CAHM3_A/I?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ51CAHM3_A/I provides symmetrical clamping for both positive and negative transients without polarity dependence. Unlike unidirectional variants (e.g., SMBJ51A), it has no cathode marking and is used where AC signals, floating grounds, or differential lines require equal protection in both directions.
Is SMBJ51CAHM3_A/I suitable for automotive applications?
Yes - SMBJ51CAHM3_A/I carries the HM3 suffix, confirming it is halogen-free, RoHS-compliant, and AEC-Q101 qualified. It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD verification per AEC standards, making it approved for use in automotive body electronics, infotainment, and powertrain subsystems.
What is the clamping voltage of SMBJ51CAHM3_A/I under surge conditions?
SMBJ51CAHM3_A/I clamps to a maximum of 82.4 V at its rated peak pulse current of 7.3 A (10/1000 µs waveform). This value is measured per IEC 61000-4-5 and represents the upper limit of voltage seen by protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
How does the HM3 suffix differ from HE3 in Vishay's SMBJ series?
The HM3 suffix in SMBJ51CAHM3_A/I indicates halogen-free, RoHS-compliant, and AEC-Q101 qualified construction with matte tin whisker-tested leads. In contrast, HE3 denotes RoHS-compliant and AEC-Q101 qualified but not halogen-free - making HM3 the preferred choice for strict environmental compliance in automotive and green electronics programs.
Can SMBJ51CAHM3_A/I be used in place of a unidirectional TVS like SMBJ51A?
No - SMBJ51CAHM3_A/I is bidirectional and lacks polarity markings, whereas SMBJ51A is unidirectional with a cathode band. Substituting them requires verifying circuit topology: SMBJ51CAHM3_A/I works only where symmetrical clamping is needed (e.g., AC lines), while SMBJ51A is required for DC-biased rails where forward conduction must be blocked.
SMBJ51CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
SMBJ51CAHM3_A/I FAQ
1.How can I place an order for SMBJ51CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CAHM3_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 SMBJ51CAHM3_A/I reliable?
The price and inventory of SMBJ51CAHM3_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 SMBJ51CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ51CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CAHM3_A/I?
SMBJ51CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CAHM3_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 SMBJ51CAHM3_A/I?
For technical support, including SMBJ51CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ51CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ51CAHM3_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 SMBJ51CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ51CAHM3_A/I?
All SMBJ51CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CAHM3_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 SMBJ51CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ51CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CAHM3_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 …
