My Inquiry
My Account
Taiwan Semiconductor Corporation SMAJ188CAH
- Part No.:
- SMAJ188CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188CAH.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,161
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ188CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power (10/1000μs), 188V working stand-off voltage (VWM), and clamping voltage of 328V at 0.9A peak impulse current - deployed for ISO 7637-2-compliant automotive power line protection in on-board DC/DC converters.
For engineers reviewing the SMAJ188CAH datasheet, SMAJ188CAH pinout, SMAJ188CAH application, or SMAJ188CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, moisture sensitivity level 1 compliance, and verified 150°C junction temperature rating under transient stress.
Technical Context
SMAJ188CAH is a glass-passivated, single-die, bidirectional TVS diode designed for unidirectional or bidirectional surge suppression in automotive and industrial power rails. It operates across -55°C to +150°C junction temperature range and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity requirements.
The device exhibits fast response time (<1.0ps from 0V to VBR min), low leakage (<1μA at VWM = 188V), and clamps transients up to 328V at 0.9A (10/1000μs waveform), with steady-state power dissipation limited to 1W and peak forward surge current rated at 40A (8.3ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 209 V / 231 V @ 1 mA - guaranteed breakdown threshold defining turn-on consistency |
| VC @ IPPM | 328 V @ 0.9 A - clamped voltage during 10/1000μs surge, limiting downstream IC stress |
| PPPM | 400 W - peak pulse power handling per 10/1000μs waveform, derated above 25°C ambient |
| IR @ VWM | <1 μA - minimal leakage ensures negligible standby power loss in high-impedance circuits |
| TJ max | +150 °C - enables reliable operation in under-hood automotive environments |
| Package | DO-214AC (SMA) - surface-mount footprint compatible with automated placement and J-STD-002 soldering |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case meeting UL 94V-0 flammability rating; matte tin-plated leads; cathode band marking for polarity identification; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient return path | Connects to ground or low-impedance reference plane to complete clamping loop |
| Cathode (banded end) | Transient input node | Connected to protected line (e.g., 12V/24V rail); absorbs positive/negative surges bidirectionally |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal/humidity stress |
| ISO 7637-2 compliance | Guarantees robustness against load dump, jump start, and inductive switching transients in vehicle ECUs |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or dry pack handling |
| Halogen-free construction | Meets IEC 61249-2-21 for environmentally compliant manufacturing and end-of-life processing |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Protects primary-side MOSFETs and controller ICs from reflected transients during MOSFET switching in 12V/24V automotive SMPS units. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across input rail and ground, responding within <1.0ps to limit voltage excursions. Use Value: Maintains VDS stress below 328V during 400W pulses, preventing avalanche-induced failure of power semiconductors. | Use Scenario: Shields buck converter ICs and gate drivers in ADAS domain controllers from battery line transients during cold cranking or load dump. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between VIN and GND, clamping both positive and negative spikes per ISO 7637-2 Pulse 1/2a/3b. Use Value: Enables uninterrupted operation down to -55°C and up to +150°C junction temperature while sustaining 0.9A impulse current. |
| Lighting Application | Automotive Adapter |
Use Scenario: Safeguards LED driver ICs in headlamp modules from alternator ripple and ignition noise coupled into 12V supply lines. IC Role / Device Role / Timing Role: Low-leakage (≤1μA) bidirectional suppressor placed at driver input, minimizing quiescent current impact. Use Value: Prevents false triggering or latch-up in analog current regulators by holding clamped voltage ≤328V during 10/1000μs events. | Use Scenario: Integrated into OBD-II or USB-C automotive adapters to meet OEM EMC requirements for conducted transients. IC Role / Device Role / Timing Role: Final-stage protection device mounted adjacent to input connector, absorbing coupling from external cables. Use Value: Delivers AEC-Q101 traceability and RoHS/halogen-free compliance required for Tier-1 adapter certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ188CA | Same DO-214AC package, identical VWM/VC specs, but not AEC-Q101 qualified | Lacks automotive qualification; suitable for industrial/commercial use only | Select when AEC-Q101 is not mandated and cost optimization is prioritized |
| ON Semiconductor SMAJ188CA | Identical electrical parameters and package; AEC-Q101 qualified per Rev. 2 datasheet | Same automotive use case support; minor differences in MSL rating (Level 1 vs Level 2) | Preferred for dual-source strategy where Taiwan Semiconductor supply continuity is constrained |
Compared with SMAJ188CAH, Littelfuse SMAJ188CA omits AEC-Q101 validation and requires additional qualification effort for automotive deployment, while ON Semiconductor's SMAJ188CA matches full qualification and MSL profile but may differ in traceability documentation and lot-level test reporting.
Availability
SMAJ188CAH is available at Aetrix Electronics and suitable for automotive power rail protection, on-board DC/DC converter hardening, and lighting system surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMAJ188CAH 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 distribution and AEC-Q101 process validation.
SMAJ188CAH belongs to TSC's AEC-Q101-qualified SMAJ series, engineered specifically for automotive-grade transient suppression in 12V/24V systems subject to ISO 7637-2 stress profiles.
FAQ
What is the clamping voltage of SMAJ188CAH under standard 10/1000μs surge conditions?
The SMAJ188CAH clamps to a maximum of 328 V when subjected to its rated peak impulse current of 0.9 A using the standardized 10/1000μs waveform. This value is measured per Figure 5 in the official datasheet and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMAJ188CAH qualified for automotive applications per AEC-Q101?
Yes, SMAJ188CAH is explicitly AEC-Q101 qualified as stated in the "FEATURES" section of the Taiwan Semiconductor datasheet. This qualification covers stress tests including HTGB, H3TRB, temperature cycling, and ESD, confirming suitability for under-hood and ECU-level deployment.
What does the "CAH" suffix indicate in SMAJ188CAH?
The "CAH" suffix denotes a bidirectional configuration (C), AEC-Q101 qualification (A), and halogen-free construction (H). This distinguishes SMAJ188CAH from unidirectional variants (e.g., SMAJ188AH) and non-automotive versions (e.g., SMAJ188CH).
Does SMAJ188CAH meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements?
Yes, SMAJ188CAH is specified to meet all five ISO 7637-2 transient test pulses - Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a/3b (capacitive coupling and supply line noise) - as confirmed in the "FEATURES" list.
What is the maximum junction temperature rating for SMAJ188CAH?
SMAJ188CAH has a maximum junction temperature (TJ) rating of +150°C, validated across its full operating range from -55°C to +150°C. This allows sustained operation in high-temperature automotive environments such as engine control units and body control modules.
SMAJ188CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 328V
- Current - Peak Pulse (10/1000µs):
- 900mA
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ188CAH FAQ
1.How can I place an order for SMAJ188CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188CAH 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 SMAJ188CAH reliable?
The price and inventory of SMAJ188CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ188CAH is usually 5 days.
3.What payment methods are accepted for SMAJ188CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188CAH?
SMAJ188CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188CAH 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 SMAJ188CAH?
For technical support, including SMAJ188CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188CAH requirements.
6.How does Aetrix verify that SMAJ188CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ188CAH 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 SMAJ188CAH meets industry standards.
7.What is the process for return or replacement of SMAJ188CAH?
All SMAJ188CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188CAH, 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 SMAJ188CAH part is unused and in its original packaging.
Return procedure for SMAJ188CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ188CAH 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…
