My Inquiry
My Account
Taiwan Semiconductor Corporation SMCJ30AH
- Part No.:
- SMCJ30AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30AH.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,052
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ30AH from Taiwan Semiconductor is a unidirectional 30V stand-off, 33.3–36.8V breakdown, 1500W peak pulse power transient voltage suppressor (TVS) in DO-214AB (SMC) package, designed for automotive-grade ESD and surge protection in power supply rails and I/O lines of industrial control systems.
For engineers reviewing the SMCJ30AH datasheet, SMCJ30AH pinout, SMCJ30AH application, or SMCJ30AH equivalent, key selection criteria include clamping voltage (48.4V @ 32A), AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and unidirectional polarity with cathode band marking.
Technical Context
The SMCJ30AH employs a glass-passivated silicon junction to achieve fast transient response (<1.0 ps rise time from 0 V to VBR(min)) and low leakage (<1 µA at 30 V). Its thermal design supports 150°C maximum junction temperature with RθJA = 55°C/W and RθJC = 10°C/W.
It operates as a unidirectional clamp: reverse-biased during overvoltage events, conducting surge current away from protected circuitry while maintaining <48.4V clamping across its terminals at 32A peak impulse. Forward voltage is 3.5V at 100A per specification note.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR(min) / VBR(max) | 33.3 V / 36.8 V - Breakdown initiates within this range at 1 mA test current, defining turn-on threshold tolerance |
| VC@IPPM | 48.4 V - Clamped voltage under 32 A 10/1000 µs surge, limiting downstream stress |
| PPK | 1500 W - Peak pulse power handling capability per single 1 ms transient per Fig.5 |
| IPPM | 32 A - Maximum non-repetitive peak surge current the device safely clamps |
| TJ(max) | 150 °C - Maximum junction temperature enabling operation in under-hood or industrial ambient environments |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance determines PCB copper area requirements for sustained power dissipation |
Pinout & Package
DO-214AB (SMC) surface-mount package: molded epoxy case rated UL 94V-0, matte tin-plated leads, cathode indicated by band marking, polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased terminal during clamping | Connected to protected line (e.g., 30V rail); conducts surge current to ground when transient exceeds VWM |
| Anode | Reference/ground return path | Must be connected to low-impedance system ground to complete clamping path and ensure VC performance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control units and body modules requiring reliability under thermal cycling and vibration |
| ISO 7637-2 compliant (Pulse 1/2a/2b/3a/3b) | Meets OEM-level automotive transient immunity standards for load dump, inductive switching, and battery disconnect events |
| Glass passivated junction | Ensures stable VBR tolerance and long-term leakage stability vs. metallurgical junctions in humid or high-bias conditions |
| Fast response time <1.0 ps | Clamps electrostatic discharge (ESD) before sensitive ICs experience latch-up or gate oxide damage |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly without floor-life constraints |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24V/30V supply inputs in automotive body control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and chassis ground, clamping surges within 1.0 ps to limit voltage to ≤48.4V. Use Value: Enables compliance with ISO 7637-2 Pulse 5a (load dump) without external series impedance or additional filtering components. | Use Scenario: Safeguarding analog input channels (e.g., 4–20 mA sensors) in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on signal line to ground, activated only during >30V transients while remaining invisible to normal 0–10V or 4–20mA operation. Use Value: Prevents sensor interface IC damage from induced lightning surges up to 1500W without affecting measurement accuracy or offset. |
| Telecom DC Power Feeds | Motor Drive Control Signal Lines |
Use Scenario: Securing -48V DC power inputs in telecom base station equipment against accidental AC coupling or lightning-induced common-mode spikes. IC Role / Device Role / Timing Role: Reverse-connected SMCJ30AH referenced to system ground, clamping positive-going transients on negative rail with 48.4V ceiling. Use Value: Maintains uninterrupted operation during 10/1000 µs surges up to 32A while meeting GR-1089-CORE immunity requirements. | Use Scenario: Shielding PWM enable/disable signals between microcontroller and gate driver ICs in BLDC motor inverters. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on isolated control traces, suppressing fast-edge noise from power stage switching. Use Value: Eliminates false triggering of gate drivers caused by dV/dt coupling, verified by <1 µA leakage at 30V ensuring no signal loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A | 600W rating, SMA package (smaller footprint, higher RθJA = 85°C/W), same VWM/VBR range | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump | Select when board space is constrained and surge energy does not exceed 600W |
| SMCJ30A | Same DO-214AB package and 1500W rating, but non-AEC-Q101 qualified and lacks ISO 7637-2 validation | Acceptable for industrial/commercial use where automotive qualification is not required | Choose for cost-sensitive non-automotive designs needing identical electrical specs and thermal performance |
Compared with SMAJ30A and SMCJ30A, the SMCJ30AH provides guaranteed AEC-Q101 reliability and full ISO 7637-2 immunity coverage-critical for automotive ECUs-while maintaining identical clamping behavior (48.4V @ 32A) and package compatibility with existing SMC layouts.
Availability
SMCJ30AH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, telecom power systems, and motor drive control requiring stable component supply with AEC-Q101 assurance and ISO 7637-2 compliance.
Supply support for SMCJ30AH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMCJ30AH belongs to TSC's AEC-Q101-qualified SMCJ(A)H TVS family, engineered specifically for robust transient immunity in harsh automotive and industrial environments where reliability under repeated surge stress is mandatory.
FAQ
What is the clamping voltage of the SMCJ30AH and how is it measured?
The SMCJ30AH has a maximum clamping voltage (VC) of 48.4 V, measured at a peak pulse current (IPPM) of 32 A using the 10/1000 µs double-exponential waveform defined in Fig.5 of the datasheet. This value ensures protected circuits remain below critical voltage thresholds during standardized surge events such as ISO 7637-2 Pulse 1 and Pulse 2b. The SMCJ30AH achieves this clamping performance consistently across its specified operating temperature range.
Is the SMCJ30AH suitable for bidirectional transient protection?
No, the SMCJ30AH is a unidirectional TVS diode intended for reverse-biased operation only. For bidirectional protection, Taiwan Semiconductor specifies part numbers with "CH" or "CAH" suffixes (e.g., SMCJ30CH). Using the SMCJ30AH in bidirectional configurations risks failure during positive transients on the anode, as it lacks symmetrical breakdown characteristics. Always verify polarity alignment in schematic and layout for the SMCJ30AH.
Does the SMCJ30AH require derating at elevated ambient temperatures?
Yes, the SMCJ30AH must be derated above 25°C ambient per the Pulse Derating Curve (Fig.2). At 85°C ambient, its 1500W peak pulse power rating reduces to approximately 900W due to thermal limitations. Designers must consult Fig.2 to determine allowable IPPM or PPK for target operating temperatures. The SMCJ30AH's RθJA = 55°C/W and TJ(max) = 150°C define its thermal boundary conditions.
What packaging and reel quantity is offered for the SMCJ30AH?
The SMCJ30AH is supplied in DO-214AB (SMC) package on tape-and-reel format with 3,000 units per reel, optimized for automated SMT placement. The device features matte tin-plated leads compliant with J-STD-002 solderability requirements and moisture sensitivity level 1 (MSL-1), eliminating bake requirements prior to reflow. Marking code "GFK" appears on the cathode-banded surface per the official marking diagram.
How does the SMCJ30AH differ from the SMCJ30H variant?
The SMCJ30AH offers tighter breakdown voltage tolerance (33.3–36.8 V) versus SMCJ30H (33.3–40.7 V), resulting in more predictable clamping onset and reduced risk of premature conduction. Both share identical VWM (30 V), PPK (1500 W), and package (DO-214AB), but only the SMCJ30AH is explicitly AEC-Q101 qualified and validated to ISO 7637-2 Pulse 1/2a/2b/3a/3b. The SMCJ30AH is the preferred choice for automotive applications demanding tighter parametric control and certification.
SMCJ30AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 32A
- 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)
SMCJ30AH FAQ
1.How can I place an order for SMCJ30AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30AH 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 SMCJ30AH reliable?
The price and inventory of SMCJ30AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30AH is usually 5 days.
3.What payment methods are accepted for SMCJ30AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30AH?
SMCJ30AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30AH 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 SMCJ30AH?
For technical support, including SMCJ30AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30AH requirements.
6.How does Aetrix verify that SMCJ30AH is sourced from the original manufacturer or authorized distributors?
All SMCJ30AH 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 SMCJ30AH meets industry standards.
7.What is the process for return or replacement of SMCJ30AH?
All SMCJ30AH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30AH, 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 SMCJ30AH part is unused and in its original packaging.
Return procedure for SMCJ30AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30AH 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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
