My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ20CAH
- Part No.:
- SMBJ20CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CAH.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,359
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ20CAH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade ESD and surge protection in DC power rails and signal lines. It features a 20 V working stand-off voltage (VWM), 32.4 V maximum clamping voltage (VC) at 19.4 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time - deployed in lighting control modules and automotive body electronics.
For engineers reviewing the SMBJ20CAH datasheet, SMBJ20CAH pinout, SMBJ20CAH application, or SMBJ20CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and DO-214AA (SMB) package thermal performance (RθJA = 55 °C/W).
Technical Context
The SMBJ20CAH operates as a bipolar junction TVS diode with symmetrical breakdown characteristics in both forward and reverse directions, enabling robust protection against voltage transients of either polarity without polarity-sensitive placement. Its glass-passivated junction ensures stable leakage (<1 µA at 20 V) and long-term reliability under repeated surge stress.
Designed for automotive environments, it meets AEC-Q101 stress testing and ISO 7637-2 immunity requirements for load dump and inductive switching events. Thermal design is supported by RθJC = 10 °C/W and RθJA = 55 °C/W, allowing effective heat dissipation in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR (min/max) | 22.2 V / 24.5 V @ 1 mA - Ensures reliable turn-on above system operating voltage with margin |
| VC @ IPP | 32.4 V @ 19.4 A - Clamps transient energy to safe levels for downstream 24 V-rated ICs |
| PPK | 600 W - Sustains high-energy 10/1000 µs surges common in automotive load-dump events |
| ID @ VWM | <1 µA - Negligible standby leakage, critical for low-power always-on circuits |
| TJ max | +150 °C - Supports operation in under-hood automotive environments |
| Response time | <1.0 ps - Faster than most ESD events, enabling sub-nanosecond clamping |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking indicating polarity; bidirectional configuration means both terminals are functionally symmetric - no anode/cathode assignment required in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked side) | Transient current entry point (either polarity) | Accepts surge current during positive or negative transients; bidirectional symmetry eliminates orientation dependency |
| Cathode (unmarked side) | Transient current exit point (either polarity) | Completes low-impedance path to ground/rail during clamping; identical electrical behavior to anode terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use across temperature, humidity, and mechanical shock stress profiles |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (switching noise) |
| Glass passivated junction | Enhances moisture resistance and long-term stability of breakdown voltage over life cycle |
| Moisture sensitivity level 1 | Zero bake requirement before reflow; compatible with standard SMT assembly processes |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally constrained applications |
Applications
| Automotive Lighting Control | Infotainment Power Rail Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers in headlamp and tail lamp modules from load-dump and inductive kickback. IC Role / Device Role: Bidirectional clamping element placed across 12 V/24 V supply rail and ground. Use Value: Limits transient voltage to ≤32.4 V, preventing latch-up or gate oxide damage in 36 V-tolerant drivers. |
Use Scenario: Safeguarding USB-C PD controllers and display power supplies in dashboard infotainment units from ESD and battery transients. IC Role / Device Role: Low-capacitance TVS on 5 V/12 V input rails upstream of DC-DC converters. Use Value: Sub-1 µA leakage preserves sleep-mode current budget; fast response prevents data corruption during hot-plug events. |
| Body Control Module (BCM) CAN Interface | Industrial Sensor Signal Conditioning |
Use Scenario: Protecting CAN transceiver I/O pins against ESD and coupled transients in vehicle body networks. IC Role / Device Role: Bidirectional TVS between CAN_H/CAN_L differential pair and chassis ground. Use Value: Symmetrical clamping maintains differential integrity while limiting common-mode overvoltage to <35 V. |
Use Scenario: Shielding analog front-end amplifiers and ADC inputs in factory automation sensors exposed to relay switching noise. IC Role / Device Role: Rail-to-rail TVS on ±15 V op-amp supply lines and sensor output traces. Use Value: 20 V VWM aligns with industrial ±15 V systems; 600 W rating handles repetitive 10/1000 µs surges per IEC 61000-4-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ20CA | Same DO-214AC (SMA) package; slightly higher VC = 34.0 V @ 17.6 A; RθJA = 65 °C/W | Lower power density due to larger thermal resistance; less suitable for high-density automotive PCBs | Preferred where legacy SMA footprint exists and thermal margin >10 °C is available |
| ON Semiconductor SMCJ20CA | DO-214AB (SMC) package; 600 W rating; VC = 32.5 V @ 19.4 A; RθJA = 40 °C/W | Higher thermal efficiency but 30% larger board area; requires layout revision | Chosen when higher sustained surge duty cycle or extended ambient temperature range (>125 °C) is required |
Compared with SMBJ20CAH, SMAJ20CA offers footprint compatibility with older designs but sacrifices thermal performance, while SMCJ20CA improves thermal handling at the cost of board space - SMBJ20CAH delivers optimal balance of AEC-Q101 compliance, SMB footprint, and 55 °C/W thermal resistance for new automotive ECUs.
Availability
SMBJ20CAH is available at Aetrix Electronics and suitable for automotive lighting control, infotainment power rail protection, and body control module (BCM) CAN interface applications requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMBJ20CAH 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, and rectifiers with global automotive and industrial certifications.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in automotive subsystems, emphasizing low clamping voltage, fast response, and robust thermal performance in the DO-214AA package.
FAQ
What is the breakdown voltage range of SMBJ20CAH?
The SMBJ20CAH has a minimum breakdown voltage (VBR) of 22.2 V and a maximum of 24.5 V at 1 mA test current, ensuring consistent clamping onset above its 20 V working stand-off voltage while accommodating process variation - critical for reliable protection in 24 V automotive systems where SMBJ20CAH is commonly deployed.
Is SMBJ20CAH unidirectional or bidirectional?
SMBJ20CAH is a bidirectional TVS diode, indicated by the "CAH" suffix and confirmed by symmetrical electrical specifications in both polarities - its VBR, VC, and IPP values apply identically for positive and negative transients, eliminating polarity concerns during PCB placement and simplifying design for differential or AC-coupled lines.
Does SMBJ20CAH meet automotive qualification standards?
Yes, SMBJ20CAH is AEC-Q101 qualified and explicitly tested to ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b standards, making it suitable for under-hood and cabin applications including lighting modules, BCMs, and infotainment power supplies where SMBJ20CAH provides certified transient immunity without derating.
What is the maximum clamping voltage of SMBJ20CAH at rated surge current?
The SMBJ20CAH clamps to a maximum of 32.4 V at its rated peak pulse current of 19.4 A (10/1000 µs waveform), providing a safe margin below the absolute maximum ratings of common 36 V-tolerant automotive ICs - this precise VC value is measured and guaranteed per Taiwan Semiconductor's datasheet for SMBJ20CAH.
What package type does SMBJ20CAH use, and is it RoHS compliant?
SMBJ20CAH uses the DO-214AA (SMB) surface-mount package with matte tin-plated leads and is fully RoHS compliant and halogen-free per IEC 61249-2-21 - its MSL Level 1 rating allows direct placement into reflow ovens without pre-baking, streamlining manufacturing for SMBJ20CAH in high-volume automotive production.
SMBJ20CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 19.4A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ20CAH FAQ
1.How can I place an order for SMBJ20CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CAH 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 SMBJ20CAH reliable?
The price and inventory of SMBJ20CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20CAH is usually 5 days.
3.What payment methods are accepted for SMBJ20CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CAH?
SMBJ20CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CAH 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 SMBJ20CAH?
For technical support, including SMBJ20CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CAH requirements.
6.How does Aetrix verify that SMBJ20CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ20CAH 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 SMBJ20CAH meets industry standards.
7.What is the process for return or replacement of SMBJ20CAH?
All SMBJ20CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CAH, 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 SMBJ20CAH part is unused and in its original packaging.
Return procedure for SMBJ20CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CAH 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…
