My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ40C
- Part No.:
- SMBJ40C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40C.pdf
- Description:
- 600W, 49.4V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,972
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ40C from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power lines and signal interfaces. It features a 40 V working stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC) at 9.7 A peak impulse current (IPP), and 600 W peak pulse power rating with DO-214AA (SMB) package. It is used in automotive infotainment power rails to suppress ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ40C datasheet, SMBJ40C pinout, SMBJ40C application, or SMBJ40C equivalent, key selection criteria include bidirectional clamping capability, 600 W 10/1000 µs surge rating, compliance with ISO 7637-2, junction temperature range (–55 °C to +150 °C), and DO-214AA mechanical compatibility with automated SMT placement.
Technical Context
The SMBJ40C is a silicon avalanche diode configured as a bidirectional TVS, operating symmetrically in both polarities without polarity dependence. Its breakdown voltage (VBR) is specified at 47.8 V (min) to 58.4 V (max) with 1 mA test current, and it achieves clamping within 1.0 ps response time - critical for protecting fast-edge digital interfaces against EFT and ESD events.
Thermally, it exhibits 10 °C/W junction-to-case (RθJC) and 55 °C/W junction-to-ambient (RθJA) resistance, enabling reliable operation under sustained transient stress when mounted on standard 1 oz copper PCBs. Its unidirectional forward voltage (VF = 3.5 V @ 50 A) applies only to unidirectional variants; SMBJ40C has no forward conduction path due to symmetrical bipolar structure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous DC or RMS voltage the device blocks without significant leakage |
| VBR (min/max) | 47.8 V / 58.4 V @ 1 mA - Ensures reliable turn-on before downstream IC damage thresholds |
| VC @ IPP | 64.5 V @ 9.7 A - Clamped voltage during 10/1000 µs surge; defines protected circuit's maximum overvoltage exposure |
| PPK | 600 W - Peak non-repetitive surge power handling per IEC 61000-4-5 and ISO 7637-2 |
| ID @ VWM | ≤1 µA - Low leakage preserves battery life and avoids false triggering in low-power systems |
| TJ Range | –55 °C to +150 °C - Supports under-hood automotive and industrial environments |
| Package | DO-214AA (SMB) - Standardized surface-mount footprint compatible with IPC-7351B land patterns |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not functional in bidirectional SMBJ40C); weight ≈ 0.090 g; UL 94V-0 rated compound; JESD201 Class 2 whisker resistant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | No functional polarity - either terminal serves as input/output; clamps positive or negative transients equally |
| Case (exposed pad) | Non-electrical thermal path | Not electrically connected; provides mechanical mounting and thermal dissipation via PCB copper area |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables suppression of sub-nanosecond ESD events before IC latch-up or gate oxide rupture |
| ISO 7637-2 compliance | Pulse 1/2a/2b/3a/3b validated - Meets automotive OEM requirements for load dump and inductive switching immunity |
| Moisture sensitivity level | MSL Level 1 (per J-STD-020) - No bake required prior to reflow; supports standard SMT assembly |
| Halogen-free construction | Complies with IEC 61249-2-21 - Meets RoHS and environmental compliance mandates for green electronics |
| Glass passivated junction | Enhanced reliability and stable VBR over temperature and lifetime - Reduces parameter drift in harsh environments |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus power supply in vehicle door modules from battery load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between VCC and GND, absorbing energy from ISO 7637-2 Pulse 2b (inductive switch-off) and Pulse 5a (load dump). Use Value: Limits rail voltage to ≤64.5 V during 9.7 A surges, preventing damage to 5 V LDOs and microcontrollers rated for 40 V absolute max. | Use Scenario: Safeguarding 4–20 mA current loop transmitters in factory automation against EFT bursts and lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across loop terminals, conducting only during transients >40 V while remaining invisible to normal 24 VDC operation. Use Value: Sub-µA leakage at 40 V ensures minimal impact on loop accuracy; 600 W rating handles multiple 10/1000 µs surges without degradation. |
| USB Port ESD Protection | LED Driver Input Stage Protection |
Use Scenario: Shielding USB 2.0 data lines and VBUS in embedded medical devices from ±15 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Bidirectional TVS placed on VBUS line upstream of USB controller, clamping both positive and negative ESD strikes. Use Value: 1.0 ps response ensures clamping occurs before ESD pulse edge reaches IC; 64.5 V VC prevents overshoot beyond USB 2.0 VBUS tolerance (5.25 V). | Use Scenario: Securing constant-current LED driver inputs in streetlight controllers exposed to outdoor lightning surges. IC Role / Device Role / Timing Role: Primary surge shunt on 48 V DC input rail, diverting energy away from buck controller IC and MOSFET gate drivers. Use Value: 600 W rating sustains repeated 10/1000 µs surges up to 9.7 A; DO-214AA package allows compact layout near connector entry point. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CA (Taiwan Semiconductor) | Identical electrical specs and DO-214AA package; "CA" suffix denotes same bidirectional configuration as "C" | No functional difference - marking code variant only; same clamping, leakage, and thermal performance | Select SMBJ40C unless procurement system requires CA suffix for traceability or internal BOM alignment |
| SMAJ40C (ON Semiconductor) | Same VWM (40 V), VC (64.5 V), PPK (400 W), but lower peak power rating (400 W vs. 600 W); DO-214AC (SMA) package (smaller footprint, higher RθJA) | Lower surge margin - suitable for lighter-duty consumer applications, not recommended for automotive ISO 7637-2 Pulse 5a | Choose SMAJ40C only if space-constrained and surge threat level is limited to IEC 61000-4-5 Level 3 (1 kV/2 kV) |
Compared with SMBJ40C, SMBJ40CA offers identical protection performance with alternate marking, while SMAJ40C trades 33% lower peak power and inferior thermal resistance for smaller size - making SMBJ40C the preferred choice for automotive and industrial 600 W surge requirements.
Availability
SMBJ40C is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor transmitters, and LED lighting controllers requiring stable component supply with full ISO 7637-2 compliance and extended temperature operation.
Supply support for SMBJ40C 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs since 1979.
The SMBJ series was developed specifically for high-reliability automotive and industrial transient suppression, emphasizing robust 600 W surge handling, MSL Level 1 assembly compatibility, and strict adherence to ISO 7637-2 and IEC 61000-4-5 standards.
FAQ
What is the clamping voltage of SMBJ40C at its rated peak impulse current?
The SMBJ40C has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak impulse current (IPP) of 9.7 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during surge events. The SMBJ40C maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C), ensuring consistent protection in demanding environments.
Is SMBJ40C unidirectional or bidirectional, and how does that affect circuit placement?
SMBJ40C is a bidirectional TVS diode, meaning it clamps voltage transients of either polarity symmetrically - no anode/cathode orientation is required during PCB placement. Unlike unidirectional variants (e.g., SMBJ40A), SMBJ40C has no functional polarity mark; the cathode band shown in the DO-214AA outline is non-functional. This simplifies layout in AC-coupled or floating systems such as LIN bus power rails or differential signal lines where polarity reversal may occur.
Does SMBJ40C meet automotive surge immunity standards like ISO 7637-2?
Yes, SMBJ40C is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms - covering common automotive transient threats including inductive switch-off, supply disconnection, and capacitive coupling. Its 600 W peak pulse power rating and 64.5 V clamping voltage ensure compliance with OEM-level requirements for 12 V and 24 V systems. Taiwan Semiconductor validates these ratings per the standard's test conditions, making SMBJ40C suitable for front-end protection in body control modules and ADAS power supplies.
What is the maximum leakage current of SMBJ40C at its working stand-off voltage?
At its working stand-off voltage (VWM) of 40 V, the SMBJ40C exhibits a maximum blocking leakage current (ID) of 1 µA at 25 °C - well below typical thresholds for battery-powered or low-power sensor nodes. This ultra-low leakage remains stable across temperature and ensures minimal impact on system quiescent current, especially critical in always-on automotive modules. The specification is verified per JEDEC test methods and applies to both polarities due to the device's bidirectional symmetry.
Can SMBJ40C be used in place of SMBJ40A in a design?
No - SMBJ40C and SMBJ40A are functionally distinct: SMBJ40C is bidirectional (clamps ± transients), while SMBJ40A is unidirectional (clamps only positive surges, conducts forward current). Replacing SMBJ40A with SMBJ40C introduces unnecessary conduction paths in DC-biased circuits and may compromise protection integrity. Always verify polarity requirements: use SMBJ40C for AC, floating, or dual-polarity rails; SMBJ40A only for single-polarity DC lines with defined ground reference. The SMBJ40C datasheet confirms no forward voltage (VF) spec - confirming absence of unidirectional conduction.
SMBJ40C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ40C FAQ
1.How can I place an order for SMBJ40C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40C 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 SMBJ40C reliable?
The price and inventory of SMBJ40C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40C is usually 5 days.
3.What payment methods are accepted for SMBJ40C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40C?
SMBJ40C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40C 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 SMBJ40C?
For technical support, including SMBJ40C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40C requirements.
6.How does Aetrix verify that SMBJ40C is sourced from the original manufacturer or authorized distributors?
All SMBJ40C 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 SMBJ40C meets industry standards.
7.What is the process for return or replacement of SMBJ40C?
All SMBJ40C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40C, 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 SMBJ40C part is unused and in its original packaging.
Return procedure for SMBJ40C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40C 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…
