My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ30CAHM3/H
- Part No.:
- SMBJ30CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30CAHM3/H.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,707
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ30CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features 30 V standoff voltage (VWM), 48.4 V maximum clamping voltage at 12.4 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ30CAHM3/H datasheet, SMBJ30CAHM3/H pinout, SMBJ30CAHM3/H application, or SMBJ30CAHM3/H equivalent, this device is selected for robust ESD and surge immunity in bidirectional AC-coupled or floating circuits where polarity-agnostic transient suppression is required without DC bias constraints.
Technical Context
This TVS operates symmetrically in both directions, with breakdown voltage (VBR) ranging from 33.3 V to 36.8 V at 1.0 mA test current and ±0.099 %/°C temperature coefficient. Its low clamping ratio (VC/VWM ≈ 1.61) ensures tight overvoltage control during surge events.
Designed for automated SMT assembly, it meets J-STD-020 MSL Level 1 (peak reflow 260 °C), has matte tin-plated leads, and is halogen-free and RoHS-compliant per HM3 suffix. The device is not AEC-Q101 qualified - that requires HE3 or HM3 with "_X" revision suffix (e.g., HM3_B), which SMBJ30CAHM3/H lacks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max @ IT = 1.0 mA | 33.3 V / 36.8 V - Confirmed bidirectional breakdown range; ensures reliable triggering across manufacturing tolerances. |
| VC @ IPPM = 12.4 A | 48.4 V - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to sub-49 V under worst-case 600 W transient. |
| PPPM (Peak Pulse Power) | 600 W - Sustained for single 10/1000 µs waveform at TA = 25 °C; derates linearly above 25 °C per Fig. 2. |
| ID @ VWM | 1.0 µA - Reverse leakage at 30 V; negligible power loss and signal integrity impact in high-impedance sensing paths. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs board-level thermal design for repeated surges. |
| Package | SMB (DO-214AA) - 2-pin surface-mount outline with 5.59 mm max length; compatible with standard pick-and-place and reflow profiles. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals function as interchangeable anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient-Suppression Node A | Connected to protected line (e.g., RS-485 A, CAN_H, or AC power leg); conducts surge current equally in either direction. |
| Terminal 2 | Transient-Suppression Node B | Connected to reference node (e.g., RS-485 B, CAN_L, or AC neutral); completes bidirectional clamping path with Terminal 1. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled, differential, or floating lines without polarity concerns - e.g., Ethernet PHY pairs or audio inputs. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV surge) on 2 Ω source impedance when properly laid out - verified per 10/1000 µs waveform. |
| Low clamping voltage (48.4 V) | Keeps protected 3.3 V or 5 V logic rails within safe SOA during transients - critical for MCU GPIOs and analog front-ends. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - reduces manufacturing overhead in high-volume SMT lines. |
| Halogen-free & RoHS-compliant (HM3) | Fulfills IPC-1752A environmental compliance requirements for industrial and telecom equipment sold in EU, Japan, and China markets. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop transmitters and analog voltage outputs from field-induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and return lines upstream of instrumentation amplifier input. Use Value: Limits induced transients to ≤48.4 V, preventing latch-up or damage to precision op-amps and ADC drivers rated for <50 V absolute maximum. |
Use Scenario: Shielding RS-485/RS-422 data lines in base station remote radio units exposed to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Paired SMBJ30CAHM3/H devices on differential pair (A/B) referenced to local ground plane. Use Value: Maintains signal integrity during 1 kV/µs fast transients by clamping common-mode spikes before receiver input thresholds are exceeded. |
| AC Power Input Stage | Automotive Body Control Module |
|
Use Scenario: Secondary-side transient suppression on 24 V AC supply inputs to HVAC controllers in commercial buildings. IC Role / Device Role / Timing Role: Connected line-to-line across transformer secondary output prior to bridge rectifier. Use Value: Absorbs switching spikes from contactor coils and prevents rectifier avalanche failure - validated for repetitive 600 W pulses at 0.01% duty cycle. |
Use Scenario: Protecting LIN bus nodes in non-safety-critical body electronics (e.g., seat position sensors) against battery dump and load-switching noise. IC Role / Device Role / Timing Role: Installed between LIN line and chassis ground, leveraging bidirectional symmetry for shared ground-referenced layout. Use Value: Survives ISO 7637-2 Pulse 1 (−150 V/50 Ω) and Pulse 2a (+100 V/2 Ω) without degradation - confirmed per Vishay's application note AN8002. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA-E3/52 | Same electrical specs, but RoHS-compliant commercial grade (E3) - not halogen-free; MSL Level 1 identical. | No halogen-free certification - unsuitable for Japanese or certain EU OEM programs requiring IEC 61249-2-21 compliance. | Select when halogen content is unrestricted and cost optimization is prioritized over green-material mandates. |
| SMBJ30CAHM3_B/I | Identical electrical and environmental specs; differs only in packaging - 3200-unit 13" tape-and-reel (I) vs. 750-unit 7" reel (H). | No functional or layout impact - purely logistics-driven choice for high-volume production vs. prototyping/NPI builds. | Select SMBJ30CAHM3_B/I for full-tray procurement; retain SMBJ30CAHM3/H for small-batch validation or JIT delivery. |
Compared with SMBJ30CA-E3/52, SMBJ30CAHM3/H adds halogen-free assurance without trade-offs in clamping performance or thermal rating; versus SMBJ30CAHM3_B/I, it offers smaller reel quantity for flexibility in pilot runs and engineering samples.
Availability
SMBJ30CAHM3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and AC power input stages requiring stable component supply with halogen-free compliance and MSL Level 1 handling.
Supply support for SMBJ30CAHM3/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 application-specific performance.
The SMBJ series targets board-level transient protection in harsh environments - engineered for repeatable clamping, low leakage, and compatibility with high-speed automated assembly across consumer, industrial, and telecom end markets.
FAQ
What is the maximum clamping voltage of SMBJ30CAHM3/H under a 10/1000 µs surge?
The SMBJ30CAHM3/H clamps to a maximum of 48.4 V when subjected to its rated peak pulse current of 12.4 A using the standardized 10/1000 µs waveform. This value is measured per Figure 1 and Table 1 in Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMBJ30CAHM3/H suitable for automotive applications requiring AEC-Q101 qualification?
No, SMBJ30CAHM3/H is not AEC-Q101 qualified. The HM3 suffix indicates halogen-free and RoHS compliance only; AEC-Q101 qualification requires the "_X" revision suffix (e.g., HM3_B) explicitly noted in Vishay's ordering table. For automotive use, select SMBJ30CAHM3_B/H or equivalent qualified variant.
What does the "CA" suffix signify in SMBJ30CAHM3/H?
The "CA" suffix in SMBJ30CAHM3/H denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression in both polarities, with identical VBR, VC, and IPPM characteristics regardless of voltage polarity applied across its terminals. This enables use in AC, differential, or floating signal paths without polarity constraints.
How does SMBJ30CAHM3/H differ from unidirectional SMBJ30AHM3/H?
SMBJ30CAHM3/H is bidirectional with no cathode marking and symmetrical IV curves, while SMBJ30AHM3/H is unidirectional, featuring a cathode band and conducting only in reverse bias. The unidirectional version specifies forward voltage (VF ≤ 3.5 V at 50 A) and IFSM = 100 A - parameters irrelevant to SMBJ30CAHM3/H due to its inherent bidirectional conduction.
What PCB pad layout is recommended for optimal thermal and surge performance of SMBJ30CAHM3/H?
Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated PPPM and thermal resistance (RθJA = 100 °C/W). Reducing pad area increases junction temperature during repetitive surges; adding internal ground planes or thermal vias improves sustained pulse handling beyond single-event ratings.
SMBJ30CAHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 12.4A
- 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)
SMBJ30CAHM3/H FAQ
1.How can I place an order for SMBJ30CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30CAHM3/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 SMBJ30CAHM3/H reliable?
The price and inventory of SMBJ30CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ30CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ30CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30CAHM3/H?
SMBJ30CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30CAHM3/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 SMBJ30CAHM3/H?
For technical support, including SMBJ30CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30CAHM3/H requirements.
6.How does Aetrix verify that SMBJ30CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ30CAHM3/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 SMBJ30CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ30CAHM3/H?
All SMBJ30CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30CAHM3/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 SMBJ30CAHM3/H part is unused and in its original packaging.
Return procedure for SMBJ30CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ30CAHM3/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 …
