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STMicroelectronics LDP01-82AY
- Part No.:
- LDP01-82AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
LDP01-82AY.pdf
- Description:
- TVS DIODE 70VWM 113VC D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:7,215
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Product details
Overview
LDP01-82AY from STMicroelectronics is an AEC-Q101-qualified automotive Transil™ TVS diode designed for load-dump protection in 12 V/24 V vehicle electrical systems. It features a 70–86 V breakdown voltage (VBR at IR = 1 mA), 113 V clamping voltage at 35 A (10/1000 µs), 1 µA leakage at 25 °C, and operates up to 175 °C junction temperature. It is used in alternator output line protection of engine control units and body control modules.
For engineers reviewing the LDP01-82AY datasheet, LDP01-82AY pinout, LDP01-82AY application, or LDP01-82AY equivalent, key selection criteria include ISO 7637-2 Pulse 5a/5b and ISO 16750-2 Test A/B compliance, D²PAK thermal performance (Rth(j-c) = 0.24 °C/W), and clamping behavior under 771 W peak pulse power at Tj = 25 °C.
Technical Context
The LDP01-82AY employs planar silicon avalanche technology optimized for high-energy transient suppression in automotive power rails. Its unidirectional configuration provides reverse-biased surge clamping with low dynamic impedance (89 mΩ) and precise voltage temperature coefficient (αT = 10.5 × 10−4/°C), enabling stable clamping across −55 °C to +175 °C.
It meets stringent automotive immunity standards: ISO 7637-2 Pulse 5a (−150 V), Pulse 5b (+112 V), and ISO 16750-2 Tests A (up to +90 V) and B (up to +80 V), while sustaining 30 kV ESD per IEC 61000-4-2 and ISO 10605 with 330 pF/330 Ω network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 77.8–86 V at 1 mA - defines minimum surge initiation threshold before clamping |
| Clamping Voltage (VCL) | 113 V at 35 A (10/1000 µs) - maximum voltage seen by protected circuit during worst-case load dump |
| Peak Pulse Power | 771 W at Tj = 25 °C - supports sustained energy absorption without thermal runaway |
| Leakage Current | 1 µA at 25 °C - ensures minimal standby power loss in always-on vehicle modules |
| Junction Temperature | −55 to +175 °C - enables placement near hot engine compartments or power electronics |
| Dynamic Impedance | 89 mΩ - determines VCL rise slope under fast-rising transients (VCL = RD × IPP + VBR(max)) |
| Stand-off Voltage | 70 V - maximum continuous reverse operating voltage before significant leakage onset |
Pinout & Package
Supplied in JEDEC-registered D²PAK (TO-263AB) package with exposed copper drain pad for enhanced thermal dissipation. The device has two terminals: Cathode (pin 1, marked side) and Anode (pins 2 & 3, internally tied).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked side) | Surge current sink | Connected to protected line (e.g., battery rail); conducts transient energy to ground when VIN exceeds VBR |
| Anode (pins 2 & 3) | Common reference node | Internally shorted; must be connected to system ground plane for low-inductance return path and optimal thermal conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood use including temperature cycling, HTRB, and ESD stress per JESD22-A114 |
| UL 94 V0 resin housing | Self-extinguishing epoxy prevents fire propagation in high-energy fault conditions |
| Low αT (10.5 × 10−4/°C) | Minimizes VBR drift over temperature-critical for consistent protection margin in wide ambient ranges |
| 0.24 °C/W Rth(j-c) | Enables >500 W steady-state power handling when mounted on ≥20 cm² 2-oz copper with thermal vias |
| 30 kV IEC 61000-4-2 rating | Guarantees robustness against human-body-model ESD events in assembly and service environments |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Interface |
|---|---|
Use Scenario: Protects microcontroller power supply from alternator load-dump spikes during battery disconnection. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor; clamps within 1 ns to limit voltage to <113 V. Use Value: Prevents damage to 5 V/3.3 V LDOs and MCU I/Os rated for ≤16 V absolute maximum, ensuring ASIL-B functional safety compliance. | Use Scenario: Shields LIN bus transceivers and door actuator drivers from ISO 16750-2 Test A surges during cold-cranking. IC Role / Device Role / Timing Role: Front-end protection element on 12 V supply line; absorbs 400 ms pulses up to +90 V with <1% derating at 175 °C. Use Value: Maintains communication integrity during cranking transients where supply dips to 6 V then surges to 15 V-no reset or data corruption observed. |
| ADAS Camera Power Rail | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Secures image sensor and ISP power domain against ISO 7637-2 Pulse 5b (contact discharge) in rear-view camera modules. IC Role / Device Role / Timing Role: Reverse-biased clamp parallel to DC-DC converter input; activates only during >70 V excursions. Use Value: Eliminates need for redundant overvoltage lockout ICs-reduces BOM count by one component while meeting UNECE R10 radiated immunity requirements. | Use Scenario: Guards gate driver ICs and MOSFETs in EPS motor inverters from load-dump energy reflected from long harness runs. IC Role / Device Role / Timing Role: High-power TVS mounted directly on motor controller PCB near connector; dissipates 771 W peak without solder joint fatigue. Use Value: Extends field life beyond 15 years by preventing cumulative degradation of SiC MOSFET gate oxides under repeated 100× pulse stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A | Lower peak power (400 W), higher VCL (137 V @ 32.4 A), SMA package (Rth(j-a) = 50 °C/W) | Not qualified to AEC-Q101; limited to cabin-grade infotainment, not underhood | Select only for cost-sensitive non-safety systems with lower surge energy budgets. |
| SMCJ85A-Q | AEC-Q101 qualified, same VBR range, but SMC package (Rth(j-c) = 0.35 °C/W), 600 W peak power | Lower thermal performance than D²PAK; requires larger copper area for equivalent cooling | Choose when board space is constrained but AEC-Q101 is mandatory and 771 W rating is not required. |
Compared with SMAJ85A and SMCJ85A-Q, the LDP01-82AY delivers superior thermal management and higher surge resilience due to its D²PAK footprint and 0.24 °C/W junction-to-case resistance-enabling reliable operation in high-temperature engine bay locations where alternatives risk thermal runaway under repetitive load-dump events.
Availability
LDP01-82AY is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS camera power supplies requiring stable component supply across automotive production lifecycles.
Supply support for LDP01-82AY 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.
The LDP01-xxAY series belongs to ST's Transil™ automotive TVS portfolio, engineered specifically for ISO 7637-2 and ISO 16750-2 load-dump suppression in 12 V/24 V vehicle architectures-with emphasis on high-temperature reliability and AEC-Q101 process validation.
FAQ
What is the maximum allowable mounting temperature for LDP01-82AY during reflow?
The LDP01-82AY D²PAK package supports lead-free reflow with a maximum peak temperature of 260 °C for 10 seconds, per JEDEC J-STD-020. Thermal profile must maintain ramp-up rate ≤3 °C/s and avoid exceeding 230 °C for more than 60 seconds to prevent internal delamination or bond wire lift.
Can LDP01-82AY be used in bidirectional configurations?
No-LDP01-82AY is a unidirectional TVS diode intended for reverse-biased operation on positive supply rails. For bidirectional protection (e.g., data lines), ST recommends the ESDCAN03-2BM or USBLC6-2SC6, which provide symmetrical ±30 kV ESD clamping.
How does the 10.5 × 10⁻⁴/°C voltage temperature coefficient affect design margin?
At 175 °C, VBR increases by +15.8 V versus 25 °C (ΔT = 150 °C), shifting from 77.8–86 V to 93.6–101.8 V. Designers must verify that protected ICs' absolute maximum ratings remain above this elevated VBR to ensure clamping remains active during hot-engine operation.
Is the D²PAK footprint compatible with automated optical inspection (AOI) systems?
Yes-the LDP01-82AY's D²PAK outline (per Figure 19) includes defined fiducials and solder mask clearance per IPC-7351B. Its exposed drain pad allows thermal via detection, and the 0.23 mm pin thickness tolerance supports standard AOI algorithms for solder joint voiding and bridging analysis.
LDP01-82AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Series:
- LDP01Y, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 35A
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
LDP01-82AY FAQ
1.How can I place an order for LDP01-82AY through Aetrix?
Please submit a Request for Quotation (RFQ) for LDP01-82AY 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 LDP01-82AY reliable?
The price and inventory of LDP01-82AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDP01-82AY is usually 5 days.
3.What payment methods are accepted for LDP01-82AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDP01-82AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDP01-82AY?
LDP01-82AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDP01-82AY 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 LDP01-82AY?
For technical support, including LDP01-82AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDP01-82AY requirements.
6.How does Aetrix verify that LDP01-82AY is sourced from the original manufacturer or authorized distributors?
All LDP01-82AY 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 LDP01-82AY meets industry standards.
7.What is the process for return or replacement of LDP01-82AY?
All LDP01-82AY units undergo pre-shipment inspection (PSI). If there is an issue with LDP01-82AY, 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 LDP01-82AY part is unused and in its original packaging.
Return procedure for LDP01-82AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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